title: How to fullscreen youtube video in WebView
body: <p>I use following code:</p>
  
  <pre><code>@Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_test_web_view_play_youtube);
      WebView w = (WebView) findViewById(R.id.w);
      w.setWebChromeClient(new WebChromeClient());
      w.setWebViewClient(new WebViewClient());
      w.getSettings().setJavaScriptEnabled(true);
      w.loadUrl("https://www.youtube.com/watch?v=gY-HZg1Uwpc");
  }
  </code></pre>
  
  <p>i get following screenshot</p>
  
  <p><a href="https://i.stack.imgur.com/5z4Ab.png" rel="noreferrer"><img src="https://i.stack.imgur.com/5z4Ab.png" alt="enter image description here"></a></p>
  
  <p>In this screenshot, I could not see "fullScreen" button.</p>