[Material Next] Update accessibility tool footer style

1. Implement API extends Material Next FooterBarPreference and support Accessibility API for icons
2. Apply solutions to accessibility tools and framework tools in
accessibility settings page.
3. Apply DashboardFragment for Caption preference for xml parser

Bug: 185973304
Test: make RunSettingsRoboTests -j52
Change-Id: I6b80bc80190d6666e3fbcd462442a9f2c0e60bba

res/xml/accessibility_autoclick_settings.xml

@@ -60,10 +60,11 @@
         settings:allowDividerBelow="true"
         settings:controller="com.android.settings.accessibility.ToggleAutoclickCustomSeekbarController" />
 
-    <com.android.settingslib.widget.FooterPreference
-        android:key="autoclick_footer"
+    <com.android.settings.accessibility.AccessibilityFooterPreference
+        android:key="accessibility_autoclick_footer"
         android:title="@string/accessibility_autoclick_description"
+        android:persistent="false"
         android:selectable="false"
-        settings:searchable="false" />
-
+        settings:searchable="false"
+        settings:controller="com.android.settings.accessibility.ToggleAutoclickFooterPreferenceController"/>
 </PreferenceScreen>

res/xml/accessibility_button_settings.xml

@@ -59,11 +59,11 @@
         android:persistent="false"
         settings:controller="com.android.settings.accessibility.FloatingMenuOpacityPreferenceController"/>
 
-    <com.android.settingslib.widget.FooterPreference
+    <com.android.settings.accessibility.AccessibilityFooterPreference
         android:key="accessibility_button_footer"
         android:title="@string/accessibility_button_description"
+        android:persistent="false"
         android:selectable="false"
         settings:searchable="false"
-        android:persistent="false"/>
-
-</PreferenceScreen>
+        settings:controller="com.android.settings.accessibility.AccessibilityButtonFooterPreferenceController"/>
+</PreferenceScreen>

res/xml/accessibility_control_timeout_settings.xml

@@ -55,8 +55,11 @@
         android:title="@string/accessibility_timeout_2mins"
         android:persistent="false" />
 
-    <com.android.settingslib.widget.FooterPreference
+    <com.android.settings.accessibility.AccessibilityFooterPreference
+        android:key="accessibility_control_timeout_footer"
         android:title="@string/accessibility_control_timeout_preference_summary"
-        android:selectable="false" />
-
+        android:persistent="false"
+        android:selectable="false"
+        settings:searchable="false"
+        settings:controller="com.android.settings.accessibility.AccessibilityControlTimeoutFooterPreferenceController"/>
 </PreferenceScreen>

res/xml/captioning_appearance.xml

@@ -87,8 +87,11 @@
 
     </PreferenceCategory>
 
-    <com.android.settingslib.widget.FooterPreference
+    <com.android.settings.accessibility.AccessibilityFooterPreference
+        android:key="captioning_appearance_footer"
         android:title="@string/accessibility_caption_preference_summary"
-        android:selectable="false"/>
-
+        android:persistent="false"
+        android:selectable="false"
+        settings:searchable="false"
+        settings:controller="com.android.settings.accessibility.CaptionFooterPreferenceController"/>
 </PreferenceScreen>

res/xml/captioning_more_options.xml

@@ -25,8 +25,12 @@
         android:summary="%s"
         android:title="@string/captioning_locale" />
 
-    <com.android.settingslib.widget.FooterPreference
+    <com.android.settings.accessibility.AccessibilityFooterPreference
+        android:key="captioning_more_options_footer"
         android:title="@string/accessibility_caption_preference_summary"
-        android:selectable="false" />
+        android:persistent="false"
+        android:selectable="false"
+        settings:searchable="false"
+        settings:controller="com.android.settings.accessibility.CaptionFooterPreferenceController"/>
 
 </PreferenceScreen>

res/xml/captioning_settings.xml

@@ -47,10 +47,12 @@
         android:persistent="false"
         android:title="@string/captioning_more_options_title" />
 
-    <com.android.settingslib.widget.FooterPreference
+    <com.android.settings.accessibility.AccessibilityFooterPreference
+        android:key="captioning_settings_footer"
+        android:title="@string/accessibility_caption_preference_summary"
         android:persistent="false"
         android:selectable="false"
-        android:title="@string/accessibility_caption_preference_summary"
-        settings:searchable="false"/>
+        settings:searchable="false"
+        settings:controller="com.android.settings.accessibility.CaptionFooterPreferenceController"/>
 
