Determin the screen size of an android device

Screen size

int screenSize = getResources().getConfiguration().screenLayout
                & Configuration.SCREENLAYOUT_SIZE_MASK;
        switch (screenSize) {
            case Configuration.SCREENLAYOUT_SIZE_XLARGE:
                Toast.makeText(this, "Extra large screen", Toast.LENGTH_LONG).show();
                break;
            case Configuration.SCREENLAYOUT_SIZE_LARGE:
                Toast.makeText(this, "Large screen", Toast.LENGTH_LONG).show();
                break;
            case Configuration.SCREENLAYOUT_SIZE_NORMAL:
                Toast.makeText(this, "Normal screen", Toast.LENGTH_LONG).show();
                break;
            case Configuration.SCREENLAYOUT_SIZE_SMALL:
                Toast.makeText(this, "Small screen", Toast.LENGTH_LONG).show();
                break;
            default:
                Toast.makeText(this,
                        "Screen size is neither large, normal or small",
                        Toast.LENGTH_LONG).show();
        }