How to open Gmail Compose when a button is clicked in Android App?

Question

I am trying to open up Gmail Compose screen when a button is clicked in my Android App. Do I need some API key for this from Google? or what do I need to do in my button onC

Answer 1

if you don't get anything in this line

final List matches = pm.queryIntentActivities(intent, 0);

then replace this line with

final List matches = pm.queryIntentActivities(intent, 1);