Android :: Display Images From Particular Folder In SD Card

I want to write code to display the images only from a particular folder in sd card. e.g a folder named b'day(/sdcard/pictures/b'day). I have the following code, but it displays all the images in the sd card. What should I add/change in the following code to accomplish my objective.

private void displayGallery() { Uri uri = MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI;
String[] projection = { MediaStore.Images.ImageColumns._ID,
// The columns we want
MediaStore.Images.Thumbnails.IMAGE_ID, MediaStore.Images.Thumbnails.KIND };
String selection = MediaStore.Images.Thumbnails.KIND + "=" + // Select only mini's MediaStore.Images.Thumbnails.MINI_KIND;
mCursor = this.managedQuery(uri, projection, selection, null, null);
if (mCursor != null) { mCursor.moveToFirst();
ImageAdapter adapter = new ImageAdapter (mCursor, this);
Log.i(TAG, "displayGallery(), adapter = " + adapter.getCount());
mGallery.setAdapter(adapter); mGallery.setOnItemClickListener(this);
} }