I am working on an Android App and a few of my activities are listening to a Firestore-Database with the help of the function addSnapshotListener. When an activity that called the addSnapshotListener function gets finished (by calling finish() or pressing the back button): Is the listener removed automatically or do I have to call the remove() method myself?

And what happens when I start another activity? Is the SnapshotListner of the previous activity still active or is it paused?

CodePudding user response：

Firestore never automatically removes listeners and is not aware of your app's activity lifecycle. You have to remove them yourself.

The only time a listener is automatically removed is when your application's process is terminated - all of its code ceases to run at that point.

The exception to this is when passing an Activity argument to addSnapshotListener.