What is a Sticky Broadcast

Question

I came across this term in the android documentation with the accompanying definition     These are broadcasts whose data is held by the system after being finished  so that clients can quickly retrieve that data without having to wait for the next broadcast     What does it mean  Can someone elaborate its use with a particular example  I believe we have to request a permission for using this intent  Why so    lt uses-permission android name  android permission BROADCAST STICKY   gt  - Allows an application to broadcast sticky intents

User · Answer

A normal broadcast Intent is not available anymore after is was send and processed by the system. If you use the sendStickyBroadcast(Intent) method, the Intent is sticky, meaning the Intent you are sending stays around after the broadcast is complete.

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User · Answer

The value of a sticky broadcast is the value that was last broadcast and is currently held in the sticky cache   This is not the value of a broadcast that was received right now   I suppose you can say it is like a browser cookie that you can access at any time   The sticky broadcast is now deprecated  per the docs for sticky broadcast methods  e g        This method was deprecated in API level 21  Sticky broadcasts should   not be used  They provide no security  anyone can access them   no   protection  anyone can modify them   and many other problems  The   recommended pattern is to use a non-sticky broadcast to report that   something has changed  with another mechanism for apps to retrieve the   current value whenever desired

User · Answer

If an Activity calls onPause with a normal broadcast  receiving the Broadcast can be missed  A sticky broadcast can be checked after it was initiated in onResume  Update 6 23 2020 Sticky broadcasts are deprecated  See sendStickyBroadcast documentation   This method was deprecated in API level 21    Sticky broadcasts should not be used  They provide no security  anyone can access them   no protection  anyone can modify them   and many other problems  The recommended pattern is to use a non-sticky broadcast to report that something has changed  with another mechanism for apps to retrieve the current value whenever desired   Implement Intent intent   new Intent  quot some custom action quot    intent putExtra  quot some boolean quot   true   sendStickyBroadcast intent    Resources  Related post  What is the difference between sendStickyBroadcast and sendBroadcast in Android   See removeStickyBroadcast Intent   and on API Level 5     isInitialStickyBroadcast   for usage in the Receiver s onReceive

User · Answer

sendStickyBroadcast   performs a sendBroadcast Intent  known as sticky  i e  the Intent you are sending stays around after the broadcast is complete  so that others can quickly retrieve that data through the return value of registerReceiver BroadcastReceiver  IntentFilter   In all other ways  this behaves the same as sendBroadcast Intent   One example of a sticky broadcast sent via the operating system is ACTION BATTERY CHANGED  When you call registerReceiver   for that action -- even with a null BroadcastReceiver -- you get the Intent that was last broadcast for that action  Hence  you can use this to find the state of the battery without necessarily registering for all future state changes in the battery

[android] What is a Sticky Broadcast?

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