1fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn/* 28a2ca60963f77938e1a611f2342ad043dc9467cfDianne Hackborn * Copyright (C) 2011 The Android Open Source Project 3fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 4fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Licensed under the Apache License, Version 2.0 (the "License"); 5fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * you may not use this file except in compliance with the License. 6fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * You may obtain a copy of the License at 7fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 8fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * http://www.apache.org/licenses/LICENSE-2.0 9fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 10fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Unless required by applicable law or agreed to in writing, software 11fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * distributed under the License is distributed on an "AS IS" BASIS, 12fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * See the License for the specific language governing permissions and 14fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * limitations under the License. 15fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 16fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 17fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornpackage android.support.v4.content; 18fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 19fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornimport java.util.concurrent.BlockingQueue; 20fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornimport java.util.concurrent.Callable; 21fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornimport java.util.concurrent.CancellationException; 22fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornimport java.util.concurrent.ExecutionException; 23fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornimport java.util.concurrent.Executor; 24fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornimport java.util.concurrent.FutureTask; 25fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornimport java.util.concurrent.LinkedBlockingQueue; 26fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornimport java.util.concurrent.ThreadFactory; 27fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornimport java.util.concurrent.ThreadPoolExecutor; 28fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornimport java.util.concurrent.TimeUnit; 29fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornimport java.util.concurrent.TimeoutException; 30fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornimport java.util.concurrent.atomic.AtomicBoolean; 31fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornimport java.util.concurrent.atomic.AtomicInteger; 32fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 33fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornimport android.os.Handler; 34fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornimport android.os.Message; 35fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackbornimport android.os.Process; 36fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 37fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn/** 380574ca37da4619afe4e26753f5a1b4de314b6565Svetoslav Ganov * Copy of the required parts of {@link android.os.AsyncTask} from Android 3.0 that is 390574ca37da4619afe4e26753f5a1b4de314b6565Svetoslav Ganov * needed to support AsyncTaskLoader. We use this rather than the one from the platform 40fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * because we rely on some subtle behavior of AsyncTask that is not reliable on 41fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * older platforms. 427dc96cc2410f551eefaa973ddc144146ad72d1ecDianne Hackborn * 437dc96cc2410f551eefaa973ddc144146ad72d1ecDianne Hackborn * <p>Note that for now this is not publicly available because it is not a 447dc96cc2410f551eefaa973ddc144146ad72d1ecDianne Hackborn * complete implementation, only sufficient for the needs of 457dc96cc2410f551eefaa973ddc144146ad72d1ecDianne Hackborn * {@link AsyncTaskLoader}. 46fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 477dc96cc2410f551eefaa973ddc144146ad72d1ecDianne Hackbornabstract class ModernAsyncTask<Params, Progress, Result> { 48fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private static final String LOG_TAG = "AsyncTask"; 49fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 50fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private static final int CORE_POOL_SIZE = 5; 51fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private static final int MAXIMUM_POOL_SIZE = 128; 52fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private static final int KEEP_ALIVE = 1; 53fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 54fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private static final ThreadFactory sThreadFactory = new ThreadFactory() { 55fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private final AtomicInteger mCount = new AtomicInteger(1); 56fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 57fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn public Thread newThread(Runnable r) { 58fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn return new Thread(r, "ModernAsyncTask #" + mCount.getAndIncrement()); 59fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 60fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn }; 61fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 62fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private static final BlockingQueue<Runnable> sPoolWorkQueue = 63fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn new LinkedBlockingQueue<Runnable>(10); 64fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 65fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 66fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * An {@link Executor} that can be used to execute tasks in parallel. 67fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 68fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn public static final Executor THREAD_POOL_EXECUTOR 69fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn = new ThreadPoolExecutor(CORE_POOL_SIZE, MAXIMUM_POOL_SIZE, KEEP_ALIVE, 70fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn TimeUnit.SECONDS, sPoolWorkQueue, sThreadFactory); 71fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 72fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private static final int MESSAGE_POST_RESULT = 0x1; 73fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private static final int MESSAGE_POST_PROGRESS = 0x2; 74fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 75fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private static final InternalHandler sHandler = new InternalHandler(); 76fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 77fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private static volatile Executor sDefaultExecutor = THREAD_POOL_EXECUTOR; 78fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private final WorkerRunnable<Params, Result> mWorker; 79fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private final FutureTask<Result> mFuture; 80fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 81fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private volatile Status mStatus = Status.PENDING; 82fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 83fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private final AtomicBoolean mTaskInvoked = new AtomicBoolean(); 84fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 85fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 86fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Indicates the current status of the task. Each status will be set only once 87fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * during the lifetime of a task. 88fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 89fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn public enum Status { 90fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 91fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Indicates that the task has not been executed yet. 92fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 93fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn PENDING, 94fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 95fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Indicates that the task is running. 96fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 97fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn RUNNING, 98fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 990574ca37da4619afe4e26753f5a1b4de314b6565Svetoslav Ganov * Indicates that {@link android.os.AsyncTask#onPostExecute(Object)} has finished. 100fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 101fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn FINISHED, 102fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 103fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 104fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** @hide Used to force static handler to be created. */ 105fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn public static void init() { 106fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn sHandler.getLooper(); 107fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 108fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 109fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** @hide */ 110fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn public static void setDefaultExecutor(Executor exec) { 111fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn sDefaultExecutor = exec; 112fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 113fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 114fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 115fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Creates a new asynchronous task. This constructor must be invoked on the UI thread. 116fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 117fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn public ModernAsyncTask() { 118fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn mWorker = new WorkerRunnable<Params, Result>() { 119fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn public Result call() throws Exception { 120fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn mTaskInvoked.set(true); 121fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 122fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND); 123fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn return postResult(doInBackground(mParams)); 124fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 125fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn }; 126fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 127fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn mFuture = new FutureTask<Result>(mWorker) { 128fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn @Override 129fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn protected void done() { 130fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn try { 131fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn final Result result = get(); 132fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 133fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn postResultIfNotInvoked(result); 134fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } catch (InterruptedException e) { 135fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn android.util.Log.w(LOG_TAG, e); 136fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } catch (ExecutionException e) { 137fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn throw new RuntimeException("An error occured while executing doInBackground()", 138fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn e.getCause()); 139fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } catch (CancellationException e) { 140fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn postResultIfNotInvoked(null); 141fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } catch (Throwable t) { 142fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn throw new RuntimeException("An error occured while executing " 143fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn + "doInBackground()", t); 144fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 145fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 146fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn }; 147fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 148fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 149fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private void postResultIfNotInvoked(Result result) { 150fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn final boolean wasTaskInvoked = mTaskInvoked.get(); 151fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn if (!wasTaskInvoked) { 152fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn postResult(result); 153fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 154fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 155fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 156fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private Result postResult(Result result) { 157fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn Message message = sHandler.obtainMessage(MESSAGE_POST_RESULT, 158fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn new AsyncTaskResult<Result>(this, result)); 159fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn message.sendToTarget(); 160fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn return result; 161fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 162fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 163fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 164fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Returns the current status of this task. 165fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 166fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @return The current status. 167fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 168fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn public final Status getStatus() { 169fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn return mStatus; 170fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 171fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 172fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 173fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Override this method to perform a computation on a background thread. The 174fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * specified parameters are the parameters passed to {@link #execute} 175fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * by the caller of this task. 176fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 177fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * This method can call {@link #publishProgress} to publish updates 178fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * on the UI thread. 179fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 180fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @param params The parameters of the task. 181fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 182fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @return A result, defined by the subclass of this task. 183fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 184fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #onPreExecute() 185fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #onPostExecute 186fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #publishProgress 187fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 188fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn protected abstract Result doInBackground(Params... params); 189fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 190fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 191fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Runs on the UI thread before {@link #doInBackground}. 192fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 193fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #onPostExecute 194fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #doInBackground 195fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 196fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn protected void onPreExecute() { 197fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 198fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 199fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 200fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * <p>Runs on the UI thread after {@link #doInBackground}. The 201fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * specified result is the value returned by {@link #doInBackground}.</p> 202fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 203fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * <p>This method won't be invoked if the task was cancelled.</p> 204fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 205fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @param result The result of the operation computed by {@link #doInBackground}. 206fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 207fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #onPreExecute 208fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #doInBackground 209fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #onCancelled(Object) 210fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 211fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn @SuppressWarnings({"UnusedDeclaration"}) 212fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn protected void onPostExecute(Result result) { 213fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 214fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 215fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 216fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Runs on the UI thread after {@link #publishProgress} is invoked. 217fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * The specified values are the values passed to {@link #publishProgress}. 218fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 219fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @param values The values indicating progress. 220fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 221fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #publishProgress 222fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #doInBackground 223fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 224fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn @SuppressWarnings({"UnusedDeclaration"}) 225fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn protected void onProgressUpdate(Progress... values) { 226fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 227fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 228fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 229fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * <p>Runs on the UI thread after {@link #cancel(boolean)} is invoked and 230fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * {@link #doInBackground(Object[])} has finished.</p> 231fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 232fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * <p>The default implementation simply invokes {@link #onCancelled()} and 233fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * ignores the result. If you write your own implementation, do not call 234fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * <code>super.onCancelled(result)</code>.</p> 235fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 236fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @param result The result, if any, computed in 237fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * {@link #doInBackground(Object[])}, can be null 238fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 239fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #cancel(boolean) 240fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #isCancelled() 241fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 242fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn @SuppressWarnings({"UnusedParameters"}) 243fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn protected void onCancelled(Result result) { 244fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn onCancelled(); 245fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 246fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 247fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 248fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * <p>Applications should preferably override {@link #onCancelled(Object)}. 249fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * This method is invoked by the default implementation of 250fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * {@link #onCancelled(Object)}.</p> 251fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 252fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * <p>Runs on the UI thread after {@link #cancel(boolean)} is invoked and 253fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * {@link #doInBackground(Object[])} has finished.</p> 254fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 255fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #onCancelled(Object) 256fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #cancel(boolean) 257fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #isCancelled() 258fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 259fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn protected void onCancelled() { 260fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 261fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 262fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 263fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Returns <tt>true</tt> if this task was cancelled before it completed 264fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * normally. If you are calling {@link #cancel(boolean)} on the task, 265fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * the value returned by this method should be checked periodically from 266fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * {@link #doInBackground(Object[])} to end the task as soon as possible. 267fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 268fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @return <tt>true</tt> if task was cancelled before it completed 269fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 270fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #cancel(boolean) 271fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 272fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn public final boolean isCancelled() { 273fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn return mFuture.isCancelled(); 274fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 275fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 276fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 277fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * <p>Attempts to cancel execution of this task. This attempt will 278fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * fail if the task has already completed, already been cancelled, 279fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * or could not be cancelled for some other reason. If successful, 280fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * and this task has not started when <tt>cancel</tt> is called, 281fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * this task should never run. If the task has already started, 282fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * then the <tt>mayInterruptIfRunning</tt> parameter determines 283fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * whether the thread executing this task should be interrupted in 284fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * an attempt to stop the task.</p> 285fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 286fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * <p>Calling this method will result in {@link #onCancelled(Object)} being 287fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * invoked on the UI thread after {@link #doInBackground(Object[])} 288fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * returns. Calling this method guarantees that {@link #onPostExecute(Object)} 289fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * is never invoked. After invoking this method, you should check the 290fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * value returned by {@link #isCancelled()} periodically from 291fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * {@link #doInBackground(Object[])} to finish the task as early as 292fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * possible.</p> 293fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 294fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @param mayInterruptIfRunning <tt>true</tt> if the thread executing this 295fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * task should be interrupted; otherwise, in-progress tasks are allowed 296fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * to complete. 297fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 298fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @return <tt>false</tt> if the task could not be cancelled, 299fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * typically because it has already completed normally; 300fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * <tt>true</tt> otherwise 301fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 302fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #isCancelled() 303fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #onCancelled(Object) 304fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 305fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn public final boolean cancel(boolean mayInterruptIfRunning) { 306fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn return mFuture.cancel(mayInterruptIfRunning); 307fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 308fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 309fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 310fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Waits if necessary for the computation to complete, and then 311fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * retrieves its result. 312fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 313fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @return The computed result. 314fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 315fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @throws CancellationException If the computation was cancelled. 316fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @throws ExecutionException If the computation threw an exception. 317fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @throws InterruptedException If the current thread was interrupted 318fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * while waiting. 319fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 320fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn public final Result get() throws InterruptedException, ExecutionException { 321fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn return mFuture.get(); 322fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 323fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 324fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 325fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Waits if necessary for at most the given time for the computation 326fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * to complete, and then retrieves its result. 327fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 328fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @param timeout Time to wait before cancelling the operation. 329fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @param unit The time unit for the timeout. 330fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 331fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @return The computed result. 332fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 333fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @throws CancellationException If the computation was cancelled. 334fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @throws ExecutionException If the computation threw an exception. 335fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @throws InterruptedException If the current thread was interrupted 336fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * while waiting. 337fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @throws TimeoutException If the wait timed out. 338fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 339fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn public final Result get(long timeout, TimeUnit unit) throws InterruptedException, 340fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn ExecutionException, TimeoutException { 341fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn return mFuture.get(timeout, unit); 342fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 343fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 344fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 345fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Executes the task with the specified parameters. The task returns 346fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * itself (this) so that the caller can keep a reference to it. 347fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 348fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * <p>Note: this function schedules the task on a queue for a single background 349fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * thread or pool of threads depending on the platform version. When first 350fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * introduced, AsyncTasks were executed serially on a single background thread. 351fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Starting with {@link android.os.Build.VERSION_CODES#DONUT}, this was changed 352fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * to a pool of threads allowing multiple tasks to operate in parallel. After 353fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * {@link android.os.Build.VERSION_CODES#HONEYCOMB}, it is planned to change this 354fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * back to a single thread to avoid common application errors caused 355fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * by parallel execution. If you truly want parallel execution, you can use 356fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * the {@link #executeOnExecutor} version of this method 357fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * with {@link #THREAD_POOL_EXECUTOR}; however, see commentary there for warnings on 358fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * its use. 359fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 360fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * <p>This method must be invoked on the UI thread. 361fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 362fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @param params The parameters of the task. 363fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 364fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @return This instance of AsyncTask. 365fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 366fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @throws IllegalStateException If {@link #getStatus()} returns either 3670574ca37da4619afe4e26753f5a1b4de314b6565Svetoslav Ganov * {@link android.os.AsyncTask.Status#RUNNING} or 3680574ca37da4619afe4e26753f5a1b4de314b6565Svetoslav Ganov * {@link android.os.AsyncTask.Status#FINISHED}. 369fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 370fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn public final ModernAsyncTask<Params, Progress, Result> execute(Params... params) { 371fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn return executeOnExecutor(sDefaultExecutor, params); 372fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 373fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 374fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 375fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Executes the task with the specified parameters. The task returns 376fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * itself (this) so that the caller can keep a reference to it. 377fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 378fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * <p>This method is typically used with {@link #THREAD_POOL_EXECUTOR} to 379fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * allow multiple tasks to run in parallel on a pool of threads managed by 380fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * AsyncTask, however you can also use your own {@link Executor} for custom 381fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * behavior. 382fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 383fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * <p><em>Warning:</em> Allowing multiple tasks to run in parallel from 384fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * a thread pool is generally <em>not</em> what one wants, because the order 385fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * of their operation is not defined. For example, if these tasks are used 386fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * to modify any state in common (such as writing a file due to a button click), 387fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * there are no guarantees on the order of the modifications. 388fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Without careful work it is possible in rare cases for the newer version 389fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * of the data to be over-written by an older one, leading to obscure data 3900574ca37da4619afe4e26753f5a1b4de314b6565Svetoslav Ganov * loss and stability issues. 391fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 392fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * <p>This method must be invoked on the UI thread. 393fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 394fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @param exec The executor to use. {@link #THREAD_POOL_EXECUTOR} is available as a 395fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * convenient process-wide thread pool for tasks that are loosely coupled. 396fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @param params The parameters of the task. 397fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 398fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @return This instance of AsyncTask. 399fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 400fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @throws IllegalStateException If {@link #getStatus()} returns either 4010574ca37da4619afe4e26753f5a1b4de314b6565Svetoslav Ganov * {@link android.os.AsyncTask.Status#RUNNING} 4020574ca37da4619afe4e26753f5a1b4de314b6565Svetoslav Ganov * or {@link android.os.AsyncTask.Status#FINISHED}. 403fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 404fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn public final ModernAsyncTask<Params, Progress, Result> executeOnExecutor(Executor exec, 405fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn Params... params) { 406fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn if (mStatus != Status.PENDING) { 407fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn switch (mStatus) { 408fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn case RUNNING: 409fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn throw new IllegalStateException("Cannot execute task:" 410fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn + " the task is already running."); 411fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn case FINISHED: 412fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn throw new IllegalStateException("Cannot execute task:" 413fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn + " the task has already been executed " 414fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn + "(a task can be executed only once)"); 415fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 416fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 417fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 418fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn mStatus = Status.RUNNING; 419fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 420fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn onPreExecute(); 421fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 422fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn mWorker.mParams = params; 423fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn exec.execute(mFuture); 424fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 425fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn return this; 426fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 427fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 428fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 429fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * Convenience version of {@link #execute(Object...)} for use with 430fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * a simple Runnable object. 431fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 432fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn public static void execute(Runnable runnable) { 433fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn sDefaultExecutor.execute(runnable); 434fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 435fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 436fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn /** 437fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * This method can be invoked from {@link #doInBackground} to 438fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * publish updates on the UI thread while the background computation is 439fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * still running. Each call to this method will trigger the execution of 440fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * {@link #onProgressUpdate} on the UI thread. 441fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 442fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * {@link #onProgressUpdate} will note be called if the task has been 443fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * canceled. 444fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 445fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @param values The progress values to update the UI with. 446fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * 447fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #onProgressUpdate 448fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn * @see #doInBackground 449fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn */ 450fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn protected final void publishProgress(Progress... values) { 451fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn if (!isCancelled()) { 452fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn sHandler.obtainMessage(MESSAGE_POST_PROGRESS, 453fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn new AsyncTaskResult<Progress>(this, values)).sendToTarget(); 454fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 455fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 456fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 457fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private void finish(Result result) { 458fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn if (isCancelled()) { 459fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn onCancelled(result); 460fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } else { 461fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn onPostExecute(result); 462fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 463fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn mStatus = Status.FINISHED; 464fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 465fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 466fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private static class InternalHandler extends Handler { 467fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn @SuppressWarnings({"unchecked", "RawUseOfParameterizedType"}) 468fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn @Override 469fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn public void handleMessage(Message msg) { 470fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn AsyncTaskResult result = (AsyncTaskResult) msg.obj; 471fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn switch (msg.what) { 472fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn case MESSAGE_POST_RESULT: 473fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn // There is only one result 474fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn result.mTask.finish(result.mData[0]); 475fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn break; 476fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn case MESSAGE_POST_PROGRESS: 477fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn result.mTask.onProgressUpdate(result.mData); 478fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn break; 479fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 480fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 481fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 482fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 483fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private static abstract class WorkerRunnable<Params, Result> implements Callable<Result> { 484fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn Params[] mParams; 485fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 486fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 487fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn @SuppressWarnings({"RawUseOfParameterizedType"}) 488fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn private static class AsyncTaskResult<Data> { 489fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn final ModernAsyncTask mTask; 490fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn final Data[] mData; 491fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn 492fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn AsyncTaskResult(ModernAsyncTask task, Data... data) { 493fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn mTask = task; 494fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn mData = data; 495fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 496fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn } 497fbabff99ccbcb576c713991c5db5dec21a0d0ce0Dianne Hackborn} 498