Android Webview加载www.youtube.com的问题

Android Webview加载www.youtube.com的问题
1.若在AndroidManifest.xml去掉android:hardwareAccelerated="true"即不启动硬件加速，会导致有声音但视频显示黑色。所以要开启硬件加速
WebView中也有对此的说明：
<h3>HTML5 Video support</h3>
*
* <p>In order to support inline HTML5 video in your application you need to have hardware
* acceleration turned on.
* </p>

2.若Webview中加载youtube视频不支持全屏功能是因为没有实现 WebChromeClient#onShowCustomView(View, WebChromeClient.CustomViewCallback)}
和 {@link WebChromeClient#onHideCustomView()}.

WebView中也有对此的说明：
<h3>Full screen support</h3>
*
* <p>In order to support full screen &mdash; for video or other HTML content &mdash; you need to set a
* {@link android.webkit.WebChromeClient} and implement both
* {@link WebChromeClient#onShowCustomView(View, WebChromeClient.CustomViewCallback)}
* and {@link WebChromeClient#onHideCustomView()}. If the implementation of either of these two methods is
* missing then the web contents will not be allowed to enter full screen. Optionally you can implement
* {@link WebChromeClient#getVideoLoadingProgressView()} to customize the View displayed whilst a video
* is loading.
* </p>