I've just read about the Android APIs called Assist and VoiceInteraction. What I'm trying to achieve is an app like NowOnTap. For this, I need an access to the screen's content before the user long presses the home button.
First, I tried using a normal activity with the android.intent.action.ASSIST action.
Digging more into this, I found out that in order to access a screenshot before opening the apps, I need to implement VoiceInteractionSession and its methods onCreateContentView and onHandleScreenshot.
I wasn't able to create UI by using onCreateContentView and, according to my logs, it doesn't even gets called. Anyone with experience using this APIs?