Merge "Implements basic version of Backlinks" into main

8 files changed, 612 insertions, 41 deletions

diff --git a/packages/SystemUI/res/layout/app_clips_screenshot.xml b/packages/SystemUI/res/layout/app_clips_screenshot.xml
index bcc7bca8c915..a3af9490f585 100644
--- a/packages/SystemUI/res/layout/app_clips_screenshot.xml
+++ b/packages/SystemUI/res/layout/app_clips_screenshot.xml
@@ -51,6 +51,15 @@
         app:layout_constraintStart_toEndOf="@id/save"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <TextView
+        android:id="@+id/backlinks_data"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="8dp"
+        android:visibility="gone"
+        app:layout_constraintStart_toEndOf="@id/cancel"
+        app:layout_constraintTop_toTopOf="parent" />
+
     <ImageView
         android:id="@+id/preview"
         android:layout_width="0px"
diff --git a/packages/SystemUI/res/values/strings.xml b/packages/SystemUI/res/values/strings.xml
index 82dafc3ed1df..e13b803cc9ed 100644
--- a/packages/SystemUI/res/values/strings.xml
+++ b/packages/SystemUI/res/values/strings.xml
@@ -269,6 +269,8 @@
     <string name="screenshot_detected_multiple_template"><xliff:g id="appName" example="Google Chrome">%1$s</xliff:g> and other open apps detected this screenshot.</string>
     <!-- Add to note button used in App Clips flow to return the saved screenshot image to notes app. [CHAR LIMIT=NONE] -->
     <string name="app_clips_save_add_to_note">Add to note</string>
+    <!-- TODO(b/300307759): Temporary string for text view that displays backlinks data. [CHAR LIMIT=NONE] -->
+    <string name="backlinks_string" translatable="false">Open <xliff:g id="appName" example="Google Chrome">%1$s</xliff:g></string>
 
     <!-- Notification title displayed for screen recording [CHAR LIMIT=50]-->
     <string name="screenrecord_title">Screen Recorder</string>
diff --git a/packages/SystemUI/src/com/android/systemui/screenshot/appclips/AppClipsActivity.java b/packages/SystemUI/src/com/android/systemui/screenshot/appclips/AppClipsActivity.java
index d87d85b93b9d..59b47dc8d0ab 100644
--- a/packages/SystemUI/src/com/android/systemui/screenshot/appclips/AppClipsActivity.java
+++ b/packages/SystemUI/src/com/android/systemui/screenshot/appclips/AppClipsActivity.java
@@ -16,16 +16,20 @@
 
 package com.android.systemui.screenshot.appclips;
 
+import static android.app.ActivityTaskManager.INVALID_TASK_ID;
+
 import static com.android.systemui.screenshot.appclips.AppClipsEvent.SCREENSHOT_FOR_NOTE_ACCEPTED;
 import static com.android.systemui.screenshot.appclips.AppClipsEvent.SCREENSHOT_FOR_NOTE_CANCELLED;
 import static com.android.systemui.screenshot.appclips.AppClipsTrampolineActivity.ACTION_FINISH_FROM_TRAMPOLINE;
 import static com.android.systemui.screenshot.appclips.AppClipsTrampolineActivity.EXTRA_CALLING_PACKAGE_NAME;
+import static com.android.systemui.screenshot.appclips.AppClipsTrampolineActivity.EXTRA_CALLING_PACKAGE_TASK_ID;
 import static com.android.systemui.screenshot.appclips.AppClipsTrampolineActivity.EXTRA_RESULT_RECEIVER;
 import static com.android.systemui.screenshot.appclips.AppClipsTrampolineActivity.EXTRA_SCREENSHOT_URI;
 import static com.android.systemui.screenshot.appclips.AppClipsTrampolineActivity.PERMISSION_SELF;
 
 import android.app.Activity;
 import android.content.BroadcastReceiver;
+import android.content.ClipData;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
@@ -43,6 +47,7 @@ import android.util.Log;
 import android.view.View;
 import android.widget.Button;
 import android.widget.ImageView;
+import android.widget.TextView;
 
 import androidx.activity.ComponentActivity;
 import androidx.annotation.Nullable;
@@ -51,10 +56,13 @@ import androidx.lifecycle.ViewModelProvider;
 import com.android.internal.logging.UiEventLogger;
 import com.android.internal.logging.UiEventLogger.UiEventEnum;
 import com.android.settingslib.Utils;
+import com.android.systemui.Flags;
 import com.android.systemui.res.R;
 import com.android.systemui.screenshot.scroll.CropView;
 import com.android.systemui.settings.UserTracker;
 
+import java.util.Set;
+
 import javax.inject.Inject;
 
 /**
@@ -73,8 +81,6 @@ import javax.inject.Inject;
  *
  * <p>This {@link Activity} runs in its own separate process to isolate memory intensive image
  * editing from SysUI process.
- *
- * TODO(b/267309532): Polish UI and animations.
  */
 public class AppClipsActivity extends ComponentActivity {
 
@@ -94,6 +100,7 @@ public class AppClipsActivity extends ComponentActivity {
     private CropView mCropView;
     private Button mSave;
     private Button mCancel;
+    private TextView mBacklinksData;
     private AppClipsViewModel mViewModel;
 
     private ResultReceiver mResultReceiver;
@@ -153,11 +160,10 @@ public class AppClipsActivity extends ComponentActivity {
         mCancel = mLayout.findViewById(R.id.cancel);
         mSave.setOnClickListener(this::onClick);
         mCancel.setOnClickListener(this::onClick);
-
-
         mCropView = mLayout.findViewById(R.id.crop_view);
-
+        mBacklinksData = mLayout.findViewById(R.id.backlinks_data);
         mPreview = mLayout.findViewById(R.id.preview);
+
         mPreview.addOnLayoutChangeListener(
                 (v, left, top, right, bottom, oldLeft, oldTop, oldRight, oldBottom) ->
                         updateImageDimensions());
@@ -166,9 +172,19 @@ public class AppClipsActivity extends ComponentActivity {
         mViewModel.getScreenshot().observe(this, this::setScreenshot);
         mViewModel.getResultLiveData().observe(this, this::setResultThenFinish);
         mViewModel.getErrorLiveData().observe(this, this::setErrorThenFinish);
+        mViewModel.getBacklinksLiveData().observe(this, this::setBacklinksData);
 
         if (savedInstanceState == null) {
-            mViewModel.performScreenshot();
+            int displayId = getDisplayId();
+            mViewModel.performScreenshot(displayId);
+
+            if (Flags.appClipsBacklinks()) {
+                int appClipsTaskId = getTaskId();
+                int callingPackageTaskId = intent.getIntExtra(EXTRA_CALLING_PACKAGE_TASK_ID,
+                        INVALID_TASK_ID);
+                Set<Integer> taskIdsToIgnore = Set.of(appClipsTaskId, callingPackageTaskId);
+                mViewModel.triggerBacklinks(taskIdsToIgnore, displayId);
+            }
         }
     }
 
@@ -281,6 +297,15 @@ public class AppClipsActivity extends ComponentActivity {
         finish();
     }
 
