Android: Get the size of the Body Layout Dynamically

Question

I want to get the height/width of the Middle(Body) layout in onCreate() method.

My main.xml is :

Answer 1

Added: This applies for all types of layout. Not only ScrollView.

getWidth() and getHeight() methods returns 0 when layouts width and height are set as match_parent and wrap_content. dimensions are not measured.

The right methods to use to get measured dimensions are getMeasuredWidth() and getMeasuredHeight().

Note: measured dimensions in onCreate method are not initialized yet.

The correct way and place is (snippet can be added anywhere including onCreate):

ScrollView scrollView = (ScrollView)findViewById(R.id.svtest);
ViewTreeObserver vto = scrollView.getViewTreeObserver(); 
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() { 
    @Override 
    public void onGlobalLayout() { 
        if (Build.VERSION.SDK_INT < 16)
            scrollView.getViewTreeObserver().removeGlobalOnLayoutListener(listener);
        else
            scrollView.getViewTreeObserver().removeOnGlobalLayoutListener(listener);

        int width  = scrollView.getMeasuredWidth();
        int height = scrollView.getMeasuredHeight(); 

        // postpone any calculation depend on it to here.
        // regardless what it is. UI or http connection.
    } 
});

Some answers tried to do it onStart() method. but, they tried to call getWidth() and getHeight() methods. Try getMeasuredWidth() and getMeasuredHeight(). it works without adding OnGlobalLayoutListener. The listener is only required if you want to get the dimensions in the on create method. in any later stage the listener is not required because by then the dimensions will be measured(on start for example).