Android - Is there any event triggered when activity.setContentView has finished rendering?

I'm trying to get values from myImageView.getImageMatrix() method once my activity is ready. I tried using the onCreate() , onStart() , onResume() methods but the matrix I get is the default.

If I call myImageView.getImageMatrix() triggered by an OnClickListener, after my activity is visible, I get the right values.

Just to be more clear:

• calling getImageMatrix onStart = Matrix{[1.0, 0.0, 0.0][0.0, 1.0, 0.0][0.0, 0.0, 1.0]}

• calling getImageMatrix onClick = Matrix{[0.77488154, 0.0, 7.6717987][0.0, 0.77488154, 0.0][0.0, 0.0, 1.0]}