App Creation
Thunkable - drag and drop app creation for android devices
App Inventor (Use Chrome, Safari or Firefox browser) Click continue without an account and then be sure to take note of 4 word code to enable saving.
http://www.appinventor.org/book2
Lightwell has been recommended to assist with app creation. It’s a platform that helps build apps and provides some free classroom resources to support the design process. The second idea is to check out Apple’s iBooks and related resources. Even though you may not use Swift, there are plenty of ideas for the design process.