简单说下，获取SDcard里的图片或者视屏缩略图就不说了，网上很多，主要写下加载图片的方式，在Grideview的Adapter中getView（）方法中定义：

//异步加载图片，实现一张张显示

new LoadImageAsyctask(gridViewHold.icon).execute(paths[position]);

class LoadImageAsyctask extends AsyncTask<String, Void, Bitmap>{

ImageView view;

public LoadImageAsyctask(ImageView view) {

super();

this.view = view;

}

@Override

protected Bitmap doInBackground(String... params) {

// TODO Auto-generated method stub

Bitmap videoIcon = ThumbnailUtils.createVideoThumbnail(

params[0], Video.Thumbnails.MINI_KIND);

return videoIcon;

}

@Override

protectedvoid onPreExecute() {

// TODO Auto-generated method stub

super.onPreExecute();

}

@Override

protectedvoid onPostExecute(Bitmap result) {

// TODO Auto-generated method stub

this.view.setImageBitmap(result);

super.onPostExecute(result);

}

}