Merge changes I91953608,I09b3ee97 into main

* changes:
  [RON] Inflate and bind Rich Ongoing Views
  [RON] Extract a RichOngoingContentModel from timer notifications for testing.

26 files changed, 1574 insertions, 89 deletions

diff --git a/packages/SystemUI/multivalentTests/src/com/android/systemui/statusbar/notification/row/ui/viewmodel/TimerViewModelTest.kt b/packages/SystemUI/multivalentTests/src/com/android/systemui/statusbar/notification/row/ui/viewmodel/TimerViewModelTest.kt
new file mode 100644
index 000000000000..5e87f4663d76
--- /dev/null
+++ b/packages/SystemUI/multivalentTests/src/com/android/systemui/statusbar/notification/row/ui/viewmodel/TimerViewModelTest.kt
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+@file:OptIn(ExperimentalCoroutinesApi::class)
+
+package com.android.systemui.statusbar.notification.row.ui.viewmodel
+
+import android.app.PendingIntent
+import android.platform.test.annotations.EnableFlags
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.filters.SmallTest
+import com.android.systemui.SysuiTestCase
+import com.android.systemui.coroutines.collectLastValue
+import com.android.systemui.kosmos.testScope
+import com.android.systemui.statusbar.notification.row.data.repository.fakeNotificationRowRepository
+import com.android.systemui.statusbar.notification.row.shared.IconModel
+import com.android.systemui.statusbar.notification.row.shared.RichOngoingNotificationFlag
+import com.android.systemui.statusbar.notification.row.shared.TimerContentModel
+import com.android.systemui.statusbar.notification.row.shared.TimerContentModel.TimerState.Paused
+import com.android.systemui.testKosmos
+import com.google.common.truth.Truth.assertThat
+import java.time.Duration
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.runTest
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mockito.kotlin.mock
+
+@RunWith(AndroidJUnit4::class)
+@SmallTest
+@EnableFlags(RichOngoingNotificationFlag.FLAG_NAME)
+class TimerViewModelTest : SysuiTestCase() {
+    private val kosmos = testKosmos()
+    private val testScope = kosmos.testScope
+    private val repository = kosmos.fakeNotificationRowRepository
+
+    private var contentModel: TimerContentModel?
+        get() = repository.richOngoingContentModel.value as? TimerContentModel
+        set(value) {
+            repository.richOngoingContentModel.value = value
+        }
+
+    private lateinit var underTest: TimerViewModel
+
+    @Before
+    fun setup() {
+        underTest = kosmos.getTimerViewModel(repository)
+    }
+
+    @Test
+    fun labelShowsTheTimerName() =
+        testScope.runTest {
+            val label by collectLastValue(underTest.label)
+            contentModel = pausedTimer(name = "Example Timer Name")
+            assertThat(label).isEqualTo("Example Timer Name")
+        }
+
+    @Test
+    fun pausedTimeRemainingFormatsWell() =
+        testScope.runTest {
+            val label by collectLastValue(underTest.pausedTime)
+            contentModel = pausedTimer(timeRemaining = Duration.ofMinutes(3))
+            assertThat(label).isEqualTo("3:00")
+            contentModel = pausedTimer(timeRemaining = Duration.ofSeconds(119))
+            assertThat(label).isEqualTo("1:59")
+            contentModel = pausedTimer(timeRemaining = Duration.ofSeconds(121))
+            assertThat(label).isEqualTo("2:01")
+            contentModel = pausedTimer(timeRemaining = Duration.ofHours(1))
+            assertThat(label).isEqualTo("1:00:00")
+            contentModel = pausedTimer(timeRemaining = Duration.ofHours(24))
+            assertThat(label).isEqualTo("24:00:00")
+        }
+
+    private fun pausedTimer(
+        icon: IconModel = mock(),
+        name: String = "example",
+        timeRemaining: Duration = Duration.ofMinutes(3),
+        resumeIntent: PendingIntent? = null,
+        resetIntent: PendingIntent? = null
+    ) =
+        TimerContentModel(
+            icon = icon,
+            name = name,
+            state =
+                Paused(
+                    timeRemaining = timeRemaining,
+                    resumeIntent = resumeIntent,
+                    resetIntent = resetIntent,
+                )
+        )
+}
diff --git a/packages/SystemUI/res/layout/rich_ongoing_timer_notification.xml b/packages/SystemUI/res/layout/rich_ongoing_timer_notification.xml
new file mode 100644
index 000000000000..f2bfbe5c960d
--- /dev/null
+++ b/packages/SystemUI/res/layout/rich_ongoing_timer_notification.xml
@@ -0,0 +1,116 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2024 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License
+  -->
+<com.android.systemui.statusbar.notification.row.ui.view.TimerView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <androidx.constraintlayout.widget.Guideline
+        android:id="@+id/topBaseline"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        app:layout_constraintGuide_begin="22sp"
+        />
+
+    <ImageView
+        android:id="@+id/icon"
+        android:layout_width="24dp"
+        android:layout_height="24dp"
+        android:src="@drawable/ic_close"
+        app:tint="@android:color/white"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toStartOf="@id/label"
+        android:baseline="18dp"
+        app:layout_constraintBaseline_toTopOf="@id/topBaseline"
+        />
+    <TextView
+        android:id="@+id/label"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        app:layout_constraintStart_toEndOf="@id/icon"
+        app:layout_constraintEnd_toStartOf="@id/chronoRemaining"
+        android:singleLine="true"
+        tools:text="15s Timer"
+        app:layout_constraintBaseline_toTopOf="@id/topBaseline"
+        android:paddingEnd="4dp"
+        />
+    <Chronometer
+        android:id="@+id/chronoRemaining"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:singleLine="true"
+        android:textSize="20sp"
+        android:gravity="end"
+        tools:text="0:12"
+        app:layout_constraintBaseline_toTopOf="@id/topBaseline"
+        app:layout_constraintEnd_toStartOf="@id/pausedTimeRemaining"
+        app:layout_constraintStart_toEndOf="@id/label"
+        android:countDown="true"
+        android:paddingEnd="4dp"
+        />
+    <TextView
+        android:id="@+id/pausedTimeRemaining"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:singleLine="true"
+        android:textSize="20sp"
+        android:gravity="end"
+        tools:text="0:12"
+        app:layout_constraintBaseline_toTopOf="@id/topBaseline"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toEndOf="@id/chronoRemaining"
+        android:paddingEnd="4dp"
+        />
+
+    <androidx.constraintlayout.widget.Barrier
+        android:id="@+id/bottomOfTop"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        app:barrierDirection="bottom"
+        app:constraint_referenced_ids="icon,label,chronoRemaining,pausedTimeRemaining"
+        />
+
+    <com.android.systemui.statusbar.notification.row.ui.view.TimerButtonView
+        android:id="@+id/mainButton"
+        android:layout_width="124dp"
+        android:layout_height="wrap_content"
+        tools:text="Reset"
+        tools:drawableStart="@android:drawable/ic_menu_add"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toStartOf="@id/altButton"
+        app:layout_constraintTop_toBottomOf="@id/bottomOfTop"
+        app:layout_constraintHorizontal_chainStyle="spread"
+        android:paddingEnd="4dp"
+        />
+
+    <com.android.systemui.statusbar.notification.row.ui.view.TimerButtonView
+        android:id="@+id/altButton"
+        tools:text="Reset"
+        tools:drawableStart="@android:drawable/ic_menu_add"
+        android:drawablePadding="2dp"
+        android:drawableTint="@android:color/white"
+        android:layout_width="124dp"
+        android:layout_height="wrap_content"
+        app:layout_constraintTop_toBottomOf="@id/bottomOfTop"
+        app:layout_constraintStart_toEndOf="@id/mainButton"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:paddingEnd="4dp"
+        />
+</com.android.systemui.statusbar.notification.row.ui.view.TimerView>
\ No newline at end of file
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/collection/NotificationEntry.java b/packages/SystemUI/src/com/android/systemui/statusbar/notification/collection/NotificationEntry.java
index 1adfef061235..f98a88f5328b 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/collection/NotificationEntry.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/collection/NotificationEntry.java
@@ -68,9 +68,11 @@ import com.android.systemui.statusbar.notification.icon.IconPack;
 import com.android.systemui.statusbar.notification.row.ExpandableNotificationRow;
 import com.android.systemui.statusbar.notification.row.ExpandableNotificationRowController;
 import com.android.systemui.statusbar.notification.row.NotificationGuts;
+import com.android.systemui.statusbar.notification.row.data.repository.NotificationRowRepository;
 import com.android.systemui.statusbar.notification.row.shared.HeadsUpStatusBarModel;
 import com.android.systemui.statusbar.notification.row.shared.NotificationContentModel;
 import com.android.systemui.statusbar.notification.row.shared.NotificationRowContentBinderRefactor;
+import com.android.systemui.statusbar.notification.row.shared.RichOngoingContentModel;
 import com.android.systemui.statusbar.notification.stack.PriorityBucket;
 import com.android.systemui.util.ListenerSet;
 
