LockScreenOrientation.java

    /**
     * Lock the screen to the current orientation on Android
     * https://stackoverflow.com/questions/4553650/how-to-check-device-natural-default-orientation-on-android-i-e-get-landscape
     * https://stackoverflow.com/a/14150037/959505
     *
     */
    private void lockOrientation() {
        int orientation = 0;
        WindowManager windowService = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
        if (windowService != null) {

            // Assume phone
            int defaultOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
            int defaultReverseOrientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;
            int otherOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
            int otherReverseOrientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;

            Configuration config = getResources().getConfiguration();

            int rotation = windowService.getDefaultDisplay().getRotation();

            if (((rotation == Surface.ROTATION_0 || rotation == Surface.ROTATION_180) &&
                    config.orientation == Configuration.ORIENTATION_LANDSCAPE)
                    || ((rotation == Surface.ROTATION_90 || rotation == Surface.ROTATION_270) &&
                    config.orientation == Configuration.ORIENTATION_PORTRAIT)) {

                // We have a landscape device (tablet, TomTom)
                defaultOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
                defaultReverseOrientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
                otherOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
                otherReverseOrientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;
            }

            switch (rotation) {
                case Surface.ROTATION_0:
                    orientation = defaultOrientation;
                    break;
                case Surface.ROTATION_90:
                    orientation = otherOrientation;
                    break;
                case Surface.ROTATION_180:
                    orientation = defaultReverseOrientation;
                    break;
                case Surface.ROTATION_270:
                    orientation = otherReverseOrientation;
                    break;
            }
            setRequestedOrientation(orientation);
        }
    }