+    private void setBacklinksData(ClipData clipData) {
+        if (mBacklinksData.getVisibility() == View.GONE) {
+            mBacklinksData.setVisibility(View.VISIBLE);
+        }
+
+        mBacklinksData.setText(String.format(getString(R.string.backlinks_string),
+                clipData.getDescription().getLabel()));
+    }
+
     private void setError(int errorCode) {
         if (mResultReceiver == null) {
             return;
diff --git a/packages/SystemUI/src/com/android/systemui/screenshot/appclips/AppClipsCrossProcessHelper.java b/packages/SystemUI/src/com/android/systemui/screenshot/appclips/AppClipsCrossProcessHelper.java
index 7de22b1a9c77..aaa5dfc01ba3 100644
--- a/packages/SystemUI/src/com/android/systemui/screenshot/appclips/AppClipsCrossProcessHelper.java
+++ b/packages/SystemUI/src/com/android/systemui/screenshot/appclips/AppClipsCrossProcessHelper.java
@@ -20,6 +20,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.os.UserHandle;
+import android.util.Log;
 
 import androidx.annotation.Nullable;
 
@@ -27,19 +28,18 @@ import com.android.internal.infra.AndroidFuture;
 import com.android.internal.infra.ServiceConnector;
 import com.android.systemui.dagger.SysUISingleton;
 import com.android.systemui.dagger.qualifiers.Application;
-import com.android.systemui.settings.DisplayTracker;
 
 import javax.inject.Inject;
 
 /** An intermediary singleton object to help communicating with the cross process service. */
 @SysUISingleton
 class AppClipsCrossProcessHelper {
+    private static final String TAG = AppClipsCrossProcessHelper.class.getSimpleName();
 
     private final ServiceConnector<IAppClipsScreenshotHelperService> mProxyConnector;
-    private final DisplayTracker mDisplayTracker;
 
     @Inject
-    AppClipsCrossProcessHelper(@Application Context context, DisplayTracker displayTracker) {
+    AppClipsCrossProcessHelper(@Application Context context) {
         // Start a service as main user so that even if the app clips activity is running as work
         // profile user the service is able to use correct instance of Bubbles to grab a screenshot
         // excluding the bubble layer.
@@ -48,7 +48,6 @@ class AppClipsCrossProcessHelper {
                 Context.BIND_AUTO_CREATE | Context.BIND_WAIVE_PRIORITY
                         | Context.BIND_NOT_VISIBLE, UserHandle.USER_SYSTEM,
                 IAppClipsScreenshotHelperService.Stub::asInterface);
-        mDisplayTracker = displayTracker;
     }
 
     /**
@@ -58,15 +57,16 @@ class AppClipsCrossProcessHelper {
      * pass around but not a {@link Bitmap}.
      */
     @Nullable
-    Bitmap takeScreenshot() {
+    Bitmap takeScreenshot(int displayId) {
         try {
             AndroidFuture<ScreenshotHardwareBufferInternal> future =
                     mProxyConnector.postForResult(
-                            service ->
-                                    // Take a screenshot of the default display of the user.
-                                    service.takeScreenshot(mDisplayTracker.getDefaultDisplayId()));
+                            service -> service.takeScreenshot(displayId));
             return future.get().createBitmapThenCloseBuffer();
         } catch (Exception e) {
+            Log.e(TAG,
+                    String.format("Error while capturing a screenshot of displayId %d", displayId),
+                    e);
             return null;
         }
     }
diff --git a/packages/SystemUI/src/com/android/systemui/screenshot/appclips/AppClipsTrampolineActivity.java b/packages/SystemUI/src/com/android/systemui/screenshot/appclips/AppClipsTrampolineActivity.java
index 48449b393903..3c4469d052b1 100644
--- a/packages/SystemUI/src/com/android/systemui/screenshot/appclips/AppClipsTrampolineActivity.java
+++ b/packages/SystemUI/src/com/android/systemui/screenshot/appclips/AppClipsTrampolineActivity.java
@@ -85,6 +85,7 @@ public class AppClipsTrampolineActivity extends Activity {
     static final String ACTION_FINISH_FROM_TRAMPOLINE = TAG + "FINISH_FROM_TRAMPOLINE";
     static final String EXTRA_RESULT_RECEIVER = TAG + "RESULT_RECEIVER";
     static final String EXTRA_CALLING_PACKAGE_NAME = TAG + "CALLING_PACKAGE_NAME";
+    static final String EXTRA_CALLING_PACKAGE_TASK_ID = TAG + "CALLING_PACKAGE_TASK_ID";
     private static final ApplicationInfoFlags APPLICATION_INFO_FLAGS = ApplicationInfoFlags.of(0);
 
     private final NoteTaskController mNoteTaskController;
@@ -193,12 +194,14 @@ public class AppClipsTrampolineActivity extends Activity {
         ComponentName componentName = ComponentName.unflattenFromString(
                     getString(R.string.config_screenshotAppClipsActivityComponent));
         String callingPackageName = getCallingPackage();
+        int callingPackageTaskId = getTaskId();
 
         Intent intent = new Intent()
                 .setComponent(componentName)
                 .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
                 .putExtra(EXTRA_RESULT_RECEIVER, mResultReceiver)
-                .putExtra(EXTRA_CALLING_PACKAGE_NAME, callingPackageName);
+                .putExtra(EXTRA_CALLING_PACKAGE_NAME, callingPackageName)
+                .putExtra(EXTRA_CALLING_PACKAGE_TASK_ID, callingPackageTaskId);
         try {
             startActivity(intent);
 
diff --git a/packages/SystemUI/src/com/android/systemui/screenshot/appclips/AppClipsViewModel.java b/packages/SystemUI/src/com/android/systemui/screenshot/appclips/AppClipsViewModel.java
index 630d3380f4d7..9bb7bbfbe4c3 100644
--- a/packages/SystemUI/src/com/android/systemui/screenshot/appclips/AppClipsViewModel.java
+++ b/packages/SystemUI/src/com/android/systemui/screenshot/appclips/AppClipsViewModel.java
@@ -16,9 +16,23 @@
 
 package com.android.systemui.screenshot.appclips;
 
+import static android.content.Intent.ACTION_MAIN;
+import static android.content.Intent.ACTION_VIEW;
 import static android.content.Intent.CAPTURE_CONTENT_FOR_NOTE_FAILED;
+import static android.content.Intent.CATEGORY_LAUNCHER;
 
+import static com.google.common.util.concurrent.Futures.withTimeout;
+
+import static java.util.concurrent.Executors.newSingleThreadScheduledExecutor;
+
+import android.app.ActivityTaskManager.RootTaskInfo;
+import android.app.IActivityTaskManager;
+import android.app.WindowConfiguration;
+import android.app.assist.AssistContent;
+import android.content.ClipData;
+import android.content.ComponentName;
 import android.content.Intent;
+import android.content.pm.PackageManager;
 import android.graphics.Bitmap;
 import android.graphics.HardwareRenderer;
 import android.graphics.RecordingCanvas;
@@ -26,10 +40,13 @@ import android.graphics.Rect;
 import android.graphics.RenderNode;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;
+import android.os.RemoteException;
 import android.os.UserHandle;
+import android.util.Log;
 import android.view.Display;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.lifecycle.LiveData;
 import androidx.lifecycle.MutableLiveData;
 import androidx.lifecycle.ViewModel;
@@ -37,22 +54,36 @@ import androidx.lifecycle.ViewModelProvider;
 
 import com.android.systemui.dagger.qualifiers.Background;
 import com.android.systemui.dagger.qualifiers.Main;
+import com.android.systemui.screenshot.AssistContentRequester;
 import com.android.systemui.screenshot.ImageExporter;
 
