Full-screen-option ist nicht verfügbar, wenn das laden von YouTube-video in WebView

Die folgenden änderungen in der java-Datei:

view.setWebViewClient(new Browser());
view.setWebChromeClient(new MyWebClient());

und fügen Sie diese 2-Klasse, die ist Klasse Browser und Klasse MyWebClient in der java-Datei

class Browser
        extends WebViewClient
{
    Browser() {}

    public boolean shouldOverrideUrlLoading(WebView paramWebView, String paramString)
    {
        paramWebView.loadUrl(paramString);
        return true;
    }
}

public class MyWebClient
        extends WebChromeClient
{
    private View mCustomView;
    private WebChromeClient.CustomViewCallback mCustomViewCallback;
    protected FrameLayout mFullscreenContainer;
    private int mOriginalOrientation;
    private int mOriginalSystemUiVisibility;

    public MyWebClient() {}

    public Bitmap getDefaultVideoPoster()
    {
        if (MainActivity.this == null) {
            return null;
        }
        return BitmapFactory.decodeResource(MainActivity.this.getApplicationContext().getResources(), 2130837573);
    }

    public void onHideCustomView()
    {
        ((FrameLayout)MainActivity.this.getWindow().getDecorView()).removeView(this.mCustomView);
        this.mCustomView = null;
        MainActivity.this.getWindow().getDecorView().setSystemUiVisibility(this.mOriginalSystemUiVisibility);
        MainActivity.this.setRequestedOrientation(this.mOriginalOrientation);
        this.mCustomViewCallback.onCustomViewHidden();
        this.mCustomViewCallback = null;
    }

    public void onShowCustomView(View paramView, WebChromeClient.CustomViewCallback paramCustomViewCallback)
    {
        if (this.mCustomView != null)
        {
            onHideCustomView();
            return;
        }
        this.mCustomView = paramView;
        this.mOriginalSystemUiVisibility = MainActivity.this.getWindow().getDecorView().getSystemUiVisibility();
        this.mOriginalOrientation = MainActivity.this.getRequestedOrientation();
        this.mCustomViewCallback = paramCustomViewCallback;
        ((FrameLayout)MainActivity.this.getWindow().getDecorView()).addView(this.mCustomView, new FrameLayout.LayoutParams(-1, -1));
        MainActivity.this.getWindow().getDecorView().setSystemUiVisibility(3846);
    }
}