Support accessibility for battery usage in U (1)

Fix b/265746746: TalkBack doesn't have any feedback after the actual double-tap of day bar and bi-hourly bar.

When users double clicked a time slot in battery usage chart with TalkBack on, jump the accessibility focus to the app list category title to let users know what happened after click.

screen record: https://drive.google.com/file/d/1ZuKQDBiTA2F8hHZDFvNx5nJEP-rMA0eZ/view?usp=sharing&resourcekey=0-2Q552VNxN4QwI2b5sdnvqg

Bug: 265746746
Fix: 265746746
Test: manual
Change-Id: I5485e714149014a96318fd88e8f8c854dde6cb67

res/xml/power_usage_advanced.xml

@@ -38,7 +38,7 @@
 
     </PreferenceCategory>
 
-    <PreferenceCategory
+    <com.android.settings.fuelgauge.batteryusage.AccessibilityFocusablePreferenceCategory
         android:key="battery_usage_breakdown"
         settings:controller=
             "com.android.settings.fuelgauge.batteryusage.BatteryUsageBreakdownController"
@@ -58,5 +58,5 @@
             settings:isPreferenceVisible="false"
             settings:searchable="false" />
 
-    </PreferenceCategory>
+    </com.android.settings.fuelgauge.batteryusage.AccessibilityFocusablePreferenceCategory>
 </PreferenceScreen>

src/com/android/settings/fuelgauge/batteryusage/AccessibilityFocusablePreferenceCategory.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2023 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.fuelgauge.batteryusage;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.accessibility.AccessibilityManager;
+
+import androidx.preference.PreferenceCategory;
+import androidx.preference.PreferenceViewHolder;
+
+/**
+ * Preference category that supports requesting accessibility focus.
+ */
+public class AccessibilityFocusablePreferenceCategory extends PreferenceCategory {
+    private PreferenceViewHolder mView;
+
+    public AccessibilityFocusablePreferenceCategory(Context context, AttributeSet attrs,
+            int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+    }
+
+    public AccessibilityFocusablePreferenceCategory(Context context, AttributeSet attrs,
+            int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    public AccessibilityFocusablePreferenceCategory(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public AccessibilityFocusablePreferenceCategory(Context context) {
+        super(context);
+    }
+
+    @Override
+    public void onBindViewHolder(PreferenceViewHolder view) {
+        super.onBindViewHolder(view);
+        mView = view;
+    }
+
+    /**
+     * Call this to try to give accessibility focus to the category title.
+     */
+    public void requestAccessibilityFocus() {
+        if (mView == null || mView.itemView == null) {
+            return;
+        }
+        if (!AccessibilityManager.getInstance(getContext()).isEnabled()) {
+            return;
+        }
+        mView.itemView.requestAccessibilityFocus();
+    }
+}

src/com/android/settings/fuelgauge/batteryusage/BatteryUsageBreakdownController.java

@@ -27,7 +27,6 @@ import android.view.View;
 import android.widget.AdapterView;
 
 import androidx.preference.Preference;
-import androidx.preference.PreferenceCategory;
 import androidx.preference.PreferenceGroup;
 import androidx.preference.PreferenceScreen;
 
@@ -75,7 +74,7 @@ public class BatteryUsageBreakdownController extends BasePreferenceController
     @VisibleForTesting
     Context mPrefContext;
     @VisibleForTesting
-    PreferenceCategory mRootPreference;
+    AccessibilityFocusablePreferenceCategory mRootPreference;
     @VisibleForTesting
     SpinnerPreference mSpinnerPreference;
     @VisibleForTesting
@@ -193,7 +192,6 @@ public class BatteryUsageBreakdownController extends BasePreferenceController
         showFooterPreference(isAllUsageDataEmpty, slotTimestamp);
     }
 
-    // TODO: request accessibility focus on category title when slot selection updated.
     private void showCategoryTitle(String slotTimestamp) {
         mRootPreference.setTitle(slotTimestamp == null
                 ? mPrefContext.getString(
@@ -201,6 +199,7 @@ public class BatteryUsageBreakdownController extends BasePreferenceController
                 : mPrefContext.getString(
                         R.string.battery_usage_breakdown_title_for_slot, slotTimestamp));
         mRootPreference.setVisible(true);
+        mRootPreference.requestAccessibilityFocus();
     }
 
     private void showFooterPreference(boolean isAllBatteryUsageEmpty, String slotTimestamp) {