 </PreferenceScreen>

src/com/android/settings/accessibility/AccessibilityButtonFooterPreferenceController.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2021 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.settings.accessibility;
+
+import android.content.Context;
+
+import com.android.settings.R;
+
+/**
+ * Preference controller for accessibility button footer.
+ */
+public class AccessibilityButtonFooterPreferenceController extends
+        AccessibilityFooterPreferenceController {
+
+    public AccessibilityButtonFooterPreferenceController(Context context, String key) {
+        super(context, key);
+    }
+
+    @Override
+    protected String getLabelName() {
+        return mContext.getString(R.string.accessibility_button_title);
+    }
+}

src/com/android/settings/accessibility/AccessibilityButtonFragment.java

@@ -17,7 +17,6 @@
 package com.android.settings.accessibility;
 
 import android.app.settings.SettingsEnums;
-import android.content.Context;
 
 import com.android.settings.R;
 import com.android.settings.dashboard.DashboardFragment;
@@ -35,11 +34,6 @@ public class AccessibilityButtonFragment extends DashboardFragment {
         return R.xml.accessibility_button_settings;
     }
 
-    @Override
-    public void onAttach(Context context) {
-        super.onAttach(context);
-    }
-
     @Override
     protected String getLogTag() {
         return TAG;

src/com/android/settings/accessibility/AccessibilityControlTimeoutFooterPreferenceController.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2021 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.settings.accessibility;
+
+import android.content.Context;
+
+import com.android.settings.R;
+
+/**
+ * Preference controller for accessibility control timeout footer.
+ */
+public class AccessibilityControlTimeoutFooterPreferenceController extends
+        AccessibilityFooterPreferenceController {
+
+    public AccessibilityControlTimeoutFooterPreferenceController(Context context, String key) {
+        super(context, key);
+    }
+
+    @Override
+    protected String getLabelName() {
+        return mContext.getString(R.string.accessibility_setting_item_control_timeout_title);
+    }
+}

src/com/android/settings/accessibility/AccessibilityFooterPreference.java

@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2021 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.settings.accessibility;
+
+import android.content.Context;
+import android.text.TextUtils;
+import android.text.method.LinkMovementMethod;
+import android.util.AttributeSet;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import androidx.preference.PreferenceViewHolder;
+
+import com.android.settingslib.R;
+import com.android.settingslib.widget.FooterPreference;
+
+/**
+ * A custom preference acting as footer of a page. It has a field for icon and text. It is added
+ * to screen as the last preference and groups of icon and text content in accessibility-focusable
+ * {@link android.view.accessibility.AccessibilityNodeInfo} for TalkBack to use.
+ */
+public final class AccessibilityFooterPreference extends FooterPreference {
+
+    private CharSequence mIconContentDescription;
+    private boolean mLinkEnabled;
+
+    public AccessibilityFooterPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public AccessibilityFooterPreference(Context context) {
+        super(context);
+    }
+
+    @Override
+    public void onBindViewHolder(PreferenceViewHolder holder) {
+        super.onBindViewHolder(holder);
+
+        final TextView title = holder.itemView.findViewById(android.R.id.title);
+        if (mLinkEnabled) {
+            // When a TextView has a movement method, it will set the view to clickable. This makes
+            // View.onTouchEvent always return true and consumes the touch event, essentially
+            // nullifying any return values of MovementMethod.onTouchEvent.
+            // To still allow propagating touch events to the parent when this view doesn't have
+            // links, we only set the movement method here if the text contains links.
+            title.setMovementMethod(LinkMovementMethod.getInstance());
+        } else {
+            title.setMovementMethod(/* movement= */ null);
+        }
+
+        final LinearLayout infoFrame = holder.itemView.findViewById(R.id.icon_frame);
+        if (!TextUtils.isEmpty(mIconContentDescription)) {
+            // Groups related content.
+            infoFrame.setContentDescription(mIconContentDescription);
+            title.setFocusable(false);
+        } else {
+            infoFrame.setContentDescription(null);
+            title.setFocusable(true);
+        }
+    }
+
+    /**
+     * Sets the content description of the icon.
+     */
+    public void setIconContentDescription(CharSequence iconContentDescription) {
+        if (!TextUtils.equals(iconContentDescription, mIconContentDescription)) {
+            mIconContentDescription = iconContentDescription;
+            notifyChanged();
+        }
+    }
+
+    /**
+     * Gets the content description of the icon.
+     */
+    public CharSequence getIconContentDescription() {
+        return mIconContentDescription;
+    }
+
+    /**
+     * Sets the title field supports movement method.
+     */
+    public void setLinkEnabled(boolean enabled) {
+        if (mLinkEnabled != enabled) {
+            mLinkEnabled = enabled;
+            notifyChanged();
+        }
+    }
+
+    /**
+     * Returns true if the title field supports movement method.
+     */
+    public boolean isLinkEnabled() {
+        return mLinkEnabled;
+    }
+}

