如何在WebView中以编程方式退出全屏？

// 检测是否进入全屏模式的标志
private boolean isFullscreen = false;
// 保存全屏模式前的屏幕状态
private int savedOrientation;
private int savedSystemUiVisibility;

// 进入全屏模式时调用
public void enterFullscreen() {
    // 保存当前屏幕状态
    savedOrientation = getActivity().getRequestedOrientation();
    savedSystemUiVisibility = getActivity().getWindow().getDecorView().getSystemUiVisibility();

    // 设置屏幕方向为横屏
    getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

    // 隐藏状态栏和导航栏
    getActivity().getWindow().getDecorView().setSystemUiVisibility(
            View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);

    isFullscreen = true;
}

// 退出全屏模式时调用
public void exitFullscreen() {
    // 恢复之前保存的屏幕状态
    getActivity().setRequestedOrientation(savedOrientation);
    getActivity().getWindow().getDecorView().setSystemUiVisibility(savedSystemUiVisibility);

    isFullscreen = false;
}

// 创建自定义的WebChromeClient
private WebChromeClient customWebChromeClient = new WebChromeClient() {
    @Override
    public void onShowCustomView(View view, CustomViewCallback callback) {
        super.onShowCustomView(view, callback);
        // 进入全屏模式
        enterFullscreen();
    }

    @Override
    public void onHideCustomView() {
        super.onHideCustomView();
        // 退出全屏模式
        exitFullscreen();
    }
};

// 设置WebView的WebChromeClient
webView.setWebChromeClient(customWebChromeClient);