用过WebView的开发者们肯定都知道这里面的坑数不胜数，加载缓慢，内存泄露，文件选择…… 最近在项目中遇到了对接小鱼易联直播的情况，因为小鱼本身提供了直播功能，采用的是网页方式，所以在手机端直接进行对接网页，然后在进行全屏播放视频，又遇到了一个大坑。一个没有修饰过的原生WebView几乎不可能在某一个主流视频网站实现全屏播放，倘若在客户端自己实现简单的播放器，链接拿过来，摆个VideoView，想怎么全屏怎么全屏，放在WebView上，一切就悲剧了，大多数情况下点击“全屏按钮”是没有反应的，或者无法实现横屏全屏。今天来介绍一种简单易行粗暴的方式来实现WebView的视频全屏播放。
当你无从下手的时候，照例先看一下官方文档，很多常见的问题官方文档都给我们提供思路。你会发现下面这样一段话，发现官方已经提供了实现全屏展示html content的方式。
应用如果需要支持HTML5的video标签，必须打开硬件加速。我们只需要在Application标签或者相应Activity标签下添加android:hardwareAccelerated=”true”即可。接着为了支持全屏，需要重写WebChromeClient的onShowCustomView()和onHideCustomView()方法，这两个方法缺一不可。先来看一下onShowCustomView（）:
当前页面进入全屏模式的时候会调用这个方法，并且返回了两个参数。第一个是我们要在全屏模式时显示的View，第二个是一个CustomViewCallBack接口，可以调用这个接口请求关闭全屏模式。再看一下onHideCustomView()方法：
通知应用当前页面已经关闭全屏模式，我们需要做的操作是隐藏之前onSHowCustomView()方法中取到的View。了解这两个方法之后，我们就可以进行一些操作来实现简单的全屏播放了。
下面我们以实际例子说明如何实现。
布局文件中我们增加一个和WebView同层级的Framelayout，
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27<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<!-- View that will be hidden when video goes fullscreen -->
<RelativeLayout
android:id="@+id/nonVideoLayout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.daren.app.html.fullscreen_webview.VideoEnabledWebView
android:id="@+id/webView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
<!-- View where the video will be shown when video goes fullscreen -->
<RelativeLayout
android:id="@+id/videoLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</RelativeLayout>
</RelativeLayout>自定义WebChromeClient
关键代码如下：1
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104@Override
public void onShowCustomView(View view, CustomViewCallback callback)
{
if (view instanceof FrameLayout)
{
// A video wants to be shown
FrameLayout frameLayout = (FrameLayout) view;
View focusedChild = frameLayout.getFocusedChild();
// Save video related variables
this.isVideoFullscreen = true;
this.videoViewContainer = frameLayout;
this.videoViewCallback = callback;
// Hide the non-video view, add the video view, and show it
activityNonVideoView.setVisibility(View.INVISIBLE);
activityVideoView.addView(videoViewContainer, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
activityVideoView.setVisibility(View.VISIBLE);
if (focusedChild instanceof android.widget.VideoView)
{
// android.widget.VideoView (typically API level <11)
android.widget.VideoView videoView = (android.widget.VideoView) focusedChild;
// Handle all the required events
videoView.setOnPreparedListener(this);
videoView.setOnCompletionListener(this);
videoView.setOnErrorListener(this);
}
else
{
// Other classes, including:
// - android.webkit.HTML5VideoFullScreen$VideoSurfaceView, which inherits from android.view.SurfaceView (typically API level 11-18)
// - android.webkit.HTML5VideoFullScreen$VideoTextureView, which inherits from android.view.TextureView (typically API level 11-18)
// - com.android.org.chromium.content.browser.ContentVideoView$VideoSurfaceView, which inherits from android.view.SurfaceView (typically API level 19+)
// Handle HTML5 video ended event only if the class is a SurfaceView
// Test case: TextureView of Sony Xperia T API level 16 doesn't work fullscreen when loading the javascript below
if (webView != null && webView.getSettings().getJavaScriptEnabled() && focusedChild instanceof SurfaceView)
{
// Run javascript code that detects the video end and notifies the Javascript interface
String js = "javascript:";
js += "var _ytrp_html5_video_last;";
js += "var _ytrp_html5_video = document.getElementsByTagName('video')[0];";
js += "if (_ytrp_html5_video != undefined && _ytrp_html5_video != _ytrp_html5_video_last) {";
{
js += "_ytrp_html5_video_last = _ytrp_html5_video;";
js += "function _ytrp_html5_video_ended() {";
{
js += "_VideoEnabledWebView.notifyVideoEnd();"; // Must match Javascript interface name and method of VideoEnableWebView
}
js += "}";
js += "_ytrp_html5_video.addEventListener('ended', _ytrp_html5_video_ended);";
}
js += "}";
webView.loadUrl(js);
}
}
// Notify full-screen change
if (toggledFullscreenCallback != null)
{
toggledFullscreenCallback.toggledFullscreen(true);
}
}
}
@Override @SuppressWarnings("deprecation")
public void onShowCustomView(View view, int requestedOrientation, CustomViewCallback callback) // Available in API level 14+, deprecated in API level 18+
{
onShowCustomView(view, callback);
}
@Override
public void onHideCustomView()
{
// This method should be manually called on video end in all cases because it's not always called automatically.
// This method must be manually called on back key press (from this class' onBackPressed() method).
if (isVideoFullscreen)
{
// Hide the video view, remove it, and show the non-video view
activityVideoView.setVisibility(View.INVISIBLE);
activityVideoView.removeView(videoViewContainer);
activityNonVideoView.setVisibility(View.VISIBLE);
// Call back (only in API level <19, because in API level 19+ with chromium webview it crashes)
if (videoViewCallback != null && !videoViewCallback.getClass().getName().contains(".chromium."))
{
videoViewCallback.onCustomViewHidden();
}
// Reset video related variables
isVideoFullscreen = false;
videoViewContainer = null;
videoViewCallback = null;
// Notify full-screen change
if (toggledFullscreenCallback != null)
{
toggledFullscreenCallback.toggledFullscreen(false);
}
}
}最后别忘记处理屏幕旋转，否则横竖屏切换会重新走一遍生命周期.
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5<activity
android:name=".html.ZbtWebViewActivity"
android:theme="@style/Theme.AppCompat.NoActionBar"
android:configChanges="orientation">
</activity>隐藏网页中的广告
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7@Override
public void onPageFinished(WebView view, String url) {
String js = "javascript:function hideAd(){document.getElementsByClassName('mobile__live--title')[0].style.display='none'}";
webView.loadUrl(js);
webView.loadUrl("javascript:hideAd();"); //调用js方法，隐藏广告
super.onPageFinished(view, url);
}
代码地址：可全屏的webview
参考链接：