+import com.google.common.util.concurrent.FutureCallback;
+import com.google.common.util.concurrent.Futures;
 import com.google.common.util.concurrent.ListenableFuture;
+import com.google.common.util.concurrent.SettableFuture;
 
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
 import java.util.UUID;
 import java.util.concurrent.CancellationException;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Executor;
+import java.util.concurrent.TimeUnit;
 
 import javax.inject.Inject;
 
 /** A {@link ViewModel} to help with the App Clips screenshot flow. */
 final class AppClipsViewModel extends ViewModel {
 
+    private static final String TAG = AppClipsViewModel.class.getSimpleName();
+
     private final AppClipsCrossProcessHelper mAppClipsCrossProcessHelper;
     private final ImageExporter mImageExporter;
+    private final IActivityTaskManager mAtmService;
+    private final AssistContentRequester mAssistContentRequester;
+    private final PackageManager mPackageManager;
+
     @Main
     private final Executor mMainExecutor;
     @Background
@@ -61,24 +92,34 @@ final class AppClipsViewModel extends ViewModel {
     private final MutableLiveData<Bitmap> mScreenshotLiveData;
     private final MutableLiveData<Uri> mResultLiveData;
     private final MutableLiveData<Integer> mErrorLiveData;
+    private final MutableLiveData<ClipData> mBacklinksLiveData;
 
-    AppClipsViewModel(AppClipsCrossProcessHelper appClipsCrossProcessHelper,
-            ImageExporter imageExporter, @Main Executor mainExecutor,
-            @Background Executor bgExecutor) {
+    private AppClipsViewModel(AppClipsCrossProcessHelper appClipsCrossProcessHelper,
+            ImageExporter imageExporter, IActivityTaskManager atmService,
+            AssistContentRequester assistContentRequester, PackageManager packageManager,
+            @Main Executor mainExecutor, @Background Executor bgExecutor) {
         mAppClipsCrossProcessHelper = appClipsCrossProcessHelper;
         mImageExporter = imageExporter;
+        mAtmService = atmService;
+        mAssistContentRequester = assistContentRequester;
+        mPackageManager = packageManager;
         mMainExecutor = mainExecutor;
         mBgExecutor = bgExecutor;
 
         mScreenshotLiveData = new MutableLiveData<>();
         mResultLiveData = new MutableLiveData<>();
         mErrorLiveData = new MutableLiveData<>();
+        mBacklinksLiveData = new MutableLiveData<>();
     }
 
-    /** Grabs a screenshot and updates the {@link Bitmap} set in screenshot {@link LiveData}. */
-    void performScreenshot() {
+    /**
+     * Grabs a screenshot and updates the {@link Bitmap} set in screenshot {@link #getScreenshot()}.
+     *
+     * @param displayId id of the {@link Display} to capture screenshot.
+     */
+    void performScreenshot(int displayId) {
         mBgExecutor.execute(() -> {
-            Bitmap screenshot = mAppClipsCrossProcessHelper.takeScreenshot();
+            Bitmap screenshot = mAppClipsCrossProcessHelper.takeScreenshot(displayId);
             mMainExecutor.execute(() -> {
                 if (screenshot == null) {
                     mErrorLiveData.setValue(CAPTURE_CONTENT_FOR_NOTE_FAILED);
@@ -89,6 +130,38 @@ final class AppClipsViewModel extends ViewModel {
         });
     }
 
+    /**
+     * Triggers the Backlinks flow which:
+     * <ul>
+     *     <li>Evaluates the task to query.
+     *     <li>Requests {@link AssistContent} from that task.
+     *     <li>Transforms the {@link AssistContent} into {@link ClipData} for Backlinks.
+     *     <li>The {@link ClipData} is reported to activity via {@link #getBacklinksLiveData()}.
+     * </ul>
+     *
+     * @param taskIdsToIgnore id of the tasks to ignore when querying for {@link AssistContent}
+     * @param displayId       id of the display to query tasks for Backlinks data
+     */
+    void triggerBacklinks(Set<Integer> taskIdsToIgnore, int displayId) {
+        mBgExecutor.execute(() -> {
+            ListenableFuture<ClipData> backlinksData = getBacklinksData(taskIdsToIgnore, displayId);
+            Futures.addCallback(backlinksData, new FutureCallback<>() {
+                @Override
+                public void onSuccess(@Nullable ClipData result) {
+                    if (result != null) {
+                        mBacklinksLiveData.setValue(result);
+                    }
+                }
+
+                @Override
+                public void onFailure(Throwable t) {
+                    Log.e(TAG, "Error querying for Backlinks data", t);
+                }
+            }, mMainExecutor);
+
+        });
+    }
+
     /** Returns a {@link LiveData} that holds the captured screenshot. */
     LiveData<Bitmap> getScreenshot() {
         return mScreenshotLiveData;
@@ -107,6 +180,11 @@ final class AppClipsViewModel extends ViewModel {
         return mErrorLiveData;
     }
 
+    /** Returns a {@link LiveData} that holds the Backlinks data in {@link ClipData}. */
+    LiveData<ClipData> getBacklinksLiveData() {
+        return mBacklinksLiveData;
+    }
+
     /**
      * Saves the provided {@link Drawable} to storage then informs the result {@link Uri} to
      * {@link LiveData}.
@@ -148,21 +226,144 @@ final class AppClipsViewModel extends ViewModel {
         return HardwareRenderer.createHardwareBitmap(output, bounds.width(), bounds.height());
     }
 
