检索MediaStore中的Video和其对应的缩略图信息

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和Image，Audio一样，在Android中，Video信息也被MediaStore管理着。
和每个视频对应的有其一个缩略图，这个缩略图往往是其第一帧的图像。
下面看代码：
package demo.camera;import Java.util.ArrayList;import java.util.List;import android.app.ListActivity;import android.content.Context;import android.database.Cursor;import android.net.Uri;import android.os.Bundle;import android.provider.MediaStore;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;/** * 本实例，我们将通过检索SDCard上的Video信息 * 在MediaStore中，MediaStore.Video.Media中就有Video相关信息， * 同时MediaStore.Video.Thumbnails中含有各个video对应的缩略图信息 *  * @author Administrator * */public class AdvancedVideoDemo extends ListActivity {    private Cursor cursor;    public void onCreate(Bundle savedInstanceState){        super.onCreate(savedInstanceState);        setContentView(R.layout.video_advanced);        init();    }    private void init(){        String[] thumbColumns = new String[]{                MediaStore.Video.Thumbnails.DATA,                MediaStore.Video.Thumbnails.VIDEO_ID        };        String[] mediaColumns = new String[]{                MediaStore.Video.Media.DATA,                MediaStore.Video.Media._ID,                MediaStore.Video.Media.TITLE,                MediaStore.Video.Media.MIME_TYPE        };        //首先检索SDcard上所有的video        cursor = this.managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, mediaColumns, null, null, null);        ArrayList<VideoInfo> videoList = new ArrayList<AdvancedVideoDemo.VideoInfo>();        if(cursor.moveToFirst()){            do{                VideoInfo info = new VideoInfo();                info.filePath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA));                info.mimeType = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.MIME_TYPE));                info.title = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.TITLE));                //获取当前Video对应的Id，然后根据该ID获取其Thumb                int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media._ID));                String selection = MediaStore.Video.Thumbnails.VIDEO_ID +"=?";                String[] selectionArgs = new String[]{                        id+""                };                Cursor thumbCursor = this.managedQuery(MediaStore.Video.Thumbnails.EXTERNAL_CONTENT_URI, thumbColumns, selection, selectionArgs, null);                if(thumbCursor.moveToFirst()){                    info.thumbPath = thumbCursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Thumbnails.DATA));                }                //然后将其加入到videoList                videoList.add(info);            }while(cursor.moveToNext());        }        //然后需要设置ListView的Adapter了，使用我们自定义的Adatper        VideoAdapter adapter = new VideoAdapter(this, videoList);        this.getListView().setAdapter(adapter);    }    static class VideoInfo{        String filePath;        String mimeType;        String thumbPath;        String title;    }    /**     * 定义一个Adapter来显示缩略图和视频title信息     * @author Administrator     *     */    static class VideoAdapter extends BaseAdapter{        private Context context;        private List<VideoInfo> videoItems;        public VideoAdapter(Context context, List<VideoInfo> data){            this.context = context;            this.videoItems = data;        }        @Override        public int getCount() {            // TODO Auto-generated method stub            return videoItems.size();        }        @Override        public Object getItem(int p) {            // TODO Auto-generated method stub            return videoItems.get(p);        }        @Override        public long getItemId(int p) {            // TODO Auto-generated method stub            return p;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            ViewHolder holder = null;            if(convertView == null){                holder = new ViewHolder();                convertView = LayoutInflater.from(context).inflate(R.layout.video_item, null);                holder.thumbImage = (ImageView)convertView.findViewById(R.id.thumb_image);                holder.titleText = (TextView)convertView.findViewById(R.id.video_title);                convertView.setTag(holder);            }else{                holder = (ViewHolder)convertView.getTag();            }            //显示信息            holder.titleText.setText(videoItems.get(position).title);            if(videoItems.get(position).thumbPath != null){                holder.thumbImage.setImageURI(Uri.parse(videoItems.get(position).thumbPath));            }            return convertView;        }        class ViewHolder{            ImageView thumbImage;            TextView titleText;        }    }}
转自：http://blog.csdn.net/chenjie19891104/article/details/6338910
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