src/com/android/settings/accessibility/AccessibilityFooterPreferenceController.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2021 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.settings.accessibility;
+
+import android.content.Context;
+
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+/**
+ * Base class for accessibility preference footer.
+ */
+public abstract class AccessibilityFooterPreferenceController extends BasePreferenceController {
+
+    public AccessibilityFooterPreferenceController(Context context, String key) {
+        super(context, key);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+
+        final AccessibilityFooterPreference footerPreference =
+                screen.findPreference(getPreferenceKey());
+        updateFooterPreferences(footerPreference);
+    }
+
+
+    /** Returns the accessibility feature name. */
+    protected abstract String getLabelName();
+
+    private void updateFooterPreferences(AccessibilityFooterPreference footerPreference) {
+        final String iconContentDescription = mContext.getString(
+                R.string.accessibility_introduction_title, getLabelName());
+        footerPreference.setIconContentDescription(iconContentDescription);
+    }
+}

src/com/android/settings/accessibility/CaptionAppearanceFragment.java

@@ -33,8 +33,8 @@ import androidx.preference.PreferenceCategory;
 
 import com.android.internal.widget.SubtitleView;
 import com.android.settings.R;
-import com.android.settings.SettingsPreferenceFragment;
 import com.android.settings.accessibility.ListDialogPreference.OnValueChangedListener;
+import com.android.settings.dashboard.DashboardFragment;
 import com.android.settings.search.BaseSearchIndexProvider;
 import com.android.settingslib.accessibility.AccessibilityUtils;
 import com.android.settingslib.search.SearchIndexable;
@@ -46,8 +46,10 @@ import java.util.Locale;
 
 /** Settings fragment containing font style of captioning properties. */
 @SearchIndexable(forTarget = SearchIndexable.ALL & ~SearchIndexable.ARC)
-public class CaptionAppearanceFragment extends SettingsPreferenceFragment
+public class CaptionAppearanceFragment extends DashboardFragment
         implements OnPreferenceChangeListener, OnValueChangedListener {
+
+    private static final String TAG = "CaptionAppearanceFragment";
     private static final String PREF_CAPTION_PREVIEW = "caption_preview";
     private static final String PREF_BACKGROUND_COLOR = "captioning_background_color";
     private static final String PREF_BACKGROUND_OPACITY = "captioning_background_opacity";
@@ -107,12 +109,11 @@ public class CaptionAppearanceFragment extends SettingsPreferenceFragment
     }
 
     @Override
-    public void onCreate(Bundle icicle) {
-        super.onCreate(icicle);
+    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+        super.onCreatePreferences(savedInstanceState, rootKey);
 
         mCaptioningManager = (CaptioningManager) getSystemService(Context.CAPTIONING_SERVICE);
 
-        addPreferencesFromResource(R.xml.captioning_appearance);
         initializeAllPreferences();
         updateAllPreferences();
         refreshShowingCustom();
@@ -120,6 +121,16 @@ public class CaptionAppearanceFragment extends SettingsPreferenceFragment
         refreshPreviewText();
     }
 
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.captioning_appearance;
+    }
+
+    @Override
+    protected String getLogTag() {
+        return TAG;
+    }
+
     private void refreshPreviewText() {
         final Context context = getActivity();
         if (context == null) {

src/com/android/settings/accessibility/CaptionFooterPreferenceController.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2021 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.settings.accessibility;
+
+import android.content.Context;
+
+import com.android.settings.R;
+
+/**
+ * Preference controller for caption footer.
+ */
+public class CaptionFooterPreferenceController extends AccessibilityFooterPreferenceController {
+
+    public CaptionFooterPreferenceController(Context context, String key) {
+        super(context, key);
+    }
+
+    @Override
+    protected String getLabelName() {
+        return mContext.getString(R.string.accessibility_captioning_title);
+    }
+}

src/com/android/settings/accessibility/CaptionMoreOptionsFragment.java

@@ -26,18 +26,19 @@ import android.view.accessibility.CaptioningManager;
 import androidx.preference.Preference;
 
 import com.android.settings.R;
-import com.android.settings.SettingsPreferenceFragment;
+import com.android.settings.dashboard.DashboardFragment;
 import com.android.settings.search.BaseSearchIndexProvider;
 import com.android.settingslib.search.SearchIndexable;
 
 /** Settings fragment containing more options of captioning properties. */
 @SearchIndexable(forTarget = SearchIndexable.ALL & ~SearchIndexable.ARC)
-public class CaptionMoreOptionsFragment extends SettingsPreferenceFragment
+public class CaptionMoreOptionsFragment extends DashboardFragment
         implements Preference.OnPreferenceChangeListener {
+
+    private static final String TAG = "CaptionMoreOptionsFragment";
     private static final String PREF_LOCALE = "captioning_locale";
 
     private CaptioningManager mCaptioningManager;
-
     private LocalePreference mLocale;
 
     @Override
@@ -46,17 +47,26 @@ public class CaptionMoreOptionsFragment extends SettingsPreferenceFragment
     }
 
