Safe usage of a ViewTreeObserver to get view measurements. This ensures that the layout listener isn't leaked and the right API calls are made.

sample.java

final View view = findViewById(R.id.my_view);
notifyWhenMeasured(view, new OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        int viewWidth = view.getMeasuredWidth();
        int viewHeight = view.getMeasuredHeight();

        // Now you can do the interesting stuff
    }
});

ViewTreeObserverHelper.java

public static void notifyWhenMeasured(final View view, final ViewTreeObserver.OnGlobalLayoutListener listener) {
    ViewTreeObserver vto = view.getViewTreeObserver();
    vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            listener.onGlobalLayout();

            // Need to get a fresh ViewTreeObserver
            ViewTreeObserver freshVto = view.getViewTreeObserver();
            if (Build.VERSION.SDK_INT < 16) {
                // Deprecated because it was inconsistently named
                freshVto.removeGlobalOnLayoutListener(this);
            } else {
                freshVto.removeOnGlobalLayoutListener(this);
            }
        }
    });
}