最近在全局搜索里开发一个浏览器，碰到了底部点击新建窗口，闪屏，有时候点击事件还没反应按下去会显示主题，最后发现是对导航栏的处理问题，底部导航栏处理前需要判断是否可见，可见再隐藏，不可见就不用。

    /**
     * 隐藏虚拟按键，并且全屏
     */
    public static void hideBottomUIMenu(AppCompatActivity context,Window window) {
        //隐藏虚拟按键，并且全屏
        if (Build.VERSION.SDK_INT > 11 && Build.VERSION.SDK_INT < 19) { // lower api
            View v = context.getWindow().getDecorView();
            v.setSystemUiVisibility(View.GONE);
        } else if (Build.VERSION.SDK_INT >= 19) {
            //for new api versions.
            View decorView = context.getWindow().getDecorView();

            final int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
            if (isNavBarVisible(window)){
                decorView.setSystemUiVisibility(uiOptions);
            }

        }
    }
    public static boolean isNavBarVisible(@NonNull final Window window) {
        boolean isVisible = false;
        ViewGroup decorView = (ViewGroup) window.getDecorView();
        for (int i = 0, count = decorView.getChildCount(); i < count; i++) {
            final View child = decorView.getChildAt(i);
            final int id = child.getId();
            if (id != View.NO_ID) {
                String resourceEntryName = getResNameById(id);
                if ("navigationBarBackground".equals(resourceEntryName)
                        && child.getVisibility() == View.VISIBLE) {
                    isVisible = true;
                    break;
                }
            }
        }
        if (isVisible) {
            // 对于三星手机，android10以下非OneUI2的版本，比如 s8，note8 等设备上，
            // 导航栏显示存在bug："当用户隐藏导航栏时显示输入法的时候导航栏会跟随显示"，会导致隐藏输入法之后判断错误
            // 这个问题在 OneUI 2 & android 10 版本已修复

            int visibility = decorView.getSystemUiVisibility();
            isVisible = (visibility & View.SYSTEM_UI_FLAG_HIDE_NAVIGATION) == 0;
        }

        return isVisible;
    }

    private static String getResNameById(int id) {
        try {
            return ZSApplication.getAppContext().getResources().getResourceEntryName(id);
        } catch (Exception ignore) {
            return "";
        }
    }