resuming activity in Android using Service

Question

I have a mainActivity .
When starts, it starts a service and bonds it.
There is a timer which will send the mainActivity (this) to back after X seconds, while the service keep running and listening, i use moveTaskToBack (true) .
When the service listener triggered, the service starts the activity, but instead of the activity to be called through onResume() (since it was sent to back) its called through onCreate() , to call the activity currently i use :

Intent dialogIntent = new Intent(getBaseContext(), MainActivity.class);
dialogIntent.addFlags(Intent.FLAG_FROM_BACKGROUND);
getApplication().startActivity(dialogIntent);

Which explains why the activity is created all over again. I tried using FLAG_ACTIVITY_REORDER_TO_FRONT but got an exception.

Answer 1

add this attribute in activity of AndroidManifest.xml android:launchMode="singleInstance" in AndroidManitest.xml

AndroidMenifest.xml

 <application>
        <activity
            android:launchMode="singleInstance"> 
        </activity>
    </application>