并行下载并通过 AsyncTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR) 获取单独的下载进度

Question

我正在使用

并行下载文件

asyncTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR)

我想要我添加的每个任务的单独进度。

ArrayList<AsyncTask> mListAsync = new ArrayList<>();
final DownloadTask downloadTask = new DownloadTask(mContext, name);
downloadTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR,mVideoUrl.trim());
mListAsync.add(downloadTask );

以上是我用来下载文件的示例代码，我确实维护了一个数组列表来获取队列中添加了多少任务。

有什么方法可以让我在线程池中添加单独的 AsyncTask 进度更新。

Answer 1

假设您的 DownloadTask class 使用 https://developer.android.com/reference/android/os/AsyncTask.html#publishProgress(Progress...) method, you can get the current progress in a callback from https://developer.android.com/reference/android/os/AsyncTask.html#onProgressUpdate(Progress...)

编辑：一些带有回调的示例代码：

public class SampleTask extends AsyncTask<Void, Integer, String> {

    private final int id;
    private final ProgressCallback callback;

    public SampleTask(int uniqueId, ProgressCallback callback){
        this.id = uniqueId;
        this.callback = callback;
    }

    @Override
    protected String doInBackground(Void... voids) {
        // do work and call publish progress in here
        for(int i = 0; i <= 100; i++) {
            try {
                Thread.sleep(500);
            } catch (InterruptedException e){
                e.printStackTrace();
            }
            publishProgress(i);
        }
        return null;
    }

    @Override
    protected void onProgressUpdate(Integer... values) {
        //handle progress updates from in here
        callback.onProgress(id, values[0]);
    }
}

public interface ProgressCallback{
    void onProgress(int uniqueId, int progress);
}

并行下载并通过 AsyncTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR) 获取单独的下载进度

Parallel downloading and get individual download progress via AsyncTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR)

android

android-asynctask

threadpoolexecutor