+    private ListenableFuture<ClipData> getBacklinksData(Set<Integer> taskIdsToIgnore,
+            int displayId) {
+        return getAllRootTaskInfosOnDisplay(displayId)
+                .stream()
+                .filter(taskInfo -> shouldIncludeTask(taskInfo, taskIdsToIgnore))
+                .findFirst()
+                .map(this::getBacklinksDataForTaskId)
+                .orElse(Futures.immediateFuture(null));
+    }
+
+    private List<RootTaskInfo> getAllRootTaskInfosOnDisplay(int displayId) {
+        try {
+            return mAtmService.getAllRootTaskInfosOnDisplay(displayId);
+        } catch (RemoteException e) {
+            Log.e(TAG, String.format("Error while querying for tasks on display %d", displayId), e);
+            return Collections.emptyList();
+        }
+    }
+
+    private boolean shouldIncludeTask(RootTaskInfo taskInfo, Set<Integer> taskIdsToIgnore) {
+        // Only consider tasks that shouldn't be ignored, are visible, running, and have a launcher
+        // icon. Furthermore, types such as launcher/home/dock/assistant are ignored.
+        return !taskIdsToIgnore.contains(taskInfo.taskId)
+                && taskInfo.isVisible
+                && taskInfo.isRunning
+                && taskInfo.numActivities > 0
+                && taskInfo.topActivity != null
+                && taskInfo.topActivityInfo != null
+                && taskInfo.childTaskIds.length > 0
+                && taskInfo.getActivityType() == WindowConfiguration.ACTIVITY_TYPE_STANDARD
+                && canAppStartThroughLauncher(taskInfo.topActivity.getPackageName());
+    }
+
+    private boolean canAppStartThroughLauncher(String packageName) {
+        return getMainLauncherIntentForPackage(packageName).resolveActivity(mPackageManager)
+                != null;
+    }
+
+    private ListenableFuture<ClipData> getBacklinksDataForTaskId(RootTaskInfo taskInfo) {
+        SettableFuture<ClipData> backlinksData = SettableFuture.create();
+        int taskId = taskInfo.taskId;
+        mAssistContentRequester.requestAssistContent(taskId, assistContent ->
+                backlinksData.set(getBacklinksDataFromAssistContent(taskInfo, assistContent)));
+        return withTimeout(backlinksData, 5L, TimeUnit.SECONDS, newSingleThreadScheduledExecutor());
+    }
+
+    /**
+     * A utility method to get {@link ClipData} to use for Backlinks functionality from
+     * {@link AssistContent} received from the app whose screenshot is taken.
+     *
+     * <p>There are multiple ways an app can provide deep-linkable data via {@link AssistContent}
+     * but Backlinks restricts to using only one way. The following is the ordered list based on
+     * preference:
+     * <ul>
+     *     <li>{@link AssistContent#getWebUri()} is the most preferred way.
+     *     <li>Second preference is given to {@link AssistContent#getIntent()} when the app provides
+     *     the intent, see {@link AssistContent#isAppProvidedIntent()}.
+     *     <li>The last preference is given to an {@link Intent} that is built using
+     *     {@link Intent#ACTION_MAIN} and {@link Intent#CATEGORY_LAUNCHER}.
+     * </ul>
+     *
+     * @param taskInfo {@link RootTaskInfo} of the task which provided the {@link AssistContent}.
+     * @param content the {@link AssistContent} to map into Backlinks {@link ClipData}.
+     * @return {@link ClipData} that represents the Backlinks data.
+     */
+    private ClipData getBacklinksDataFromAssistContent(RootTaskInfo taskInfo,
+            @Nullable AssistContent content) {
+        String appName = getAppNameOfTask(taskInfo);
+        String packageName = taskInfo.topActivity.getPackageName();
+        ClipData fallback = ClipData.newIntent(appName,
+                getMainLauncherIntentForPackage(packageName));
+        if (content == null) {
+            return fallback;
+        }
+
+        // First preference is given to app provided uri.
+        if (content.isAppProvidedWebUri()) {
+            Uri uri = content.getWebUri();
+            Intent backlinksIntent = new Intent(ACTION_VIEW).setData(uri);
+            if (doesIntentResolveToSamePackage(backlinksIntent, packageName)) {
+                return ClipData.newRawUri(appName, uri);
+            }
+        }
+
+        // Second preference is given to app provided, hopefully deep-linking, intent.
+        if (content.isAppProvidedIntent()) {
+            Intent backlinksIntent = content.getIntent();
+            if (doesIntentResolveToSamePackage(backlinksIntent, packageName)) {
+                return ClipData.newIntent(appName, backlinksIntent);
+            }
+        }
+
+        return fallback;
+    }
+
+    private boolean doesIntentResolveToSamePackage(Intent intentToResolve,
+            String requiredPackageName) {
+        ComponentName resolvedComponent = intentToResolve.resolveActivity(mPackageManager);
+        if (resolvedComponent == null) {
+            return false;
+        }
+
+        return resolvedComponent.getPackageName().equals(requiredPackageName);
+    }
+
+    private String getAppNameOfTask(RootTaskInfo taskInfo) {
+        return taskInfo.topActivityInfo.loadLabel(mPackageManager).toString();
+    }
+
+    private Intent getMainLauncherIntentForPackage(String packageName) {
+        return new Intent(ACTION_MAIN)
+                .addCategory(CATEGORY_LAUNCHER)
+                .setPackage(packageName);
+    }
+
     /** Helper factory to help with injecting {@link AppClipsViewModel}. */
     static final class Factory implements ViewModelProvider.Factory {
 
         private final AppClipsCrossProcessHelper mAppClipsCrossProcessHelper;
         private final ImageExporter mImageExporter;
+        private final IActivityTaskManager mAtmService;
+        private final AssistContentRequester mAssistContentRequester;
+        private final PackageManager mPackageManager;
         @Main
         private final Executor mMainExecutor;
         @Background
         private final Executor mBgExecutor;
 
         @Inject
-        Factory(AppClipsCrossProcessHelper appClipsCrossProcessHelper,  ImageExporter imageExporter,
-                @Main Executor mainExecutor, @Background Executor bgExecutor) {
+        Factory(AppClipsCrossProcessHelper appClipsCrossProcessHelper, ImageExporter imageExporter,
+                IActivityTaskManager atmService, AssistContentRequester assistContentRequester,
+                PackageManager packageManager, @Main Executor mainExecutor,
+                @Background Executor bgExecutor) {
             mAppClipsCrossProcessHelper = appClipsCrossProcessHelper;
             mImageExporter = imageExporter;
+            mAtmService = atmService;
+            mAssistContentRequester = assistContentRequester;
+            mPackageManager = packageManager;
             mMainExecutor = mainExecutor;
             mBgExecutor = bgExecutor;
         }
@@ -176,7 +377,8 @@ final class AppClipsViewModel extends ViewModel {
 
             //noinspection unchecked
             return (T) new AppClipsViewModel(mAppClipsCrossProcessHelper, mImageExporter,
-                    mMainExecutor, mBgExecutor);
+                    mAtmService, mAssistContentRequester, mPackageManager, mMainExecutor,
+                    mBgExecutor);
         }
     }
 }
diff --git a/packages/SystemUI/tests/src/com/android/systemui/screenshot/appclips/AppClipsActivityTest.java b/packages/SystemUI/tests/src/com/android/systemui/screenshot/appclips/AppClipsActivityTest.java
index 68a689321219..2981590a3037 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/screenshot/appclips/AppClipsActivityTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/screenshot/appclips/AppClipsActivityTest.java
@@ -17,6 +17,7 @@
 package com.android.systemui.screenshot.appclips;
 
 import static android.app.Activity.RESULT_OK;
+import static android.app.WindowConfiguration.ACTIVITY_TYPE_STANDARD;
 
 import static com.android.systemui.screenshot.appclips.AppClipsEvent.SCREENSHOT_FOR_NOTE_ACCEPTED;
 import static com.android.systemui.screenshot.appclips.AppClipsEvent.SCREENSHOT_FOR_NOTE_CANCELLED;
@@ -25,30 +26,45 @@ import static com.google.common.truth.Truth.assertThat;
 import static com.google.common.util.concurrent.MoreExecutors.directExecutor;
 
