Android开发，JS调后台java代码，创建videoView，页面没反应，请问这是为什么？

Question

Android开发，前台WebView中的JS调后台java代码，代码中实例化videoView，start方法也执行了，requestFocus方法也执行了，多线程也实现了，程序执行无错误，但页面没有跳转，请问这可能是什么问题？Android开发JSvideoView

Answer 1

@Override
public void onCommonCreate(Bundle savedInstanceState) {

requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

setContentView(R.layout.business_layout_dzdd_spcx_vedio);
//setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);// 竖屏
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);//横屏

VideoView videoView = (VideoView)findViewById(R.id.videoView1);  
//String e = "http://vipimage.sunday-mobi.com/2013/4/b3ed9fde-eedf-4c71-8dbd-e97acc5237f5.flv";
        //String path = "http://vipimage.sunday-mobi.com/2013/4/2945920e-48ac-46ae-afb6-f0c1adae2b2f.mp4";
        videoView.setVideoPath(vedioUrl);  //vedioUrl是视频地址
        videoView.setMediaController(new MediaController(this));  

}这样你试试看  全屏播放         页面也贴给你
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/CommonLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
 
 <LinearLayout
        android:id="@+id/Layout_B"
          android:layout_width="wrap_content" 
         android:layout_height="wrap_content"  
         android:orientation="horizontal"
         android:layout_gravity="center"
         > 
        
      <VideoView 
              android:layout_height="match_parent" 
              android:id="@+id/videoView1"  
               android:layout_width="match_parent">
          </VideoView>  
        
     </LinearLayout>
</LinearLayout>很简单的

Answer 2

这是我的代码，请帮忙看看是啥问题。前台：
function showVideo()
 {
    return window.sv.play();
}
后台：
private Handler handler=null;protected void onCreate(Bundle savedInstanceState) {
    ​handler = new Handler();
    webview.addJavascriptInterface(new ShowVideo(), "sv");
}
class ShowVideo{
public void play(){
try{
Thread t = new Thread() {
public void run() {
handler.post(runnableUi);
}
};
t.start();
}catch(Exception e){
System.out.println(e.getMessage());
}
}
}
//构建Runnable对象
Runnable runnableUi=new  Runnable(){  
@Override  
public void run() {
videoView = (VideoView) findViewById(R.id.VideoView1);
videoView.setVideoURI(Uri.parse("file:///sdcard/MyFirstAppMovie/aaa.mp4"));        
videoView.setMediaController(new MediaController(MainActivity.this));  
videoView.start();
videoView.requestFocus();
}  
};