Version: Unity 6.1 Alpha (6000.1)
Language : English
Android mobile scripting
Android application size restrictions

Input for Android devices

Mobile devices are the primary target for Android applications. For more information on mobile device input, refer to Mobile device input.

Android keyboard

Android devices include a touchscreen keyboard. When you select editable UI(User Interface) Allows a user to interact with your application. Unity currently supports three UI systems. More info
See in Glossary
elements such as Input Fields Unity automatically activates the Android touchscreen keyboard and handles input from it. For information on how to manually activate and configure the Android touchscreen keyboard, refer to Mobile Keyboard.

Additional resources

Android mobile scripting
Android application size restrictions