android app -- 2

I need an Android app. I would like it designed and built. I want to create an app. you will have to create 999 keys images which means on each image a number is embedded on key which is an image. so we have 999 images with each image consists of a key and one number on it. wherever this app is open and I say a number at a specific time then the key with that number must be visible in my phone gallery.