Android App Widget Design Guidelines

A widget displays an application's most important or timely information at a glance, on a user's Home screen. These design guidelines describe how to design widgets that fit with others on the Home screen. They include links to graphics files and templates that will make your designer's life easier.


Check the following Google link for Android application widget design guidelines.
http://developer.android.com/guide/practices/ui_guidelines/widget_design.html