@@ -97,7 +99,7 @@ import java.util.Objects;
  * At the moment, there are many things here that shouldn't be and vice-versa. Hopefully we can
  * clean this up in the future.
  */
-public final class NotificationEntry extends ListEntry {
+public final class NotificationEntry extends ListEntry implements NotificationRowRepository {
 
     private final String mKey;
     private StatusBarNotification mSbn;
@@ -159,6 +161,8 @@ public final class NotificationEntry extends ListEntry {
             StateFlowKt.MutableStateFlow(null);
     private final MutableStateFlow<CharSequence> mHeadsUpStatusBarTextPublic =
             StateFlowKt.MutableStateFlow(null);
+    private final MutableStateFlow<RichOngoingContentModel> mRichOngoingContentModel =
+            StateFlowKt.MutableStateFlow(null);
 
     // indicates when this entry's view was first attached to a window
     // this value will reset when the view is completely removed from the shade (ie: filtered out)
@@ -945,6 +949,7 @@ public final class NotificationEntry extends ListEntry {
     }
 
     /** @see #setHeadsUpStatusBarText(CharSequence) */
+    @NonNull
     public StateFlow<CharSequence> getHeadsUpStatusBarText() {
         return mHeadsUpStatusBarText;
     }
@@ -959,10 +964,17 @@ public final class NotificationEntry extends ListEntry {
     }
 
     /** @see #setHeadsUpStatusBarTextPublic(CharSequence) */
+    @NonNull
     public StateFlow<CharSequence> getHeadsUpStatusBarTextPublic() {
         return mHeadsUpStatusBarTextPublic;
     }
 
+    /** Gets the current RON content model, which may be null */
+    @NonNull
+    public StateFlow<RichOngoingContentModel> getRichOngoingContentModel() {
+        return mRichOngoingContentModel;
+    }
+
     /**
      * Sets the text to be displayed on the StatusBar, when this notification is the top pinned
      * heads up, and its content is sensitive right now.
@@ -1047,6 +1059,7 @@ public final class NotificationEntry extends ListEntry {
         HeadsUpStatusBarModel headsUpStatusBarModel = contentModel.getHeadsUpStatusBarModel();
         this.mHeadsUpStatusBarText.setValue(headsUpStatusBarModel.getPrivateText());
         this.mHeadsUpStatusBarTextPublic.setValue(headsUpStatusBarModel.getPublicText());
+        this.mRichOngoingContentModel.setValue(contentModel.getRichOngoingContentModel());
     }
 
     /** Information about a suggestion that is being edited. */
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/NotificationContentView.java b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/NotificationContentView.java
index 6f00d96b6312..7fc331d6adab 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/NotificationContentView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/NotificationContentView.java
@@ -72,6 +72,8 @@ import com.android.systemui.statusbar.policy.dagger.RemoteInputViewSubcomponent;
 import com.android.systemui.util.Compile;
 import com.android.systemui.util.DumpUtilsKt;
 
+import kotlinx.coroutines.DisposableHandle;
+
 import java.io.PrintWriter;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -109,6 +111,8 @@ public class NotificationContentView extends FrameLayout implements Notification
     private View mHeadsUpChild;
     private HybridNotificationView mSingleLineView;
 
+    @Nullable public DisposableHandle mContractedBinderHandle;
+
     private RemoteInputView mExpandedRemoteInput;
     private RemoteInputView mHeadsUpRemoteInput;
 
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/NotificationRowContentBinderImpl.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/NotificationRowContentBinderImpl.kt
index 5e08b0bc0c99..492d802c7cb2 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/NotificationRowContentBinderImpl.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/NotificationRowContentBinderImpl.kt
@@ -66,6 +66,7 @@ import com.android.systemui.statusbar.notification.row.shared.HeadsUpStatusBarMo
 import com.android.systemui.statusbar.notification.row.shared.NewRemoteViews
 import com.android.systemui.statusbar.notification.row.shared.NotificationContentModel
 import com.android.systemui.statusbar.notification.row.shared.NotificationRowContentBinderRefactor
+import com.android.systemui.statusbar.notification.row.shared.RichOngoingContentModel
 import com.android.systemui.statusbar.notification.row.ui.viewbinder.SingleLineConversationViewBinder
 import com.android.systemui.statusbar.notification.row.ui.viewbinder.SingleLineViewBinder
 import com.android.systemui.statusbar.notification.row.wrapper.NotificationViewWrapper
@@ -90,6 +91,8 @@ constructor(
     private val remoteViewCache: NotifRemoteViewCache,
     private val remoteInputManager: NotificationRemoteInputManager,
     private val conversationProcessor: ConversationNotificationProcessor,
+    private val ronExtractor: RichOngoingNotificationContentExtractor,
+    private val ronInflater: RichOngoingNotificationViewInflater,
     @NotifInflation private val inflationExecutor: Executor,
     private val smartReplyStateInflater: SmartReplyStateInflater,
     private val notifLayoutInflaterFactoryProvider: NotifLayoutInflaterFactory.Provider,
@@ -137,6 +140,8 @@ constructor(
                 remoteViewCache,
                 entry,
                 conversationProcessor,
+                ronExtractor,
+                ronInflater,
                 row,
                 bindParams.isMinimized,
                 bindParams.usesIncreasedHeight,
@@ -181,6 +186,7 @@ constructor(
                 notifLayoutInflaterFactoryProvider = notifLayoutInflaterFactoryProvider,
                 headsUpStyleProvider = headsUpStyleProvider,
                 conversationProcessor = conversationProcessor,
+                ronExtractor = ronExtractor,
                 logger = logger,
             )
         inflateSmartReplyViews(
@@ -260,6 +266,8 @@ constructor(
         when (inflateFlag) {
             FLAG_CONTENT_VIEW_CONTRACTED ->
                 row.privateLayout.performWhenContentInactive(VISIBLE_TYPE_CONTRACTED) {
+                    row.privateLayout.mContractedBinderHandle?.dispose()
+                    row.privateLayout.mContractedBinderHandle = null
                     row.privateLayout.setContractedChild(null)
                     remoteViewCache.removeCachedView(entry, FLAG_CONTENT_VIEW_CONTRACTED)
                 }
@@ -337,6 +345,8 @@ constructor(
         private val remoteViewCache: NotifRemoteViewCache,
         private val entry: NotificationEntry,
         private val conversationProcessor: ConversationNotificationProcessor,
+        private val ronExtractor: RichOngoingNotificationContentExtractor,
+        private val ronInflater: RichOngoingNotificationViewInflater,
         private val row: ExpandableNotificationRow,
         private val isMinimized: Boolean,
         private val usesIncreasedHeight: Boolean,
@@ -416,6 +426,7 @@ constructor(
                     notifLayoutInflaterFactoryProvider = notifLayoutInflaterFactoryProvider,
                     headsUpStyleProvider = headsUpStyleProvider,
                     conversationProcessor = conversationProcessor,
+                    ronExtractor = ronExtractor,
                     logger = logger
                 )
             logger.logAsyncTaskProgress(
@@ -447,6 +458,21 @@ constructor(
                         )
                     }
             }
+
+            if (reInflateFlags and CONTENT_VIEWS_TO_CREATE_RICH_ONGOING != 0) {
+                logger.logAsyncTaskProgress(entry, "inflating RON view")
+                inflationProgress.richOngoingNotificationViewHolder =
+                    inflationProgress.contentModel.richOngoingContentModel?.let {
+                        ronInflater.inflateView(
+                            contentModel = it,
+                            existingView = row.privateLayout.contractedChild,
+                            entry = entry,
+                            systemUiContext = context,
+                            parentView = row.privateLayout
+                        )
+                    }
+            }
+
             logger.logAsyncTaskProgress(entry, "getting row image resolver (on wrong thread!)")
             val imageResolver = row.imageResolver
             // wait for image resolver to finish preloading
@@ -552,6 +578,7 @@ constructor(
         var inflatedSmartReplyState: InflatedSmartReplyState? = null
         var expandedInflatedSmartReplies: InflatedSmartReplyViewHolder? = null
         var headsUpInflatedSmartReplies: InflatedSmartReplyViewHolder? = null
+        var richOngoingNotificationViewHolder: InflatedContentViewHolder? = null
 
         // Inflated SingleLineView that lacks the UI State
         var inflatedSingleLineView: HybridNotificationView? = null
@@ -586,6 +613,7 @@ constructor(
             val inflateHeadsUp =
                 (reInflateFlags and FLAG_CONTENT_VIEW_HEADS_UP != 0 &&
                     result.remoteViews.headsUp != null)
+
             if (inflateContracted || inflateExpanded || inflateHeadsUp) {
                 logger.logAsyncTaskProgress(entry, "inflating contracted smart reply state")
                 result.inflatedSmartReplyState = inflater.inflateSmartReplyState(entry)
@@ -627,6 +655,7 @@ constructor(
             notifLayoutInflaterFactoryProvider: NotifLayoutInflaterFactory.Provider,
             headsUpStyleProvider: HeadsUpStyleProvider,
             conversationProcessor: ConversationNotificationProcessor,
+            ronExtractor: RichOngoingNotificationContentExtractor,
             logger: NotificationRowContentBinderLogger
         ): InflationProgress {
             // process conversations and extract the messaging style
@@ -635,9 +664,24 @@ constructor(
                     conversationProcessor.processNotification(entry, builder, logger)
                 } else null
 
