1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.settings.notification; 18 19 import android.content.ContentResolver; 20 import android.content.Context; 21 import android.database.ContentObserver; 22 import android.net.Uri; 23 import android.os.Handler; 24 25 import androidx.annotation.VisibleForTesting; 26 import androidx.preference.Preference; 27 import androidx.preference.PreferenceScreen; 28 29 import com.android.settings.SettingsPreferenceFragment; 30 import com.android.settings.core.PreferenceControllerMixin; 31 import com.android.settingslib.core.AbstractPreferenceController; 32 import com.android.settingslib.core.lifecycle.Lifecycle; 33 import com.android.settingslib.core.lifecycle.LifecycleObserver; 34 import com.android.settingslib.core.lifecycle.events.OnPause; 35 import com.android.settingslib.core.lifecycle.events.OnResume; 36 37 public abstract class SettingPrefController extends AbstractPreferenceController 38 implements PreferenceControllerMixin, LifecycleObserver, OnResume, OnPause { 39 40 protected static final int DEFAULT_ON = 1; 41 42 private SettingsPreferenceFragment mParent; 43 protected SettingsObserver mSettingsObserver; 44 protected SettingPref mPreference; 45 SettingPrefController(Context context, SettingsPreferenceFragment parent, Lifecycle lifecycle)46 public SettingPrefController(Context context, SettingsPreferenceFragment parent, 47 Lifecycle lifecycle) { 48 super(context); 49 mParent = parent; 50 if (lifecycle != null) { 51 lifecycle.addObserver(this); 52 } 53 } 54 55 @Override displayPreference(PreferenceScreen screen)56 public void displayPreference(PreferenceScreen screen) { 57 mPreference.init(mParent); 58 super.displayPreference(screen); 59 if (isAvailable()) { 60 mSettingsObserver = new SettingsObserver(); 61 } 62 } 63 64 @Override getPreferenceKey()65 public String getPreferenceKey() { 66 return mPreference.getKey(); 67 } 68 69 @Override isAvailable()70 public boolean isAvailable() { 71 return mPreference.isApplicable(mContext); 72 } 73 74 @Override updateState(Preference preference)75 public void updateState(Preference preference) { 76 mPreference.update(mContext); 77 } 78 79 @Override onResume()80 public void onResume() { 81 if (mSettingsObserver != null) { 82 mSettingsObserver.register(true /* register */); 83 } 84 } 85 86 @Override onPause()87 public void onPause() { 88 if (mSettingsObserver != null) { 89 mSettingsObserver.register(false /* register */); 90 } 91 } 92 93 @VisibleForTesting 94 final class SettingsObserver extends ContentObserver { SettingsObserver()95 public SettingsObserver() { 96 super(new Handler()); 97 } 98 register(boolean register)99 public void register(boolean register) { 100 final ContentResolver cr = mContext.getContentResolver(); 101 if (register) { 102 cr.registerContentObserver(mPreference.getUri(), false, this); 103 } else { 104 cr.unregisterContentObserver(this); 105 } 106 } 107 108 @Override onChange(boolean selfChange, Uri uri)109 public void onChange(boolean selfChange, Uri uri) { 110 super.onChange(selfChange, uri); 111 if (mPreference.getUri().equals(uri)) { 112 mPreference.update(mContext); 113 } 114 } 115 } 116 117 } 118