Android accurately obtains the screen size (e.g. 3.5, 4.0, 5.0 inch screen)

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    public static double getScreenPhysicalSize(Activity ctx) {
            DisplayMetrics dm = new DisplayMetrics();
            ctx.getWindowManager().getDefaultDisplay().getMetrics(dm);
            double diagonalPixels = Math.sqrt(Math.pow(dm.widthPixels,2) + Math.pow(dm.heightPixels,2));
            return diagonalPixels / (160 * dm.density);
        }