add a global control for badging

Bug: 36021111
Test: make RunSettingsRoboTests
Change-Id: I7ffd2ade4c927d261e302ddadfae486040d62824

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

@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2017 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 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.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.support.v7.preference.TwoStatePreference;
+import android.util.Log;
+
+import com.android.settings.core.PreferenceController;
+import com.android.settings.core.lifecycle.LifecycleObserver;
+import com.android.settings.core.lifecycle.events.OnPause;
+import com.android.settings.core.lifecycle.events.OnResume;
+
+import static android.provider.Settings.Secure.NOTIFICATION_BADGING;
+
+public class BadgingNotificationPreferenceController extends PreferenceController implements
+        Preference.OnPreferenceChangeListener, LifecycleObserver, OnResume, OnPause {
+
+    private static final String TAG = "BadgeNotifPrefContr";
+    private static final String KEY_NOTIFICATION_BADGING = "notification_badging";
+    private static final int DEFAULT_VALUE = 1;
+
+    private SettingObserver mSettingObserver;
+
+    public BadgingNotificationPreferenceController(Context context) {
+        super(context);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        Preference preference = screen.findPreference(NOTIFICATION_BADGING);
+        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 String getPreferenceKey() {
+        return KEY_NOTIFICATION_BADGING;
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return mContext.getResources()
+                .getBoolean(com.android.internal.R.bool.config_notificationBadging);
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        final boolean checked = Settings.Secure.getInt(mContext.getContentResolver(),
+                NOTIFICATION_BADGING, DEFAULT_VALUE) == 1;
+        ((TwoStatePreference) preference).setChecked(checked);
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        final boolean val = (Boolean) newValue;
+        return Settings.Secure.putInt(mContext.getContentResolver(),
+                NOTIFICATION_BADGING, val ? 1 : 0);
+    }
+
+    class SettingObserver extends ContentObserver {
+
+        private final Uri NOTIFICATION_BADGING_URI =
+                Settings.Secure.getUriFor(NOTIFICATION_BADGING);
+
+        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_BADGING_URI, false, this);
+            } else {
+                cr.unregisterContentObserver(this);
+            }
+        }
+
+        @Override
+        public void onChange(boolean selfChange, Uri uri) {
+            super.onChange(selfChange, uri);
+            if (NOTIFICATION_BADGING_URI.equals(uri)) {
+                updateState(mPreference);
+            }
+        }
+    }
+}