後通知延遲

我試圖通過AlarmManager延遲通知。爲了這個目的，我創建了目前看起來像這樣的AlarmReciever：我創建了一個TestActivty，我嘗試啓動這樣一個報警後通知延遲

public class NotificationAlarmReciever extends BroadcastReceiver{ 

public static final String TAG = "NotificationAlarmReciever"; 

public static final String KEY_NOTIFICATION_EXTRA = "NotificationExtra"; 
public static final String KEY_NOTIFICATION_ID = "NotificationId"; 


@Override 
public void onReceive(Context context, Intent intent) { 
    LogCat.d(TAG, "AlarmReciever Triggered"); 
    LogIntent(intent); 
    Bundle b = intent.getExtras(); 
    if (b != null){ 
     if (b.containsKey(KEY_NOTIFICATION_EXTRA)){ 
      Notification n = b.<Notification>getParcelable(KEY_NOTIFICATION_EXTRA); 
        int request = 100 
        if(b.containsKey(KEY_NOTIFICATION_ID)){ 
         request = b.getInt(KEY_NOTIFICATION_ID) 
        } 
      NotificationManager manager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE); 
      manager.notify(request, n); 
     } 
    } 
} 

private void LogIntent(Intent intent) { 
    //logs Intent.... 

} 
}

：

public void onClick(View v) { 
      Context c = getApplicationContext(); 
      int requestCode = 333; 

      Notification notification = new Notification(R.drawable.balloon_overlay_close,"ticker", System.currentTimeMillis() + Integer.parseInt(mWhen.getText().toString())); 
      Intent notificationAction = new Intent(c, TestActivity.class); 
      PendingIntent notificationPendingOperation = PendingIntent.getActivity(c, requestCode, notificationAction, 0); 
      notification.setLatestEventInfo(c, "HEADER", "MESSAGE", notificationPendingOperation); 

      AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE); 
      Intent alarmIntent = new Intent(c, NotificationAlarmReciever.class); 
      alarmIntent.putExtra(NotificationAlarmReciever.KEY_NOTIFICATION_EXTRA, notification); 
      PendingIntent alarmOperation = PendingIntent.getBroadcast(c, requestCode, alarmIntent, PendingIntent.FLAG_UPDATE_CURRENT); 
//Line 127 
      alarmManager.set(requestCode, notification.when, alarmOperation); 
}

只要alarmManager.set叫我得到一個NullPointerException異常說：

08-01 16:37:15.592: ERROR/AndroidRuntime(4422): FATAL EXCEPTION: main 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422): java.lang.NullPointerException 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422):  at android.os.Parcel.readException(Parcel.java:1328) 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422):  at android.os.Parcel.readException(Parcel.java:1276) 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422):  at android.app.IAlarmManager$Stub$Proxy.set(IAlarmManager.java:174) 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422):  at android.app.AlarmManager.set(AlarmManager.java:139) 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422):  at de.eos.uptrade.android.core.TestActivity$1.onClick(TestActivity.java:127) 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422):  at android.view.View.performClick(View.java:2485) 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422):  at android.view.View$PerformClick.run(View.java:9080) 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422):  at android.os.Handler.handleCallback(Handler.java:587) 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422):  at android.os.Handler.dispatchMessage(Handler.java:92) 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422):  at android.os.Looper.loop(Looper.java:130) 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422):  at android.app.ActivityThread.main(ActivityThread.java:3683) 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422):  at java.lang.reflect.Method.invokeNative(Native Method) 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422):  at java.lang.reflect.Method.invoke(Method.java:507) 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
08-01 16:37:15.592: ERROR/AndroidRuntime(4422):  at dalvik.system.NativeStart.main(Native Method)

我不知道，我做錯了什麼。

來源

2011-08-01 Rafael T

你在onclick方法中得到了一個nullpointerexception。請確定發生異常的確切行。然後嘗試推斷該行中訪問的對象爲空。然後更新你的問題。 – Marmoy

@videre我的OnClick方法是你看到的第二個 - 我在哪裏創建報警 - 127行是alarmManager.set –

好吧，你知道如何調試嗎？在第127行放置一個斷點，運行應用程序，並在程序到達斷點時，將光標懸停在第127行中的每個對象上，直到找到一個爲空的對象。然後在這裏更新 – Marmoy

看看AlarmManager.set(...) documentation。

在那裏您可以看到第一個參數'type'不能是333.它可以設置爲ELAPSED_REALTIME，ELAPSED_REALTIME_WAKEUP，RTC或RTC_WAKEUP，它們對應於整數值3,2,1和0。選擇。

來源

2011-08-02 05:59:45 Marmoy

thx，那工作...我認爲表達式「NullPointerException」是誤導。「IllegalArgumentException」會更好 –

回答

相關問題