android get folders that contain pictures

            
In fact, I desired effect:
First, the code used in the calendar sd file
Second, if the file has a picture, I save the current file name and folder, and the file in the first picture do thumbnails.
Third, the list shows all contain pictures folder names
Third, when you click the Item, display folder contains a collection of pictures. (Here we must correspond, click the file name, the display contains pictures inside it)

Consult the experts, how to achieve, how to save the folder name in the traversal time. And the first picture.

Thank you!
For example, sd have a folder one and two. There are pictures folder one two, one1 and one2
-Sd
+ One
one01.jpg
one02.jpg
+ Two
two01.jpg
two01.jpg
The question is, how to save files one name, rather than compiled calendar time, save two files one.
Reply:
"Rather than programmed calendar time, save two files one."
General recursive call would not have ah
Reply:
This problem is solved in it I encountered the same problem with the landlord about the possibility of providing the source of it?
Reply:
Give it rhamiss@163.com source
Reply:
Hello, how do you implement this feature, you can provide about the source, is learning ..... beg ah ....