Question

我创建了一个通过AlarmManager启动的简单状态通知。一切正常（通知内容，标题，点击时启动的活动等）。不幸的是，当调用通知时（即，AlarmManager关闭），将启动并显示空活动。活动只会在状态栏中显示我的应用程序名称及其图标。实际活动本身是空白的。同样，当通知关闭并且第一次出现在状态栏中时会发生这种情况。当我再次点击通知时，它会转到正确的待处理活动。这是我的代码：

以下是设置AlarmManager以调用通知的代码：

//Use AlarmManager to trigger the notification/alarm.
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE); 

//PendingIntent to launch activity when the alarm triggers.                    
Intent intent = new Intent("com.YouForgotWhat.FlightGear.DisplayNotification");

PendingIntent displayIntent = PendingIntent.getActivity(getBaseContext(), 0, intent, 0);   

//Set an alarm to go off at 30 minutes before fuel runs out.
alarmManager.set(AlarmManager.RTC_WAKEUP, endTimeInMillis - (30*60*1000), displayIntent);

这是Notification本身的实际代码（它在另一个Activity中）：

公共类DisplayNotification扩展了SherlockActivity { private Context context = this;

public void onCreate(Bundle paramBundle) {
    super.onCreate(paramBundle);

    NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this);

    mBuilder.setContentTitle("Your fuel may be running low.")
            .setContentText("There are 30 mins left on your timer. Check your fuel gauges.")
            .setSmallIcon(R.drawable.ic_launcher);

    Intent intent = new Intent(this, FuelTimer.class);

    PendingIntent in = PendingIntent.getActivity(getApplicationContext(), 0, intent, 0);
    mBuilder.setContentIntent(in);

    mNotificationManager.notify(0, mBuilder.build());

}

}

我该怎么做才能解决这个问题？谢谢！

Answer 1

你正在启动一个Activity来发出通知，首先你看到一个空的Activity是有意义的 - 这正是你刚推出的。改为使用BroadcastReceiver。

所以当它收到：

public class Receiver extends BroadcastReceiver{
  @Override
  public void onReceive(Context context, Intent intent)
  {
    NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context);

    mBuilder.setContentTitle("Your fuel may be running low.")
      .setContentText("There are 30 mins left on your timer. Check your fuel gauges.")
      .setSmallIcon(R.drawable.ic_launcher);

    Intent intent = new Intent(context, FuelTimer.class);

    PendingIntent in = PendingIntent.getActivity(context, 0, intent, 0);
    mBuilder.setContentIntent(in);

    mNotificationManager.notify(0, mBuilder.build());

   } 
}

您必须将Receiver添加到清单中：

<receiver android:name="com.YouForgotWhat.FlightGear.Receiver" >
            <intent-filter>
                <action android:name="com.YouForgotWhat.FlightGear.DisplayNotification" />
            </intent-filter>
 </receiver>

最后，更改代码以启动接收器，因此就像

//PendingIntent to launch activity when the alarm triggers.                    
Intent intent = new Intent("com.YouForgotWhat.FlightGear.DisplayNotification");

PendingIntent displayIntent = PendingIntent.getBroadcast(getBaseContext(), 0, intent, 0);

NotificationManager启动空活动

1 个答案: