Android：如何使用 DownloadManager 暂停和恢复？

Question

这是我的代码，我想添加可恢复的功能，但我不能这样做吗？

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 和 Downloads Content Provider 使用以下实现来实现暂停/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;
}