+            val richOngoingContentModel =
+                if (reInflateFlags and CONTENT_VIEWS_TO_CREATE_RICH_ONGOING != 0) {
+                    ronExtractor.extractContentModel(
+                        entry = entry,
+                        builder = builder,
+                        systemUIContext = systemUIContext,
+                        packageContext = packageContext
+                    )
+                } else {
+                    // if we're not re-inflating any RON views, make sure the model doesn't change
+                    entry.richOngoingContentModel.value
+                }
+
+            val remoteViewsFlags = getRemoteViewsFlags(reInflateFlags, richOngoingContentModel)
+
             val remoteViews =
                 createRemoteViews(
-                    reInflateFlags = reInflateFlags,
+                    reInflateFlags = remoteViewsFlags,
                     builder = builder,
                     isMinimized = isMinimized,
                     usesIncreasedHeight = usesIncreasedHeight,
@@ -672,6 +716,7 @@ constructor(
                 NotificationContentModel(
                     headsUpStatusBarModel = headsUpStatusBarModel,
                     singleLineViewModel = singleLineViewModel,
+                    richOngoingContentModel = richOngoingContentModel,
                 )
 
             return InflationProgress(
@@ -799,7 +844,7 @@ constructor(
             val publicLayout = row.publicLayout
             val runningInflations = HashMap<Int, CancellationSignal>()
             var flag = FLAG_CONTENT_VIEW_CONTRACTED
-            if (reInflateFlags and flag != 0) {
+            if (reInflateFlags and flag != 0 && result.remoteViews.contracted != null) {
                 val isNewView =
                     !canReapplyRemoteView(
                         newView = result.remoteViews.contracted,
@@ -813,7 +858,7 @@ constructor(
                         }
 
                         override val remoteView: RemoteViews
-                            get() = result.remoteViews.contracted!!
+                            get() = result.remoteViews.contracted
                     }
                 logger.logAsyncTaskProgress(entry, "applying contracted view")
                 applyRemoteView(
@@ -838,88 +883,82 @@ constructor(
                 )
             }
             flag = FLAG_CONTENT_VIEW_EXPANDED
-            if (reInflateFlags and flag != 0) {
-                if (result.remoteViews.expanded != null) {
-                    val isNewView =
-                        !canReapplyRemoteView(
-                            newView = result.remoteViews.expanded,
-                            oldView =
-                                remoteViewCache.getCachedView(entry, FLAG_CONTENT_VIEW_EXPANDED)
-                        )
-                    val applyCallback: ApplyCallback =
-                        object : ApplyCallback() {
-                            override fun setResultView(v: View) {
-                                logger.logAsyncTaskProgress(entry, "expanded view applied")
-                                result.inflatedExpandedView = v
-                            }
-
-                            override val remoteView: RemoteViews
-                                get() = result.remoteViews.expanded
-                        }
-                    logger.logAsyncTaskProgress(entry, "applying expanded view")
-                    applyRemoteView(
-                        inflationExecutor = inflationExecutor,
-                        inflateSynchronously = inflateSynchronously,
-                        isMinimized = isMinimized,
-                        result = result,
-                        reInflateFlags = reInflateFlags,
-                        inflationId = flag,
-                        remoteViewCache = remoteViewCache,
-                        entry = entry,
-                        row = row,
-                        isNewView = isNewView,
-                        remoteViewClickHandler = remoteViewClickHandler,
-                        callback = callback,
-                        parentLayout = privateLayout,
-                        existingView = privateLayout.expandedChild,
-                        existingWrapper = privateLayout.getVisibleWrapper(VISIBLE_TYPE_EXPANDED),
-                        runningInflations = runningInflations,
-                        applyCallback = applyCallback,
-                        logger = logger
+            if (reInflateFlags and flag != 0 && result.remoteViews.expanded != null) {
+                val isNewView =
+                    !canReapplyRemoteView(
+                        newView = result.remoteViews.expanded,
+                        oldView = remoteViewCache.getCachedView(entry, FLAG_CONTENT_VIEW_EXPANDED)
                     )
-                }
+                val applyCallback: ApplyCallback =
+                    object : ApplyCallback() {
+                        override fun setResultView(v: View) {
+                            logger.logAsyncTaskProgress(entry, "expanded view applied")
+                            result.inflatedExpandedView = v
+                        }
+
+                        override val remoteView: RemoteViews
+                            get() = result.remoteViews.expanded
+                    }
+                logger.logAsyncTaskProgress(entry, "applying expanded view")
+                applyRemoteView(
+                    inflationExecutor = inflationExecutor,
+                    inflateSynchronously = inflateSynchronously,
+                    isMinimized = isMinimized,
+                    result = result,
+                    reInflateFlags = reInflateFlags,
+                    inflationId = flag,
+                    remoteViewCache = remoteViewCache,
+                    entry = entry,
+                    row = row,
+                    isNewView = isNewView,
+                    remoteViewClickHandler = remoteViewClickHandler,
+                    callback = callback,
+                    parentLayout = privateLayout,
+                    existingView = privateLayout.expandedChild,
+                    existingWrapper = privateLayout.getVisibleWrapper(VISIBLE_TYPE_EXPANDED),
+                    runningInflations = runningInflations,
+                    applyCallback = applyCallback,
+                    logger = logger
+                )
             }
             flag = FLAG_CONTENT_VIEW_HEADS_UP
-            if (reInflateFlags and flag != 0) {
-                if (result.remoteViews.headsUp != null) {
-                    val isNewView =
-                        !canReapplyRemoteView(
-                            newView = result.remoteViews.headsUp,
-                            oldView =
-                                remoteViewCache.getCachedView(entry, FLAG_CONTENT_VIEW_HEADS_UP)
-                        )
-                    val applyCallback: ApplyCallback =
-                        object : ApplyCallback() {
-                            override fun setResultView(v: View) {
-                                logger.logAsyncTaskProgress(entry, "heads up view applied")
-                                result.inflatedHeadsUpView = v
-                            }
-
-                            override val remoteView: RemoteViews
-                                get() = result.remoteViews.headsUp
-                        }
-                    logger.logAsyncTaskProgress(entry, "applying heads up view")
-                    applyRemoteView(
-                        inflationExecutor = inflationExecutor,
-                        inflateSynchronously = inflateSynchronously,
-                        isMinimized = isMinimized,
-                        result = result,
-                        reInflateFlags = reInflateFlags,
-                        inflationId = flag,
-                        remoteViewCache = remoteViewCache,
-                        entry = entry,
-                        row = row,
-                        isNewView = isNewView,
-                        remoteViewClickHandler = remoteViewClickHandler,
-                        callback = callback,
-                        parentLayout = privateLayout,
-                        existingView = privateLayout.headsUpChild,
-                        existingWrapper = privateLayout.getVisibleWrapper(VISIBLE_TYPE_HEADSUP),
-                        runningInflations = runningInflations,
-                        applyCallback = applyCallback,
-                        logger = logger
+            if (reInflateFlags and flag != 0 && result.remoteViews.headsUp != null) {
+                val isNewView =
+                    !canReapplyRemoteView(
+                        newView = result.remoteViews.headsUp,
+                        oldView = remoteViewCache.getCachedView(entry, FLAG_CONTENT_VIEW_HEADS_UP)
                     )
-                }
+                val applyCallback: ApplyCallback =
+                    object : ApplyCallback() {
+                        override fun setResultView(v: View) {
+                            logger.logAsyncTaskProgress(entry, "heads up view applied")
+                            result.inflatedHeadsUpView = v
+                        }
+
+                        override val remoteView: RemoteViews
+                            get() = result.remoteViews.headsUp
+                    }
+                logger.logAsyncTaskProgress(entry, "applying heads up view")
+                applyRemoteView(
+                    inflationExecutor = inflationExecutor,
+                    inflateSynchronously = inflateSynchronously,
+                    isMinimized = isMinimized,
+                    result = result,
+                    reInflateFlags = reInflateFlags,
+                    inflationId = flag,
+                    remoteViewCache = remoteViewCache,
+                    entry = entry,
+                    row = row,
+                    isNewView = isNewView,
+                    remoteViewClickHandler = remoteViewClickHandler,
+                    callback = callback,
+                    parentLayout = privateLayout,
+                    existingView = privateLayout.headsUpChild,
+                    existingWrapper = privateLayout.getVisibleWrapper(VISIBLE_TYPE_HEADSUP),
+                    runningInflations = runningInflations,
+                    applyCallback = applyCallback,
+                    logger = logger
+                )
             }
             flag = FLAG_CONTENT_VIEW_PUBLIC
             if (reInflateFlags and flag != 0) {
@@ -1332,16 +1371,33 @@ constructor(
                 return false
             }
             logger.logAsyncTaskProgress(entry, "finishing")
-            setViewsFromRemoteViews(
-                reInflateFlags,
+
+            // before updating the content model, stop existing binding if necessary
+            val hasRichOngoingContentModel = result.contentModel.richOngoingContentModel != null
+            val requestedRichOngoing = reInflateFlags and CONTENT_VIEWS_TO_CREATE_RICH_ONGOING != 0
+            val rejectedRichOngoing = requestedRichOngoing && !hasRichOngoingContentModel
+            if (result.richOngoingNotificationViewHolder != null || rejectedRichOngoing) {
+                row.privateLayout.mContractedBinderHandle?.dispose()
+                row.privateLayout.mContractedBinderHandle = null
+            }
+
+            // set the content model after disposal and before setting new rich ongoing view
+            entry.setContentModel(result.contentModel)
+            result.inflatedSmartReplyState?.let { row.privateLayout.setInflatedSmartReplyState(it) }
+
+            // set normal remote views (skipping rich ongoing states when that model exists)
+            val remoteViewsFlags =
+                getRemoteViewsFlags(reInflateFlags, result.contentModel.richOngoingContentModel)
+            setContentViewsFromRemoteViews(
+                remoteViewsFlags,
                 entry,
                 remoteViewCache,
                 result,
                 row,
                 isMinimized,
             )
-            result.inflatedSmartReplyState?.let { row.privateLayout.setInflatedSmartReplyState(it) }
 
