设置沉浸状态栏的方法

    private void steepStatusBar() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            // 透明状态栏
            getWindow().addFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            // 透明导航栏
            getWindow().addFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
        }
    }