未收到通知的PendingIntent

Question

我得到了一个IntentService，它在onHandleIntent(Intent)中同步地做一些长时间运行的工作。只要服务运行，我就会显示通知。现在我想在用户点击通知后停止服务。

这就是我得到的。创建服务后注册的广播接收者类。当服务完成某些工作时显示的带有挂起意图的通知。

但不知何故，当用户点击通知时，我从未获得广播意图。任何想法?

这部分代码可以很容易地用于测试。

public class SyncService extends IntentService
        {
    private static final String TAG = SyncService.class.getSimpleName();
    private static final int NOTIFICATION_REF_ID = 1;
    private static final String ACTION_CANCEL = TAG + ".CANCEL";
    private CancelReceiver receiver;
    public SyncService() {
        super(SyncService.class.getSimpleName());
    }
    private class CancelReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            stopSelf();
        }
    }
    @Override
    public void onCreate() {
        super.onCreate();
        receiver = new CancelReceiver();
        IntentFilter filter = new IntentFilter(ACTION_CANCEL);
        registerReceiver(receiver, filter);
    }
    @Override
    public void onDestroy() {
        super.onDestroy();
        if (receiver != null)
            unregisterReceiver(receiver);
    }
    @Override
    protected void onHandleIntent(Intent intent) {
        Intent cancelIntent = new Intent(this, CancelReceiver.class);
        cancelIntent.setAction(ACTION_CANCEL);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0,
                cancelIntent, 0);
        // create notification and set pending-intent
        Notification.Builder builder = new Notification.Builder(this);
        builder.setContentTitle("some caption")
                .setContentText("some hint")
                .setTicker("some caption").setSmallIcon(R.drawable.ic_action_refresh)
                .setOngoing(true).setWhen(System.currentTimeMillis())
                .setContentIntent(pendingIntent).setProgress(0, 0, true);
        Notification notification;
        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1)
            notification = builder.getNotification();
        else
            notification = builder.build();
        // show notification
        NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        manager.notify(SyncService.class.getCanonicalName(), NOTIFICATION_REF_ID,
                notification);

        // now do some long running work synchronously

        // cancel/remove notification
        NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        manager.cancel(SyncService.class.getCanonicalName(), NOTIFICATION_REF_ID);
    }
}

服务从我的活动中启动:

        Intent syncIntent = new Intent(this, SyncService.class);
        startService(syncIntent);

像这样停止服务的想法来自这篇文章。

Answer 1

变化

Intent cancelIntent = new Intent(this, CancelReceiver.class);

Intent cancelIntent = new Intent();

虽然onReceive()将被调用，而stopSelf()将调用onDestroy()，但计划的工作将继续进行，直到完成。要处理此问题，请向同步类添加

private boolean cancelled = false;

在onReceive中设置为true，并且在您的"一些长时间同步运行的工作"中定期检查cancelled并爆发