+            // set single line view
             if (
                 AsyncHybridViewInflation.isEnabled &&
                     reInflateFlags and FLAG_CONTENT_VIEW_SINGLE_LINE != 0
@@ -1357,14 +1413,29 @@ constructor(
                     row.privateLayout.setSingleLineView(result.inflatedSingleLineView)
                 }
             }
-            entry.setContentModel(result.contentModel)
+
+            // after updating the content model, set the view, then start the new binder
+            result.richOngoingNotificationViewHolder?.let { viewHolder ->
+                row.privateLayout.contractedChild = viewHolder.view
+                row.privateLayout.expandedChild = null
+                row.privateLayout.headsUpChild = null
+                row.privateLayout.setExpandedInflatedSmartReplies(null)
+                row.privateLayout.setHeadsUpInflatedSmartReplies(null)
+                row.privateLayout.mContractedBinderHandle =
+                    viewHolder.binder.setupContentViewBinder()
+                row.setExpandable(false)
+                remoteViewCache.removeCachedView(entry, FLAG_CONTENT_VIEW_CONTRACTED)
+                remoteViewCache.removeCachedView(entry, FLAG_CONTENT_VIEW_EXPANDED)
+                remoteViewCache.removeCachedView(entry, FLAG_CONTENT_VIEW_HEADS_UP)
+            }
+
             Trace.endAsyncSection(APPLY_TRACE_METHOD, System.identityHashCode(row))
             endListener?.onAsyncInflationFinished(entry)
             return true
         }
 
-        private fun setViewsFromRemoteViews(
-            reInflateFlags: Int,
+        private fun setContentViewsFromRemoteViews(
+            @InflationFlag reInflateFlags: Int,
             entry: NotificationEntry,
             remoteViewCache: NotifRemoteViewCache,
             result: InflationProgress,
@@ -1521,6 +1592,21 @@ constructor(
                     !oldView.hasFlags(RemoteViews.FLAG_REAPPLY_DISALLOWED)
         }
 
+        @InflationFlag
+        private fun getRemoteViewsFlags(
+            @InflationFlag reInflateFlags: Int,
+            richOngoingContentModel: RichOngoingContentModel?
+        ): Int =
+            if (richOngoingContentModel != null) {
+                reInflateFlags and CONTENT_VIEWS_TO_CREATE_RICH_ONGOING.inv()
+            } else {
+                reInflateFlags
+            }
+
+        @InflationFlag
+        private const val CONTENT_VIEWS_TO_CREATE_RICH_ONGOING =
+            FLAG_CONTENT_VIEW_CONTRACTED or FLAG_CONTENT_VIEW_EXPANDED or FLAG_CONTENT_VIEW_HEADS_UP
+
         private const val ASYNC_TASK_TRACE_METHOD =
             "NotificationRowContentBinderImpl.AsyncInflationTask"
         private const val APPLY_TRACE_METHOD = "NotificationRowContentBinderImpl#apply"
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/NotificationRowModule.java b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/NotificationRowModule.java
index 84f2f6670839..c630c4d43fba 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/NotificationRowModule.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/NotificationRowModule.java
@@ -18,6 +18,8 @@ package com.android.systemui.statusbar.notification.row;
 
 import com.android.systemui.dagger.SysUISingleton;
 import com.android.systemui.statusbar.notification.row.shared.NotificationRowContentBinderRefactor;
+import com.android.systemui.statusbar.notification.row.shared.RichOngoingNotificationFlag;
+import com.android.systemui.statusbar.notification.row.ui.viewmodel.RichOngoingViewModelComponent;
 
 import dagger.Binds;
 import dagger.Module;
@@ -28,7 +30,7 @@ import javax.inject.Provider;
 /**
  * Dagger Module containing notification row and view inflation implementations.
  */
-@Module
+@Module(subcomponents = {RichOngoingViewModelComponent.class})
 public abstract class NotificationRowModule {
 
     /**
@@ -47,6 +49,25 @@ public abstract class NotificationRowModule {
         }
     }
 
