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