1 ackage com.demo;  2    3 import java.util.ArrayList;  4    5 import android.app.Activity;  6 import android.content.Context;  7 import android.database.Cursor;  8 import android.graphics.Bitmap;  9 import android.graphics.BitmapFactory; 10 import android.os.Bundle; 11 import android.provider.MediaStore; 12 import android.provider.MediaStore.Images; 13 import android.view.LayoutInflater; 14 import android.view.View; 15 import android.view.ViewGroup; 16 import android.widget.BaseAdapter; 17 import android.widget.ImageView; 18 import android.widget.ListView; 19 import android.widget.TextView; 20   21 public class PictureActivity extends Activity{  22     private ListView picturefiles = null; 23     private Cursor cursor; 24     private ArrayList<PictureInfo> pictureList = new ArrayList<PictureActivity.PictureInfo>(); 25       26     private static final String[] STORE_IMAGES = { 27         MediaStore.Images.Media.DATA, 28         MediaStore.Images.Media.MIME_TYPE, 29         MediaStore.Images.Media.DISPLAY_NAME, 30         MediaStore.Images.Media._ID 31     }; 32       33     /** Called when the activity is first created. */ 34     @Override 35     public void onCreate(Bundle savedInstanceState) { 36         super.onCreate(savedInstanceState); 37         setContentView(R.layout.picture); 38         showimage(); 39         // 单击显示图片 40         //picturefiles.setOnItemClickListener(new ShowItemImageOnClickListener()); 41     } 42       43     public void showimage(){ 44         picturefiles = (ListView)findViewById(R.id.picture_list); 45         cursor = this.managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, STORE_IMAGES, null, null, null); 46         while(cursor.moveToNext()){ 47             PictureInfo info = new PictureInfo(); 48               49             info.filePath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA)); 50             info.mimeType = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.MIME_TYPE)); 51             info.title = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DISPLAY_NAME)); 52               53             //获取当前Picture对应的Id，然后根据该ID获取其Thumb 54             int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Images.Media._ID)); 55             /*if(info.bitmap!=null&&!info.bitmap.isRecycled()) 56             { 57                 info.bitmap.recycle(); 58             }*/ 59             BitmapFactory.Options options=new BitmapFactory.Options(); 60             options.inDither=false; 61             options.inPreferredConfig=Bitmap.Config.RGB_565; 62             info.bitmap=MediaStore.Images.Thumbnails.getThumbnail(getContentResolver(), id,  Images.Thumbnails.MICRO_KIND, options);  63             //然后将其加入到pictureList 64             pictureList.add(info); 65         } 66         System.out.println(pictureList.size()); 67         //然后需要设置ListView的Adapter了，使用我们自定义的Adatper 68         PictureAdapter adapter = new PictureAdapter(this); 69         picturefiles=(ListView)findViewById(R.id.picture_list); 70         picturefiles.setAdapter(adapter); 71     } 72       73     class PictureInfo{ 74         String filePath; 75         String mimeType; 76         Bitmap bitmap; 77         String title; 78     } 79       80     class ViewHolder{ 81         ImageView thumbImage; 82         TextView titleText; 83     } 84       85     /** 86      * 定义一个Adapter来显示缩略图和视频title信息 87      * @author Administrator 88      * 89      */ 90     private class PictureAdapter extends BaseAdapter{ 91           92         private Context mContext; 93         private LayoutInflater inflater; 94           95         public PictureAdapter(Context context){ 96             this.mContext = context; 97             this.inflater = LayoutInflater.from(context);  98             this.inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);   99         }100         @Override101         public int getCount() {102             // TODO Auto-generated method stub103             return pictureList.size();104         }105         @Override106         public Object getItem(int p) {107             // TODO Auto-generated method stub108             return pictureList.get(p);109         }110         @Override111         public long getItemId(int p) {112             // TODO Auto-generated method stub113             return p;114         }115         @Override116         public View getView(int position, View convertView, ViewGroup parent) {117             ViewHolder holder ;118             if(convertView == null){119                 holder = new ViewHolder();120                 convertView = inflater.inflate(R.layout.line, null);121                 holder.thumbImage = (ImageView)convertView.findViewById(R.id.icon);122                 holder.titleText = (TextView)convertView.findViewById(R.id.file_name);123                 convertView.setTag(holder);124             }else{125                 holder = (ViewHolder)convertView.getTag();126             }127              128             //显示信息129             holder.titleText.setText(pictureList.get(position).title);130             if(pictureList.get(position).bitmap != null){131                 holder.thumbImage.setImageBitmap(pictureList.get(position).bitmap);132             }133             return convertView;134         }       135     }136 }