How to know when activity is laid out?

Issue

I've got a mapview that I want to put some markers on top of. I'll retrieve these from a webservice when I start the activity, so I need to know the minimum and maximum lat/lng pairs for the current viewport. I'm calling

mMapView.getWidth()
mMapView.getHeight()

But they both return 0 while the activity is starting. I tried putting it in onAttachedToWindow, onResume, onPostCreate, onPostResume, onStart and so on, but to no avail. How can I know that the activity has finished laying out all the views and is ready to give me the correct height and width measurements?

Solution

I think you have to override onSizeChanged and call getWidth/Height from there. Be aware though that onSizeChanged might get called multiple times during your activity's lifecycle (Everytime the size of the view changes).

Answered By - Julien