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

问题描述

在Flutter中，我想听听websocket断开事件，如何实现？
当应用程序进入后台时，websocket连接将被丢弃，我仍然没有找到一种方法可以让它在后台继续运行（有人有解决方案吗？），所以我必须检测是否一个websocket连接丢失或什么的，这样当连接断开时我可以重新连接。
请帮忙，如果有人知道如何实现。

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。参见下面的示例：

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');
        },
      );

希望有帮助。

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