     @Override
-    public void onCreate(Bundle icicle) {
-        super.onCreate(icicle);
+    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+        super.onCreatePreferences(savedInstanceState, rootKey);
 
         mCaptioningManager = (CaptioningManager) getSystemService(Context.CAPTIONING_SERVICE);
 
-        addPreferencesFromResource(R.xml.captioning_more_options);
         initializeAllPreferences();
         updateAllPreferences();
         installUpdateListeners();
     }
 
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.captioning_more_options;
+    }
+
+    @Override
+    protected String getLogTag() {
+        return TAG;
+    }
+
     private void initializeAllPreferences() {
         mLocale = (LocalePreference) findPreference(PREF_LOCALE);
     }

src/com/android/settings/accessibility/CaptionPropertiesFragment.java

@@ -28,7 +28,7 @@ import androidx.preference.Preference;
 import androidx.preference.Preference.OnPreferenceChangeListener;
 
 import com.android.settings.R;
-import com.android.settings.SettingsPreferenceFragment;
+import com.android.settings.dashboard.DashboardFragment;
 import com.android.settings.search.BaseSearchIndexProvider;
 import com.android.settings.widget.SettingsMainSwitchPreference;
 import com.android.settingslib.search.SearchIndexable;
@@ -41,8 +41,10 @@ import java.util.List;
 
 /** Settings fragment containing captioning properties. */
 @SearchIndexable(forTarget = SearchIndexable.ALL & ~SearchIndexable.ARC)
-public class CaptionPropertiesFragment extends SettingsPreferenceFragment
+public class CaptionPropertiesFragment extends DashboardFragment
         implements OnPreferenceChangeListener, OnMainSwitchChangeListener {
+
+    private static final String TAG = "CaptionPropertiesFragment";
     private static final String PREF_SWITCH = "captioning_preference_switch";
     private static final String PREF_TEXT = "captioning_caption_appearance";
     private static final String PREF_MORE = "captioning_more_options";
@@ -62,12 +64,11 @@ public class CaptionPropertiesFragment extends SettingsPreferenceFragment
     }
 
     @Override
-    public void onCreate(Bundle icicle) {
-        super.onCreate(icicle);
+    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+        super.onCreatePreferences(savedInstanceState, rootKey);
 
         mCaptioningManager = (CaptioningManager) getSystemService(Context.CAPTIONING_SERVICE);
 
-        addPreferencesFromResource(R.xml.captioning_settings);
         initializeAllPreferences();
         installUpdateListeners();
         initFontSizeValuesArray();
@@ -79,6 +80,16 @@ public class CaptionPropertiesFragment extends SettingsPreferenceFragment
         updateAllPreferences();
     }
 
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.captioning_settings;
+    }
+
+    @Override
+    protected String getLogTag() {
+        return TAG;
+    }
+
     private void initializeAllPreferences() {
         mSwitch = (SettingsMainSwitchPreference) findPreference(PREF_SWITCH);
         mTextAppearance = (Preference) findPreference(PREF_TEXT);

src/com/android/settings/accessibility/ToggleAutoclickFooterPreferenceController.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2021 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.settings.accessibility;
+
+import android.content.Context;
+
+import com.android.settings.R;
+
+/**
+ * Preference controller for accessibility autoclick footer.
+ */
+public class ToggleAutoclickFooterPreferenceController extends
+        AccessibilityFooterPreferenceController {
+
+    public ToggleAutoclickFooterPreferenceController(Context context, String key) {
+        super(context, key);
+    }
+
+    @Override
+    protected String getLabelName() {
+        return mContext.getString(R.string.accessibility_autoclick_preference_title);
+    }
+}

src/com/android/settings/accessibility/ToggleDaltonizerPreferenceFragment.java

@@ -107,7 +107,7 @@ public final class ToggleDaltonizerPreferenceFragment extends ToggleFeaturePrefe
         lists.add(KEY_PREVIEW);
         lists.add(KEY_CATEGORY_MODE);
         lists.add(KEY_GENERAL_CATEGORY);
-        lists.add(KEY_INTRODUCTION_CATEGORY);
+        lists.add(KEY_HTML_DESCRIPTION_PREFERENCE);
         return lists;
     }
 

src/com/android/settings/accessibility/ToggleFeaturePreferenceFragment.java

@@ -54,7 +54,6 @@ import com.android.settings.accessibility.AccessibilityUtil.UserShortcutType;
 import com.android.settings.widget.SettingsMainSwitchBar;
 import com.android.settings.widget.SettingsMainSwitchPreference;
 import com.android.settingslib.accessibility.AccessibilityUtils;
-import com.android.settingslib.widget.FooterPreference;
 import com.android.settingslib.widget.OnMainSwitchChangeListener;
 
