Android:多次注册一个接收器

Question

我正在使用DownloadManaegr类从服务器下载Android应用程序。当下载完成时，广播接收器被注册。当接收到DownloadManager.ACTION_DOWNLOAD_COMPLETE意图时，将显示条形图通知。要安装该应用程序，应点击通知。这就是我正在做的：

    DownloadManager dm = (DownloadManager) DownloadApplicationActivity.this.getSystemService(Context.DOWNLOAD_SERVICE);
    DownloadManager.Request req = new DownloadManager.Request(Uri.parse(MY_LINK));
    req.setTitle(MY_TITLE)
                    .setDescription("Downloading ....")
                    // download the package to the /sdcard/downlaod path.
                    .setDestinationInExternalPublicDir(
                            Environment.DIRECTORY_DOWNLOADS,
                            MY_PATH);
            long enqueue = dm.enqueue(req);
    registerReceiver(receiver, new IntentFilter(0DownloadManager.ACTION_DOWNLOAD_COMPLETE));        
    BroadcastReceiver receiver= new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
int id = 0;
            Query query = new Query();
            query.setFilterById(enqueue);
            Cursor c =dm.query(query);
            if (c.moveToFirst()) {
                int columnIndex = c.getColumnIndex(DownloadManager.COLUMN_STATUS);
                if (DownloadManager.STATUS_SUCCESSFUL == c.getInt(columnIndex)) {
                    // show a notification bar.
                    NotificationManager notificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
                    Notification notification = new Notification(R.drawable.icon,"",System.currentTimeMillis());
                    notification.flags |= Notification.FLAG_AUTO_CANCEL;
                    notification.flags |= Notification.FLAG_NO_CLEAR;
                    Intent i = new Intent(Intent.ACTION_VIEW);
                    // when the notification is clicked, install the app.
                            i.setDataAndType(Uri.fromFile(new File(Environment
                                    .getExternalStorageDirectory() + APP_PATH)),"application/vnd.android.package-archive");
                            PendingIntent pendingIntent = PendingIntent.getActivity(
                                    activity, 0, i, 0);
                            notification.setLatestEventInfo(activity, MY_TEXT, MY_TEXT,pendingIntent);
                            notification.number += 1;
                            notificationManager.notify(id++, notification);
                   }
            }           
    }; 

当同时下载两个应用程序时，只显示一个通知-第二个通知-。我错过了第一个。为什么？

Answer 1

因为您使用相同的id调用notify，即在您的案例中为"0"，并且文档说它每次都应该是唯一的。

我认为你应该每次都用不同的数字来代替0。

notificationManager.notify( 0, notification);

以下是文件中的内容。。

public void notify (int id, Notification notification)

发布要在状态栏中显示的通知如果您的应用程序已经发布了具有相同id的通知，但尚未取消，则该通知将被更新的信息所取代