Android 获取NavigationBar高度

使用方法如下：

Point point = getNavigationBarSize(this);bottomHeight = point.y; if (bottomHeight > 0) {     //有NavigationBar }

public static Point getNavigationBarSize(Context context) {        Point appUsableSize = getAppUsableScreenSize(context);        Point realScreenSize = getRealScreenSize(context);        // navigation bar on the right        if (appUsableSize.x < realScreenSize.x) {            return new Point(realScreenSize.x - appUsableSize.x, appUsableSize.y);        }        // navigation bar at the bottom        if (appUsableSize.y < realScreenSize.y) {            return new Point(appUsableSize.x, realScreenSize.y - appUsableSize.y);        }        // navigation bar is not present        return new Point();    }    @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)    public static Point getAppUsableScreenSize(Context context) {        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);        Display display = windowManager.getDefaultDisplay();        Point size = new Point();        display.getSize(size);        return size;    }    public static Point getRealScreenSize(Context context) {        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);        Display display = windowManager.getDefaultDisplay();        Point size = new Point();        if (Build.VERSION.SDK_INT >= 17) {            display.getRealSize(size);        } else if (Build.VERSION.SDK_INT >= 14) {            try {                size.x = (Integer) Display.class.getMethod("getRawWidth").invoke(display);                size.y = (Integer) Display.class.getMethod("getRawHeight").invoke(display);            } catch (IllegalAccessException e) {            } catch (InvocationTargetException e) {            } catch (NoSuchMethodException e) {            }        }        return size;    }

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