Android - DownloadManager/BroadcastReceiver多次调用

Question

我正在使用DownloadManager来处理我的应用程序中的下载,我想在下载完成时通知用户.

我正在使用运行良好的下面的代码

 public void downloaddownload(View v){
        View v2 = (View) v.getParent();
        TextView urlView = (TextView) v2.findViewById(R.id.url);
        String urlString = (String) urlView.getText().toString();
        TextView artistView2 = (TextView) v2.findViewById(R.id.artist);
        final String artistString = (String) artistView2.getText().toString();
        TextView titleView2 = (TextView) v2.findViewById(R.id.title);
        final String titleString = (String) titleView2.getText().toString();

        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(urlString));
        request.setDescription(titleString);
        request.setTitle(artistString);
        // in order for this if to run, you must use the android 3.2 to compile your app
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            request.allowScanningByMediaScanner();
            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
        }
        request.setDestinationInExternalPublicDir(Environment.DIRECTORY_MUSIC + "/folder", titleString + " - " + artistString + ".mp3");

        Toast.makeText(mainContext, "Downloading " + titleString + " - " + artistString, Toast.LENGTH_SHORT).show();

        // get download service and enqueue file
        DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
        manager.enqueue(request);

        onComplete = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                // TODO Auto-generated method stub
                Toast.makeText(mainContext, "Download \" " + titleString + " - " + artistString + "\" completed", Toast.LENGTH_LONG).show();
            }
         };

         registerReceiver(onComplete, new IntentFilter(
                    DownloadManager.ACTION_DOWNLOAD_COMPLETE));


    }

问题是onReceive方法也被调用以用于以前的下载.

假设我下载a.mp3,b.mp3和c.mp3,当a.mp3完成后我收到a.mp3完成,当b.mp3完成时我收到a.mp3完成,然后是新的吐司b.mp3完成了...

我怎么能阻止这个？谢谢.

Answer 1

哟BroadcastReceiver每次下载文件时都会注册.这意味着,第二次下载文件时,您将注册两个接收器.您可能应该unregisterReceiver()在完成工作后(可能在onReceive())中取消注册它们.