Returning Back To The Previous Application?

I have following two applications, A & B. Application A has a service which waits for application B to come in foregrouond. Now, when application B comes in foreground, service

Solution 1:

From the docsFLAG_ACTIVITY_REORDER_TO_FRONT:

IntentLaunchIntent= m_context.getPackageManager().getLaunchIntentForPackage(packageNameOfAppB);
LaunchIntent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
startActivity(LaunchIntent);

NOTE:Works only if the application B was launched before and in activity history stack.