 import java.lang.annotation.Retention;
@@ -87,7 +86,7 @@ public abstract class ToggleFeaturePreferenceFragment extends SettingsPreference
     private static final String DRAWABLE_FOLDER = "drawable";
     protected static final String KEY_USE_SERVICE_PREFERENCE = "use_service";
     protected static final String KEY_GENERAL_CATEGORY = "general_categories";
-    protected static final String KEY_INTRODUCTION_CATEGORY = "introduction_categories";
+    protected static final String KEY_HTML_DESCRIPTION_PREFERENCE = "html_description";
     private static final String KEY_SHORTCUT_PREFERENCE = "shortcut_preference";
     protected static final String KEY_SAVED_USER_SHORTCUT_TYPE = "shortcut_type";
     protected static final String KEY_ANIMATED_IMAGE = "animated_image";
@@ -383,7 +382,7 @@ public abstract class ToggleFeaturePreferenceFragment extends SettingsPreference
         lists.add(KEY_USE_SERVICE_PREFERENCE);
         lists.add(KEY_ANIMATED_IMAGE);
         lists.add(KEY_GENERAL_CATEGORY);
-        lists.add(KEY_INTRODUCTION_CATEGORY);
+        lists.add(KEY_HTML_DESCRIPTION_PREFERENCE);
         return lists;
     }
 
@@ -495,44 +494,57 @@ public abstract class ToggleFeaturePreferenceFragment extends SettingsPreference
         generalCategory.addPreference(mSettingsPreference);
     }
 
-    private void initIntroductionCategory() {
-        final PreferenceCategory introductionCategory = new PreferenceCategory(getPrefContext());
-        final CharSequence title =
-                getString(R.string.accessibility_introduction_title, mPackageName);
-        introductionCategory.setKey(KEY_INTRODUCTION_CATEGORY);
-        introductionCategory.setTitle(title);
-
-        getPreferenceScreen().addPreference(introductionCategory);
-    }
-
     private void initHtmlTextPreference() {
         if (TextUtils.isEmpty(mHtmlDescription)) {
             return;
         }
+        final PreferenceScreen screen = getPreferenceScreen();
+        final CharSequence htmlDescription = Html.fromHtml(mHtmlDescription.toString(),
+                Html.FROM_HTML_MODE_COMPACT, mImageGetter, /* tagHandler= */ null);
+        final String iconContentDescription =
+                getString(R.string.accessibility_introduction_title, mPackageName);
 
-        initIntroductionCategory();
-
-        final HtmlTextPreference htmlTextPreference = new HtmlTextPreference(getPrefContext());
-        htmlTextPreference.setSummary(mHtmlDescription);
-        htmlTextPreference.setImageGetter(mImageGetter);
-        htmlTextPreference.setSelectable(false);
-
-        final PreferenceCategory introductionCategory = findPreference(KEY_INTRODUCTION_CATEGORY);
-        introductionCategory.addPreference(htmlTextPreference);
+        final AccessibilityFooterPreference htmlFooterPreference =
+                new AccessibilityFooterPreference(screen.getContext());
+        htmlFooterPreference.setKey(KEY_HTML_DESCRIPTION_PREFERENCE);
+        htmlFooterPreference.setSummary(htmlDescription);
+        htmlFooterPreference.setLinkEnabled(false);
+        htmlFooterPreference.setIconContentDescription(iconContentDescription);
+        screen.addPreference(htmlFooterPreference);
     }
 
     private void initFooterPreference() {
         if (!TextUtils.isEmpty(mDescription)) {
-            createFooterPreference(mDescription);
+            createFooterPreference(getPreferenceScreen(), mDescription,
+                    getString(R.string.accessibility_introduction_title, mPackageName));
         }
 
         if (TextUtils.isEmpty(mHtmlDescription) && TextUtils.isEmpty(mDescription)) {
             final CharSequence defaultDescription =
                     getText(R.string.accessibility_service_default_description);
-            createFooterPreference(defaultDescription);
+            createFooterPreference(getPreferenceScreen(), defaultDescription,
+                    getString(R.string.accessibility_introduction_title, mPackageName));
         }
     }
 
+
+    /**
+     * Creates {@link AccessibilityFooterPreference} and append into {@link PreferenceScreen}
+     *
+     * @param screen The preference screen to add the footer preference
+     * @param summary The summary of the preference summary.
+     * @param iconContentDescription The content description of icon in the footer.
+     */
+    @VisibleForTesting
+    void createFooterPreference(PreferenceScreen screen, CharSequence summary,
+            String iconContentDescription) {
+        final AccessibilityFooterPreference footerPreference =
+                new AccessibilityFooterPreference(screen.getContext());
+        footerPreference.setSummary(summary);
+        footerPreference.setIconContentDescription(iconContentDescription);
+        screen.addPreference(footerPreference);
+    }
+
     @VisibleForTesting
     void setupEditShortcutDialog(Dialog dialog) {
         final View dialogSoftwareView = dialog.findViewById(R.id.software_shortcut);
@@ -707,12 +719,6 @@ public abstract class ToggleFeaturePreferenceFragment extends SettingsPreference
         showDialog(DialogEnums.EDIT_SHORTCUT);
     }
 
