There are many factors that need to be taken into consideration when developing an Android application. Developing an interface to handle queries on the server-side is one of the most important steps. Server-side state management is responsible for handling many different tasks, such as user authentication, serving content such as images or data and communication with a centralized database.
Amazon S3 is an aspect of Amazon Web Services that can help with server-side app management by providing object storage features to handle these queries. It has a number of libraries, databases, and cloud computing features that will assist you.