如何检查 API 30 或更高版本上的 Inte.net 连接？

Question

我想使用网络功能检查 Inte.net 连接，但它给了我这个错误：

Must be one of: NetworkCapabilities.NET_CAPABILITY_MMS, NetworkCapabilities.NET_CAPABILITY_SUPL, NetworkCapabilities.NET_CAPABILITY_DUN, NetworkCapabilities.NET_CAPABILITY_FOTA, NetworkCapabilities.NET_CAPABILITY_IMS, NetworkCapabilities.NET_CAPABILITY_CBS, NetworkCapabilities.NET_CAPABILITY_WIFI_P2P, NetworkCapabilities.NET_CAPABILITY_IA, NetworkCapabilities.NET_CAPABILITY_RCS, NetworkCapabilities.NET_CAPABILITY_XCAP, NetworkCapabilities.NET_CAPABILITY_EIMS, NetworkCapabilities .NET_CAPABILITY_NOT_METERED, NetworkCapabilities.NET_CAPABILITY_INTE.NET, NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED, NetworkCapabilities.NET_CAPABILITY_TRUSTED, NetworkCapabilities.NET_CAPABILITY_NOT_VPN, NetworkCapabilities.NET_CAPABILITY_VALIDATED, NetworkCapabilities.NET_CAPABILITY_CAPTIVE_PORTAL, NetworkCapabilities.NET_CAPABILITY_NOT_ROAMING, NetworkCapabilities.NET_CAPABILITY_FOREGROUND, NetworkCapabilities.NET_CAPABILITY_NOT_CONGESTED, NetworkCapabilities.NET_CAPABILITY_NOT_SUSPENDED, NetworkCapab ... [截断]

我的代码：

fun checkInternetConnection(context : Context) : Boolean{
    val connectivityManager = context.getSystemService(
        Context.CONNECTIVITY_SERVICE) as ConnectivityManager

    val network = connectivityManager.activeNetwork?: return false
    val activeNetwork = connectivityManager.getNetworkCapabilities(network)?: return false

    return when{
        activeNetwork.hasCapability(NetworkCapabilities.TRANSPORT_WIFI) -> true
        activeNetwork.hasCapability(NetworkCapabilities.TRANSPORT_CELLULAR) -> true
        activeNetwork.hasCapability(NetworkCapabilities.TRANSPORT_ETHERNET) -> true
        else -> false
    }
}

}

我尝试使用 Android Studio 的自动更正来修复它，但它没有编写我想要的控制代码，而是用不同的代码更改了它。

Answer 1

我用它来检查设备是否确实有连接

fun isConnected(context: Context):Boolean{
        val cManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        val nCapabilities = cManager.getNetworkCapabilities(cManager.activeNetwork)
        return nCapabilities != null
    }

它对我有用，你可以试试。

Answer 2

在清单中

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

在代码中

public boolean isInternetAvailable() {
try {
    InetAddress ipAddr = InetAddress.getByName("google.com"); 
    //You can replace it with your name
        return !ipAddr.equals("");

    } catch (Exception e) {
        return false;
    }
}

//返回 boolean 值 if.network available

    private boolean isNetworkConnected() {
    ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

    return cm.getActiveNetworkInfo() != null && cm.getActiveNetworkInfo().isConnected();
}