Create a top intro preference widget

Based on our ux spec, so we create this widget to let everyone
can follow our spec easily.

Test: Apply this widget in Settings and confirm it.
Bug: 173087905
Change-Id: I481b350c417745cc3332b403877627e081cc0f73

5 files changed, 140 insertions, 0 deletions

diff --git a/packages/SettingsLib/Android.bp b/packages/SettingsLib/Android.bp
index 5afe2f3d2efc..3af4b25fb40c 100644
--- a/packages/SettingsLib/Android.bp
+++ b/packages/SettingsLib/Android.bp
@@ -51,6 +51,7 @@ java_defaults {
         "SettingsLibRadioButtonPreference",
         "SettingsLibDisplayDensityUtils",
         "SettingsLibUtils",
+        "SettingsLibTopIntroPreference",
     ],
 }
 
diff --git a/packages/SettingsLib/TopIntroPreference/Android.bp b/packages/SettingsLib/TopIntroPreference/Android.bp
new file mode 100644
index 000000000000..03becbd23226
--- /dev/null
+++ b/packages/SettingsLib/TopIntroPreference/Android.bp
@@ -0,0 +1,13 @@
+android_library {
+    name: "SettingsLibTopIntroPreference",
+
+    srcs: ["src/**/*.java"],
+    resource_dirs: ["res"],
+
+    static_libs: [
+        "androidx.annotation_annotation",
+        "androidx.preference_preference",
+    ],
+    sdk_version: "system_current",
+    min_sdk_version: "21",
+}
diff --git a/packages/SettingsLib/TopIntroPreference/AndroidManifest.xml b/packages/SettingsLib/TopIntroPreference/AndroidManifest.xml
new file mode 100644
index 000000000000..96d9e518663f
--- /dev/null
+++ b/packages/SettingsLib/TopIntroPreference/AndroidManifest.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2020 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.
+  -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="com.android.settingslib.widget">
+
+    <uses-sdk android:minSdkVersion="21" />
+
+</manifest>
diff --git a/packages/SettingsLib/TopIntroPreference/res/layout/top_intro_preference.xml b/packages/SettingsLib/TopIntroPreference/res/layout/top_intro_preference.xml
new file mode 100644
index 000000000000..19fa91f72f0d
--- /dev/null
+++ b/packages/SettingsLib/TopIntroPreference/res/layout/top_intro_preference.xml
@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2020 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.
+  -->
+
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:minHeight="?android:attr/listPreferredItemHeight"
+    android:paddingStart="?android:attr/listPreferredItemPaddingStart"
+    android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
+    android:background="?android:attr/selectableItemBackground"
+    android:clipToPadding="false">
+
+    <LinearLayout
+        android:id="@+id/icon_frame"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:minWidth="56dp"
+        android:gravity="start|top"
+        android:orientation="horizontal"
+        android:paddingEnd="12dp"
+        android:paddingTop="16dp"
+        android:paddingBottom="4dp">
+        <ImageView
+            android:id="@android:id/icon"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content" />
+    </LinearLayout>
+
+    <TextView
+        android:id="@android:id/title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:paddingBottom="16dp"
+        android:paddingTop="16dp"
+        android:clickable="false"
+        android:longClickable="false"
+        android:maxLines="10"
+        android:textColor="?android:attr/textColorSecondary"/>
+</LinearLayout>
\ No newline at end of file
diff --git a/packages/SettingsLib/TopIntroPreference/src/com/android/settingslib/widget/TopIntroPreference.java b/packages/SettingsLib/TopIntroPreference/src/com/android/settingslib/widget/TopIntroPreference.java
new file mode 100644
index 000000000000..9c82907da72a
--- /dev/null
+++ b/packages/SettingsLib/TopIntroPreference/src/com/android/settingslib/widget/TopIntroPreference.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2020 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.settingslib.widget;
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceViewHolder;
+
+/**
+ * The TopIntroPreference shows a text which describe a feature. Gernerally, we expect this
+ * preference always shows on the top of screen.
+ */
+public class TopIntroPreference extends Preference {
+
+    public TopIntroPreference(Context context) {
+        super(context);
+        setLayoutResource(R.layout.top_intro_preference);
+        setSelectable(false);
+    }
+
+    public TopIntroPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        setLayoutResource(R.layout.top_intro_preference);
+        setSelectable(false);
+    }
+
+    @Override
+    public void onBindViewHolder(PreferenceViewHolder holder) {
+        super.onBindViewHolder(holder);
+        holder.setDividerAllowedAbove(true);
+        holder.setDividerAllowedBelow(true);
+    }
+}