Add settings for notification bubbling

Globally, as well as at the app and channel level

Test: atest
Bug: 123543052
Change-Id: I1668b592c5d175d77d6a38f35e7576d641175d44

src/com/android/settings/notification/BubbleNotificationPreferenceController.java

@@ -0,0 +1,124 @@
+/*
+ * 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.notification;
+
+import static android.provider.Settings.Secure.NOTIFICATION_BUBBLES;
+import static android.provider.Settings.Secure.NOTIFICATION_BUBBLES;
+
+import android.content.ContentResolver;
+import android.content.Context;
+import android.database.ContentObserver;
+import android.net.Uri;
+import android.os.Handler;
+import android.provider.Settings;
+import android.text.TextUtils;
+
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settings.core.TogglePreferenceController;
+import com.android.settingslib.core.lifecycle.LifecycleObserver;
+import com.android.settingslib.core.lifecycle.events.OnPause;
+import com.android.settingslib.core.lifecycle.events.OnResume;
+
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+public class BubbleNotificationPreferenceController extends TogglePreferenceController
+        implements PreferenceControllerMixin, Preference.OnPreferenceChangeListener,
+        LifecycleObserver, OnResume, OnPause {
+
+    private static final String TAG = "BubbleNotifPrefContr";
+    @VisibleForTesting
+    static final int ON = 1;
+    @VisibleForTesting
+    static final int OFF = 0;
+
+    private SettingObserver mSettingObserver;
+
+    public BubbleNotificationPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        Preference preference = screen.findPreference(NOTIFICATION_BUBBLES);
+        if (preference != null) {
+            mSettingObserver = new SettingObserver(preference);
+        }
+    }
+
+    @Override
+    public void onResume() {
+        if (mSettingObserver != null) {
+            mSettingObserver.register(mContext.getContentResolver(), true /* register */);
+        }
+    }
+
+    @Override
+    public void onPause() {
+        if (mSettingObserver != null) {
+            mSettingObserver.register(mContext.getContentResolver(), false /* register */);
+        }
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public boolean isChecked() {
+        return Settings.Secure.getInt(mContext.getContentResolver(),
+                NOTIFICATION_BUBBLES, ON) == ON;
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        return Settings.Secure.putInt(mContext.getContentResolver(),
+                NOTIFICATION_BUBBLES, isChecked ? ON : OFF);
+    }
+
+    class SettingObserver extends ContentObserver {
+
+        private final Uri NOTIFICATION_BUBBLES_URI =
+                Settings.Secure.getUriFor(NOTIFICATION_BUBBLES);
+
+        private final Preference mPreference;
+
+        public SettingObserver(Preference preference) {
+            super(new Handler());
+            mPreference = preference;
+        }
+
+        public void register(ContentResolver cr, boolean register) {
+            if (register) {
+                cr.registerContentObserver(NOTIFICATION_BUBBLES_URI, false, this);
+            } else {
+                cr.unregisterContentObserver(this);
+            }
+        }
+
+        @Override
+        public void onChange(boolean selfChange, Uri uri) {
+            super.onChange(selfChange, uri);
+            if (NOTIFICATION_BUBBLES_URI.equals(uri)) {
+                updateState(mPreference);
+            }
+        }
+    }
+}