Android中使用WebView实现全屏切换播放网页视频

首先写布局文件activity_main.xml：

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">
    <framelayout 
        android:id="@+id/video_view"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:visibility="gone"
        ></framelayout>
    <button 
        android:id="@+id/video_landport"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="全屏不显示该按扭，点击切换横屏"
        android:gravity="center"
        />
    <webview 
        android:id="@+id/video_webview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        />
    </linearlayout>

　　原理：实现全屏的时候把webview里的视频放到一个view（布局里的video_view控件）里面，然后把webview隐藏掉！这样就实现了全屏播放的！
现在具体来看看怎么实现的:
先放代码mainactivity.java：

public class mainactivity extends activity {
 
    private framelayout videoview;// 全屏时视频加载view
    private button videolandport;
    private webview videowebview;
    private boolean islandport = true;//true表示此时是竖屏，false表示此时横屏。
    private view xcustomview;
    private xwebchromeclient xwebchromeclient;
    private string url = "http://look.appjx.cn/mobile_api.php?mod=news&id=12604";
    private webchromeclient.customviewcallback     xcustomviewcallback;
 
    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        requestwindowfeature(window.feature_no_title);//去掉应用标题
        getwindow().setflags(windowmanager.layoutparams.flag_fullscreen,
                windowmanager.layoutparams.flag_fullscreen);
        setcontentview(r.layout.activity_main);
        initwidget();
        initlistener();
        videowebview.loadurl(url);
    }
 
    private void initlistener() {
        // todo auto-generated method stub
        videolandport.setonclicklistener(new listener());
    }
 
    private void initwidget() {
        // todo auto-generated method stub
        videoview = (framelayout) findviewbyid(r.id.video_view);
        videolandport = (button) findviewbyid(r.id.video_landport);
        videowebview = (webview) findviewbyid(r.id.video_webview);
        websettings ws = videowebview.getsettings();
        /**
         * setallowfileaccess 启用或禁止webview访问文件数据 setblocknetworkimage 是否显示网络图像
         * setbuiltinzoomcontrols 设置是否支持缩放 setcachemode 设置缓冲的模式
         * setdefaultfontsize 设置默认的字体大小 setdefaulttextencodingname 设置在解码时使用的默认编码
         * setfixedfontfamily 设置固定使用的字体 setjavasciptenabled 设置是否支持javascript
         * setlayoutalgorithm 设置布局方式 setlighttouchenabled 设置用鼠标激活被选项
         * setsupportzoom 设置是否支持变焦
         * */
        ws.setbuiltinzoomcontrols(true);// 隐藏缩放按钮
        ws.setlayoutalgorithm(websettings.layoutalgorithm.narrow_columns);// 排版适应屏幕
        ws.setusewideviewport(true);// 可任意比例缩放
        ws.setloadwithoverviewmode(true);// setusewideviewport方法设置webview推荐使用的窗口。setloadwithoverviewmode方法是设置webview加载的页面的模式。
        ws.setsavepassword(true);
        ws.setsaveformdata(true);// 保存表单数据
        ws.setjavascriptenabled(true);
        ws.setgeolocationenabled(true);// 启用地理定位
        ws.setgeolocationdatabasepath("/data/data/org.itri.html5webview/databases/");// 设置定位的数据库路径
        ws.setdomstorageenabled(true);
        xwebchromeclient = new xwebchromeclient();
        videowebview.setwebchromeclient(xwebchromeclient);
        videowebview.setwebviewclient(new xwebviewclientent());
    }
 
    class listener implements onclicklistener {
        @override
        public void onclick(view v) {
            // todo auto-generated method stub
            switch (v.getid()) {
            case r.id.video_landport:
                if (islandport) {
                    setrequestedorientation(activityinfo.screen_orientation_portrait);
                    videolandport.settext("全屏不显示该按扭，点击切换横屏");
                }else {
                    setrequestedorientation(activityinfo.screen_orientation_landscape); 
                    videolandport.settext("全屏不显示该按扭，点击切换竖屏");
                }
                break;
            default:
                break;
            }
        }
    }
       @override
        public boolean onkeydown(int keycode, keyevent event) {
            if (keycode == keyevent.keycode_back) {
                if (incustomview()) {
                    hidecustomview();
                    return true;
                }else {
                videowebview.loadurl("about:blank");
//                    mtestwebview.loaddata("", "text/html; charset=utf-8", null);
                mainactivity.this.finish();
                    log.i("testwebview", "===>>>2");
            }
            }
            return true;
        }
       /**
        * 判断是否是全屏
        * @return
        */
        public boolean incustomview() {
             return (xcustomview != null);
         }
         /**
          * 全屏时按返加键执行退出全屏方法
          */
         public void hidecustomview() {
             xwebchromeclient.onhidecustomview();
         }
    /**
     * 处理javascript的对话框、网站图标、网站标题以及网页加载进度等
     * @author
     */
    public class xwebchromeclient extends webchromeclient {
        private bitmap xdefaltvideo;
        private view xprogressvideo;
        @override
        //播放网络视频时全屏会被调用的方法
        public void onshowcustomview(view view, webchromeclient.customviewcallback callback)
        {
            if (islandport) {
            }
            else{
                 
//                ii = "1";
//                setrequestedorientation(activityinfo.screen_orientation_portrait); 
            }
            setrequestedorientation(activityinfo.screen_orientation_landscape); 
            videowebview.setvisibility(view.gone);
            //如果一个视图已经存在，那么立刻终止并新建一个
            if (xcustomview != null) {
                callback.oncustomviewhidden();
                return;
            }            
            videoview.addview(view);
            xcustomview = view;
            xcustomviewcallback = callback;
            videoview.setvisibility(view.visible);
        }
         
        @override
        //视频播放退出全屏会被调用的
        public void onhidecustomview() {
             
            if (xcustomview == null)//不是全屏播放状态
                return;                      
            // hide the custom view.
            setrequestedorientation(activityinfo.screen_orientation_portrait); 
            xcustomview.setvisibility(view.gone);
             
            // remove the custom view from its container.
            videoview.removeview(xcustomview);
            xcustomview = null;
            videoview.setvisibility(view.gone);
            xcustomviewcallback.oncustomviewhidden();
             
            videowebview.setvisibility(view.visible);
             
            //log.i(logtag, "set it to webvew");
        }
        //视频加载添加默认图标
        @override
        public bitmap getdefaultvideoposter() {
            //log.i(logtag, "here in on getdefaultvideoposter");   
            if (xdefaltvideo == null) {
                xdefaltvideo = bitmapfactory.decoderesource(
                        getresources(), r.drawable.videoicon);
            }
            return xdefaltvideo;
        }
        //视频加载时进程loading
        @override
        public view getvideoloadingprogressview() {
            //log.i(logtag, "here in on getvideoloadingpregressview");
             
            if (xprogressvideo == null) {
                layoutinflater inflater = layoutinflater.from(mainactivity.this);
                xprogressvideo = inflater.inflate(r.layout.video_loading_progress, null);
            }
            return xprogressvideo; 
        }
        //网页标题
         @override
         public void onreceivedtitle(webview view, string title) {
            (mainactivity.this).settitle(title);
         }
 
//         @override
//       //当webview进度改变时更新窗口进度
//         public void onprogresschanged(webview view, int newprogress) {
//             (mainactivity.this).getwindow().setfeatureint(window.feature_progress, newprogress*100);
//         }      
    }
    /**
     * 处理各种通知、请求等事件
     * @author
     */
    public class xwebviewclientent extends webviewclient {
         @override
            public boolean shouldoverrideurlloading(webview view, string url) {
                log.i("webviewtest", "shouldoverrideurlloading: "+url);
                return false;
            }
    }
    /**
     * 当横竖屏切换时会调用该方法
     * @author
     */
    @override
    public void onconfigurationchanged(configuration newconfig) {
        log.i("testwebview", "=====<<<  onconfigurationchanged  >>>=====");
         super.onconfigurationchanged(newconfig);
          
         if(newconfig.orientation == configuration.orientation_landscape){
             log.i("webview", "   现在是横屏1");
             islandport = false;
            }else if(newconfig.orientation == configuration.orientation_portrait){
             log.i("webview", "   现在是竖屏1");
             islandport = true;
            }
    }
}

　　最后说下androidmanifest.xml设置;
访问网络权限加上这句
<uses-permission android:name="android.permission.internet"/>
当切换横竖屏时为了不重新调用oncreate等方法，要加个这句：
android:configchanges="orientation|keyboardhidden|screensize"

完成

参考于:https://www.cnblogs.com/lee0oo0/p/4039654.html