How to handle notch(display cutout) in android API lower than 28?

Question

Android added notch support on API 28, but how to handle it on devices running API 27 (Honor 10, Huawei P20, etc.) ?

I was trying to use DisplayCutoutCompat<

Answer 1

I had similar issue, and had to use reflection to access what I need. My problem was that I had some calculations depending on screen size and while not accessing the notch space, the calculations were wrong and code didn't work well.

    public static final String CLASS_DISPLAY_CUTOUT = "android.view.DisplayCutout";
    public static final String METHOD_GET_DISPLAY_CUTOUT = "getDisplayCutout";
    public static final String FIELD_GET_SAFE_INSET_TOP = "getSafeInsetTop";
    public static final String FIELD_GET_SAFE_INSET_LEFT = "getSafeInsetLeft";
    public static final String FIELD_GET_SAFE_INSET_RIGHT = "getSafeInsetRight";
    public static final String FIELD_GET_SAFE_INSET_BOTTOM = "getSafeInsetBottom";


    try {
            WindowInsets windowInsets = activity.getWindow().getDecorView().getRootWindowInsets();
            if (windowInsets == null) {
                return;
            }
            Method method = WindowInsets.class.getMethod(METHOD_GET_DISPLAY_CUTOUT);
            Object displayCutout = method.invoke(windowInsets);
            if (displayCutout == null) {
                return;
            }
            Class clz = Class.forName(CLASS_DISPLAY_CUTOUT);
            int top = (int) clz.getMethod(FIELD_GET_SAFE_INSET_TOP).invoke(displayCutout);
            int left = (int) clz.getMethod(FIELD_GET_SAFE_INSET_LEFT).invoke(displayCutout);
            int right = (int) clz.getMethod(FIELD_GET_SAFE_INSET_RIGHT).invoke(displayCutout);
            int bottom = (int) clz.getMethod(FIELD_GET_SAFE_INSET_BOTTOM).invoke(displayCutout);
            Rect rect = new Rect(left, top, right, bottom);

        } catch (Exception e) {
            Log.e(TAG, "Error when getting display cutout size");
        }