Get screen width and height in Android

How can I get the screen width and height and use this value in:

@Override protected void onMeasure(int widthSpecId, int heightSpecId) {
    Log.e(TAG, "onMeasure" + widthSpecId);
    setMeasuredDimension(SCREEN_WIDTH, SCREEN_HEIGHT - 
        game.findViewById(R.id.flag).getHeight());
}