当我启动使用 VideoView 从 RTSP URL 播放视频的活动时，将显示空白屏幕

Question

我试图制作一个具有实时视频流的 android 应用程序，但每当相关活动（此活动）打开时，除了空白屏幕外，它不会显示任何内容。谁能帮我？

       package guc.edu.iremote;
import android.app.Activity;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.net.Uri;
import android.os.Bundle;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.MediaController;
import android.widget.VideoView;
public class Video extends Activity  implements OnTouchListener{
VideoView videoView;
int stopPosition;
boolean touched;
protected WakeLock mWakeLock;
Dialog dialog;

@SuppressWarnings("deprecation")
public void OnCreate(Bundle b) {
    super.onCreate(b);
    this.setContentView(R.layout.video);

    videoView = (VideoView) findViewById(R.id.videoView1);

    PowerManager lPwrMgr = (PowerManager) getSystemService(POWER_SERVICE);
    mWakeLock = lPwrMgr.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK,                 "Video");
    mWakeLock.acquire();

    videoView.setVisibility(View.VISIBLE);
    MediaController mc = new MediaController(this){
        @Override
        public void hide() {
            this.show(0);
        }
        @Override
        public void setMediaPlayer(MediaPlayerControl player) {
            super.setMediaPlayer(player);
            this.show();
        }
    };
    videoView.setMediaController(mc);
    mc.setAnchorView(videoView);
      dialog = ProgressDialog.show(Video.this, "", "Loading...",
            true);
    new Thread(new Runnable() {
        public void run() {
             String str = "rtsp://v4.cache2.c.youtube.com/"+
                    "CkELENy73wIaOAng93Xa-"+ 
                        "iQH5xMYESARFEIJbXYtZ29vZ2xlSARSBXdhdGNoWglDbGlja0xpbmtgg9fFkeTLublGDA==/"+ 
                    "0/0/0/video.3gp";  
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
            Uri uri = Uri.parse(str);
            videoView.setVideoURI(uri);
             videoView.setOnTouchListener(this);
            videoView.requestFocus();
            videoView.setZOrderOnTop(false);
            videoView.start();
            dialog.dismiss();
        }
    }).start();


}

@Override
protected void onResume() {
    // TODO Auto-generated method stub
    super.onResume();
    //videoView.seekTo(stopPosition);
    //videoView.resume();
}

protected void onPause() {
    super.onPause();
    if (videoView != null) {
        stopPosition = videoView.getCurrentPosition();
        videoView.pause();
    }
}

public boolean onTouch(View v, MotionEvent event) {
    // TODO Auto-generated method stub
    if(v==videoView)
    {
        System.out.println("touched"); 
        if(!touched)
        {
            onPause();
            touched = true;
        }
        else
            onResume();
            touched  = false;
    }
    return false;
}
@Override
protected void onDestroy() {
    // TODO Auto-generated method stub
    super.onDestroy();
    // release wake-lock 
    if(mWakeLock != null){
        mWakeLock.release();
    }
}
}

这是针对 XML 的

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
    <VideoView
        android:id="@+id/videoView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</FrameLayout> 

Answer 1

那个链接是什么：

rtsp://v4.cache2.c.youtube.com/CkELENy73wIaOAng93Xa-iQH5xMYESARFEIJbXYtZ29vZ2xlSARSBXdhdGNoWglDbGlja0xpbmtgg9fFkeTLublGDA==/0/0/0/video.3gp

？

它似乎不起作用。 如果链接损坏，应该修复该链接，然后尝试。但。。。要验证这是问题所在，您可以将其替换为指向另一个正常工作的视频文件的链接吗？（如果您需要一些，请告诉我，但谷歌可以提供大量:)

编辑

正如另一个人（之前的另一个答案）评论的那样，您还需要在主线程中访问您的 UI，而不是在后台线程中。 所以你应该像这样发布到 UI 线程：

Runnable r = new Runnable(){ /* the updating videoView stuff you wanted to do*/ };
ctx.runOnUIThread(r); 

其中ctx是对当前活动的引用。

Answer 2

另外：

videoView.setZOrderOnTop(false); <- wrong
videoView.setZOrderOnTop(true); <- right