Develop a mobile application for Photobank

We need to implement a mobile application for Photobank. The app aims to ensure that anyone in need can find photos that meet their needs and then buy them.
After purchase, the photo can be downloaded to the phone or send to any application (VIber, WhatsApp, Telegram, Instagram, GDrive, GMail, etc.).

First screen: Search bar (no authorization required).
Second screen: search result by line (no authorization required).
Third screen: photo details + button "Download" (does not require authorization).

After pressing the button, we show:

Screen four: Authorization.
Screen five: registration.
Screen six: my photos.

For Android-application will be provided with a ready frame with a menu and all the necessary items in this menu. A ready-made library will also be provided to work with the Photobank API. The library will provide a convenient and flexible interface for requesting data from the server, as well as the ability to specify your callback when receiving data. The library is written around Android Asynchronous Http Client.

Thus, all communication with the server will be abstracted from the programmer who will implement the Android application.

The EventBus library will be used as a tool for data transfer to the UI.

Support for Android version since version 4.4.+.

All graphical elements and UI controls must be executed in accordance with the official Guidelines:
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So, you don’t have to make your icons.

Mandatory requirements:
Getting acquainted with Google Material Design Guidelines
Knowledge and understanding of the EventBus
It will also be an Android Asynchronous Http Client experience.