Android DownloadManager get filename

问题:

In my app you can download some files. I used the Android DownloadManager class for downloading. After the download is completed, it should show me a message that the file was downloaded. The problem is, there could be 2,3 or 4 downloads at the same time. My BroadcastReceiver code looks like this:

receiver_complete = new BroadcastReceiver(){
         @Override
          public void onReceive(Context context, Intent intent) {
             String action = intent.getAction();
                if (action.equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE) ){
                    Toast.makeText(MainActivity.this, MainActivity.this.getString(R.string.download_finished, "Here should be the name", Toast.LENGTH_SHORT).show();
                }
         }
     };

How can I get the current filename of the finished download?

Thank you very much.

回答1:

I think you want to put something like this inside your if block. Replace YOUR_DM with your DownloadManager instance.

Bundle extras = intent.getExtras();
DownloadManager.Query q = new DownloadManager.Query();
q.setFilterById(extras.getLong(DownloadManager.EXTRA_DOWNLOAD_ID));
Cursor c = YOUR_DM.query(q);

if (c.moveToFirst()) {
    int status = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));
    if (status == DownloadManager.STATUS_SUCCESSFUL) {
        // process download
        title = c.getString(c.getColumnIndex(DownloadManager.COLUMN_TITLE));
        // get other required data by changing the constant passed to getColumnIndex
    }
}

回答2:

Ian Shannon was totally right with his answer, but I sugest some improvement:

• Remember to close that Cursor after using it, avoiding "Cursor Leaking". This Cursor consumes a lot of resources and must be released as soon as possible.

• If you put some title for the download, such as:

  DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
  request.setTitle("Some title");
  

  The value given by the DownloadManager.COLUMN_TITLE will be "Some title" instead of the file name. So I would recommend this instead:

  String filePath = c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME));
  title = filePath.substring( filePath.lastIndexOf('/')+1, filePath.length() );
  

  The COLUMN_LOCAL_FILENAME returns the entire path (/storage/sdcard0/Android/data/.../filename.ext), but with this code, we will only get the file name.

Final code:

Bundle extras = intent.getExtras();
DownloadManager.Query q = new DownloadManager.Query();
q.setFilterById(extras.getLong(DownloadManager.EXTRA_DOWNLOAD_ID));
Cursor c = YOUR_DM.query(q);

if (c.moveToFirst()) {
    int status = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));
    if (status == DownloadManager.STATUS_SUCCESSFUL) {
        String filePath = c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME));
        filename = filePath.substring( filePath.lastIndexOf('/')+1, filePath.length() );
    }
}
c.close();

Edit: Replace YOUR_DM with your DownloadManager instance.

回答3:

I think what you are looking for is the DownloadManager.COLUMN_TITLE

Here is a link to the Android Documents: http://developer.android.com/reference/android/app/DownloadManager.html#COLUMN_TITLE

And here is a tutorial that will explain more than just getting the title. It is for downloading an image from a URL and then displaying it in an application. Mighty useful I think, overall speaking.

http://wptrafficanalyzer.in/blog/downloading-an-image-from-an-http-url-using-downloadmanager-and-displaying-in-imageview-by-dynamically-registered-broadcastreceiver/

回答4:

u try this code to get the file name

DownloadManager.COLUMN_LOCAL_FILENAME

i am not sure about it