The Tor Browser / file comparison
comparison: mobile/android/base/util/UiAsyncTask.java
mobile/android/base/util/UiAsyncTask.java
- changeset 0
- 6474c204b198
equal
deleted
inserted
replaced
| -1:000000000000 | 0:2eee4ced8457 |
|---|---|
| 1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*- | |
| 2 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 package org.mozilla.gecko.util; | |
| 7 | |
| 8 import android.os.Handler; | |
| 9 import android.os.Looper; | |
| 10 | |
| 11 /** | |
| 12 * Executes a background task and publishes the result on the UI thread. | |
| 13 * | |
| 14 * The standard {@link android.os.AsyncTask} only runs onPostExecute on the | |
| 15 * thread it is constructed on, so this is a convenience class for creating | |
| 16 * tasks off the UI thread. | |
| 17 */ | |
| 18 public abstract class UiAsyncTask<Params, Progress, Result> { | |
| 19 private volatile boolean mCancelled = false; | |
| 20 private final Handler mBackgroundThreadHandler; | |
| 21 private static Handler sHandler; | |
| 22 | |
| 23 /** | |
| 24 * Creates a new asynchronous task. | |
| 25 * | |
| 26 * @param backgroundThreadHandler the handler to execute the background task on | |
| 27 */ | |
| 28 public UiAsyncTask(Handler backgroundThreadHandler) { | |
| 29 mBackgroundThreadHandler = backgroundThreadHandler; | |
| 30 } | |
| 31 | |
| 32 private static synchronized Handler getUiHandler() { | |
| 33 if (sHandler == null) { | |
| 34 sHandler = new Handler(Looper.getMainLooper()); | |
| 35 } | |
| 36 return sHandler; | |
| 37 } | |
| 38 | |
| 39 private final class BackgroundTaskRunnable implements Runnable { | |
| 40 private Params[] mParams; | |
| 41 | |
| 42 public BackgroundTaskRunnable(Params... params) { | |
| 43 mParams = params; | |
| 44 } | |
| 45 | |
| 46 @Override | |
| 47 public void run() { | |
| 48 final Result result = doInBackground(mParams); | |
| 49 | |
| 50 getUiHandler().post(new Runnable() { | |
| 51 @Override | |
| 52 public void run() { | |
| 53 if (mCancelled) | |
| 54 onCancelled(); | |
| 55 else | |
| 56 onPostExecute(result); | |
| 57 } | |
| 58 }); | |
| 59 } | |
| 60 } | |
| 61 | |
| 62 public final void execute(final Params... params) { | |
| 63 getUiHandler().post(new Runnable() { | |
| 64 @Override | |
| 65 public void run() { | |
| 66 onPreExecute(); | |
| 67 mBackgroundThreadHandler.post(new BackgroundTaskRunnable(params)); | |
| 68 } | |
| 69 }); | |
| 70 } | |
| 71 | |
| 72 @SuppressWarnings({"UnusedParameters"}) | |
| 73 public final boolean cancel(boolean mayInterruptIfRunning) { | |
| 74 mCancelled = true; | |
| 75 return mCancelled; | |
| 76 } | |
| 77 | |
| 78 public final boolean isCancelled() { | |
| 79 return mCancelled; | |
| 80 } | |
| 81 | |
| 82 protected void onPreExecute() { } | |
| 83 protected void onPostExecute(Result result) { } | |
| 84 protected void onCancelled() { } | |
| 85 protected abstract Result doInBackground(Params... params); | |
| 86 } |
