1 /* 2 * Copyright (C) 2022 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.car.audio; 18 19 import android.database.ContentObserver; 20 import android.net.Uri; 21 import android.os.Handler; 22 23 import java.util.Objects; 24 25 final class ContentObserverFactory { 26 27 private final Uri mUri; 28 ContentObserverFactory(Uri uri)29 ContentObserverFactory(Uri uri) { 30 mUri = Objects.requireNonNull(uri, "Uri cannot be null"); 31 } 32 createObserver(ContentChangeCallback wrapper, Handler handler)33 ContentObserver createObserver(ContentChangeCallback wrapper, Handler handler) { 34 Objects.requireNonNull(wrapper, "Content Change Callback cannot be null"); 35 Objects.requireNonNull(handler, "Handler cannot be null"); 36 37 return new ContentObserver(handler) { 38 @Override 39 public void onChange(boolean selfChange, Uri uri) { 40 if (mUri.equals(uri)) { 41 wrapper.onChange(); 42 } 43 } 44 }; 45 } 46 47 interface ContentChangeCallback { 48 void onChange(); 49 } 50 } 51