Get size of frame in ActivityFragment

I am trying to get the size of fragment in my FrameLayout with this code:

setContentView(R.layout.main);
    frame=(FrameLayout)findViewById(R.id.fragment1);

       frame.getViewTreeObserver().addOnGlobalLayoutListener( 
                new OnGlobalLayoutListener(){
                    @Override
                    public void onGlobalLayout() {                   
                        width=frame.getWidth();
                        height = frame.getHeight(); 

                        frame.getViewTreeObserver().removeGlobalOnLayoutListener( this );                               
                    }

            }); 

this works, but for the first call of main I get 0, zero value? and on the other calls i get the value from the layout view before.

lets say the fragment is PORTRAIT: 100 x 200, and LAND: 200:300 when I call the activityfragment in portrait first time i get 0 x 0 when i turn my device (LAND) i get 100 x 200 (the value for portrait)

my width and height are like this in main:

public static int height;
    public static int width;

I think the problem is, the code works but the fragment1 Fragment Code get's the widht/height value earlier than the values are saved in main... like this

height.setText(String.valueOf(MainActivity.height));
width.setText(String.valueOf(MainActivity.widht));

EDIT:

It's not because of values are saved to late... i tested it.. it's because the first value of size is 0 x 0. hmm