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 android.annotation; 18 19 import static java.lang.annotation.ElementType.PARAMETER; 20 import static java.lang.annotation.RetentionPolicy.SOURCE; 21 22 import java.lang.annotation.Retention; 23 import java.lang.annotation.Target; 24 import java.util.concurrent.Executor; 25 26 /** 27 * @paramDoc Callback and listener events are dispatched through this 28 * {@link Executor}, providing an easy way to control which thread is 29 * used. To dispatch events through the main thread of your 30 * application, you can use 31 * {@link android.content.Context#getMainExecutor() Context.getMainExecutor()}. 32 * To dispatch events through a shared thread pool, you can use 33 * {@link android.os.AsyncTask#THREAD_POOL_EXECUTOR AsyncTask#THREAD_POOL_EXECUTOR}. 34 * @hide 35 */ 36 @Retention(SOURCE) 37 @Target(PARAMETER) 38 public @interface CallbackExecutor { 39 } 40