-    private void createFooterPreference(CharSequence title) {
-        final PreferenceScreen preferenceScreen = getPreferenceScreen();
-        preferenceScreen.addPreference(new FooterPreference.Builder(getActivity()).setTitle(
-                title).build());
-    }
-
     /**
      * Setups a configurable default if the setting has never been set.
      */

tests/robotests/src/com/android/settings/accessibility/AccessibilityButtonFooterPreferenceControllerTest.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2021 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.settings.accessibility;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+
+import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceScreen;
+import androidx.test.core.app.ApplicationProvider;
+
+import com.android.settings.R;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+
+/** Tests for {@link AccessibilityButtonFooterPreferenceController}. */
+@RunWith(RobolectricTestRunner.class)
+public class AccessibilityButtonFooterPreferenceControllerTest {
+
+    private static final String TEST_KEY = "test_key";
+    private final Context mContext = ApplicationProvider.getApplicationContext();
+    private PreferenceScreen mScreen;
+    private AccessibilityButtonFooterPreferenceController mController;
+
+    @Before
+    public void setUp() {
+        final PreferenceManager preferenceManager = new PreferenceManager(mContext);
+        mScreen = preferenceManager.createPreferenceScreen(mContext);
+        final AccessibilityFooterPreference footerPreference =
+                new AccessibilityFooterPreference(mContext);
+        footerPreference.setKey(TEST_KEY);
+        mScreen.addPreference(footerPreference);
+        mController = new AccessibilityButtonFooterPreferenceController(mContext, TEST_KEY);
+    }
+
+    @Test
+    public void onPreferenceChange_shouldSetCorrectIconContentDescription() {
+        mController.displayPreference(mScreen);
+
+        final AccessibilityFooterPreference footerPreference = mScreen.findPreference(TEST_KEY);
+        final String packageName = mContext.getString(R.string.accessibility_button_title);
+        final String iconContentDescription = mContext.getString(
+                R.string.accessibility_introduction_title,
+                packageName);
+        assertThat(footerPreference.getIconContentDescription()).isEqualTo(iconContentDescription);
+    }
+}

tests/robotests/src/com/android/settings/accessibility/AccessibilityControlTimeoutFooterPreferenceControllerTest.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2021 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.settings.accessibility;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+
+import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceScreen;
+import androidx.test.core.app.ApplicationProvider;
+
+import com.android.settings.R;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+
+/** Tests for {@link AccessibilityControlTimeoutFooterPreferenceController}. */
+@RunWith(RobolectricTestRunner.class)
+public class AccessibilityControlTimeoutFooterPreferenceControllerTest {
+
+    private static final String TEST_KEY = "test_key";
+    private final Context mContext = ApplicationProvider.getApplicationContext();
+    private PreferenceScreen mScreen;
+    private AccessibilityControlTimeoutFooterPreferenceController mController;
+
+    @Before
+    public void setUp() {
+        final PreferenceManager preferenceManager = new PreferenceManager(mContext);
+        mScreen = preferenceManager.createPreferenceScreen(mContext);
+        final AccessibilityFooterPreference footerPreference =
+                new AccessibilityFooterPreference(mContext);
+        footerPreference.setKey(TEST_KEY);
+        mScreen.addPreference(footerPreference);
+        mController = new AccessibilityControlTimeoutFooterPreferenceController(mContext, TEST_KEY);
+    }
+
+    @Test
+    public void onPreferenceChange_shouldSetCorrectIconContentDescription() {
+        mController.displayPreference(mScreen);
+
+        final AccessibilityFooterPreference footerPreference =
+                mScreen.findPreference(TEST_KEY);
+        final String packageName =
+                mContext.getString(R.string.accessibility_setting_item_control_timeout_title);
+        final String iconContentDescription = mContext.getString(
+                R.string.accessibility_introduction_title,
+                packageName);
+        assertThat(footerPreference.getIconContentDescription()).isEqualTo(iconContentDescription);
+    }
+}

tests/robotests/src/com/android/settings/accessibility/AccessibilityFooterPreferenceTest.java

