android - 来自通知的 Activity 中收到错误的 Intent (在服务中)

Question

我有一个非常奇怪的问题。我编写了一个带有 2 个由线程调用的 SimpleNotifications 的服务，但是当我单击它们以启动 DestinationActiviy 时，我发现收到的 Intent 包含上次单击的通知的额外信息。

例如: 步骤 1) 调用 SimpleNotification 2 步骤 2) 调用 SimpleNotification 1 步骤 3) 点击 SimpleNotification 2

结果:DestinationActivity 显示:“SimpleNotification1”

你能告诉我为什么吗？我真的很惊讶......

这是我的服务代码:

public class MyLocalService extends Service {

private final static String LOG_TAG = "MyLocalService";

private final static int MAX_NOTIFICATION_NUMBER = 10;

private final static int SIMPLE_NOTIFICATION_ID = 1;

private NotificationManager notificationManager;        

private BackgroundThread backgroundThread;

private Notification notification;

private PendingIntent pIntent;
private int notificationNumber;
private PendingIntent pIntent2;
private Intent intent;
private Intent intent2;

@Override
public void onCreate() {
        super.onCreate();
        backgroundThread = new BackgroundThread();
        backgroundThread.start();
        notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        Log.i(LOG_TAG, "Service Created");

}

public void sendNotification1(){
        notification = new Notification(R.drawable.icon,"Simple Notification1", System.currentTimeMillis());            
        notification.flags |= Notification.FLAG_AUTO_CANCEL;
        intent = new Intent(this, DestinationActiviy.class);
        intent.putExtra("notificationType", "Simple Notification1");
        pIntent = PendingIntent.getActivity(this, 0, intent,PendingIntent.FLAG_UPDATE_CURRENT);     
        notificationNumber++;
        notification.number=notificationNumber;
        notification.setLatestEventInfo(this, "Simple Notification1","Simple Notification Extended", pIntent);
        notificationManager.notify(1, notification);
}

public void sendNotification2(){
        // Creiamo la Notification
        notification = new Notification(R.drawable.icon,"Simple Notification2", System.currentTimeMillis());            
        notification.flags |= Notification.FLAG_AUTO_CANCEL;
        intent2 = new Intent(this, DestinationActiviy.class);
        intent2.putExtra("notificationType", "Simple Notification2");
        pIntent2 = PendingIntent.getActivity(this, 0, intent2,PendingIntent.FLAG_UPDATE_CURRENT);     
        notificationNumber++;
        notification.number=notificationNumber;
        notification.setLatestEventInfo(this, "Simple Notification2","Simple Notification Extended", pIntent2);
        notificationManager.notify(2, notification);
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i(LOG_TAG, "Service Started");
        notificationNumber = 0;
        return super.onStartCommand(intent, flags, startId);
}

@Override
public void onDestroy() {
        backgroundThread.running = false;
        super.onDestroy();
        Log.i(LOG_TAG, "Service Destroyed");
}

@Override
public IBinder onBind(Intent arg0) {
        return null;
}


private final class BackgroundThread extends Thread {
        private final static long MIN_DELAY = 2000L;            
        private final static long MAX_RANDOM_DELAY = 10000L;
        public boolean running= true;
        public void run() {
                Log.i(LOG_TAG, "BackgroundThread Started");                     
                Random random = new Random();
                while(running && notificationNumber<MAX_NOTIFICATION_NUMBER){
                        long randomDelay = MIN_DELAY + Math.abs(random.nextInt() %MAX_RANDOM_DELAY);
                        Log.i(LOG_TAG, "Delay is (ms) "+randomDelay);
                        try{
                                Thread.sleep(randomDelay);
                                }
                        catch(InterruptedException ie){

                        }
                        sendNotification2();
                        sendNotification1();
                }
                stopSelf();
        }
}
}

服务从 MainActivity 开始:

public class LocalServiceTestActivity extends Activity {

private Intent serviceIntent;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    serviceIntent = new Intent(this,MyLocalService.class);
}

public void startLocalService(View button){
    startService(serviceIntent);
}

public void stopLocalService(View button){
    stopService(serviceIntent);
}    
}

和 DestinationActivity:

public class DestinationActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.notification_activity);
    // Otteniamo le informazioni associate all'Intent
    Bundle extras = getIntent().getExtras();
    if (extras != null) {
        TextView textView = (TextView) findViewById(R.id.outputView);
        textView.setText(extras.getString("notificationType"));
    }
}

}

我也尝试过使用相同的 Intent，使用相同的 pendingIntent 和相同的通知，反之亦然，使用不同的 Intent，pendingIntent(就像这段代码)...我不知道如何解决这个问题。请帮助我，谢谢。

Answer 1

当您在这里为第二个 Notification 创建 PendingIntent 时:

pIntent2 = PendingIntent.getActivity(this, 0, 
                intent2,PendingIntent.FLAG_UPDATE_CURRENT);     

您指定了 PendingIntent.FLAG_UPDATE_CURRENT 标志。因为第二个 Notification 和第一个 Notification 是“相同的”(即:它们是同一个 Activity 的 Intents)，所以此标志阻止创建新的 PendingIntent。相反，它只会导致现有的 PendingIntent 被新的 Extras 修改。参见 documentation for PendingIntent .

那么您得到的是 2 个共享相同 PendingIntent 的通知。无论您选择哪一个通知，您总是会从第二个通知中获得附加功能。