I want to authorize user and then want to access user photo that are available on a cloud drive. Kindly guide me how to access user cloud drive in android application and get user photos.
Have you check out Amazon Cloud Drive API? You would use Login with Amazon for authorization, and then use the Cloud Drive's Nodes API to retrieve a list of photos.
Getting List of files.
GET : {{metadataUrl}}/drive/v1/nodes?filters=kind:FILE
filters: (Optional) filters for request, see filtering