android - DownloadManager 为下载失败发送 STATUS_SUCCESSFUL

Question

好的，我正在下载文件(图片)。下载完成后，我想发送一条消息，其中包含图像的本地 URI。但是 20% 的时间我得到这个:

6-01 18:46:39.900: INFO/DownloadManager(412): Initiating request for download 605
06-01 18:46:39.910: WARN/DownloadManager(412): Aborting request for download 605: Trying to resume a download that can't be resumed
06-01 18:46:39.910: INFO/ololo(2826): Okay, I'll broadcast.
06-01 18:46:39.990: WARN/ImageView(2826): Unable to open content: content://downloads/my_downloads/605
    java.io.FileNotFoundException: No filename found.
    at android.database.DatabaseUtils.readExceptionWithFileNotFoundExceptionFromParcel(DatabaseUtils.java:145)...
06-01 18:46:39.990: INFO/System.out(2826): resolveUri failed on bad bitmap uri: content://downloads/my_downloads/605
06-01 18:46:39.990: INFO/ololo(2826): content://downloads/my_downloads/605 was set for android.widget.ImageView@408a2cf0

这是代码

Long downloadId = downloadIds.get(this);

if(downloadId == intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1)) {
    DownloadManager.Query query = new DownloadManager.Query();
    query.setFilterById(downloadId);
    Cursor cursor = downloadManager.query(query);

    if(cursor.moveToFirst()) {

        switch (cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS))) {
            case DownloadManager.STATUS_SUCCESSFUL : {
                Log.i("ololo", "Okay, I'll broadcast.");
                // Broadcasting
                break;
            }
            case DownloadManager.STATUS_FAILED : {
                Log.i("ololo", "Bad, I won't broadcast.");
                int reason = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_REASON));
                if(reason == DownloadManager.ERROR_CANNOT_RESUME || reason == DownloadManager.ERROR_UNKNOWN) {
                    // Rerun download
                }
                break;
            }
            default:
                break;
        }
    }
}

Answer 1

DownloadManager 存在问题，无法正常工作。这个错误是在一段时间前提交给谷歌的:

https://code.google.com/p/android/issues/detail?id=18462

对于单个文件下载，您可以通过指定一个专门为此目的下载的唯一目录来解决此问题，并在 DownloadManager.STATUS_SUCCESSFUL 时获取您在该目录中获得的任何内容。
对于多文件下载，目前我想不出解决方法，除非您能够在源代码处重命名文件。