Flutter websocket 断开监听 [英] Flutter websocket disconnect listening

问题描述

在 Flutter 中，我想监听 websocket 断开连接事件，如何实现?当应用程序进入后台时，websocket 连接将被删除，我仍然没有找到让它在后台继续运行的方法(有人有解决方案吗?)，所以我必须检测 websocket 连接是否是丢失什么的，这样我就可以在失去连接时重新连接.如果有人知道如何实现这一点，请帮忙.

In Flutter, I wanna listen to websocket disconnect event, how to achieve that? The websocket connect will be drop when app goes to background, I still not found a method to let it continuesly running in background (does anyone have solution?), So I have to detect if a websocket connect is lost or something, so that I can re-connect when lost connection. Pls help if anyone knows how to achieve that.

推荐答案

您可以通过实现 onDone 回调来查看 websocket 是否关闭.请看下面的例子:

You can find out if websocket is closed by implementing onDone callback. See the example below:

      _channel = IOWebSocketChannel.connect(
        'ws://yourserver.com:port',
      );

      ///
      /// Start listening to new notifications / messages
      ///
      _channel.stream.listen(
        (dynamic message) {
          debugPrint('message $message');
        },
        onDone: () {
          debugPrint('ws channel closed');
        },
        onError: (error) {
          debugPrint('ws error $error');
        },
      );

希望有所帮助.

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