最近关于webview的问题遇到的比较多，关于如何在webview中全屏播放视频，网上有很多种解决方法，这里也有一种方法，试了几种后发现还是这种比较好用。

这里就拿出来与大家分享，出自http://stackoverflow.com/questions/15768837/playing-html5-video-on-fullscreen-in-android-webview#userconsent#

代码里面已经有很好的注释了，我就不画蛇添足了。

VideoEnabledWebChromeClient class

import android.media.MediaPlayer;import android.media.MediaPlayer.OnCompletionListener;import android.media.MediaPlayer.OnErrorListener;import android.media.MediaPlayer.OnPreparedListener;import android.view.SurfaceView;import android.view.View;import android.view.ViewGroup;import android.view.ViewGroup.LayoutParams;import android.webkit.WebChromeClient;import android.widget.FrameLayout;/** * This class serves as a WebChromeClient to be set to a WebView, allowing it to play video. * Video will play differently depending on target API level (in-line, fullscreen, or both). * * It has been tested with the following video classes: * - android.widget.VideoView (typically API level <11) * - android.webkit.HTML5VideoFullScreen$VideoSurfaceView/VideoTextureView (typically API level 11-18) * - com.android.org.chromium.content.browser.ContentVideoView$VideoSurfaceView (typically API level 19+) *  * Important notes: * - For API level 11+, android:hardwareAccelerated="true" must be set in the application manifest. * - The invoking activity must call VideoEnabledWebChromeClient's onBackPressed() inside of its own onBackPressed(). * - Tested in Android API levels 8-19. Only tested on http://m.youtube.com. * * @author Cristian Perez (http://cpr.name) * */public class VideoEnabledWebChromeClient extends WebChromeClient implements OnPreparedListener, OnCompletionListener, OnErrorListener{    public interface ToggledFullscreenCallback    {        public void toggledFullscreen(boolean fullscreen);    }    private View activityNonVideoView;    private ViewGroup activityVideoView;    private View loadingView;    private VideoEnabledWebView webView;    private boolean isVideoFullscreen; // Indicates if the video is being displayed using a custom view (typically full-screen)    private FrameLayout videoViewContainer;    private CustomViewCallback videoViewCallback;    private ToggledFullscreenCallback toggledFullscreenCallback;    /**     * Never use this constructor alone.     * This constructor allows this class to be defined as an inline inner class in which the user can override methods     */    @SuppressWarnings("unused")    public VideoEnabledWebChromeClient()    {    }    /**     * Builds a video enabled WebChromeClient.     * @param activityNonVideoView A View in the activity's layout that contains every other view that should be hidden when the video goes full-screen.     * @param activityVideoView A ViewGroup in the activity's layout that will display the video. Typically you would like this to fill the whole layout.     */    @SuppressWarnings("unused")    public VideoEnabledWebChromeClient(View activityNonVideoView, ViewGroup activityVideoView)    {        this.activityNonVideoView = activityNonVideoView;        this.activityVideoView = activityVideoView;        this.loadingView = null;        this.webView = null;        this.isVideoFullscreen = false;    }    /**     * Builds a video enabled WebChromeClient.     * @param activityNonVideoView A View in the activity's layout that contains every other view that should be hidden when the video goes full-screen.     * @param activityVideoView A ViewGroup in the activity's layout that will display the video. Typically you would like this to fill the whole layout.     * @param loadingView A View to be shown while the video is loading (typically only used in API level <11). Must be already inflated and without a parent view.     */    @SuppressWarnings("unused")    public VideoEnabledWebChromeClient(View activityNonVideoView, ViewGroup activityVideoView, View loadingView)    {        this.activityNonVideoView = activityNonVideoView;        this.activityVideoView = activityVideoView;        this.loadingView = loadingView;        this.webView = null;        this.isVideoFullscreen = false;    }    /**     * Builds a video enabled WebChromeClient.     * @param activityNonVideoView A View in the activity's layout that contains every other view that should be hidden when the video goes full-screen.     * @param activityVideoView A ViewGroup in the activity's layout that will display the video. Typically you would like this to fill the whole layout.     * @param loadingView A View to be shown while the video is loading (typically only used in API level <11). Must be already inflated and without a parent view.     * @param webView The owner VideoEnabledWebView. Passing it will enable the VideoEnabledWebChromeClient to detect the HTML5 video ended event and exit full-screen.     * Note: The web page must only contain one video tag in order for the HTML5 video ended event to work. This could be improved if needed (see Javascript code).     */    public VideoEnabledWebChromeClient(View activityNonVideoView, ViewGroup activityVideoView, View loadingView, VideoEnabledWebView webView)    {        this.activityNonVideoView = activityNonVideoView;        this.activityVideoView = activityVideoView;        this.loadingView = loadingView;        this.webView = webView;        this.isVideoFullscreen = false;    }    /**     * Indicates if the video is being displayed using a custom view (typically full-screen)     * @return true it the video is being displayed using a custom view (typically full-screen)     */    public boolean isVideoFullscreen()    {        return isVideoFullscreen;    }    /**     * Set a callback that will be fired when the video starts or finishes displaying using a custom view (typically full-screen)     * @param callback A VideoEnabledWebChromeClient.ToggledFullscreenCallback callback     */    public void setOnToggledFullscreen(ToggledFullscreenCallback callback)    {        this.toggledFullscreenCallback = callback;    }    @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 LayoutParams(LayoutParams.MATCH_PARENT, 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);            }        }    }    @Override    public View getVideoLoadingProgressView() // Video will start loading    {        if (loadingView != null)        {            loadingView.setVisibility(View.VISIBLE);            return loadingView;        }        else        {            return super.getVideoLoadingProgressView();        }    }    @Override    public void onPrepared(MediaPlayer mp) // Video will start playing, only called in the case of android.widget.VideoView (typically API level <11)    {        if (loadingView != null)        {            loadingView.setVisibility(View.GONE);        }    }    @Override    public void onCompletion(MediaPlayer mp) // Video finished playing, only called in the case of android.widget.VideoView (typically API level <11)    {        onHideCustomView();    }    @Override    public boolean onError(MediaPlayer mp, int what, int extra) // Error while playing video, only called in the case of android.widget.VideoView (typically API level <11)    {        return false; // By returning false, onCompletion() will be called    }    /**     * Notifies the class that the back key has been pressed by the user.     * This must be called from the Activity's onBackPressed(), and if it returns false, the activity itself should handle it. Otherwise don't do anything.     * @return Returns true if the event was handled, and false if was not (video view is not visible)     */    public boolean onBackPressed()    {        if (isVideoFullscreen)        {            onHideCustomView();            return true;        }        else        {            return false;        }    }}

　　

VideoEnabledWebView  class

import android.annotation.SuppressLint;import android.content.Context;import android.os.Handler;import android.os.Looper;import android.util.AttributeSet;import android.webkit.WebChromeClient;import android.webkit.WebView;import java.util.Map;/** * This class serves as a WebView to be used in conjunction with a VideoEnabledWebChromeClient. * It makes possible: * - To detect the HTML5 video ended event so that the VideoEnabledWebChromeClient can exit full-screen. *  * Important notes: * - Javascript is enabled by default and must not be disabled with getSettings().setJavaScriptEnabled(false). * - setWebChromeClient() must be called before any loadData(), loadDataWithBaseURL() or loadUrl() method. * * @author Cristian Perez (http://cpr.name) * */public class VideoEnabledWebView extends WebView{    public class JavascriptInterface    {        @android.webkit.JavascriptInterface        public void notifyVideoEnd() // Must match Javascript interface method of VideoEnabledWebChromeClient        {            // This code is not executed in the UI thread, so we must force that to happen            new Handler(Looper.getMainLooper()).post(new Runnable()            {                @Override                public void run()                {                    if (videoEnabledWebChromeClient != null)                    {                        videoEnabledWebChromeClient.onHideCustomView();                    }                }            });        }    }    private VideoEnabledWebChromeClient videoEnabledWebChromeClient;    private boolean addedJavascriptInterface;    public VideoEnabledWebView(Context context)    {        super(context);        addedJavascriptInterface = false;    }    @SuppressWarnings("unused")    public VideoEnabledWebView(Context context, AttributeSet attrs)    {        super(context, attrs);        addedJavascriptInterface = false;    }    @SuppressWarnings("unused")    public VideoEnabledWebView(Context context, AttributeSet attrs, int defStyle)    {        super(context, attrs, defStyle);        addedJavascriptInterface = false;    }    /**     * Indicates if the video is being displayed using a custom view (typically full-screen)     * @return true it the video is being displayed using a custom view (typically full-screen)     */    public boolean isVideoFullscreen()    {        return videoEnabledWebChromeClient != null && videoEnabledWebChromeClient.isVideoFullscreen();    }    /**     * Pass only a VideoEnabledWebChromeClient instance.     */    @Override @SuppressLint("SetJavaScriptEnabled")    public void setWebChromeClient(WebChromeClient client)    {        getSettings().setJavaScriptEnabled(true);        if (client instanceof VideoEnabledWebChromeClient)        {            this.videoEnabledWebChromeClient = (VideoEnabledWebChromeClient) client;        }        super.setWebChromeClient(client);    }    @Override    public void loadData(String data, String mimeType, String encoding)    {        addJavascriptInterface();        super.loadData(data, mimeType, encoding);    }    @Override    public void loadDataWithBaseURL(String baseUrl, String data, String mimeType, String encoding, String historyUrl)    {        addJavascriptInterface();        super.loadDataWithBaseURL(baseUrl, data, mimeType, encoding, historyUrl);    }    @Override    public void loadUrl(String url)    {        addJavascriptInterface();        super.loadUrl(url);    }    @Override    public void loadUrl(String url, Map
     
       additionalHttpHeaders)    {        addJavascriptInterface();        super.loadUrl(url, additionalHttpHeaders);    }    private void addJavascriptInterface()    {        if (!addedJavascriptInterface)        {            // Add javascript interface to be called when the video ends (must be done before page load)            addJavascriptInterface(new JavascriptInterface(), "_VideoEnabledWebView"); // Must match Javascript interface name of VideoEnabledWebChromeClient            addedJavascriptInterface = true;        }    }}
     

//再Activity的 oncreate方法中初始化 VideoEabledWebView 和 VideoEnabledWebChromeClient

private VideoEnabledWebView webView;private VideoEnabledWebChromeClient webChromeClient;@Overrideprotected void onCreate(Bundle savedInstanceState){    super.onCreate(savedInstanceState);    // Set layout    setContentView(R.layout.activity_main);    // Save the web view    webView = (VideoEnabledWebView) findViewById(R.id.webView);    // Initialize the VideoEnabledWebChromeClient and set event handlers    View nonVideoLayout = findViewById(R.id.nonVideoLayout); // Your own view, read class comments    ViewGroup videoLayout = (ViewGroup) findViewById(R.id.videoLayout); // Your own view, read class comments    View loadingView = getLayoutInflater().inflate(R.layout.view_loading_video, null); // Your own view, read class comments    webChromeClient = new VideoEnabledWebChromeClient(nonVideoLayout, videoLayout, loadingView, webView) // See all available constructors...    {        // Subscribe to standard events, such as onProgressChanged()...        @Override        public void onProgressChanged(WebView view, int progress)        {            // Your code...        }    };    webChromeClient.setOnToggledFullscreen(new VideoEnabledWebChromeClient.ToggledFullscreenCallback()    {        @Override        public void toggledFullscreen(boolean fullscreen)        {            // Your code to handle the full-screen change, for example showing and hiding the title bar. Example:            if (fullscreen)            {                WindowManager.LayoutParams attrs = getWindow().getAttributes();                attrs.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;                attrs.flags |= WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;                getWindow().setAttributes(attrs);                if (android.os.Build.VERSION.SDK_INT >= 14)                {                    getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE);                }            }            else            {                WindowManager.LayoutParams attrs = getWindow().getAttributes();                attrs.flags &= ~WindowManager.LayoutParams.FLAG_FULLSCREEN;                attrs.flags &= ~WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;                getWindow().setAttributes(attrs);                if (android.os.Build.VERSION.SDK_INT >= 14)                {                    getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);                }            }        }    });    webView.setWebChromeClient(webChromeClient);    // Navigate everywhere you want, this classes have only been tested on YouTube's mobile site    webView.loadUrl("http://m.youtube.com");}

//重写回退方法，让页面可以回退 @Overridepublic void onBackPressed(){    // Notify the VideoEnabledWebChromeClient, and handle it ourselves if it doesn't handle it    if (!webChromeClient.onBackPressed())    {        if (webView.canGoBack())        {            webView.goBack();        }        else        {            // Close app (presumably)            super.onBackPressed();        }    }}