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：

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01.package demo.camera;
02.import java.util.ArrayList;
03.import java.util.List;
04.import android.app.ListActivity;
05.import android.content.Context;
06.import android.database.Cursor;
07.import android.net.Uri;
08.import android.os.Bundle;
09.import android.provider.MediaStore;
10.import android.view.LayoutInflater;
11.import android.view.View;
12.import android.view.ViewGroup;
13.import android.widget.BaseAdapter;
14.import android.widget.ImageView;
15.import android.widget.TextView;
16./**
17. * 本实例，我们将通过检索SDCard上的Video信息
18. * 在MediaStore中，MediaStore.Video.Media中就有Video相关信息，
19. * 同时MediaStore.Video.Thumbnails中含有各个video对应的缩略图信息
20. *
21. * @author Administrator
22. *
23. */
24.public class AdvancedVideoDemo extends ListActivity {
25.
26.    private Cursor cursor;
27.
28.    public void onCreate(Bundle savedInstanceState){
29.        super.onCreate(savedInstanceState);
30.        setContentView(R.layout.video_advanced);
31.
32.        init();
33.    }
34.
35.
36.    private void init(){
37.        String[] thumbColumns = new String[]{
38.                MediaStore.Video.Thumbnails.DATA,
39.                MediaStore.Video.Thumbnails.VIDEO_ID
40.        };
41.
42.        String[] mediaColumns = new String[]{
43.                MediaStore.Video.Media.DATA,
44.                MediaStore.Video.Media._ID,
45.                MediaStore.Video.Media.TITLE,
46.                MediaStore.Video.Media.MIME_TYPE
47.        };
48.
49.        //首先检索SDcard上所有的video
50.        cursor = this.managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, mediaColumns, null, null, null);
51.
52.        ArrayList<VideoInfo> videoList = new ArrayList<AdvancedVideoDemo.VideoInfo>();
53.
54.        if(cursor.moveToFirst()){
55.            do{
56.                VideoInfo info = new VideoInfo();
57.
58.                info.filePath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA));
59.                info.mimeType = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.MIME_TYPE));
60.                info.title = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.TITLE));
61.
62.                //获取当前Video对应的Id，然后根据该ID获取其Thumb
63.                int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media._ID));
64.                String selection = MediaStore.Video.Thumbnails.VIDEO_ID +"=?";
65.                String[] selectionArgs = new String[]{
66.                        id+""
67.                };
68.                Cursor thumbCursor = this.managedQuery(MediaStore.Video.Thumbnails.EXTERNAL_CONTENT_URI, thumbColumns, selection, selectionArgs, null);
69.
70.                if(thumbCursor.moveToFirst()){
71.                    info.thumbPath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Thumbnails.DATA));
72.
73.                }
74.
75.                //然后将其加入到videoList
76.                videoList.add(info);
77.
78.            }while(cursor.moveToNext());
79.        }
80.
81.        //然后需要设置ListView的Adapter了，使用我们自定义的Adatper
82.        VideoAdapter adapter = new VideoAdapter(this, videoList);
83.        this.getListView().setAdapter(adapter);
84.    }
85.
86.    static class VideoInfo{
87.        String filePath;
88.        String mimeType;
89.        String thumbPath;
90.        String title;
91.    }
92.
93.    /**
94.     * 定义一个Adapter来显示缩略图和视频title信息
95.     * @author Administrator
96.     *
97.     */
98.    static class VideoAdapter extends BaseAdapter{
99.
100.        private Context context;
101.        private List<VideoInfo> videoItems;
102.
103.        public VideoAdapter(Context context, List<VideoInfo> data){
104.            this.context = context;
105.            this.videoItems = data;
106.        }
107.        @Override
108.        public int getCount() {
109.            // TODO Auto-generated method stub
110.            return videoItems.size();
111.        }
112.        @Override
113.        public Object getItem(int p) {
114.            // TODO Auto-generated method stub
115.            return videoItems.get(p);
116.        }
117.        @Override
118.        public long getItemId(int p) {
119.            // TODO Auto-generated method stub
120.            return p;
121.        }
122.        @Override
123.        public View getView(int position, View convertView, ViewGroup parent) {
124.            ViewHolder holder = null;
125.            if(convertView == null){
126.                holder = new ViewHolder();
127.                convertView = LayoutInflater.from(context).inflate(R.layout.video_item, null);
128.                holder.thumbImage = (ImageView)convertView.findViewById(R.id.thumb_image);
129.                holder.titleText = (TextView)convertView.findViewById(R.id.video_title);
130.                convertView.setTag(holder);
131.            }else{
132.                holder = (ViewHolder)convertView.getTag();
133.            }
134.
135.            //显示信息
136.            holder.titleText.setText(videoItems.get(position).title);
137.            if(videoItems.get(position).thumbPath != null){
138.                holder.thumbImage.setImageURI(Uri.parse(videoItems.get(position).thumbPath));
139.            }
140.
141.            return convertView;
142.        }
143.
144.        class ViewHolder{
145.            ImageView thumbImage;
146.            TextView titleText;
147.        }
148.
149.    }
150.}

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