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
+import android.app.ActivityTaskManager.RootTaskInfo;
+import android.app.IActivityTaskManager;
+import android.app.assist.AssistContent;
+import android.content.ComponentName;
 import android.content.Intent;
+import android.content.pm.ActivityInfo;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.ApplicationInfoFlags;
+import android.content.pm.ResolveInfo;
 import android.graphics.Bitmap;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.Parcel;
 import android.os.Process;
+import android.os.RemoteException;
 import android.os.ResultReceiver;
+import android.platform.test.annotations.DisableFlags;
+import android.platform.test.annotations.EnableFlags;
 import android.testing.AndroidTestingRunner;
 import android.view.Display;
+import android.view.View;
 import android.widget.ImageView;
+import android.widget.TextView;
 
 import androidx.test.rule.ActivityTestRule;
 import androidx.test.runner.intercepting.SingleActivityFactory;
 
 import com.android.internal.logging.UiEventLogger;
+import com.android.systemui.Flags;
 import com.android.systemui.SysuiTestCase;
 import com.android.systemui.res.R;
+import com.android.systemui.screenshot.AssistContentRequester;
 import com.android.systemui.screenshot.ImageExporter;
 import com.android.systemui.settings.UserTracker;
 
@@ -60,9 +76,11 @@ import org.junit.Ignore;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
+import java.util.List;
 import java.util.UUID;
 import java.util.concurrent.Executor;
 import java.util.function.BiConsumer;
@@ -75,14 +93,27 @@ public final class AppClipsActivityTest extends SysuiTestCase {
     private static final Bitmap TEST_BITMAP = Bitmap.createBitmap(10, 10, Bitmap.Config.ARGB_8888);
     private static final String TEST_URI_STRING = "www.test-uri.com";
     private static final Uri TEST_URI = Uri.parse(TEST_URI_STRING);
-    private static final BiConsumer<Integer, Bundle> FAKE_CONSUMER = (unUsed1, unUsed2) -> {};
+    private static final BiConsumer<Integer, Bundle> FAKE_CONSUMER = (unUsed1, unUsed2) -> {
+    };
     private static final String TEST_CALLING_PACKAGE = "test-calling-package";
+    private static final int BACKLINKS_TASK_ID = 42;
+    private static final String BACKLINKS_TASK_APP_NAME = "Backlinks app";
+    private static final String BACKLINKS_TASK_PACKAGE_NAME = "backlinksTaskPackageName";
+    private static final RootTaskInfo TASK_THAT_SUPPORTS_BACKLINKS =
+            createTaskInfoForBacklinksTask();
+
+    private static final AssistContent ASSIST_CONTENT_FOR_BACKLINKS_TASK =
+            createAssistContentForBacklinksTask();
 
     @Mock
     private AppClipsCrossProcessHelper mAppClipsCrossProcessHelper;
     @Mock
     private ImageExporter mImageExporter;
     @Mock
+    private IActivityTaskManager mAtmService;
+    @Mock
+    private AssistContentRequester mAssistContentRequester;
+    @Mock
     private PackageManager mPackageManager;
     @Mock
     private UserTracker mUserTracker;
@@ -98,9 +129,10 @@ public final class AppClipsActivityTest extends SysuiTestCase {
                 protected AppClipsActivityTestable create(Intent unUsed) {
                     return new AppClipsActivityTestable(
                             new AppClipsViewModel.Factory(mAppClipsCrossProcessHelper,
-                                    mImageExporter, getContext().getMainExecutor(),
-                                    directExecutor()), mPackageManager, mUserTracker,
-                            mUiEventLogger);
+                                    mImageExporter, mAtmService, mAssistContentRequester,
+                                    mPackageManager, getContext().getMainExecutor(),
+                                    directExecutor()),
+                            mPackageManager, mUserTracker, mUiEventLogger);
                 }
             };
 
@@ -118,7 +150,7 @@ public final class AppClipsActivityTest extends SysuiTestCase {
         when(mPackageManager.getApplicationInfoAsUser(eq(TEST_CALLING_PACKAGE),
                 any(ApplicationInfoFlags.class), eq(TEST_USER_ID))).thenReturn(applicationInfo);
 
-        when(mAppClipsCrossProcessHelper.takeScreenshot()).thenReturn(TEST_BITMAP);
+        when(mAppClipsCrossProcessHelper.takeScreenshot(anyInt())).thenReturn(TEST_BITMAP);
         ImageExporter.Result result = new ImageExporter.Result();
         result.uri = TEST_URI;
         when(mImageExporter.export(any(Executor.class), any(UUID.class), any(Bitmap.class),
@@ -132,10 +164,13 @@ public final class AppClipsActivityTest extends SysuiTestCase {
     }
 
     @Test
+    @DisableFlags(Flags.FLAG_APP_CLIPS_BACKLINKS)
     public void appClipsLaunched_screenshotDisplayed() {
         launchActivity();
 
         assertThat(((ImageView) mActivity.findViewById(R.id.preview)).getDrawable()).isNotNull();
+        assertThat(mActivity.findViewById(R.id.backlinks_data).getVisibility())
+                .isEqualTo(View.GONE);
     }
 
     @Test
@@ -176,6 +211,32 @@ public final class AppClipsActivityTest extends SysuiTestCase {
         verify(mUiEventLogger).log(SCREENSHOT_FOR_NOTE_CANCELLED, TEST_UID, TEST_CALLING_PACKAGE);
     }
 
+    @Test
+    @EnableFlags(Flags.FLAG_APP_CLIPS_BACKLINKS)
+    public void appClipsLaunched_backlinks_displayed() throws RemoteException {
+        // Set up mocking to verify backlinks view is displayed on screen.
+        ArgumentCaptor<Integer> displayIdCaptor = ArgumentCaptor.forClass(Integer.class);
+        when(mAtmService.getAllRootTaskInfosOnDisplay(displayIdCaptor.capture()))
+                .thenReturn(List.of(TASK_THAT_SUPPORTS_BACKLINKS));
+        doAnswer(invocation -> {
+            AssistContentRequester.Callback callback = invocation.getArgument(1);
+            callback.onAssistContentAvailable(ASSIST_CONTENT_FOR_BACKLINKS_TASK);
+            return null;
+        }).when(mAssistContentRequester).requestAssistContent(eq(BACKLINKS_TASK_ID), any());
+        when(mPackageManager
+                .resolveActivity(any(Intent.class), anyInt()))
+                .thenReturn(createBacklinksTaskResolveInfo());
+
+        launchActivity();
+        waitForIdleSync();
+
+        assertThat(displayIdCaptor.getValue()).isEqualTo(mActivity.getDisplayId());
+        TextView backlinksData = mActivity.findViewById(R.id.backlinks_data);
+        assertThat(backlinksData.getVisibility()).isEqualTo(View.VISIBLE);
+        assertThat(backlinksData.getText().toString()).isEqualTo(
+                mActivity.getString(R.string.backlinks_string, BACKLINKS_TASK_APP_NAME));
+    }
+
     private void launchActivity() {
         launchActivity(createResultReceiver(FAKE_CONSUMER));
     }
@@ -203,7 +264,7 @@ public final class AppClipsActivityTest extends SysuiTestCase {
         testReceiver.writeToParcel(parcel, 0);
         parcel.setDataPosition(0);
 