+    /** Provides ron content model extractor. */
+    @Provides
+    @SysUISingleton
+    public static RichOngoingNotificationContentExtractor provideRonContentExtractor(
+            Provider<RichOngoingNotificationContentExtractorImpl> realImpl
+    ) {
+        if (RichOngoingNotificationFlag.isEnabled()) {
+            return realImpl.get();
+        } else {
+            return new NoOpRichOngoingNotificationContentExtractor();
+        }
+    }
+
+    /** Provides ron view inflater. */
+    @Binds
+    @SysUISingleton
+    public abstract RichOngoingNotificationViewInflater provideRonViewInflater(
+            RichOngoingNotificationViewInflaterImpl impl);
+
     /**
      * Provides notification remote view cache instance.
      */
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/RichOngoingNotificationContentExtractor.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/RichOngoingNotificationContentExtractor.kt
new file mode 100644
index 000000000000..b5ea861c19a6
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/RichOngoingNotificationContentExtractor.kt
@@ -0,0 +1,170 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.notification.row
+
+import android.app.Notification
+import android.app.PendingIntent
+import android.content.Context
+import android.util.Log
+import com.android.systemui.dagger.SysUISingleton
+import com.android.systemui.statusbar.notification.collection.NotificationEntry
+import com.android.systemui.statusbar.notification.row.shared.IconModel
+import com.android.systemui.statusbar.notification.row.shared.RichOngoingContentModel
+import com.android.systemui.statusbar.notification.row.shared.RichOngoingNotificationFlag
+import com.android.systemui.statusbar.notification.row.shared.TimerContentModel
+import java.time.Duration
+import java.time.LocalDate
+import java.time.LocalDateTime
+import java.time.LocalTime
+import java.time.ZoneId
+import javax.inject.Inject
+
+/**
+ * Interface which provides a [RichOngoingContentModel] for a given [Notification] when one is
+ * applicable to the given style.
+ */
+interface RichOngoingNotificationContentExtractor {
+    fun extractContentModel(
+        entry: NotificationEntry,
+        builder: Notification.Builder,
+        systemUIContext: Context,
+        packageContext: Context
+    ): RichOngoingContentModel?
+}
+
+class NoOpRichOngoingNotificationContentExtractor : RichOngoingNotificationContentExtractor {
+    override fun extractContentModel(
+        entry: NotificationEntry,
+        builder: Notification.Builder,
+        systemUIContext: Context,
+        packageContext: Context
+    ): RichOngoingContentModel? = null
+}
+
+@SysUISingleton
+class RichOngoingNotificationContentExtractorImpl @Inject constructor() :
+    RichOngoingNotificationContentExtractor {
+
+    init {
+        /* check if */ RichOngoingNotificationFlag.isUnexpectedlyInLegacyMode()
+    }
+
+    override fun extractContentModel(
+        entry: NotificationEntry,
+        builder: Notification.Builder,
+        systemUIContext: Context,
+        packageContext: Context
+    ): RichOngoingContentModel? =
+        try {
+            val sbn = entry.sbn
+            val notification = sbn.notification
+            val icon = IconModel(notification.smallIcon)
+            if (sbn.packageName == "com.google.android.deskclock") {
+                when (notification.channelId) {
+                    "Timers v2" -> {
+                        parseTimerNotification(notification, icon)
+                    }
+                    "Stopwatch v2" -> {
+                        Log.i("RONs", "Can't process stopwatch yet")
+                        null
+                    }
+                    else -> {
+                        Log.i("RONs", "Can't process channel '${notification.channelId}'")
+                        null
+                    }
+                }
+            } else null
+        } catch (e: Exception) {
+            Log.e("RONs", "Error parsing RON", e)
+            null
+        }
+
+    /**
+     * FOR PROTOTYPING ONLY: create a RON TimerContentModel using the time information available
+     * inside the sortKey of the clock app's timer notifications.
+     */
+    private fun parseTimerNotification(
+        notification: Notification,
+        icon: IconModel
+    ): TimerContentModel {
+        // sortKey=1 0|↺7|RUNNING|▶16:21:58.523|Σ0:05:00|Δ0:00:03|⏳0:04:57
+        // sortKey=1 0|↺7|PAUSED|Σ0:05:00|Δ0:04:54|⏳0:00:06
+        // sortKey=1 1|↺7|RUNNING|▶16:30:28.433|Σ0:04:05|Δ0:00:06|⏳0:03:59
+        // sortKey=1 0|↺7|RUNNING|▶16:36:18.350|Σ0:05:00|Δ0:01:42|⏳0:03:18
+        // sortKey=1 2|↺7|RUNNING|▶16:38:37.816|Σ0:02:00|Δ0:01:09|⏳0:00:51
+        // ▶ = "current" time (when updated)
+        // Σ = total time
+        // Δ = time elapsed
+        // ⏳ = time remaining
+        val sortKey = notification.sortKey
+        val (_, _, state, extra) = sortKey.split("|", limit = 4)
+        return when (state) {
+            "PAUSED" -> {
+                val (total, _, remaining) = extra.split("|")
+                val timeRemaining = parseTimeDelta(remaining)
+                TimerContentModel(
+                    icon = icon,
+                    name = total,
+                    state =
+                        TimerContentModel.TimerState.Paused(
+                            timeRemaining = timeRemaining,
+                            resumeIntent = notification.findActionWithName("Resume"),
+                            resetIntent = notification.findActionWithName("Reset"),
+                        )
+                )
+            }
+            "RUNNING" -> {
+                val (current, total, _, remaining) = extra.split("|")
+                val finishTime = parseCurrentTime(current) + parseTimeDelta(remaining).toMillis()
+                TimerContentModel(
+                    icon = icon,
+                    name = total,
+                    state =
+                        TimerContentModel.TimerState.Running(
+                            finishTime = finishTime,
+                            pauseIntent = notification.findActionWithName("Pause"),
+                            addOneMinuteIntent = notification.findActionWithName("Add 1 min"),
+                        )
+                )
+            }
+            else -> error("unknown state ($state) in sortKey=$sortKey")
+        }
+    }
+
+    private fun Notification.findActionWithName(name: String): PendingIntent? {
+        return actions.firstOrNull { name == it.title?.toString() }?.actionIntent
+    }
+
+    private fun parseCurrentTime(current: String): Long {
+        val (hour, minute, second, millis) = current.replace("▶", "").split(":", ".")
+        // NOTE: this won't work correctly at/around midnight.  It's just for prototyping.
+        val localDateTime =
+            LocalDateTime.of(
+                LocalDate.now(),
+                LocalTime.of(hour.toInt(), minute.toInt(), second.toInt(), millis.toInt() * 1000000)
+            )
+        val offset = ZoneId.systemDefault().rules.getOffset(localDateTime)
+        return localDateTime.toInstant(offset).toEpochMilli()
+    }
+
+    private fun parseTimeDelta(delta: String): Duration {
+        val (hour, minute, second) = delta.replace("Σ", "").replace("⏳", "").split(":")
+        return Duration.ofHours(hour.toLong())
+            .plusMinutes(minute.toLong())
+            .plusSeconds(second.toLong())
+    }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/RichOngoingNotificationViewInflater.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/RichOngoingNotificationViewInflater.kt
new file mode 100644
index 000000000000..e9c4960a4011
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/RichOngoingNotificationViewInflater.kt
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.notification.row
+
+import android.app.Notification
+import android.content.Context
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import com.android.systemui.dagger.SysUISingleton
+import com.android.systemui.res.R
+import com.android.systemui.statusbar.notification.collection.NotificationEntry
+import com.android.systemui.statusbar.notification.row.shared.RichOngoingContentModel
+import com.android.systemui.statusbar.notification.row.shared.RichOngoingNotificationFlag
+import com.android.systemui.statusbar.notification.row.shared.StopwatchContentModel
+import com.android.systemui.statusbar.notification.row.shared.TimerContentModel
+import com.android.systemui.statusbar.notification.row.ui.view.TimerView
+import com.android.systemui.statusbar.notification.row.ui.viewbinder.TimerViewBinder
+import com.android.systemui.statusbar.notification.row.ui.viewmodel.RichOngoingViewModelComponent
+import com.android.systemui.statusbar.notification.row.ui.viewmodel.TimerViewModel
+import javax.inject.Inject
+import kotlinx.coroutines.DisposableHandle
+
+fun interface DeferredContentViewBinder {
+    fun setupContentViewBinder(): DisposableHandle
+}
+
+class InflatedContentViewHolder(val view: View, val binder: DeferredContentViewBinder)
+
+/**
+ * Interface which provides a [RichOngoingContentModel] for a given [Notification] when one is
+ * applicable to the given style.
+ */
+interface RichOngoingNotificationViewInflater {
+    fun inflateView(
+        contentModel: RichOngoingContentModel,
+        existingView: View?,
+        entry: NotificationEntry,
+        systemUiContext: Context,
+        parentView: ViewGroup,
+    ): InflatedContentViewHolder?
+}
+
+@SysUISingleton
+class RichOngoingNotificationViewInflaterImpl
+@Inject
+constructor(
+    private val viewModelComponentFactory: RichOngoingViewModelComponent.Factory,
+) : RichOngoingNotificationViewInflater {
+
+    override fun inflateView(
+        contentModel: RichOngoingContentModel,
+        existingView: View?,
+        entry: NotificationEntry,
+        systemUiContext: Context,
+        parentView: ViewGroup,
+    ): InflatedContentViewHolder? {
+        if (RichOngoingNotificationFlag.isUnexpectedlyInLegacyMode()) return null
+        val component = viewModelComponentFactory.create(entry)
+        return when (contentModel) {
+            is TimerContentModel ->
+                inflateTimerView(
+                    existingView,
+                    component::createTimerViewModel,
+                    systemUiContext,
+                    parentView
+                )
+            is StopwatchContentModel -> TODO("Not yet implemented")
+        }
+    }
+
+    private fun inflateTimerView(
+        existingView: View?,
+        createViewModel: () -> TimerViewModel,
+        systemUiContext: Context,
+        parentView: ViewGroup,
+    ): InflatedContentViewHolder? {
+        if (existingView is TimerView && !existingView.isReinflateNeeded()) return null
+        val newView =
+            LayoutInflater.from(systemUiContext)
+                .inflate(
+                    R.layout.rich_ongoing_timer_notification,
+                    parentView,
+                    /* attachToRoot= */ false
+                ) as TimerView
+        return InflatedContentViewHolder(newView) {
+            TimerViewBinder.bindWhileAttached(newView, createViewModel())
+        }
+    }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/data/repository/NotificationRowRepository.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/data/repository/NotificationRowRepository.kt
new file mode 100644
index 000000000000..bac887ba7f14
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/data/repository/NotificationRowRepository.kt
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.notification.row.data.repository
+
+import com.android.systemui.statusbar.notification.row.shared.RichOngoingContentModel
+import kotlinx.coroutines.flow.StateFlow
+
+/** A repository of states relating to a specific notification row. */
+interface NotificationRowRepository {
+    /**
+     * A flow of an immutable data class with the current state of the Rich Ongoing Notification
+     * content, if applicable.
+     */
+    val richOngoingContentModel: StateFlow<RichOngoingContentModel?>
+}
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/domain/interactor/NotificationRowInteractor.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/domain/interactor/NotificationRowInteractor.kt
new file mode 100644
index 000000000000..4705ace7fac6
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/domain/interactor/NotificationRowInteractor.kt
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the
+ * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ *
+ */
+
+package com.android.systemui.statusbar.notification.row.domain.interactor
+
+import com.android.systemui.statusbar.notification.row.data.repository.NotificationRowRepository
+import com.android.systemui.statusbar.notification.row.shared.TimerContentModel
+import javax.inject.Inject
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.filterIsInstance
+
+/** Interactor specific to a particular notification row. */
+class NotificationRowInteractor @Inject constructor(repository: NotificationRowRepository) {
+    /** Content of a rich ongoing timer notification. */
+    val timerContentModel: Flow<TimerContentModel> =
+        repository.richOngoingContentModel.filterIsInstance<TimerContentModel>()
+}
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/shared/IconModel.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/shared/IconModel.kt
new file mode 100644
index 000000000000..e61193892d10
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/shared/IconModel.kt
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.notification.row.shared
+
+import android.graphics.drawable.Drawable
+import android.graphics.drawable.Icon
+
+// TODO: figure out how to support lazy resolution of the drawable, e.g. on unrelated text change
+class IconModel(val icon: Icon) {
+    var drawable: Drawable? = null
+
+    override fun equals(other: Any?): Boolean =
+        when (other) {
+            null -> false
+            (other === this) -> true
+            !is IconModel -> false
+            else -> other.icon.sameAs(icon)
+        }
+
+    override fun toString(): String = "IconModel(icon=$icon, drawable=$drawable)"
+}
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/shared/NotificationContentModel.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/shared/NotificationContentModel.kt
index b2421bc72d00..46010a1ab43d 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/shared/NotificationContentModel.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/shared/NotificationContentModel.kt
@@ -21,4 +21,7 @@ import com.android.systemui.statusbar.notification.row.ui.viewmodel.SingleLineVi
 data class NotificationContentModel(
     val headsUpStatusBarModel: HeadsUpStatusBarModel,
     val singleLineViewModel: SingleLineViewModel? = null,
+    val richOngoingContentModel: RichOngoingContentModel? = null,
 )
+
+sealed interface RichOngoingContentModel
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/shared/RichOngoingClock.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/shared/RichOngoingClock.kt
new file mode 100644
index 000000000000..558470175e8d
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/shared/RichOngoingClock.kt
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.notification.row.shared
+
+import android.app.PendingIntent
+import java.time.Duration
+
+/**
+ * Represents a simple timer that counts down to a time.
+ *
+ * @param name the label for the timer
+ * @param state state of the timer, including time and whether it is paused or running
+ */
+data class TimerContentModel(
+    val icon: IconModel,
+    val name: String,
+    val state: TimerState,
+) : RichOngoingContentModel {
+    /** The state (paused or running) of the timer, and relevant time */
+    sealed interface TimerState {
+        /**
+         * Indicates a running timer
+         *
+         * @param finishTime the time in ms since epoch that the timer will finish
+         * @param pauseIntent the action for pausing the timer
+         */
+        data class Running(
+            val finishTime: Long,
+            val pauseIntent: PendingIntent?,
+            val addOneMinuteIntent: PendingIntent?,
+        ) : TimerState
+
+        /**
+         * Indicates a paused timer
+         *
+         * @param timeRemaining the time in ms remaining on the paused timer
+         * @param resumeIntent the action for resuming the timer
+         */
+        data class Paused(
+            val timeRemaining: Duration,
+            val resumeIntent: PendingIntent?,
+            val resetIntent: PendingIntent?,
+        ) : TimerState
+    }
+}
+
+/**
+ * Represents a simple stopwatch that counts up and allows tracking laps.
+ *
+ * @param state state of the stopwatch, including time and whether it is paused or running
+ * @param lapDurations a list of durations of each completed lap
+ */
+data class StopwatchContentModel(
+    val icon: IconModel,
+    val state: StopwatchState,
+    val lapDurations: List<Long>,
+) : RichOngoingContentModel {
+    /** The state (paused or running) of the stopwatch, and relevant time */
+    sealed interface StopwatchState {
+        /**
+         * Indicates a running stopwatch
+         *
+         * @param startTime the time in ms since epoch that the stopwatch started, plus any
+         *   accumulated pause time
