Android 视频（从URL中提取）不'；尝试将它们放置在带有阵列适配器的列表视图中时，不显示

我试图制作一个列表视图，显示来自URL的视频，但我得到的只是一个空白屏幕

下面是VideoPlayerActivity.java

package com.example.nikhilbuduma.giflistview;

import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.MediaController;
import android.widget.Toast;
import android.widget.VideoView;
import java.util.ArrayList;

public class VideoPlayerActivity extends Activity {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_video_player);
        final ListView listview = (ListView) findViewById(R.id.listview);

        String[] urls = new String[] {"http://download.wavetlan.com/SVV/Media/HTTP/H264/Talkinghead_Media/H264_test1_Talkinghead_mp4_480x360.mp4"};

        final StableArrayAdapter adapter = new StableArrayAdapter(this, urls);
        listview.setAdapter(adapter);
    }

    private class StableArrayAdapter extends ArrayAdapter<String> {

        private final Context context;
        private final String[] values;

        public StableArrayAdapter(Context context, String[] values){
            super(context, R.layout.movie_cell, values);
            this.context = context;
            this.values = values;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent){
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View rowView = inflater.inflate(R.layout.movie_cell, parent, false);
            final VideoView videoView =(VideoView)rowView.findViewById(R.id.videoView);
            videoView.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                public void onCompletion(MediaPlayer mp) {
                    videoView.start(); //need to make transition seamless.
                }
            });
            videoView.setVideoURI(Uri.parse(values[position]));
            videoView.requestFocus();
            videoView.start();
            return rowView;
        }

    }
}

---

使用

ImageView

获取视频的缩略图，而不是

VideoView

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ...
    Bitmap thumbnail = ThumbnailUtils.createVideoThumbnail(values[position], 
            MediaStore.Video.Thumbnails.MICRO_KIND);
    imageView.setImageBitmap(thumbnail);
    ...
}

---

这似乎不起作用，缩略图没有显示出来。我认为我写的代码有更深层次的问题？

<?xml version="1.0" encoding="utf-8"?>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/listview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" />

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">

    <VideoView android:id="@+id/videoView"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"/>

</RelativeLayout>

01-07 20:45:50.741    2367-2367/com.example.nikhilbuduma.giflistview I/art﹕ Not late-enabling -Xcheck:jni (already on)
01-07 20:45:50.855    2367-2382/com.example.nikhilbuduma.giflistview D/OpenGLRenderer﹕ Render dirty regions requested: true
01-07 20:45:50.857    2367-2367/com.example.nikhilbuduma.giflistview D/﹕ HostConnection::get() New Host Connection established 0xae0f3d30, tid 2367
01-07 20:45:50.865    2367-2367/com.example.nikhilbuduma.giflistview D/Atlas﹕ Validating map...
01-07 20:45:50.929    2367-2382/com.example.nikhilbuduma.giflistview D/﹕ HostConnection::get() New Host Connection established 0xa6c4a040, tid 2382
01-07 20:45:50.946    2367-2382/com.example.nikhilbuduma.giflistview I/OpenGLRenderer﹕ Initialized EGL, version 1.4
01-07 20:45:50.972    2367-2382/com.example.nikhilbuduma.giflistview D/OpenGLRenderer﹕ Enabling debug mode 0
01-07 20:45:51.028    2367-2382/com.example.nikhilbuduma.giflistview W/EGL_emulation﹕ eglSurfaceAttrib not implemented
01-07 20:45:51.028    2367-2382/com.example.nikhilbuduma.giflistview W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xae0e88e0, error=EGL_SUCCESS
01-07 20:45:51.623    2367-2382/com.example.nikhilbuduma.giflistview W/EGL_emulation﹕ eglSurfaceAttrib not implemented
01-07 20:45:51.623    2367-2382/com.example.nikhilbuduma.giflistview W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xae0e88e0, error=EGL_SUCCESS

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ...
    Bitmap thumbnail = ThumbnailUtils.createVideoThumbnail(values[position], 
            MediaStore.Video.Thumbnails.MICRO_KIND);
    imageView.setImageBitmap(thumbnail);
    ...
}