-        testReceiver  = ResultReceiver.CREATOR.createFromParcel(parcel);
+        testReceiver = ResultReceiver.CREATOR.createFromParcel(parcel);
         parcel.recycle();
         return testReceiver;
     }
@@ -212,6 +273,37 @@ public final class AppClipsActivityTest extends SysuiTestCase {
         mContext.getMainExecutor().execute(runnable);
     }
 
+    private static ResolveInfo createBacklinksTaskResolveInfo() {
+        ActivityInfo activityInfo = new ActivityInfo();
+        activityInfo.applicationInfo = new ApplicationInfo();
+        activityInfo.name = BACKLINKS_TASK_APP_NAME;
+        activityInfo.packageName = BACKLINKS_TASK_PACKAGE_NAME;
+        activityInfo.applicationInfo.packageName = BACKLINKS_TASK_PACKAGE_NAME;
+        ResolveInfo resolveInfo = new ResolveInfo();
+        resolveInfo.activityInfo = activityInfo;
+        return resolveInfo;
+    }
+
+    private static RootTaskInfo createTaskInfoForBacklinksTask() {
+        RootTaskInfo taskInfo = new RootTaskInfo();
+        taskInfo.taskId = BACKLINKS_TASK_ID;
+        taskInfo.isVisible = true;
+        taskInfo.isRunning = true;
+        taskInfo.numActivities = 1;
+        taskInfo.topActivity = new ComponentName(BACKLINKS_TASK_PACKAGE_NAME, "backlinksClass");
+        taskInfo.topActivityInfo = createBacklinksTaskResolveInfo().activityInfo;
+        taskInfo.baseIntent = new Intent().setComponent(taskInfo.topActivity);
+        taskInfo.childTaskIds = new int[]{BACKLINKS_TASK_ID + 1};
+        taskInfo.configuration.windowConfiguration.setActivityType(ACTIVITY_TYPE_STANDARD);
+        return taskInfo;
+    }
+
+    private static AssistContent createAssistContentForBacklinksTask() {
+        AssistContent content = new AssistContent();
+        content.setWebUri(Uri.parse("https://developers.android.com"));
+        return content;
+    }
+
     public static class AppClipsActivityTestable extends AppClipsActivity {
 
         public AppClipsActivityTestable(AppClipsViewModel.Factory viewModelFactory,
diff --git a/packages/SystemUI/tests/src/com/android/systemui/screenshot/appclips/AppClipsViewModelTest.java b/packages/SystemUI/tests/src/com/android/systemui/screenshot/appclips/AppClipsViewModelTest.java
index ad0797c88f62..dcb75d1e187b 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/screenshot/appclips/AppClipsViewModelTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/screenshot/appclips/AppClipsViewModelTest.java
@@ -16,28 +16,51 @@
 
 package com.android.systemui.screenshot.appclips;
 
+import static android.app.WindowConfiguration.ACTIVITY_TYPE_HOME;
+import static android.app.WindowConfiguration.ACTIVITY_TYPE_STANDARD;
+import static android.content.ClipDescription.MIMETYPE_TEXT_INTENT;
+import static android.content.ClipDescription.MIMETYPE_TEXT_URILIST;
+import static android.content.Intent.ACTION_MAIN;
+import static android.content.Intent.ACTION_VIEW;
 import static android.content.Intent.CAPTURE_CONTENT_FOR_NOTE_FAILED;
+import static android.content.Intent.CATEGORY_LAUNCHER;
+import static android.view.Display.DEFAULT_DISPLAY;
 
 import static com.google.common.truth.Truth.assertThat;
 import static com.google.common.util.concurrent.MoreExecutors.directExecutor;
 
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.reset;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
+import android.app.ActivityTaskManager.RootTaskInfo;
+import android.app.IActivityTaskManager;
+import android.app.assist.AssistContent;
+import android.content.ClipData;
+import android.content.ClipDescription;
+import android.content.ComponentName;
+import android.content.Intent;
+import android.content.pm.ActivityInfo;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
 import android.graphics.Bitmap;
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.ShapeDrawable;
 import android.net.Uri;
 import android.os.Process;
+import android.os.RemoteException;
 import android.os.UserHandle;
-import android.view.Display;
 
 import androidx.test.runner.AndroidJUnit4;
 
 import com.android.systemui.SysuiTestCase;
+import com.android.systemui.screenshot.AssistContentRequester;
 import com.android.systemui.screenshot.ImageExporter;
 
 import com.google.common.util.concurrent.Futures;
@@ -45,9 +68,13 @@ import com.google.common.util.concurrent.Futures;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
 import java.util.UUID;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Executor;
@@ -60,27 +87,44 @@ public final class AppClipsViewModelTest extends SysuiTestCase {
     private static final Rect FAKE_RECT = new Rect();
     private static final Uri FAKE_URI = Uri.parse("www.test-uri.com");
     private static final UserHandle USER_HANDLE = Process.myUserHandle();
+    private static final int BACKLINKS_TASK_ID = 42;
+    private static final String BACKLINKS_TASK_APP_NAME = "Ultimate question app";
+    private static final String BACKLINKS_TASK_PACKAGE_NAME = "backlinksTaskPackageName";
+    private static final AssistContent EMPTY_ASSIST_CONTENT = new AssistContent();
 
     @Mock private AppClipsCrossProcessHelper mAppClipsCrossProcessHelper;
     @Mock private ImageExporter mImageExporter;
+    @Mock private IActivityTaskManager mAtmService;
+    @Mock private AssistContentRequester mAssistContentRequester;
+    @Mock
+    private PackageManager mPackageManager;
+    private ArgumentCaptor<Intent> mPackageManagerIntentCaptor;
     private AppClipsViewModel mViewModel;
 
     @Before
-    public void setUp() {
+    public void setUp() throws RemoteException {
         MockitoAnnotations.initMocks(this);
+        mPackageManagerIntentCaptor = ArgumentCaptor.forClass(Intent.class);
+
+        // Set up mocking for backlinks.
+        when(mAtmService.getAllRootTaskInfosOnDisplay(DEFAULT_DISPLAY))
+                .thenReturn(List.of(createTaskInfoForBacklinksTask()));
+        when(mPackageManager.resolveActivity(mPackageManagerIntentCaptor.capture(), anyInt()))
+                .thenReturn(createBacklinksTaskResolveInfo());
 
         mViewModel = new AppClipsViewModel.Factory(mAppClipsCrossProcessHelper, mImageExporter,
+                mAtmService, mAssistContentRequester, mPackageManager,
                 getContext().getMainExecutor(), directExecutor()).create(AppClipsViewModel.class);
     }
 
     @Test
     public void performScreenshot_fails_shouldUpdateErrorWithFailed() {
-        when(mAppClipsCrossProcessHelper.takeScreenshot()).thenReturn(null);
+        when(mAppClipsCrossProcessHelper.takeScreenshot(anyInt())).thenReturn(null);
 
-        mViewModel.performScreenshot();
+        mViewModel.performScreenshot(DEFAULT_DISPLAY);
         waitForIdleSync();
 