+         * @param pauseIntent the action for pausing the stopwatch
+         */
+        data class Running(
+            val startTime: Long,
+            val pauseIntent: PendingIntent,
+        ) : StopwatchState
+
+        /**
+         * Indicates a paused stopwatch
+         *
+         * @param timeElapsed the time in ms elapsed on the stopwatch
+         * @param resumeIntent the action for resuming the stopwatch
+         */
+        data class Paused(
+            val timeElapsed: Duration,
+            val resumeIntent: PendingIntent,
+        ) : StopwatchState
+    }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/shared/RichOngoingNotificationFlag.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/shared/RichOngoingNotificationFlag.kt
new file mode 100644
index 000000000000..4a7f7cd46ad1
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/shared/RichOngoingNotificationFlag.kt
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.notification.row.shared
+
+import android.app.Flags
+import com.android.systemui.flags.FlagToken
+import com.android.systemui.flags.RefactorFlagUtils
+
+/** Helper for reading or using the api rich ongoing flag state. */
+@Suppress("NOTHING_TO_INLINE")
+object RichOngoingNotificationFlag {
+    /** The aconfig flag name */
+    const val FLAG_NAME = Flags.FLAG_API_RICH_ONGOING
+
+    /** A token used for dependency declaration */
+    val token: FlagToken
+        get() = FlagToken(FLAG_NAME, isEnabled)
+
+    /** Is the refactor enabled */
+    @JvmStatic
+    inline val isEnabled
+        get() = Flags.apiRichOngoing()
+
+    /**
+     * Called to ensure code is only run when the flag is enabled. This protects users from the
+     * unintended behaviors caused by accidentally running new logic, while also crashing on an eng
+     * build to ensure that the refactor author catches issues in testing.
+     */
+    @JvmStatic
+    inline fun isUnexpectedlyInLegacyMode() =
+        RefactorFlagUtils.isUnexpectedlyInLegacyMode(isEnabled, FLAG_NAME)
+
+    /**
+     * Called to ensure code is only run when the flag is disabled. This will throw an exception if
+     * the flag is enabled to ensure that the refactor author catches issues in testing.
+     */
+    @JvmStatic
+    inline fun assertInLegacyMode() = RefactorFlagUtils.assertInLegacyMode(isEnabled, FLAG_NAME)
+}
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/view/ConfigurationTracker.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/view/ConfigurationTracker.kt
new file mode 100644
index 000000000000..95c507cb72a2
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/view/ConfigurationTracker.kt
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.notification.row.ui.view
+
+import android.content.pm.ActivityInfo.CONFIG_ASSETS_PATHS
+import android.content.pm.ActivityInfo.CONFIG_DENSITY
+import android.content.pm.ActivityInfo.CONFIG_FONT_SCALE
+import android.content.pm.ActivityInfo.CONFIG_LAYOUT_DIRECTION
+import android.content.pm.ActivityInfo.CONFIG_LOCALE
+import android.content.pm.ActivityInfo.CONFIG_UI_MODE
+import android.content.res.Configuration
+import android.content.res.Resources
+
+/**
+ * Tracks the active configuration when constructed and returns (when queried) whether the
+ * configuration has unhandled changes.
+ */
+class ConfigurationTracker(
+    private val resources: Resources,
+    private val unhandledConfigChanges: Int
+) {
+    private val initialConfig = Configuration(resources.configuration)
+
+    constructor(
+        resources: Resources,
+        handlesDensityFontScale: Boolean = false,
+        handlesTheme: Boolean = false,
+        handlesLocaleAndLayout: Boolean = true,
+    ) : this(
+        resources,
+        unhandledConfigChanges =
+            (if (handlesDensityFontScale) 0 else CONFIG_DENSITY or CONFIG_FONT_SCALE) or
+                (if (handlesTheme) 0 else CONFIG_ASSETS_PATHS or CONFIG_UI_MODE) or
+                (if (handlesLocaleAndLayout) 0 else CONFIG_LOCALE or CONFIG_LAYOUT_DIRECTION)
+    )
+
+    /**
+     * Whether the current configuration has unhandled changes relative to the initial configuration
+     */
+    fun hasUnhandledConfigChange(): Boolean =
+        initialConfig.diff(resources.configuration) and unhandledConfigChanges != 0
+}
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/view/TimerButtonView.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/view/TimerButtonView.kt
new file mode 100644
index 000000000000..0d83aced6d07
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/view/TimerButtonView.kt
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.notification.row.ui.view
+
+import android.annotation.DrawableRes
+import android.content.Context
+import android.util.AttributeSet
+import android.widget.Button
+
+class TimerButtonView
+@JvmOverloads
+constructor(
+    context: Context,
+    attrs: AttributeSet? = null,
+    defStyleAttr: Int = 0,
+    defStyleRes: Int = 0,
+) : Button(context, attrs, defStyleAttr, defStyleRes) {
+
+    private val Int.dp: Int
+        get() = (this * context.resources.displayMetrics.density).toInt()
+
+    fun setIcon(@DrawableRes icon: Int) {
+        val drawable = context.getDrawable(icon)
+        drawable?.setBounds(0, 0, 24.dp, 24.dp)
+        setCompoundDrawablesRelative(drawable, null, null, null)
+    }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/view/TimerView.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/view/TimerView.kt
new file mode 100644
index 000000000000..2e164d60431d
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/view/TimerView.kt
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.notification.row.ui.view
+
+import android.content.Context
+import android.graphics.drawable.Drawable
+import android.os.SystemClock
+import android.util.AttributeSet
+import android.widget.Chronometer
+import android.widget.ImageView
+import android.widget.TextView
+import androidx.constraintlayout.widget.ConstraintLayout
+import androidx.core.view.isVisible
+import com.android.systemui.res.R
+
+class TimerView
+@JvmOverloads
+constructor(
+    context: Context,
+    attrs: AttributeSet? = null,
+    defStyleAttr: Int = 0,
+    defStyleRes: Int = 0,
+) : ConstraintLayout(context, attrs, defStyleAttr, defStyleRes) {
+
+    private val configTracker = ConfigurationTracker(resources)
+
+    private lateinit var icon: ImageView
+    private lateinit var label: TextView
+    private lateinit var chronometer: Chronometer
+    private lateinit var pausedTimeRemaining: TextView
+    lateinit var mainButton: TimerButtonView
+        private set
+
+    lateinit var altButton: TimerButtonView
+        private set
+
+    override fun onFinishInflate() {
+        super.onFinishInflate()
+        icon = requireViewById(R.id.icon)
+        label = requireViewById(R.id.label)
+        chronometer = requireViewById(R.id.chronoRemaining)
+        pausedTimeRemaining = requireViewById(R.id.pausedTimeRemaining)
+        mainButton = requireViewById(R.id.mainButton)
+        altButton = requireViewById(R.id.altButton)
+    }
+
+    /** the resources configuration has changed such that the view needs to be reinflated */
+    fun isReinflateNeeded(): Boolean = configTracker.hasUnhandledConfigChange()
+
+    fun setIcon(iconDrawable: Drawable?) {
+        this.icon.setImageDrawable(iconDrawable)
+    }
+
+    fun setLabel(label: String) {
+        this.label.text = label
+    }
+
+    fun setPausedTime(pausedTime: String?) {
+        if (pausedTime != null) {
+            pausedTimeRemaining.text = pausedTime
+            pausedTimeRemaining.isVisible = true
+        } else {
+            pausedTimeRemaining.isVisible = false
+        }
+    }
+
+    fun setCountdownTime(countdownTimeMs: Long?) {
+        if (countdownTimeMs != null) {
+            chronometer.base =
+                countdownTimeMs - System.currentTimeMillis() + SystemClock.elapsedRealtime()
+            chronometer.isVisible = true
+            chronometer.start()
+        } else {
+            chronometer.isVisible = false
+            chronometer.stop()
+        }
+    }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/viewbinder/TimerViewBinder.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/viewbinder/TimerViewBinder.kt
new file mode 100644
index 000000000000..c9ff58961582
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/viewbinder/TimerViewBinder.kt
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.notification.row.ui.viewbinder
+
+import android.view.View
+import androidx.core.view.isGone
+import androidx.lifecycle.lifecycleScope
+import com.android.systemui.lifecycle.repeatWhenAttached
+import com.android.systemui.statusbar.notification.row.ui.view.TimerButtonView
+import com.android.systemui.statusbar.notification.row.ui.view.TimerView
+import com.android.systemui.statusbar.notification.row.ui.viewmodel.TimerViewModel
+import kotlinx.coroutines.DisposableHandle
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.launch
+
+/** Binds a [TimerView] to its [view model][TimerViewModel]. */
+object TimerViewBinder {
+    fun bindWhileAttached(
+        view: TimerView,
+        viewModel: TimerViewModel,
+    ): DisposableHandle {
+        return view.repeatWhenAttached { lifecycleScope.launch { bind(view, viewModel) } }
+    }
+
+    suspend fun bind(
+        view: TimerView,
+        viewModel: TimerViewModel,
+    ) = coroutineScope {
+        launch { viewModel.icon.collect { view.setIcon(it) } }
+        launch { viewModel.label.collect { view.setLabel(it) } }
+        launch { viewModel.pausedTime.collect { view.setPausedTime(it) } }
+        launch { viewModel.countdownTime.collect { view.setCountdownTime(it) } }
+        launch { viewModel.mainButtonModel.collect { bind(view.mainButton, it) } }
+        launch { viewModel.altButtonModel.collect { bind(view.altButton, it) } }
+    }
+
+    fun bind(buttonView: TimerButtonView, model: TimerViewModel.ButtonViewModel?) {
+        if (model != null) {
+            buttonView.setIcon(model.iconRes)
+            buttonView.setText(model.labelRes)
+            buttonView.setOnClickListener(
+                model.pendingIntent?.let { pendingIntent ->
+                    View.OnClickListener { pendingIntent.send() }
+                }
+            )
+            buttonView.isEnabled = model.pendingIntent != null
+        }
+        buttonView.isGone = model == null
+    }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/viewmodel/RichOngoingViewModelComponent.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/viewmodel/RichOngoingViewModelComponent.kt
new file mode 100644
index 000000000000..dad52a3b2c45
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/viewmodel/RichOngoingViewModelComponent.kt
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.notification.row.ui.viewmodel
+
+// noinspection CleanArchitectureDependencyViolation
+import com.android.systemui.statusbar.notification.row.data.repository.NotificationRowRepository
+import dagger.BindsInstance
+import dagger.Subcomponent
+
+@Subcomponent
+interface RichOngoingViewModelComponent {
+
+    @Subcomponent.Factory
+    interface Factory {
+        /** Creates an instance of [RichOngoingViewModelComponent]. */
+        fun create(
+            @BindsInstance repository: NotificationRowRepository
+        ): RichOngoingViewModelComponent
+    }
+
+    fun createTimerViewModel(): TimerViewModel
+}
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/viewmodel/TimerViewModel.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/viewmodel/TimerViewModel.kt
new file mode 100644
index 000000000000..a85c87f288d3
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ui/viewmodel/TimerViewModel.kt
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.notification.row.ui.viewmodel
+
+import android.annotation.DrawableRes
+import android.annotation.StringRes
+import android.app.PendingIntent
+import android.graphics.drawable.Drawable
+import com.android.systemui.dump.DumpManager
+import com.android.systemui.statusbar.notification.row.domain.interactor.NotificationRowInteractor
+import com.android.systemui.statusbar.notification.row.shared.RichOngoingNotificationFlag
+import com.android.systemui.statusbar.notification.row.shared.TimerContentModel.TimerState
+import com.android.systemui.util.kotlin.FlowDumperImpl
+import java.time.Duration
+import javax.inject.Inject
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.mapNotNull
+
+/** A view model for Timer notifications. */
+class TimerViewModel
+@Inject
+constructor(
+    dumpManager: DumpManager,
+    rowInteractor: NotificationRowInteractor,
+) : FlowDumperImpl(dumpManager) {
+    init {
+        /* check if */ RichOngoingNotificationFlag.isUnexpectedlyInLegacyMode()
+    }
+
+    private val state: Flow<TimerState> = rowInteractor.timerContentModel.mapNotNull { it.state }
+
+    val icon: Flow<Drawable?> = rowInteractor.timerContentModel.mapNotNull { it.icon.drawable }
+
+    val label: Flow<String> = rowInteractor.timerContentModel.mapNotNull { it.name }
+
+    val countdownTime: Flow<Long?> = state.map { (it as? TimerState.Running)?.finishTime }
+
+    val pausedTime: Flow<String?> =
+        state.map { (it as? TimerState.Paused)?.timeRemaining?.format() }
+
+    val mainButtonModel: Flow<ButtonViewModel> =
+        state.map {
+            when (it) {
+                is TimerState.Paused ->
+                    ButtonViewModel(
+                        it.resumeIntent,
+                        com.android.systemui.res.R.string.controls_media_resume, // "Resume",
+                        com.android.systemui.res.R.drawable.ic_media_play
+                    )
+                is TimerState.Running ->
+                    ButtonViewModel(
+                        it.pauseIntent,
+                        com.android.systemui.res.R.string.controls_media_button_pause, // "Pause",
+                        com.android.systemui.res.R.drawable.ic_media_pause
+                    )
+            }
+        }
+
+    val altButtonModel: Flow<ButtonViewModel?> =
+        state.map {
+            when (it) {
+                is TimerState.Paused ->
+                    it.resetIntent?.let { resetIntent ->
+                        ButtonViewModel(
+                            resetIntent,
+                            com.android.systemui.res.R.string.reset, // "Reset",
+                            com.android.systemui.res.R.drawable.ic_close_white_rounded
+                        )
+                    }
+                is TimerState.Running ->
+                    it.addOneMinuteIntent?.let { addOneMinuteIntent ->
+                        ButtonViewModel(
+                            addOneMinuteIntent,
+                            com.android.systemui.res.R.string.add, // "Add 1 minute",
+                            com.android.systemui.res.R.drawable.ic_add
+                        )
+                    }
+            }
+        }
+
+    data class ButtonViewModel(
+        val pendingIntent: PendingIntent?,
+        @StringRes val labelRes: Int,
+        @DrawableRes val iconRes: Int,
+    )
+}
+
+private fun Duration.format(): String {
+    val hours = this.toHours()
+    return if (hours > 0) {
+        String.format("%d:%02d:%02d", hours, toMinutesPart(), toSecondsPart())
+    } else {
+        String.format("%d:%02d", toMinutes(), toSecondsPart())
+    }
+}
diff --git a/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/row/NotificationRowContentBinderImplTest.kt b/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/row/NotificationRowContentBinderImplTest.kt
index ff0abf651895..54a26f722d7f 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/row/NotificationRowContentBinderImplTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/row/NotificationRowContentBinderImplTest.kt
@@ -45,20 +45,29 @@ import com.android.systemui.statusbar.notification.row.shared.HeadsUpStatusBarMo
 import com.android.systemui.statusbar.notification.row.shared.NewRemoteViews
 import com.android.systemui.statusbar.notification.row.shared.NotificationContentModel
 import com.android.systemui.statusbar.notification.row.shared.NotificationRowContentBinderRefactor
+import com.android.systemui.statusbar.notification.row.shared.RichOngoingContentModel
+import com.android.systemui.statusbar.notification.row.shared.TimerContentModel
 import com.android.systemui.statusbar.policy.InflatedSmartReplyState
 import com.android.systemui.statusbar.policy.InflatedSmartReplyViewHolder
 import com.android.systemui.statusbar.policy.SmartReplyStateInflater
+import com.google.common.truth.Truth.assertThat
 import java.util.concurrent.CountDownLatch
 import java.util.concurrent.Executor
 import java.util.concurrent.TimeUnit
+import kotlinx.coroutines.DisposableHandle
 import org.junit.Assert
 import org.junit.Before
 import org.junit.Ignore
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.mockito.kotlin.any
+import org.mockito.kotlin.argThat
+import org.mockito.kotlin.clearInvocations
+import org.mockito.kotlin.doReturn
 import org.mockito.kotlin.eq
+import org.mockito.kotlin.inOrder
 import org.mockito.kotlin.mock
+import org.mockito.kotlin.never
 import org.mockito.kotlin.spy
 import org.mockito.kotlin.times
 import org.mockito.kotlin.verify
@@ -102,6 +111,31 @@ class NotificationRowContentBinderImplTest : SysuiTestCase() {
             }
         }
 