@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2019 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.settings.accessibility;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import androidx.preference.PreferenceViewHolder;
+
+import com.android.settingslib.R;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+
+/** Tests for {@link AccessibilityFooterPreference} */
+@RunWith(RobolectricTestRunner.class)
+public final class AccessibilityFooterPreferenceTest {
+
+    private static final String DEFAULT_SUMMARY = "default summary";
+    private static final String DEFAULT_DESCRIPTION = "default description";
+
+    private AccessibilityFooterPreference mAccessibilityFooterPreference;
+    private PreferenceViewHolder mPreferenceViewHolder;
+
+    @Before
+    public void setUp() {
+        final Context context = RuntimeEnvironment.application;
+        mAccessibilityFooterPreference = new AccessibilityFooterPreference(context);
+
+        final LayoutInflater inflater = LayoutInflater.from(context);
+        final View view =
+                inflater.inflate(R.layout.preference_footer, null);
+        mPreferenceViewHolder = PreferenceViewHolder.createInstanceForTests(view);
+    }
+
+    @Test
+    public void onBindViewHolder_initTextConfig_parseTextAndFocusable() {
+        mAccessibilityFooterPreference.setSummary(DEFAULT_SUMMARY);
+
+        mAccessibilityFooterPreference.onBindViewHolder(mPreferenceViewHolder);
+
+        final TextView summaryView = (TextView) mPreferenceViewHolder.findViewById(
+                android.R.id.title);
+        assertThat(summaryView.getText().toString()).isEqualTo(DEFAULT_SUMMARY);
+        assertThat(summaryView.isFocusable()).isEqualTo(true);
+    }
+
+    @Test
+    public void onBindViewHolder_initTextConfigAndAccessibleIcon_groupContentForAccessible() {
+        mAccessibilityFooterPreference.setSummary(DEFAULT_SUMMARY);
+        mAccessibilityFooterPreference.setIconContentDescription(DEFAULT_DESCRIPTION);
+
+        mAccessibilityFooterPreference.onBindViewHolder(mPreferenceViewHolder);
+
+        final TextView summaryView = (TextView) mPreferenceViewHolder.findViewById(
+                android.R.id.title);
+        assertThat(summaryView.getText().toString()).isEqualTo(DEFAULT_SUMMARY);
+        assertThat(summaryView.isFocusable()).isEqualTo(false);
+        final LinearLayout infoFrame = (LinearLayout) mPreferenceViewHolder.findViewById(
+                R.id.icon_frame);
+        assertThat(infoFrame.getContentDescription()).isEqualTo(DEFAULT_DESCRIPTION);
+        assertThat(infoFrame.isFocusable()).isEqualTo(false);
+    }
+}

tests/robotests/src/com/android/settings/accessibility/CaptionFooterPreferenceControllerTest.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2021 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.settings.accessibility;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+
+import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceScreen;
+import androidx.test.core.app.ApplicationProvider;
+
+import com.android.settings.R;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+
+/** Tests for {@link CaptionFooterPreferenceController}. */
+@RunWith(RobolectricTestRunner.class)
+public class CaptionFooterPreferenceControllerTest {
+
+    private static final String TEST_KEY = "test_key";
+    private final Context mContext = ApplicationProvider.getApplicationContext();
+    private PreferenceScreen mScreen;
+    private CaptionFooterPreferenceController mController;
+
+    @Before
+    public void setUp() {
+        final PreferenceManager preferenceManager = new PreferenceManager(mContext);
+        mScreen = preferenceManager.createPreferenceScreen(mContext);
+        final AccessibilityFooterPreference footerPreference =
+                new AccessibilityFooterPreference(mContext);
+        footerPreference.setKey(TEST_KEY);
+        mScreen.addPreference(footerPreference);
+        mController = new CaptionFooterPreferenceController(mContext, TEST_KEY);
+    }
+
+    @Test
+    public void onPreferenceChange_shouldSetCorrectIconContentDescription() {
+        mController.displayPreference(mScreen);
+
+        final AccessibilityFooterPreference footerPreference = mScreen.findPreference(TEST_KEY);
+        final String packageName = mContext.getString(R.string.accessibility_captioning_title);
+        final String iconContentDescription = mContext.getString(
+                R.string.accessibility_introduction_title,
+                packageName);
+        assertThat(footerPreference.getIconContentDescription()).isEqualTo(iconContentDescription);
+    }
+}

