Android 视频缩略图之 MediaStore

Android 视频缩略图之 MediaStore

首先 声明MediaStore是2.0以后才有的类

Android 视频缩略图之 MediaStore代码下载：

免费下载地址在 http://linux.bkjia.com/

用户名与密码都是www.bkjia.com

具体下载目录在 /pub/Android源码集锦/2011年/12月/Android 视频缩略图之 MediaStore/

listview.xml如下

1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:orientation="horizontal"  
4.     android:layout_width="fill_parent"  
5.     android:layout_height="fill_parent"  
6.     >  
7.     <ImageView  
8.         android:layout_width="wrap_content"  
9.         android:layout_height="wrap_content"  
10.         android:id="@+id/iv"  
11.         />  
12.     <TextView    
13.         android:layout_width="fill_parent"   
14.         android:layout_height="wrap_content"  
15.         android:id="@+id/tv"   
16.         />  
17. </LinearLayout>  

1、

1. package com.lp;  
2.   
3. import java.util.ArrayList;  
4.   
5. import android.app.ListActivity;  
6. import android.content.Context;  
7. import android.database.Cursor;  
8. import android.net.Uri;  
9. import android.os.Bundle;  
10. import android.provider.MediaStore;  
11. import android.view.LayoutInflater;  
12. import android.view.View;  
13. import android.view.ViewGroup;  
14. import android.widget.BaseAdapter;  
15. import android.widget.ImageView;  
16. import android.widget.TextView;  
17. /** 
18.  * 本实例，我们将通过检索SDCard上的Video信息 
19.  * 在MediaStore中，MediaStore.Video.Media中就有Video相关信息， 
20.  * 同时MediaStore.Video.Thumbnails中含有各个video对应的缩略图信息 
21.  *  
22.  * @author Administrator 
23.  * 
24.  */  
25. public class MainActivity extends ListActivity {  
26.       
27.     private Cursor cursor;  
28.     private ArrayList<VideoInfo> videoList = new ArrayList<MainActivity.VideoInfo>();  
29.     private ImageView img;  
30.       
31.     public void onCreate(Bundle savedInstanceState){  
32.         super.onCreate(savedInstanceState);  
33.         init();  
34.     }  
35.       
36.       
37.     private void init(){  
38.         String[] thumbColumns = new String[]{  
39.                 MediaStore.Video.Thumbnails.DATA,  
40.                 MediaStore.Video.Thumbnails.VIDEO_ID  
41.         };  
42.           
43.         String[] mediaColumns = new String[]{  
44.                 MediaStore.Video.Media.DATA,  
45.                 MediaStore.Video.Media._ID,  
46.                 MediaStore.Video.Media.TITLE,  
47.                 MediaStore.Video.Media.MIME_TYPE  
48.         };  
49.           
50.         //首先检索SDcard上所有的video   
51.         cursor = this.managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, mediaColumns, null, null, null);  
52.           
53.           
54.         while(cursor.moveToNext()){  
55.                 VideoInfo info = new VideoInfo();  
56.                   
57.                 info.filePath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA));  
58.                 info.mimeType = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.MIME_TYPE));  
59.                 info.title = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.TITLE));  
60.                   
61.                 //获取当前Video对应的Id，然后根据该ID获取其Thumb   
62.                 int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media._ID));  
63.                 String selection = MediaStore.Video.Thumbnails.VIDEO_ID +"=?";  
64.                 String[] selectionArgs = new String[]{  
65.                         id+""  
66.                 };  
67.                 Cursor thumbCursor = this.managedQuery(MediaStore.Video.Thumbnails.EXTERNAL_CONTENT_URI, thumbColumns, selection, selectionArgs, null);  
68.                   
69.                 if(thumbCursor.moveToFirst()){  
70.                     info.thumbPath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Thumbnails.DATA));  
71.                       
72.                 }  
73.                 //然后将其加入到videoList   
74.                 videoList.add(info);  
75.                   
76.         }  
77.         System.out.println(videoList.size());  
78.         //然后需要设置ListView的Adapter了，使用我们自定义的Adatper   
79.         VideoAdapter adapter = new VideoAdapter(this);  
80.         this.getListView().setAdapter(adapter);  
81.     }  
82.       
83.       
84.     class VideoInfo{  
85.         String filePath;  
86.         String mimeType;  
87.         String thumbPath;  
88.         String title;  
89.     }  
90.       
91.     class ViewHolder{  
92.         ImageView thumbImage;  
93.         TextView titleText;  
94.     }  
95.       
96.     /** 
97.      * 定义一个Adapter来显示缩略图和视频title信息 
98.      * @author Administrator 
99.      * 
100.      */  
101.     private class VideoAdapter extends BaseAdapter{  
102.           
103.         private Context mContext;  
104.         private LayoutInflater inflater;  
105.           
106.         public VideoAdapter(Context context){  
107.             this.mContext = context;  
108.             this.inflater = LayoutInflater.from(context);   
109.             this.inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);    
110.         }  
111.         @Override  
112.         public int getCount() {  
113.             // TODO Auto-generated method stub   
114.             return videoList.size();  
115.         }  
116.         @Override  
117.         public Object getItem(int p) {  
118.             // TODO Auto-generated method stub   
119.             return videoList.get(p);  
120.         }  
121.         @Override  
122.         public long getItemId(int p) {  
123.             // TODO Auto-generated method stub   
124.             return p;  
125.         }  
126.         @Override  
127.         public View getView(int position, View convertView, ViewGroup parent) {  
128.             ViewHolder holder ;  
129.             if(convertView == null){  
130.                 holder = new ViewHolder();  
131.                 convertView = inflater.inflate(R.layout.listview, null);  
132.                 holder.thumbImage = (ImageView)convertView.findViewById(R.id.iv);  
133.                 holder.titleText = (TextView)convertView.findViewById(R.id.tv);  
134.                 convertView.setTag(holder);  
135.             }else{  
136.                 holder = (ViewHolder)convertView.getTag();  
137.             }  
138.               
139.             //显示信息   
140.             holder.titleText.setText(videoList.get(position).title);  
141.             if(videoList.get(position).thumbPath != null){  
142.                 holder.thumbImage.setImageURI(Uri.parse(videoList.get(position).thumbPath));  
143.             }  
144.               
145.             return convertView;  
146.         }  
147.           
148.     }  
149. }