AsyncTaskCompat.java revision b14fc7c928307b6758688ed38590bf674c62a01b 
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
17package android.support.v4.os;
18
19import android.os.AsyncTask;
20import android.os.Build;
21
22/**
23 * Helper for accessing features in {@link android.os.AsyncTask}
24 * introduced after API level 4 in a backwards compatible fashion.
25 */
26public class AsyncTaskCompat {
27
28    /**
29     * Executes the task with the specified parameters, allowing multiple tasks to run in parallel
30     * on a pool of threads managed by {@link android.os.AsyncTask}.
31     *
32     * @param task The {@link android.os.AsyncTask} to execute.
33     * @param params The parameters of the task.
34     * @return the instance of AsyncTask.
35     */
36    public static <Params, Progress, Result> AsyncTask<Params, Progress, Result> executeParallel(
37            AsyncTask<Params, Progress, Result> task,
38            Params... params) {
39        if (task == null) {
40            throw new IllegalArgumentException("task can not be null");
41        }
42
43        if (Build.VERSION.SDK_INT >= 11) {
44            // From API 11 onwards, we need to manually select the THREAD_POOL_EXECUTOR
45            AsyncTaskCompatHoneycomb.executeParallel(task, params);
46        } else {
47            // Before API 11, all tasks were run in parallel
48            task.execute(params);
49        }
50
51        return task;
52    }
53
54}
55