tests/robotests/src/com/android/settings/accessibility/ToggleAutoclickFooterPreferenceControllerTest.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2021 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.settings.accessibility;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+
+import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceScreen;
+import androidx.test.core.app.ApplicationProvider;
+
+import com.android.settings.R;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+
+/** Tests for {@link ToggleAutoclickFooterPreferenceController}. */
+@RunWith(RobolectricTestRunner.class)
+public class ToggleAutoclickFooterPreferenceControllerTest {
+
+    private static final String TEST_KEY = "test_key";
+    private final Context mContext = ApplicationProvider.getApplicationContext();
+    private PreferenceScreen mScreen;
+    private ToggleAutoclickFooterPreferenceController mController;
+
+    @Before
+    public void setUp() {
+        final PreferenceManager preferenceManager = new PreferenceManager(mContext);
+        mScreen = preferenceManager.createPreferenceScreen(mContext);
+        final AccessibilityFooterPreference footerPreference =
+                new AccessibilityFooterPreference(mContext);
+        footerPreference.setKey(TEST_KEY);
+        mScreen.addPreference(footerPreference);
+        mController = new ToggleAutoclickFooterPreferenceController(mContext, TEST_KEY);
+    }
+
+    @Test
+    public void onPreferenceChange_shouldSetCorrectIconContentDescription() {
+        mController.displayPreference(mScreen);
+
+        final AccessibilityFooterPreference footerPreference = mScreen.findPreference(TEST_KEY);
+        final String packageName = mContext.getString(
+                R.string.accessibility_autoclick_preference_title);
+        final String iconContentDescription = mContext.getString(
+                R.string.accessibility_introduction_title,
+                packageName);
+        assertThat(footerPreference.getIconContentDescription()).isEqualTo(iconContentDescription);
+    }
+}

tests/robotests/src/com/android/settings/accessibility/ToggleFeaturePreferenceFragmentTest.java

@@ -39,6 +39,7 @@ import androidx.annotation.XmlRes;
 import androidx.appcompat.app.AlertDialog;
 import androidx.fragment.app.FragmentActivity;
 import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceScreen;
 import androidx.test.core.app.ApplicationProvider;
 
 import com.android.settings.R;
@@ -48,6 +49,7 @@ import com.android.settings.testutils.shadow.ShadowFragment;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.mockito.Answers;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 import org.robolectric.RobolectricTestRunner;
@@ -63,6 +65,8 @@ public class ToggleFeaturePreferenceFragmentTest {
     private static final ComponentName PLACEHOLDER_COMPONENT_NAME = new ComponentName(
             PLACEHOLDER_PACKAGE_NAME, PLACEHOLDER_CLASS_NAME);
     private static final String PLACEHOLDER_DIALOG_TITLE = "title";
+    private static final String DEFAULT_SUMMARY = "default summary";
+    private static final String DEFAULT_DESCRIPTION = "default description";
 
     private static final String SOFTWARE_SHORTCUT_KEY =
             Settings.Secure.ACCESSIBILITY_BUTTON_TARGETS;
@@ -70,9 +74,10 @@ public class ToggleFeaturePreferenceFragmentTest {
             Settings.Secure.ACCESSIBILITY_SHORTCUT_TARGET_SERVICE;
 
     private TestToggleFeaturePreferenceFragment mFragment;
+    private PreferenceScreen mScreen;
     private Context mContext = ApplicationProvider.getApplicationContext();
 
-    @Mock
+    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
     private PreferenceManager mPreferenceManager;
 
     @Before
@@ -83,7 +88,9 @@ public class ToggleFeaturePreferenceFragmentTest {
         when(mFragment.getPreferenceManager()).thenReturn(mPreferenceManager);
         when(mFragment.getPreferenceManager().getContext()).thenReturn(mContext);
         when(mFragment.getContext()).thenReturn(mContext);
-        doReturn(null).when(mFragment).getPreferenceScreen();
+        mScreen = spy(new PreferenceScreen(mContext, null));
+        when(mScreen.getPreferenceManager()).thenReturn(mPreferenceManager);
+        doReturn(mScreen).when(mFragment).getPreferenceScreen();
     }
 
     @Test
@@ -195,6 +202,21 @@ public class ToggleFeaturePreferenceFragmentTest {
         assertThat(expectedType).isEqualTo(UserShortcutType.SOFTWARE | UserShortcutType.HARDWARE);
     }
 
+    @Test
+    public void createFooterPreference_shouldSetAsExpectedValue() {
+        mFragment.createFooterPreference(mFragment.getPreferenceScreen(),
+                DEFAULT_SUMMARY, DEFAULT_DESCRIPTION);
+
+        AccessibilityFooterPreference accessibilityFooterPreference =
+                (AccessibilityFooterPreference) mFragment.getPreferenceScreen().getPreference(
+                        mFragment.getPreferenceScreen().getPreferenceCount() - 1);
+        assertThat(accessibilityFooterPreference.getSummary()).isEqualTo(DEFAULT_SUMMARY);
+        assertThat(accessibilityFooterPreference.getIconContentDescription()).isEqualTo(
+                DEFAULT_DESCRIPTION);
+        assertThat(accessibilityFooterPreference.isSelectable()).isEqualTo(true);
+        assertThat(accessibilityFooterPreference.getOrder()).isEqualTo(Integer.MAX_VALUE - 1);
+    }
+
     private void putStringIntoSettings(String key, String componentName) {
         Settings.Secure.putString(mContext.getContentResolver(), key, componentName);
     }