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>