There are 4 example of Android Widgets based on this article : https://medium.com/@erenutku/android-widgets-ad3d166458d3

SimpleWidgetExample

Widget Creation Steps with a basic example(Opening a website on widget clicked)

BroadcastWidgetExample

Broadcast Widget Example(Counting clicks on widget)

ConfigurableWidgetExample

Configurable Widget Example(Getting data before creation and using the data when it’s clicked)

UpdatingWidgetExample

Updated by a Service Widget Example (Updating every minute brings random numbers on widget)