-        verify(mAppClipsCrossProcessHelper).takeScreenshot();
+        verify(mAppClipsCrossProcessHelper).takeScreenshot(DEFAULT_DISPLAY);
         assertThat(mViewModel.getErrorLiveData().getValue())
                 .isEqualTo(CAPTURE_CONTENT_FOR_NOTE_FAILED);
         assertThat(mViewModel.getResultLiveData().getValue()).isNull();
@@ -88,12 +132,12 @@ public final class AppClipsViewModelTest extends SysuiTestCase {
 
     @Test
     public void performScreenshot_succeeds_shouldUpdateScreenshotWithBitmap() {
-        when(mAppClipsCrossProcessHelper.takeScreenshot()).thenReturn(FAKE_BITMAP);
+        when(mAppClipsCrossProcessHelper.takeScreenshot(DEFAULT_DISPLAY)).thenReturn(FAKE_BITMAP);
 
-        mViewModel.performScreenshot();
+        mViewModel.performScreenshot(DEFAULT_DISPLAY);
         waitForIdleSync();
 
-        verify(mAppClipsCrossProcessHelper).takeScreenshot();
+        verify(mAppClipsCrossProcessHelper).takeScreenshot(DEFAULT_DISPLAY);
         assertThat(mViewModel.getErrorLiveData().getValue()).isNull();
         assertThat(mViewModel.getScreenshot().getValue()).isEqualTo(FAKE_BITMAP);
     }
@@ -101,7 +145,7 @@ public final class AppClipsViewModelTest extends SysuiTestCase {
     @Test
     public void saveScreenshot_throwsError_shouldUpdateErrorWithFailed() {
         when(mImageExporter.export(any(Executor.class), any(UUID.class), eq(null), eq(USER_HANDLE),
-                eq(Display.DEFAULT_DISPLAY))).thenReturn(
+                eq(DEFAULT_DISPLAY))).thenReturn(
                 Futures.immediateFailedFuture(new ExecutionException(new Throwable())));
 
         mViewModel.saveScreenshotThenFinish(FAKE_DRAWABLE, FAKE_RECT, USER_HANDLE);
@@ -115,7 +159,7 @@ public final class AppClipsViewModelTest extends SysuiTestCase {
     @Test
     public void saveScreenshot_failsSilently_shouldUpdateErrorWithFailed() {
         when(mImageExporter.export(any(Executor.class), any(UUID.class), eq(null), eq(USER_HANDLE),
-                eq(Display.DEFAULT_DISPLAY))).thenReturn(
+                eq(DEFAULT_DISPLAY))).thenReturn(
                 Futures.immediateFuture(new ImageExporter.Result()));
 
         mViewModel.saveScreenshotThenFinish(FAKE_DRAWABLE, FAKE_RECT, USER_HANDLE);
@@ -131,7 +175,7 @@ public final class AppClipsViewModelTest extends SysuiTestCase {
         ImageExporter.Result result = new ImageExporter.Result();
         result.uri = FAKE_URI;
         when(mImageExporter.export(any(Executor.class), any(UUID.class), eq(null), eq(USER_HANDLE),
-                eq(Display.DEFAULT_DISPLAY))).thenReturn(Futures.immediateFuture(result));
+                eq(DEFAULT_DISPLAY))).thenReturn(Futures.immediateFuture(result));
 
