意圖不會去我的登錄屏幕在其他塊

Question

這裏意圖不去登錄課時，否則條件爲真，和應用程序崩潰。我不知道爲什麼應用程序崩潰，如果我在其他屏幕上刪除了intent方法，那麼應用程序不會崩潰，但是當其他條件成立時我想要登錄屏幕，我在這裏錯過了什麼，請幫助我。

public class GcmMessageHandler extends IntentService { 
    PendingIntent alarmIntent; 
    GoogleCloudMessaging gcm; 
    String regid; 
    SessionManager session; 

    NotificationManager nm; 
    static int UniqueID=2154; 

    String mes,message,call,detailid,platform,service,alert,userid; 
    int U_ID=0; 

    private Handler handler; 
    public GcmMessageHandler() { 
     super("GcmMessageHandler"); 
    } 

    @Override 
    public void onCreate() { 
     super.onCreate(); 
     handler = new Handler(); 
    } 

    @Override 
    protected void onHandleIntent(Intent intent) { 
     Bundle extras = intent.getExtras(); 

     /** 
     * Get stored session data userid from other class 
     * */ 
     userid = ""; 
     session = new SessionManager(getApplicationContext()) 
     HashMap<String, String> user = session.getUserDetails(); 
     userid = user.get(SessionManager.KEY_userid); 

     if(userid != null && ! userid.trim().isEmpty()) 
     { 
      U_ID = Integer.parseInt(userid); 
      Toast.makeText(GcmMessageHandler.this, "converted="+U_ID, Toast.LENGTH_LONG).show(); 
     } 

     GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(this); 

     String messageType = gcm.getMessageType(intent); 


     alert = extras.getString("alert"); 
     message = extras.getString("message"); 
     call = extras.getString("call"); 
     detailid = extras.getString("id"); 
     platform = extras.getString("platform"); 
     service = extras.getString("service"); 

     showToast(); 
     //Log.i("GCM", "Received : (" +messageType+") "+extras.getString("title")); 

     GcmBroadcastReceiver.completeWakefulIntent(intent); 
     nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); 
    } 

    public void showToast(){   
     handler.post(new Runnable() { 

      @TargetApi(Build.VERSION_CODES.JELLY_BEAN) 
      @SuppressLint("NewApi") 
      public void run() { 
       Uri alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION); 
       //builder.setSound(alarmSound); 

       long[] vibrate = { 0, 100, 200, 300 }; 

       NotificationManager mNotificationManager; 
       NotificationCompat.Builder builder; 
       mNotificationManager = (NotificationManager) GcmMessageHandler.this.getSystemService(Context.NOTIFICATION_SERVICE); 

       if(call.equalsIgnoreCase("newsletter")){ 
        Intent intent = new Intent(GcmMessageHandler.this, Webview_news.class);   
        intent.putExtra("id",detailid); 
        intent.putExtra("platform",platform); 
        intent.putExtra("service",service); 
        alarmIntent = PendingIntent.getActivity(GcmMessageHandler.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);  
       } 

       if(U_ID>0){ 
        if(call.equalsIgnoreCase("tipdetail")) { 
         Intent intent = new Intent(GcmMessageHandler.this, Selection.class);   
         intent.putExtra("id",detailid); 
         intent.putExtra("platform",platform); 
         intent.putExtra("service",service); 
         alarmIntent = PendingIntent.getActivity(GcmMessageHandler.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);  
        } 
        else if(call.equalsIgnoreCase("offers")) { 
         Intent intent = new Intent(GcmMessageHandler.this, Selection.class);   
         //intent.putExtra("sms",message); 
         intent.putExtra("id",detailid); 
         intent.putExtra("platform",platform); 
         intent.putExtra("service",service); 
         alarmIntent = PendingIntent.getActivity(GcmMessageHandler.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);  
        } 
       } 
       else if(userid==null || userid.equals("0")) { 
        Toast.makeText(getApplicationContext(),"welcome to login class", Toast.LENGTH_LONG).show(); 

        //Here in intent app goes crashed and not going to login screen, this is my problem 
        Intent intent2 = new Intent(GcmMessageHandler.this, Login.class); 
        startActivity(intent2); 
       } 


       NotificationCompat.Builder mBuilder = 
        new NotificationCompat.Builder(GcmMessageHandler.this) 
          .setSmallIcon(R.drawable.notify) 
          .setContentTitle(alert) 
          .setStyle(new NotificationCompat.BigTextStyle() 
          .bigText(message)) 
          .setSound(alarmSound) 
          .setVibrate(vibrate) 
          .setAutoCancel(true) 
          .setContentText(call); 

       mBuilder.setContentIntent(alarmIntent); 
       // Notification note = mBuilder.build(); 
       // note.defaults |= Notification.DEFAULT_VIBRATE; 

       Notification notification = new Notification(); 
       notification. defaults |= Notification.DEFAULT_VIBRATE; 

       UniqueID++; 
       mNotificationManager.notify(UniqueID, mBuilder.build()); 
      } 
     }); 
    } 
} 

在else塊控制進入其他條件塊時，然後應用程序崩潰。如果我刪除了這個「Intent intent2 = new Intent（GcmMessageHandler.this，Login.class）; startActivity（intent2）;」。那麼應用程序不會崩潰，但不去登錄屏幕，只是目的是，我想轉到登錄屏幕上別的博克。在這裏我正在實施通知的GCM，並且我只是在這裏寫下必要的代碼。

這裏是錯誤的logcat：

11-02 11:16:46.690: D/AndroidRuntime(30389): Shutting down VM 
    11-02 11:16:46.690: W/dalvikvm(30389): threadid=1: thread exiting with uncaught exception (group=0x411ae2e8) 
    11-02 11:16:46.760: E/AndroidRuntime(30389): FATAL EXCEPTION: main 
    11-02 11:16:46.760: E/AndroidRuntime(30389): android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want? 
    11-02 11:16:46.760: E/AndroidRuntime(30389):  at android.app.ContextImpl.startActivity(ContextImpl.java:1106) 
    11-02 11:16:46.760: E/AndroidRuntime(30389):  at android.app.ContextImpl.startActivity(ContextImpl.java:1100) 
    11-02 11:16:46.760: E/AndroidRuntime(30389):  at android.content.ContextWrapper.startActivity(ContextWrapper.java:305) 
    11-02 11:16:46.760: E/AndroidRuntime(30389):  at notification.GcmMessageHandler$1.run(GcmMessageHandler.java:173) 
    11-02 11:16:46.760: E/AndroidRuntime(30389):  at android.os.Handler.handleCallback(Handler.java:615) 
    11-02 11:16:46.760: E/AndroidRuntime(30389):  at android.os.Handler.dispatchMessage(Handler.java:92) 
    11-02 11:16:46.760: E/AndroidRuntime(30389):  at android.os.Looper.loop(Looper.java:174) 
    11-02 11:16:46.760: E/AndroidRuntime(30389):  at android.app.ActivityThread.main(ActivityThread.java:4952) 
    11-02 11:16:46.760: E/AndroidRuntime(30389):  at java.lang.reflect.Method.invokeNative(Native Method) 
    11-02 11:16:46.760: E/AndroidRuntime(30389):  at java.lang.reflect.Method.invoke(Method.java:511) 
    11-02 11:16:46.760: E/AndroidRuntime(30389):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027) 
    11-02 11:16:46.760: E/AndroidRuntime(30389):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794) 
    11-02 11:16:46.760: E/AndroidRuntime(30389):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

添加新任務啓動模式。

Intent intent2 = new Intent(GcmMessageHandler.this, Login.class); 
intent2.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); // add this flag 
startActivity(intent2);