+    private var fakeRonContentModel: RichOngoingContentModel? = null
+    private val fakeRonExtractor =
+        object : RichOngoingNotificationContentExtractor {
+            override fun extractContentModel(
+                entry: NotificationEntry,
+                builder: Notification.Builder,
+                systemUIContext: Context,
+                packageContext: Context
+            ): RichOngoingContentModel? = fakeRonContentModel
+        }
+
+    private var fakeRonViewHolder: InflatedContentViewHolder? = null
+    private val fakeRonViewInflater =
+        spy(
+            object : RichOngoingNotificationViewInflater {
+                override fun inflateView(
+                    contentModel: RichOngoingContentModel,
+                    existingView: View?,
+                    entry: NotificationEntry,
+                    systemUiContext: Context,
+                    parentView: ViewGroup
+                ): InflatedContentViewHolder? = fakeRonViewHolder
+            }
+        )
+
     @Before
     fun setUp() {
         allowTestableLooperAsMainThread()
@@ -118,6 +152,8 @@ class NotificationRowContentBinderImplTest : SysuiTestCase() {
                 cache,
                 mock(),
                 mock<ConversationNotificationProcessor>(),
+                fakeRonExtractor,
+                fakeRonViewInflater,
                 mock(),
                 smartReplyStateInflater,
                 layoutInflaterFactoryProvider,
@@ -347,6 +383,108 @@ class NotificationRowContentBinderImplTest : SysuiTestCase() {
     }
 
