call activity onCallStateChange from service

Question

I created PhoneStateListener in a Service. Toast messages work fine, but I want to run another Activity on incoming call. But it won't start. What is wrong with this class? Here's a code of main Activity, DialogAct is an empty Activity with layout.

public class GSMListenerService extends Service {
private TelephonyManager tm;

 @Override
 public void onCreate() {
  super.onCreate();

  tm = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
  tm.listen(mPhoneListener, PhoneStateListener.LISTEN_CALL_STATE);
 }

 private PhoneStateListener mPhoneListener = new PhoneStateListener() {
     public void onCallStateChanged(int state, String incomingNumber) {
         try {
             switch (state) {
             case TelephonyManager.CALL_STATE_RINGING:
                 Intent i = new Intent(GSMListenerService.this,DialogAct.class);
                 startActivity(i);
                 Toast.makeText(GSMListenerService.this, "CALL_STATE_RINGING: ", Toast.LENGTH_SHORT).show();

                 break;
             case TelephonyManager.CALL_STATE_OFFHOOK:
                 Toast.makeText(GSMListenerService.this, "CALL_STATE_OFFHOOK", Toast.LENGTH_SHORT).show();
                 break;
             case TelephonyManager.CALL_STATE_IDLE:
                 Toast.makeText(GSMListenerService.this, "CALL_STATE_IDLE", Toast.LENGTH_SHORT).show();
                 break;
             default:
                 Toast.makeText(GSMListenerService.this, "default", Toast.LENGTH_SHORT).show();
                 Log.i("Default", "Unknown phone state=" + state);
             }
        } catch (Exception e) {
            Log.i("Exception", "PhoneStateListener() e = " + e);
        }
    }
};

@Override
public void onDestroy() {
    super.onDestroy();
}

@Override
public void onStart(Intent intent, int startId) {
    super.onStart(intent, startId);
}

@Override
public IBinder onBind(Intent intent) {
    // TODO Auto-generated method stub
    return null;
}
}

Answer 1

Use FLAG_ACTIVITY_NEW_TASK flag.

Intent intent = new Intent(GSMListenerService.this, DialogAct.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);