DownloadActivity

public class DownloadActivity extends Activity{
    private List<FileDownload> datasource;
    private ListView lstDownloadFiles;
    private DownloadFilesAdapter adapter;
    private boolean receiversRegistered


    private final BroadcastReceiver mDownloadingProgressReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            Ln.d("onRecevice");

            if (DownloadService.DOWNLOAD_ACTION.equals(intent.getAction())) {
                FileDownload result = (FileDownload) intent.getSerializableExtra(DownloadService.NOTIFY_RESULT_DATA);
                int progress = intent.getIntExtra(DownloadService.NOTIFY_RESULT_PROGRESS, -1);
                if(result == null || progress == -1 || adapter == null){
                    return;
                }

                // update adapter here
            }
        }
    };

    public void onStart() {
        super.onStart();
        registerReceiver();
    };

    @Override
    public void onStop() {
        super.onStop();
        unregisterReceiver();
    }

    private void registerReceiver() {
        unregisterReceiver();
        IntentFilter intentToReceiveFilter = new IntentFilter();
        intentToReceiveFilter.addAction(DownloadService.DOWNLOAD_ACTION);
        LocalBroadcastManager.getInstance(this).registerReceiver(mDownloadingProgressReceiver, intentToReceiveFilter);
        receiversRegistered = true;
    }

    private void unregisterReceiver() {
        if (receiversRegistered) {
            LocalBroadcastManager.getInstance(this).unregisterReceiver(mDownloadingProgressReceiver);
            receiversRegistered = false;
        }
    }
}