如何从Firebase实时数据库中删除侦听器 [英] How to remove listener from Firebase Realtime Database

问题描述

要从Firebase实时数据库接收数据，我需要注册侦听器:

For receiving data from Firebase Realtime Database I need to register listener:

objectReference.addValueEventListener(valueEventListener);

删除(取消注册)此侦听器的正确方法是什么?

What is correct way to remove (unregister) this listener?

推荐答案

删除监听器的正确方法是使用以下代码行将其相应地删除到活动的生命周期中:

The correct way to remove a listener is to remove it accordingly to the life-cycle of your activity using this line of code:

databaseReference.removeEventListener(valueEventListener);

请注意，如果已在onStart中添加了侦听器，则必须在onStop中将其删除.如果已在onResume中添加了侦听器，则必须在onPause中将其删除.如果已在onCreate中添加了侦听器，则必须在onDestroy中将其删除.

Note that, if you have added the listener in onStart you have to remove it in onStop. If you have added the listener in onResume you have to remove it in onPause. If you have added the listener in onCreate you have to remove it in onDestroy.

但是请记住，并非总是调用onDestroy.

But remember onDestroy is not always called.

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