播放器上的按钮不起作用WebView（全屏模式）Android

Question

将YouTube播放器插入WebView按钮不起作用（全屏模式）。当您按下按钮时，什么也不会发生。我该如何使用示例代码来做到这一点？

public class MainActivity extends AppCompatActivity {

    private WebView view;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        this.view = (WebView) findViewById(R.id.webView);
        view = findViewById(R.id.webView);
        WebSettings webSettings = view.getSettings();
        webSettings.setJavaScriptEnabled(true);
        view.getSettings().setJavaScriptEnabled(true);
        view.setWebViewClient(new WebViewClient());
        view.setWebChromeClient(new WebChromeClient(){} );
        view.loadUrl("https://www.youtube.com/");
    }
    //method to handle pressing the BACK button
    @Override
    public void onBackPressed() {
        if (view.canGoBack()) {
            view.goBack();
        } else {
            super.onBackPressed();
        }
    }
    // method disables reboot when screen is rotated
    @Override
    public void onConfigurationChanged(Configuration newConfig){
        super.onConfigurationChanged(newConfig);
    }
}