Bring application to front after user clicks on home button

by 
Intent intent = new Intent(context, MyRootActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_SINGLE_TOP);
startActivity(intent);

You should use your starting or root activity for MyRootActivity.

This will bring an existing task to the foreground without actually creating a new Activity. If your application is not running, it will create an instance of MyRootActivity and start it.

EDIT

I added Intent.FLAG_ACTIVITY_SINGLE_TOP to Intent to make it really work!

Second EDIT

There is another way to do this. You can simulate the “launching” of the app the same way that Android launches the app when the user selects it from the list of available apps. If the user starts an application that is already running, Android just brings the existing task to the foreground (which is what you want). Do it like this:

Intent intent = new Intent(context, SplashScreen.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); // You need this if starting
                                                //  the activity from a service
intent.setAction(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
startActivity(intent);

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