The simple Android UI must be

For Android applications, the Android navigation system must be aware of all the different entry points for entry into the program and know how to handle communication with other applications in the right way.

The back key is the core navigation control, and generally does not change the use principle of the back key.

Careful design of the navigation mechanism is very important, 1. Follow the guidelines of the Platform

2. Make the application behave consistently, and using a consistent navigation control will make it easier for users to understand how to achieve their goals.

App Widgets (widgets that appear on your phone screen)

1. Achieve situational awareness, display the user's current location, time zone and other related information. A way to reduce the amount of information used in widgets.

2. Always show the latest data

The simple Android UI must be