     @Test
+    fun testRonModelRequiredForRonView() {
+        fakeRonContentModel = null
+        val ronView = View(context)
+        fakeRonViewHolder = InflatedContentViewHolder(view = ronView, binder = mock())
+        // WHEN inflater inflates
+        inflateAndWait(notificationInflater, FLAG_CONTENT_VIEW_CONTRACTED, row)
+        verify(fakeRonViewInflater, never()).inflateView(any(), any(), any(), any(), any())
+    }
+
+    @Test
+    fun testRonModelTriggersInflationOfRonView() {
+        val mockRonModel = mock<TimerContentModel>()
+        val ronView = View(context)
+        val mockBinder = mock<DeferredContentViewBinder>()
+
+        val entry = row.entry
+        val privateLayout = row.privateLayout
+
+        fakeRonContentModel = mockRonModel
+        fakeRonViewHolder = InflatedContentViewHolder(view = ronView, binder = mockBinder)
+        // WHEN inflater inflates
+        inflateAndWait(notificationInflater, FLAG_CONTENT_VIEW_CONTRACTED, row)
+        // VERIFY that the inflater is invoked
+        verify(fakeRonViewInflater)
+            .inflateView(eq(mockRonModel), any(), eq(entry), any(), eq(privateLayout))
+        assertThat(row.privateLayout.contractedChild).isSameInstanceAs(ronView)
+        verify(mockBinder).setupContentViewBinder()
+    }
+
+    @Test
+    fun ronViewAppliesElementsInOrder() {
+        val oldHandle = mock<DisposableHandle>()
+        val mockRonModel = mock<TimerContentModel>()
+        val ronView = View(context)
+        val mockBinder = mock<DeferredContentViewBinder>()
+
+        row.privateLayout.mContractedBinderHandle = oldHandle
+        val entry = spy(row.entry)
+        row.entry = entry
+        val privateLayout = spy(row.privateLayout)
+        row.privateLayout = privateLayout
+
+        fakeRonContentModel = mockRonModel
+        fakeRonViewHolder = InflatedContentViewHolder(view = ronView, binder = mockBinder)
+        // WHEN inflater inflates
+        inflateAndWait(notificationInflater, FLAG_CONTENT_VIEW_CONTRACTED, row)
+
+        // Validate that these 4 steps happen in this precise order
+        inOrder(oldHandle, entry, privateLayout, mockBinder) {
+            verify(oldHandle).dispose()
+            verify(entry).setContentModel(argThat { richOngoingContentModel === mockRonModel })
+            verify(privateLayout).setContractedChild(eq(ronView))
+            verify(mockBinder).setupContentViewBinder()
+        }
+    }
+
+    @Test
+    fun testRonNotReinflating() {
+        val handle0 = mock<DisposableHandle>()
+        val handle1 = mock<DisposableHandle>()
+        val ronView = View(context)
+        val mockRonModel1 = mock<TimerContentModel>()
+        val mockRonModel2 = mock<TimerContentModel>()
+        val mockBinder1 = mock<DeferredContentViewBinder>()
+        doReturn(handle1).whenever(mockBinder1).setupContentViewBinder()
+
+        row.privateLayout.mContractedBinderHandle = handle0
+        val entry = spy(row.entry)
+        row.entry = entry
+        val privateLayout = spy(row.privateLayout)
+        row.privateLayout = privateLayout
+
+        // WHEN inflater inflates both a model and a view
+        fakeRonContentModel = mockRonModel1
+        fakeRonViewHolder = InflatedContentViewHolder(view = ronView, binder = mockBinder1)
+        inflateAndWait(notificationInflater, FLAG_CONTENT_VIEW_CONTRACTED, row)
+
+        // Validate that these 4 steps happen in this precise order
+        inOrder(handle0, entry, privateLayout, mockBinder1, handle1) {
+            verify(handle0).dispose()
+            verify(entry).setContentModel(argThat { richOngoingContentModel === mockRonModel1 })
+            verify(privateLayout).setContractedChild(eq(ronView))
+            verify(mockBinder1).setupContentViewBinder()
+            verify(handle1, never()).dispose()
+        }
+
+        clearInvocations(handle0, entry, privateLayout, mockBinder1, handle1)
+
+        // THEN when the inflater inflates just a model
+        fakeRonContentModel = mockRonModel2
+        fakeRonViewHolder = null
+        inflateAndWait(notificationInflater, FLAG_CONTENT_VIEW_CONTRACTED, row)
+
+        // Validate that for reinflation, the only thing we do us update the model
+        verify(handle1, never()).dispose()
+        verify(entry).setContentModel(argThat { richOngoingContentModel === mockRonModel2 })
+        verify(privateLayout, never()).setContractedChild(any())
+        verify(mockBinder1, never()).setupContentViewBinder()
+        verify(handle1, never()).dispose()
+    }
+
+    @Test
     fun testNotificationViewHeightTooSmallFailsValidation() {
         val validationError =
             getValidationError(
diff --git a/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/row/NotificationTestHelper.java b/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/row/NotificationTestHelper.java
index 21d586b1b5fc..c74a04f1c3e0 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/row/NotificationTestHelper.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/row/NotificationTestHelper.java
@@ -199,6 +199,8 @@ public class NotificationTestHelper {
                                 mock(NotifRemoteViewCache.class),
                                 mock(NotificationRemoteInputManager.class),
                                 mock(ConversationNotificationProcessor.class),
+                                mock(RichOngoingNotificationContentExtractor.class),
+                                mock(RichOngoingNotificationViewInflater.class),
                                 mock(Executor.class),
                                 new MockSmartReplyInflater(),
                                 mock(NotifLayoutInflaterFactory.Provider.class),
diff --git a/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/row/ExpandableNotificationRowBuilder.kt b/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/row/ExpandableNotificationRowBuilder.kt
index c72da64120af..16dc50f96676 100644
--- a/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/row/ExpandableNotificationRowBuilder.kt
+++ b/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/row/ExpandableNotificationRowBuilder.kt
@@ -215,6 +215,8 @@ class ExpandableNotificationRowBuilder(
                     remoteInputManager,
                     conversationProcessor,
                     mock(),
+                    mock(),
+                    mock(),
                     smartReplyStateInflater,
                     notifLayoutInflaterFactoryProvider,
                     mock(),
diff --git a/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/row/data/repository/NotificationRowRepositoryKosmos.kt b/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/row/data/repository/NotificationRowRepositoryKosmos.kt
new file mode 100644
index 000000000000..84ef4b5c21c3
--- /dev/null
+++ b/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/row/data/repository/NotificationRowRepositoryKosmos.kt
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.notification.row.data.repository
+
+import com.android.systemui.kosmos.Kosmos
+import com.android.systemui.kosmos.Kosmos.Fixture
+import com.android.systemui.statusbar.notification.row.shared.RichOngoingContentModel
+import kotlinx.coroutines.flow.MutableStateFlow
+
+val Kosmos.fakeNotificationRowRepository by Fixture { FakeNotificationRowRepository() }
+
+class FakeNotificationRowRepository : NotificationRowRepository {
+    override val richOngoingContentModel = MutableStateFlow<RichOngoingContentModel?>(null)
+}
diff --git a/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/row/domain/interactor/NotificationRowInteractorKosmos.kt b/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/row/domain/interactor/NotificationRowInteractorKosmos.kt
new file mode 100644
index 000000000000..3a7d7ba064d0
--- /dev/null
+++ b/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/row/domain/interactor/NotificationRowInteractorKosmos.kt
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.notification.row.domain.interactor
+
+import com.android.systemui.kosmos.Kosmos
+import com.android.systemui.statusbar.notification.row.data.repository.NotificationRowRepository
+
+fun Kosmos.getNotificationRowInteractor(repository: NotificationRowRepository) =
+    NotificationRowInteractor(repository = repository)
diff --git a/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/row/ui/viewmodel/TimerViewModelKosmos.kt b/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/row/ui/viewmodel/TimerViewModelKosmos.kt
new file mode 100644
index 000000000000..00f45b220654
--- /dev/null
+++ b/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/notification/row/ui/viewmodel/TimerViewModelKosmos.kt
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.notification.row.ui.viewmodel
+
+import com.android.systemui.dump.dumpManager
+import com.android.systemui.kosmos.Kosmos
+import com.android.systemui.statusbar.notification.row.data.repository.NotificationRowRepository
+import com.android.systemui.statusbar.notification.row.domain.interactor.getNotificationRowInteractor
+
+fun Kosmos.getTimerViewModel(repository: NotificationRowRepository) =
+    TimerViewModel(
+        dumpManager = dumpManager,
+        rowInteractor = getNotificationRowInteractor(repository),
+    )