View.onDraw() — when does it get called?

Question

I put a Log.d() call into the onDraw() of my extended View, so I could see how often and when it\'s getting called. It gets called upon instantiation of the view, which is

Answer 1

onDraw() is called when invalidate() is called.

But you should know for ViewGroups: onDraw() will not be called like you expect. Rather, onDispatchDraw().

However, in a ViewGroup you can call setWillNotDraw(false) in the constructor to make onDraw() to be called on invalidate().

Take a look at this answer