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.launcher3.util; 18 19 import android.content.ContentResolver; 20 import android.database.ContentObserver; 21 import android.os.Handler; 22 import android.provider.Settings; 23 24 public interface SettingsObserver { 25 26 /** 27 * Registers the content observer to call {@link #onSettingChanged(boolean)} when any of the 28 * passed settings change. The value passed to onSettingChanged() is based on the key setting. 29 */ register(String keySetting, String ... dependentSettings)30 void register(String keySetting, String ... dependentSettings); unregister()31 void unregister(); onSettingChanged(boolean keySettingEnabled)32 void onSettingChanged(boolean keySettingEnabled); 33 34 35 abstract class Secure extends ContentObserver implements SettingsObserver { 36 private ContentResolver mResolver; 37 private String mKeySetting; 38 Secure(ContentResolver resolver)39 public Secure(ContentResolver resolver) { 40 super(new Handler()); 41 mResolver = resolver; 42 } 43 44 @Override register(String keySetting, String ... dependentSettings)45 public void register(String keySetting, String ... dependentSettings) { 46 mKeySetting = keySetting; 47 mResolver.registerContentObserver( 48 Settings.Secure.getUriFor(mKeySetting), false, this); 49 for (String setting : dependentSettings) { 50 mResolver.registerContentObserver( 51 Settings.Secure.getUriFor(setting), false, this); 52 } 53 onChange(true); 54 } 55 56 @Override unregister()57 public void unregister() { 58 mResolver.unregisterContentObserver(this); 59 } 60 61 @Override onChange(boolean selfChange)62 public void onChange(boolean selfChange) { 63 super.onChange(selfChange); 64 onSettingChanged(Settings.Secure.getInt(mResolver, mKeySetting, 1) == 1); 65 } 66 } 67 68 abstract class System extends ContentObserver implements SettingsObserver { 69 private ContentResolver mResolver; 70 private String mKeySetting; 71 System(ContentResolver resolver)72 public System(ContentResolver resolver) { 73 super(new Handler()); 74 mResolver = resolver; 75 } 76 77 @Override register(String keySetting, String ... dependentSettings)78 public void register(String keySetting, String ... dependentSettings) { 79 mKeySetting = keySetting; 80 mResolver.registerContentObserver( 81 Settings.System.getUriFor(mKeySetting), false, this); 82 for (String setting : dependentSettings) { 83 mResolver.registerContentObserver( 84 Settings.System.getUriFor(setting), false, this); 85 } 86 onChange(true); 87 } 88 89 @Override unregister()90 public void unregister() { 91 mResolver.unregisterContentObserver(this); 92 } 93 94 @Override onChange(boolean selfChange)95 public void onChange(boolean selfChange) { 96 super.onChange(selfChange); 97 onSettingChanged(Settings.System.getInt(mResolver, mKeySetting, 1) == 1); 98 } 99 } 100 } 101