android:gallery相册

 public class GalleryActivity extends Activity {

 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.gallery_layout);

  Gallery galler = (Gallery) findViewById(R.id.gallery1);
  galler.setAdapter(new ImageAdapter(this,getSD()));
 }

 private List<String> getSD() {
  
  List<String> it = new ArrayList<String>();
  File mFile=new File("/sdcard/");
  File[] mFiles = mFile.listFiles();
  
  for(int i = 0;i<mFiles.length;i++){
   File file=mFiles[i];
   if(getImageFile(file.getPath())) 
    it.add(file.getPath());
  }
  return it;
 }
 private boolean getImageFile(String path) {
  boolean re;

  String end = path.substring(path.lastIndexOf(".") + 1, path.length()).toLowerCase();

  if(end.equals("jpg")||end.equals("gif")||end.equals("png")||end.equals("jpeg")||end.equals("bmp")){
   re = true;
  }else{
   re = false;
  }
  return re;
 }
 public class ImageAdapter extends BaseAdapter{

  private Context mContext;
  private List<String> mList;
  int mGalleryItem;
  
  public ImageAdapter(Context cont, List<String> sd) {
   mContext = cont;
   mList = sd; 
  }

  public int getCount() {
   return mList.size();
  }
 
  public Object getItem(int position) {
   return position;
  }
 
  public long getItemId(int position) {
   return position;
  }

  public View getView(int position, View convertView, ViewGroup parent) {
   ImageView image = new ImageView(mContext); 
   Bitmap bitmap = BitmapFactory.decodeFile(mList.get(position).toString());
   image.setImageBitmap(bitmap);
   image.setScaleType(ImageView.ScaleType.FIT_XY);
   image.setLayoutParams(new Gallery.LayoutParams(
     LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
   image.setBackgroundResource(mGalleryItem);
   return image;
  }  
 }
}