Add switch preference for Audio Description.

Preview: https://screenshot.googleplex.com/AXMFpGPPGPPBzXG

Bug: 214634651i
Test: Local flash and test
Test: atest SettingsRoboTests:AudioDescriptionPreferenceControllerTest

Change-Id: Ice2e2bc8ec4e77aba0cd486f854254009b91e541

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

@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2022 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 android.provider.Settings.Secure.ENABLED_ACCESSIBILITY_AUDIO_DESCRIPTION_BY_DEFAULT;
+
+import static com.android.settings.accessibility.AccessibilityUtil.State.OFF;
+import static com.android.settings.accessibility.AccessibilityUtil.State.ON;
+
+import android.content.Context;
+import android.os.UserHandle;
+import android.provider.Settings;
+
+import com.android.settings.R;
+import com.android.settings.core.TogglePreferenceController;
+
+/**
+ * A toggle preference controller for audio description
+ */
+public class AudioDescriptionPreferenceController extends TogglePreferenceController {
+
+    static final String PREF_KEY = "toggle_audio_description";
+
+    public AudioDescriptionPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public boolean isChecked() {
+        return Settings.Secure.getIntForUser(mContext.getContentResolver(),
+                ENABLED_ACCESSIBILITY_AUDIO_DESCRIPTION_BY_DEFAULT,
+                OFF /* default */,
+                UserHandle.USER_CURRENT) == ON;
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        return Settings.Secure.putIntForUser(mContext.getContentResolver(),
+                ENABLED_ACCESSIBILITY_AUDIO_DESCRIPTION_BY_DEFAULT,
+                isChecked ? ON : OFF,
+                UserHandle.USER_CURRENT);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public int getSliceHighlightMenuRes() {
+        return R.string.menu_key_accessibility;
+    }
+}