Android ConnectivityManager onAvailable 有时不返回

Question

我们使用 Android ConnectivityManager 来监听我们应用程序内部的互联网连接变化，如下所示。

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        ...
        ConnectionStateMonitor().enable(this)
    }

    class ConnectionStateMonitor : NetworkCallback() {
        private val networkRequest: NetworkRequest = NetworkRequest.Builder()
            .addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)
            .addTransportType(NetworkCapabilities.TRANSPORT_WIFI).build()

        fun enable(context: Context) {
            val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
            connectivityManager.registerNetworkCallback(networkRequest, this)
        }

        override fun onAvailable(network: Network) {
            Log.i(TAG, "onAvailable ")
        }

        override fun onLost(network: Network?) {
            super.onLost(network)
            Log.i(TAG, "onLost ")
        }
    }
}

除了我们遇到的两个问题外，此实现运行良好

1. 如果我们同时使用 wifi 和移动数据连接到互联网并关闭 wifi，有时会触发 onLost() 回调，然后触发 onAvailable() ，正如预期的那样，但在其他情况下，仅 onLost() 被触发，这是不正确的。

2. 如果我们没有互联网连接并打开应用程序，onLost() 不会被触发，但是如果我们有互联网连接并打开应用程序，onAvailable() 被解雇。

任何帮助、建议、解决方法或其他可靠检测互联网连接变化的方法都将不胜感激。

在小米 A2 (Android 9), OnePlus (Android 9) 上测试

演示项目
https://github.com/PhanVanLinh/AndroidNetworkChangeReceiver

Answer 1

我已经使用了您的项目并添加了另一个方法:onCapabilitiesChanged。我从启用飞行模式开始，然后关闭然后再次打开。这些是日志:

onAvailable 632

onCapabilitiesChanged 632 [ Transports: CELLULAR ...]

onAvailable 632

onCapabilitiesChanged 632 [ Transports: CELLULAR ...]

onAvailable 632

onCapabilitiesChanged 632 [ Transports: CELLULAR ...]

onCapabilitiesChanged 632 [ Transports: CELLULAR ...]

onCapabilitiesChanged 632 [ Transports: CELLULAR ...]

onAvailable 633

onCapabilitiesChanged 633 [ Transports: WIFI ...] onAvailable 633 onCapabilitiesChanged 633 [ Transports: WIFI ...]

onAvailable 633

onCapabilitiesChanged 633 [ Transports: WIFI ...]

onCapabilitiesChanged 633 [ Transports: WIFI ...]

onCapabilitiesChanged 633 [ Transports: WIFI ...]

onCapabilitiesChanged 633 [ Transports: WIFI ...]

onCapabilitiesChanged 633 [ Transports: WIFI ...]

onCapabilitiesChanged 633 [ Transports: WIFI ...]

onLost 632

onLost 632

onLost 632

onLost 633

onLost 633

onLost 633

onAvailable 634

onCapabilitiesChanged 634 [ Transports: CELLULAR ...]

onAvailable 634

onCapabilitiesChanged 634 [ Transports: CELLULAR ...]

onAvailable 634

onCapabilitiesChanged 634 [ Transports: CELLULAR ...]

onCapabilitiesChanged 634 [ Transports: CELLULAR ...]

onCapabilitiesChanged 634 [ Transports: CELLULAR ...]

onCapabilitiesChanged 634 [ Transports: CELLULAR ...]

onAvailable 635

onCapabilitiesChanged 635 [ Transports: WIFI ...]

onAvailable 635

onCapabilitiesChanged 635 [ Transports: WIFI ...]

onAvailable 635

onCapabilitiesChanged 635 [ Transports: WIFI ...]

onCapabilitiesChanged 635 [ Transports: WIFI ...]

onCapabilitiesChanged 635 [ Transports: WIFI ...]

onCapabilitiesChanged 635 [ Transports: WIFI ...]

onLost 634

onLost 634

onLost 634

onCapabilitiesChanged 635 [ Transports: WIFI ...]

onCapabilitiesChanged 635 [ Transports: WIFI ...]

如您所见，LOST 用于蜂窝传输，而 AVAILABLE 用于 WiFi

根据您的用例(启用 wifi、启用移动数据、禁用 wifi 数据、启用 wifi、禁用 wifi)这就是我得到的。

onAvailable 640

onCapabilitiesChanged 640 [ Transports: WIFI ... ]

onAvailable 640

onCapabilitiesChanged 640 [ Transports: WIFI ... ]

onCapabilitiesChanged 640 [ Transports: WIFI ... ]

onCapabilitiesChanged 640 [ Transports: WIFI ... ]

onCapabilitiesChanged 640 [ Transports: WIFI ... ]

onCapabilitiesChanged 640 [ Transports: WIFI ... ]

onLost 640

onLost 640

onAvailable 641

onCapabilitiesChanged 641 [ Transports: CELLULAR ... ]

onAvailable 641

onCapabilitiesChanged 641 [ Transports: CELLULAR ... ]

onCapabilitiesChanged 641 [ Transports: CELLULAR ... ]

onCapabilitiesChanged 641 [ Transports: CELLULAR ... ]

onAvailable 642

onCapabilitiesChanged 642 [ Transports: WIFI ... ]

onAvailable 642

onCapabilitiesChanged 642 [ Transports: WIFI ... ]

onCapabilitiesChanged 642 [ Transports: WIFI ... ]

onCapabilitiesChanged 642 [ Transports: WIFI ... ]

onCapabilitiesChanged 642 [ Transports: WIFI ... ]

onCapabilitiesChanged 642 [ Transports: WIFI ... ]

onLost 641

onLost 641

onLost 642

onLost 642

onAvailable 643

onCapabilitiesChanged 643 [ Transports: CELLULAR ... ]

onAvailable 643

onCapabilitiesChanged 643 [ Transports: CELLULAR ... ]

onCapabilitiesChanged 643 [ Transports: CELLULAR ... ]

onCapabilitiesChanged 643 [ Transports: CELLULAR ... ]