android - 连接 VPN 时缺少 ConnectivityManager

Question

我有一个返回设备连接状态的功能，它一直工作正常，除非设备连接到 VPN，当网络不可用时它会给出误报

    fun isConnected(): Boolean {
        var result = false
        val connectivityManager =
            context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            val networkCapabilities = connectivityManager.activeNetwork ?: return false
            val actNw =
                connectivityManager.getNetworkCapabilities(networkCapabilities) ?: return false
            result = when {
                actNw.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) -> true
                actNw.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) -> true
                actNw.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET) -> true
                actNw.hasTransport(NetworkCapabilities.TRANSPORT_VPN) -> true

                else -> false
            }
        } else {
            connectivityManager.run {
                connectivityManager.activeNetworkInfo?.run {
                    result = when (type) {
                        ConnectivityManager.TYPE_WIFI -> true
                        ConnectivityManager.TYPE_MOBILE -> true
                        ConnectivityManager.TYPE_ETHERNET -> true
                        ConnectivityManager.TYPE_VPN -> true
                        else -> false
                    }

                }
            }
        }
        return result
    }

Answer 1

如果你想确认你的网络有internet，你不能只测试connectivityManager.activeNetwork和 actNw.hasTransport .connectivityManager.activeNetwork将返回 VPN，因为它是 Activity 网络，无论它是否有互联网。 actNw.hasTransport只是让您知道连接的传输。如果您不关心传输，您可能可以完全删除该代码。
你应该检查的是NET_CAPABILITY_INTERNET和 NET_CAPABILITY_VALIDATED .
NET_CAPABILITY_INTERNET

Indicates that this network should be able to reach the internet.

NET_CAPABILITY_VALIDATED

Indicates that connectivity on this network was successfullyvalidated. For example, for a network with NET_CAPABILITY_INTERNET, itmeans that Internet connectivity was successfully detected.

因此，您真正需要的是检查 Activity 网络是否具有这两种功能，以确定您是否连接到具有互联网连接的网络。

actNw.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET);
actNw.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED);