Flutter报错：Bad state: Stream has already been listened to.

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2022-03-11

出现场景

取消订阅Stream，重新订阅时出现

解决方案

查询文档发现，单订阅的Stream只能被订阅一次，就算取消订阅了也不能重新订阅。
有2种方法

  1. 使用广播方式创建StreamController。
  2. 使用RxDart中的BehaviorSubject来代替StreamController。

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