import com.liulishuo.filedownloader.FileDownloadQueueSet; //导入依赖的package包/类
/**
 * Start multiple download tasks parallel
 * <p>
 * 启动并行多任务下载
 *
 * @param view
 */
public void onClickMultiParallel(final View view) {
    updateDisplay(getString(R.string.hybrid_test_start_multiple_tasks_parallel, Constant.URLS.length));

    // 以相同的listener作为target，将不同的下载任务绑定起来
    final FileDownloadListener parallelTarget = createListener();
    final List<BaseDownloadTask> taskList = new ArrayList<>();
    int i = 0;
    for (String url : Constant.URLS) {
        taskList.add(FileDownloader.getImpl().create(url)
                .setTag(++i));
    }
    totalCounts += taskList.size();

    new FileDownloadQueueSet(parallelTarget)
            .setCallbackProgressTimes(1)
            .downloadTogether(taskList)
            .start();
}
 

import com.liulishuo.filedownloader.FileDownloadQueueSet; //导入依赖的package包/类
/**
 * Start multiple download tasks serial
 * <p>
 * 启动串行多任务下载
 *
 * @param view
 */
public void onClickMultiSerial(final View view) {
    updateDisplay(getString(R.string.hybrid_test_start_multiple_tasks_serial, Constant.URLS.length));

    // 以相同的listener作为target，将不同的下载任务绑定起来
    final List<BaseDownloadTask> taskList = new ArrayList<>();
    final FileDownloadListener serialTarget = createListener();
    int i = 0;
    for (String url : Constant.URLS) {
        taskList.add(FileDownloader.getImpl().create(url)
                .setTag(++i));
    }
    totalCounts += taskList.size();

    new FileDownloadQueueSet(serialTarget)
            .setCallbackProgressTimes(1)
            .downloadSequentially(taskList)
            .start();
}
 

import com.liulishuo.filedownloader.FileDownloadQueueSet; //导入依赖的package包/类
/**
     * 批量任务下载
     */
    public static void downloads(FDownListener listener, List<FTask> tasks) {
        final FileDownloadQueueSet queueSet = new FileDownloadQueueSet(listener);

        final List<BaseDownloadTask> baseDownloadTasks = new ArrayList<>();
        for (FTask task : tasks) {
            baseDownloadTasks.add(FileDownloader
                    .getImpl()
                    .create(task.url)
                    .setPath(task.path)
                    .setTag(task.url));
        }

        /**不回调进度*/
        queueSet.disableCallbackProgressTimes(); // do not want each task's download progress's callback,
        // we just consider which task will completed.

        // auto retry 1 time if download fail
        /**自动重试*/
        queueSet.setAutoRetryTimes(1);

        // start download in serial order
        /**串行下载*/
        //queueSet.downloadSequentially(baseDownloadTasks);
        // if your baseDownloadTasks are not a list, invoke such following will more readable:
//            queueSet.downloadSequentially(
//                    FileDownloader.getImpl().create(url).setPath(...),
//                    FileDownloader.getImpl().create(url).addHeader(...,...),
//                    FileDownloader.getImpl().create(url).setPath(...)
//            );
        // start parallel download
        /**并行下载*/
        queueSet.downloadTogether(baseDownloadTasks);
        // if your baseDownloadTasks are not a list, invoke such following will more readable:
//            queueSet.downloadTogether(
//                    FileDownloader.getImpl().create(url).setPath(...),
//                    FileDownloader.getImpl().create(url).setPath(...),
//                    FileDownloader.getImpl().create(url).setSyncCallback(true)
//            );
        queueSet.start();
    }