How to get the visible size on an Activity?

I think you'll want to look at Activity.getWindow() and Window.getDecorView(), and get the width/height of that.

I like time-saving answers more:

myActivity.getWindow().getDecorView().getHeight();
myActivity.getWindow().getDecorView().getWidth();

I've found a way to know the exact height of my activity: if you have a view filling all the available screen behind the title bar and the task bar, just use View.getBottom() to get the real height of that activity.