         mViewModel.saveScreenshotThenFinish(FAKE_DRAWABLE, FAKE_RECT, USER_HANDLE);
         waitForIdleSync();
@@ -139,4 +183,198 @@ public final class AppClipsViewModelTest extends SysuiTestCase {
         assertThat(mViewModel.getErrorLiveData().getValue()).isNull();
         assertThat(mViewModel.getResultLiveData().getValue()).isEqualTo(FAKE_URI);
     }
+
+    @Test
+    public void triggerBacklinks_shouldUpdateBacklinks_withUri() {
+        Uri expectedUri = Uri.parse("https://developers.android.com");
+        AssistContent contentWithUri = new AssistContent();
+        contentWithUri.setWebUri(expectedUri);
+        doAnswer(invocation -> {
+            AssistContentRequester.Callback callback = invocation.getArgument(1);
+            callback.onAssistContentAvailable(contentWithUri);
+            return null;
+        }).when(mAssistContentRequester).requestAssistContent(eq(BACKLINKS_TASK_ID), any());
+
+        mViewModel.triggerBacklinks(Collections.emptySet(), DEFAULT_DISPLAY);
+        waitForIdleSync();
+
+        Intent queriedIntent = mPackageManagerIntentCaptor.getValue();
+        assertThat(queriedIntent.getData()).isEqualTo(expectedUri);
+        assertThat(queriedIntent.getAction()).isEqualTo(ACTION_VIEW);
+
+        ClipData result = mViewModel.getBacklinksLiveData().getValue();
+        ClipDescription resultDescription = result.getDescription();
+        assertThat(resultDescription.getLabel().toString()).isEqualTo(BACKLINKS_TASK_APP_NAME);
+        assertThat(resultDescription.getMimeType(0)).isEqualTo(MIMETYPE_TEXT_URILIST);
+        assertThat(result.getItemCount()).isEqualTo(1);
+        assertThat(result.getItemAt(0).getUri()).isEqualTo(expectedUri);
+    }
+
+    @Test
+    public void triggerBacklinks_withNonResolvableUri_usesMainLauncherIntent() {
+        Uri expectedUri = Uri.parse("https://developers.android.com");
+        AssistContent contentWithUri = new AssistContent();
+        contentWithUri.setWebUri(expectedUri);
+        resetPackageManagerMockingForUsingFallbackBacklinks();
+        doAnswer(invocation -> {
+            AssistContentRequester.Callback callback = invocation.getArgument(1);
+            callback.onAssistContentAvailable(contentWithUri);
+            return null;
+        }).when(mAssistContentRequester).requestAssistContent(eq(BACKLINKS_TASK_ID), any());
+
+        mViewModel.triggerBacklinks(Collections.emptySet(), DEFAULT_DISPLAY);
+        waitForIdleSync();
+
+        verifyMainLauncherBacklinksIntent();
+    }
+
+    @Test
+    public void triggerBacklinks_shouldUpdateBacklinks_withAppProvidedIntent() {
+        Intent expectedIntent = new Intent().setPackage(BACKLINKS_TASK_PACKAGE_NAME);
+        AssistContent contentWithAppProvidedIntent = new AssistContent();
+        contentWithAppProvidedIntent.setIntent(expectedIntent);
+        doAnswer(invocation -> {
+            AssistContentRequester.Callback callback = invocation.getArgument(1);
+            callback.onAssistContentAvailable(contentWithAppProvidedIntent);
+            return null;
+        }).when(mAssistContentRequester).requestAssistContent(eq(BACKLINKS_TASK_ID), any());
+
+        mViewModel.triggerBacklinks(Collections.emptySet(), DEFAULT_DISPLAY);
+        waitForIdleSync();
+
+        Intent queriedIntent = mPackageManagerIntentCaptor.getValue();
+        assertThat(queriedIntent.getPackage()).isEqualTo(expectedIntent.getPackage());
+
+        ClipData result = mViewModel.getBacklinksLiveData().getValue();
+        ClipDescription resultDescription = result.getDescription();
+        assertThat(resultDescription.getLabel().toString()).isEqualTo(BACKLINKS_TASK_APP_NAME);
+        assertThat(resultDescription.getMimeType(0)).isEqualTo(MIMETYPE_TEXT_INTENT);
+        assertThat(result.getItemCount()).isEqualTo(1);
+        assertThat(result.getItemAt(0).getIntent()).isEqualTo(expectedIntent);
+    }
+
+    @Test
+    public void triggerBacklinks_withNonResolvableAppProvidedIntent_usesMainLauncherIntent() {
+        Intent expectedIntent = new Intent().setPackage(BACKLINKS_TASK_PACKAGE_NAME);
+        AssistContent contentWithAppProvidedIntent = new AssistContent();
+        contentWithAppProvidedIntent.setIntent(expectedIntent);
+        resetPackageManagerMockingForUsingFallbackBacklinks();
+        doAnswer(invocation -> {
+            AssistContentRequester.Callback callback = invocation.getArgument(1);
+            callback.onAssistContentAvailable(contentWithAppProvidedIntent);
+            return null;
+        }).when(mAssistContentRequester).requestAssistContent(eq(BACKLINKS_TASK_ID), any());
+
+        mViewModel.triggerBacklinks(Collections.emptySet(), DEFAULT_DISPLAY);
+        waitForIdleSync();
+
+        verifyMainLauncherBacklinksIntent();
+    }
+
+    @Test
+    public void triggerBacklinks_shouldUpdateBacklinks_withMainLauncherIntent() {
+        doAnswer(invocation -> {
+            AssistContentRequester.Callback callback = invocation.getArgument(1);
+            callback.onAssistContentAvailable(EMPTY_ASSIST_CONTENT);
+            return null;
+        }).when(mAssistContentRequester).requestAssistContent(eq(BACKLINKS_TASK_ID), any());
+
+        mViewModel.triggerBacklinks(Collections.emptySet(), DEFAULT_DISPLAY);
+        waitForIdleSync();
+
+        Intent queriedIntent = mPackageManagerIntentCaptor.getValue();
+        assertThat(queriedIntent.getPackage()).isEqualTo(BACKLINKS_TASK_PACKAGE_NAME);
+        assertThat(queriedIntent.getAction()).isEqualTo(ACTION_MAIN);
+        assertThat(queriedIntent.getCategories()).containsExactly(CATEGORY_LAUNCHER);
+
+        verifyMainLauncherBacklinksIntent();
+    }
+
+    @Test
+    public void triggerBacklinks_withNonResolvableMainLauncherIntent_noBacklinksAvailable() {
+        reset(mPackageManager);
+        doAnswer(invocation -> {
+            AssistContentRequester.Callback callback = invocation.getArgument(1);
+            callback.onAssistContentAvailable(EMPTY_ASSIST_CONTENT);
+            return null;
+        }).when(mAssistContentRequester).requestAssistContent(eq(BACKLINKS_TASK_ID), any());
+
+        mViewModel.triggerBacklinks(Collections.emptySet(), DEFAULT_DISPLAY);
+        waitForIdleSync();
+
+        assertThat(mViewModel.getBacklinksLiveData().getValue()).isNull();
+    }
+
+    @Test
+    public void triggerBacklinks_nonStandardActivityIgnored_noBacklinkAvailable()
+            throws RemoteException {
+        reset(mAtmService);
+        RootTaskInfo taskInfo = createTaskInfoForBacklinksTask();
+        taskInfo.configuration.windowConfiguration.setActivityType(ACTIVITY_TYPE_HOME);
+        when(mAtmService.getAllRootTaskInfosOnDisplay(DEFAULT_DISPLAY))
+                .thenReturn(List.of(taskInfo));
+
+        mViewModel.triggerBacklinks(Collections.emptySet(), DEFAULT_DISPLAY);
+        waitForIdleSync();
+
+        assertThat(mViewModel.getBacklinksLiveData().getValue()).isNull();
+    }
+
+    @Test
+    public void triggerBacklinks_taskIdsToIgnoreConsidered_noBacklinkAvailable() {
+        mViewModel.triggerBacklinks(Set.of(BACKLINKS_TASK_ID), DEFAULT_DISPLAY);
+        waitForIdleSync();
+
+        assertThat(mViewModel.getBacklinksLiveData().getValue()).isNull();
+    }
+
+    private void resetPackageManagerMockingForUsingFallbackBacklinks() {
+        reset(mPackageManager);
+        when(mPackageManager.resolveActivity(any(Intent.class), anyInt()))
+                // First the logic queries whether a package has a launcher activity, this should
+                // resolve otherwise the logic filters out the task.
+                .thenReturn(createBacklinksTaskResolveInfo())
+                // Then logic queries with the backlinks intent, this should not resolve for the
+                // logic to use the fallback intent.
+                .thenReturn(null);
+    }
+
+    private void verifyMainLauncherBacklinksIntent() {
+        ClipData result = mViewModel.getBacklinksLiveData().getValue();
+        assertThat(result.getItemCount()).isEqualTo(1);
+
+        ClipDescription resultDescription = result.getDescription();
+        assertThat(resultDescription.getLabel().toString()).isEqualTo(BACKLINKS_TASK_APP_NAME);
+        assertThat(resultDescription.getMimeType(0)).isEqualTo(MIMETYPE_TEXT_INTENT);
+
+        Intent actualBacklinksIntent = result.getItemAt(0).getIntent();
+        assertThat(actualBacklinksIntent.getPackage()).isEqualTo(BACKLINKS_TASK_PACKAGE_NAME);
+        assertThat(actualBacklinksIntent.getAction()).isEqualTo(ACTION_MAIN);
+        assertThat(actualBacklinksIntent.getCategories()).containsExactly(CATEGORY_LAUNCHER);
+    }
+
+    private static ResolveInfo createBacklinksTaskResolveInfo() {
+        ActivityInfo activityInfo = new ActivityInfo();
+        activityInfo.applicationInfo = new ApplicationInfo();
+        activityInfo.name = BACKLINKS_TASK_APP_NAME;
+        activityInfo.packageName = BACKLINKS_TASK_PACKAGE_NAME;
+        activityInfo.applicationInfo.packageName = BACKLINKS_TASK_PACKAGE_NAME;
+        ResolveInfo resolveInfo = new ResolveInfo();
+        resolveInfo.activityInfo = activityInfo;
+        return resolveInfo;
+    }
+
+    private static RootTaskInfo createTaskInfoForBacklinksTask() {
+        RootTaskInfo taskInfo = new RootTaskInfo();
+        taskInfo.taskId = BACKLINKS_TASK_ID;
+        taskInfo.isVisible = true;
+        taskInfo.isRunning = true;
+        taskInfo.numActivities = 1;
+        taskInfo.topActivity = new ComponentName(BACKLINKS_TASK_PACKAGE_NAME, "backlinksClass");
+        taskInfo.topActivityInfo = createBacklinksTaskResolveInfo().activityInfo;
+        taskInfo.baseIntent = new Intent().setComponent(taskInfo.topActivity);
+        taskInfo.childTaskIds = new int[]{BACKLINKS_TASK_ID + 1};
+        taskInfo.configuration.windowConfiguration.setActivityType(ACTIVITY_TYPE_STANDARD);
+        return taskInfo;
+    }
 }