Question

我在我的项目中使用DonwloadManager，在官方参考中有关于ERROR_FILE_ALREADY_EXISTS的描述。

问题是我在使用相同的URL和目标URI时从未出现过这个错误。 DownloadManager始终下载相同的文件，只需在文件名末尾添加一些数字，以便与之前的下载不同。

入队代码非常简单且工作得很好，除了这个奇怪的东西允许你重新下载已经下载的文件：

Uri uri = Uri.parse(url);
Request request = new Request(uri);
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE |
DownloadManager.Request.NETWORK_WIFI);
request.setVisibleInDownloadsUi(false);
Uri fileDestinationUri = Uri.parse("file://" + new File(destinationFilePath);
request.setDestinationUri(fileDestinationUri);
long downloadId = downloadManager.enqueue(request);

我有BroadcastReciever正在听android.intent.action.DOWNLOAD_COMPLETE意图：

@Override
public void onReceive(Context context, Intent intent) {
    DownloadManager dm = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);

    long downloadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);

    Query query = new Query();
    query.setFilterById(downloadId);
    Cursor cur = dm.query(query);

    if (cur.moveToFirst()) {
        int columnIndex = cur.getColumnIndex(DownloadManager.COLUMN_STATUS);

        switch (cur.getInt(columnIndex)) {
            case DownloadManager.STATUS_SUCCESSFUL:
                Log.d(Settings.TAG_APP, "Download successfully completed.");
            break;

            case DownloadManager.STATUS_FAILED:
                int columnReasonIndex = cur.getColumnIndex(DownloadManager.COLUMN_REASON);
                Log.d(Settings.TAG_APP, "Download failed with error: " + cur.getInt(columnReasonIndex));
            break;
        }

    }

    cur.close();
    cur = null;
}

我发现另外2个问题以某种方式连接到我的问题，但没有答案： Android - Overwrite files when downloading via Download Manager
How can i make download manager overwrite an exisiting file instead of renaming the file in android

Android DownloadManager永远不会返回ERROR_FILE_ALREADY_EXISTS

0 个答案: