A Sticky Broadcast is a special type of broadcast in Android where the sent Intent object remains in a cache even after the broadcast is complete. The system may re-broadcast sticky Intents to later registrations of receivers[1][2].
Some key points about Sticky Broadcasts:
They allow communication between a function and a service[1]
They are sent using sendStickyBroadcast() which performs a sendBroadcast(Intent) known as sticky[1]
The Intent stays around after the broadcast is complete, so others can quickly retrieve that data through the return value of registerReceiver(BroadcastReceiver, IntentFilter)[1]
For example, you can use a sticky broadcast for ACTION_BATTERY_CHANGED to get battery change events without registering for all future state changes[1]
However, sticky broadcasts have some security issues[2]:
