String[] columns = {MediaStore.Images.Media._ID, MediaStore.Images.Thumbnails.DATA, MediaStore.Images.Media.DATA, MediaStore.Images.Media.BUCKET_ID,
MediaStore.Images.Media.BUCKET_DISPLAY_NAME, "COUNT(1) AS count"};
String selection = "0==0) GROUP BY (" + MediaStore.Images.Media.BUCKET_ID;
String sortOrder = MediaStore.Images.Media.DATE_MODIFIED;
Cursor cursor = contentResolver.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, selection, null, sortOrder);

String[] columns = new String[]{MediaStore.Images.Media._ID, MediaStore.Images.Media.DATA};
/*查询文件路径包含上面指定的文件夹路径的图片--这样才能保证查询到的文件属于当前文件夹下*/
String whereclause = MediaStore.Images.ImageColumns.DATA + " like'" + folderPath + "/%'";
Log.i("queryGalleryPicture", "galleryPath:" + folderPath);
Cursor corsor = c.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, whereclause, null, null);

if (mSelectlist.contains(imageBean)) { //点击的item为已选过的图片时，删除
mSelectlist.remove(imageBean);
subSelectPosition();
} else { //不在选择列表里，添加
if (mSelectlist.size() >= maxCount) {
Toast.makeText(mContext, mContext.getResources().getString(R.string.publish_select_photo_max, maxCount), Toast.LENGTH_SHORT).show();
return;
}
mSelectlist.add(imageBean);
imageBean.selectPosition = mSelectlist.size();
}
//通知点击项发生了改变
notifyItemChanged(position);

/**
* 通知图片选择已改变
*/
public void updateImageSelectChanged () {
setChanged();
notifyObservers(imgSelectObj);
}

/*单选，参数对应的是context, 回调*/
FolderListActivity.startSelectSingleImgActivity(this, 2);
多选时：
/*参数对应context, 回调code, 传入的图片List, 可选的最大张数*/
FolderListActivity.startFolderListActivity(this, 1, null, 9);

List<ImageFolderBean> list = (List<ImageFolderBean>) data.getSerializableExtra("list");