How to get the Display Size in Inches in Android?

Question

I need for my Application the exact inch of a display. My current solution is:

double inch;
double x = Math.pow(widthPix/dm.xdpi,2);
double y = Math.p         


        

Answer 1

Try this.... This will give you the exact size of the display..

static String getDisplaySize(Activity activity) {
    double x = 0, y = 0;
    int mWidthPixels, mHeightPixels;
    try {
        WindowManager windowManager = activity.getWindowManager();
        Display display = windowManager.getDefaultDisplay();
        DisplayMetrics displayMetrics = new DisplayMetrics();
        display.getMetrics(displayMetrics);
        Point realSize = new Point();
        Display.class.getMethod("getRealSize", Point.class).invoke(display, realSize);
        mWidthPixels = realSize.x;
        mHeightPixels = realSize.y;
        DisplayMetrics dm = new DisplayMetrics();
        activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
        x = Math.pow(mWidthPixels / dm.xdpi, 2);
        y = Math.pow(mHeightPixels / dm.ydpi, 2);

    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return String.format(Locale.US, "%.2f", Math.sqrt(x + y));
}