安卓 :如何使用下载管理器暂停和恢复

Question

这是我的代码，我想添加可恢复功能，但我不能吗？

downloadManager = (DownloadManager)getSystemService(DOWNLOAD_SERVICE);
Uri Download_Uri = Uri.parse("http://download.thinkbroadband.com/20MB.zip");
DownloadManager.Request request = new DownloadManager.Request(Download_Uri);
//Restrict the types of networks over which this download may proceed.
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);
//Set whether this download may proceed over a roaming connection.
request.setAllowedOverRoaming(false);
//Set the title of this download, to be displayed in notifications (if enabled).
request.setTitle("My Data Download");
//Set a description of this download, to be displayed in notifications (if enabled)
request.setDescription("Android Data download using DownloadManager.");
//Set the local destination for the downloaded file to a path within the application's external files directory
request.setDestinationInExternalFilesDir(this, Environment.DIRECTORY_DOWNLOADS,"20MB.zip");
//Enqueue a new download and same the referenceId
downloadReference = downloadManager.enqueue(request);

Answer 1

我能够通过Android DownloadManager and Downloads Content Provider使用以下实现实现暂停/恢复功能：

private boolean resumeDownload(Context context, String downloadTitle) {
    int updatedRows = 0;        
    ContentValues resumeDownload = new ContentValues();
    resumeDownload.put("control", 0); // Resume Control Value
    try {
        updatedRows = context
            .getContentResolver()
            .update(Uri.parse("content://downloads/my_downloads"),
                resumeDownload,
                "title=?",
                new String[]{ downloadTitle });
    } catch (Exception e) {
        Log.e(TAG, "Failed to update control for downloading video");
    }
    return 0 < updatedRows;
}
private boolean pauseDownload(Context context, String downloadTitle) {
    int updatedRows = 0;
    ContentValues pauseDownload = new ContentValues();
    pauseDownload.put("control", 1); // Pause Control Value
    try {
        updatedRows = context
            .getContentResolver()
            .update(Uri.parse("content://downloads/my_downloads"),
                pauseDownload,
                "title=?",
                new String[]{ downloadTitle });
    } catch (Exception e) {
        Log.e(TAG, "Failed to update control for downloading video");
    }
    return 0 < updatedRows;
}