1 /* 2 * Copyright (C) 2014 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; 18 19 import android.os.Handler; 20 import android.os.Looper; 21 22 import java.util.List; 23 import java.util.concurrent.AbstractExecutorService; 24 import java.util.concurrent.TimeUnit; 25 26 /** 27 * An executor service that executes its tasks on the main thread. 28 * 29 * Shutting down this executor is not supported. 30 */ 31 public class MainThreadExecutor extends AbstractExecutorService { 32 33 private Handler mHandler = new Handler(Looper.getMainLooper()); 34 35 @Override 36 public void execute(Runnable runnable) { 37 if (Looper.getMainLooper() == Looper.myLooper()) { 38 runnable.run(); 39 } else { 40 mHandler.post(runnable); 41 } 42 } 43 44 /** 45 * Not supported and throws an exception when used. 46 */ 47 @Override 48 @Deprecated 49 public void shutdown() { 50 throw new UnsupportedOperationException(); 51 } 52 53 /** 54 * Not supported and throws an exception when used. 55 */ 56 @Override 57 @Deprecated 58 public List<Runnable> shutdownNow() { 59 throw new UnsupportedOperationException(); 60 } 61 62 @Override 63 public boolean isShutdown() { 64 return false; 65 } 66 67 @Override 68 public boolean isTerminated() { 69 return false; 70 } 71 72 /** 73 * Not supported and throws an exception when used. 74 */ 75 @Override 76 @Deprecated 77 public boolean awaitTermination(long l, TimeUnit timeUnit) throws InterruptedException { 78 throw new UnsupportedOperationException(); 79 } 80 } 81
