quartz/content/vault/android/back button.md

#cs240 #android

Sometimes the back button in the app bar is for going to a parent activity, not just the last one. Define that in the AndroidManifest.xml:

<activity
	name..
	label..
	android:parentActivityName=".ui.MainActivity"

Use the following code right after setting up the app bar:

getSupportActionBar().setDisplayHomeAsUpEnabled(true);

To make sure that the main activity isn't restarted upon return, write the following in the main activity's manifest entry.

<activity
	name...
	label...
	android:launchMode="singleTop">