NetworkInfo 和 WifiConfiguration 已在 SDK 22 中弃用

Question

我在 PAX A920 设备（SDK 版本 22）中使用 android lollipop。我在构建时收到这样的警告消息：

NetworkInfo in android.net has been deprecated

WifiConfiguration in android.net has been deprecated

我很困惑，因为我在 C:\Users\{YOUR_ACCOUNT}\AppData\Local\Android\Sdk\sources\android-22\com\android\connectivitymanagertest 中看到了使用该方法访问 wifi 的 sdk 22 示例，但为什么它似乎已被弃用？

有什么方法可以替代已弃用的方法？

public boolean isWifiConnected() {
    boolean isWifiConnected = false;
    try {
        NetworkInfo networkInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        if (networkInfo != null) {
            isWifiConnected = networkInfo.getState() == CONNECTED;
        }
        Log.i(TAG, "wifi adapter is connected? " + isWifiConnected);
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return isWifiConnected;
}

public void removeNetwork() {
    List<WifiConfiguration> wifiCfgList = wifiManager.getConfiguredNetworks();
    if (wifiCfgList.size() > 0) {
        for (WifiConfiguration item : wifiCfgList) {
            if (item != null) {
                wifiManager.removeNetwork(item.networkId);
                wifiManager.saveConfiguration();
            }
        }
    }
}

感谢指出。

Answer 1

已弃用的 classes 已替换为 ConnectivityManager 系统服务和 NetworkCallbacks：https://developer.android.com/training/monitoring-device-state/connectivity-status-type

尽管官方代码示例显示了如何从 ConnectivityManager 获取 NetworkInfo，但有一个突出显示的注释：

这是一个示例代码，说明您如何获取当前网络状态并随着时间的推移接收更新。这是我将在生产中使用的部分精简的解决方案。如果您将它与 RxJava 或 RxKotlin 连接，您可以创建一个可观察对象来保存网络状态，并在调用 NetworkCallback 的重写方法时进行更新。

关于 Java 的注意事项：public class 级变量被设为 public 只是为了简洁。相反，我会为它们创建一些 getter 来访问这些变量背后的值。

欢迎提问。

Java

class NetworkReachabilityService {

    public NetworkType networkType;
    public NetworkState networkState = NetworkState.Unavailable;
    private ConnectivityManager connectivityManager;
    private ConnectivityManager.NetworkCallback networkCallback = new ConnectivityManager.NetworkCallback() {
        @Override
        public void onAvailable(@NonNull Network network) {
            super.onAvailable(network);
            updateAvailability(connectivityManager.getNetworkCapabilities(network));
        }

        @Override
        public void onLosing(@NonNull Network network, int maxMsToLive) {
            super.onLosing(network, maxMsToLive);
            networkState = NetworkState.Losing;
        }

        @Override
        public void onLost(@NonNull Network network) {
            super.onLost(network);
            networkState = NetworkState.Lost;
        }

        @Override
        public void onUnavailable() {
            super.onUnavailable();
            networkState = NetworkState.Unavailable;
        }

        @Override
        public void onCapabilitiesChanged(@NonNull Network network, @NonNull NetworkCapabilities networkCapabilities) {
            super.onCapabilitiesChanged(network, networkCapabilities);
            updateAvailability(networkCapabilities);
        }
    };

    public NetworkReachabilityService(Context context) {
        connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    }

    private void updateAvailability(NetworkCapabilities networkCapabilities) {
        if (networkCapabilities == null) {
            networkState = NetworkState.Unavailable;
            return;
        }

        if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
            networkType = NetworkType.CELL;
        } else if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
            networkType = NetworkType.WiFi;
        }

        networkState = NetworkState.Available;
    }

    public void resumeListeningNetworkChanges() {
        pauseListeningNetworkChanges();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            connectivityManager.registerDefaultNetworkCallback(networkCallback);
        } else {
            connectivityManager.registerNetworkCallback(
                    new NetworkRequest.Builder().build(),
                    networkCallback
            );
        }
    }

    public void pauseListeningNetworkChanges() {
        try {
            connectivityManager.unregisterNetworkCallback(networkCallback);
        } catch (IllegalArgumentException exception) {
            // Usually happens only once if: "NetworkCallback was not registered"
        }
    }

    private enum NetworkState {
        Available, Unavailable, Connecting, Losing, Lost
    }

    private enum NetworkType {
        WiFi, CELL, OTHER
    }
}

科特林

sealed class NetworkState {
    data class Available(val type: NetworkType) : NetworkState()
    object Unavailable : NetworkState()
    object Connecting : NetworkState()
    object Losing : NetworkState()
    object Lost : NetworkState()
}

sealed class NetworkType {
    object WiFi : NetworkType()
    object CELL : NetworkType()
    object OTHER : NetworkType()
}

class NetworkReachabilityService private constructor(context: Context) {
    
    private val connectivityManager: ConnectivityManager =
        context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    private val networkCallback = object : ConnectivityManager.NetworkCallback() {
        // There are more functions to override!

        override fun onLost(network: Network) {
            super.onLost(network)
            networkState = NetworkState.Lost
        }

        override fun onUnavailable() {
            super.onUnavailable()
            networkState = NetworkState.Unavailable
        }

        override fun onLosing(network: Network, maxMsToLive: Int) {
            super.onLosing(network, maxMsToLive)
            networkState = NetworkState.Losing
        }

        override fun onAvailable(network: Network) {
            super.onAvailable(network)
            updateAvailability(connectivityManager.getNetworkCapabilities(network))
        }

        override fun onCapabilitiesChanged(
            network: Network,
            networkCapabilities: NetworkCapabilities
        ) {
            super.onCapabilitiesChanged(network, networkCapabilities)
            updateAvailability(networkCapabilities)
        }
    }
    
    var networkState: NetworkState = NetworkState.Unavailable
        private set

    private fun updateAvailability(networkCapabilities: NetworkCapabilities?) {
        if (networkCapabilities == null) {
            networkState = NetworkState.Unavailable
            return
        }
        var networkType: NetworkType = NetworkType.OTHER

        if (networkCapabilities.hasTransport(TRANSPORT_CELLULAR)) {
            networkType = NetworkType.CELL
        }
        if (networkCapabilities.hasTransport(TRANSPORT_WIFI)) {
            networkType = NetworkType.WiFi
        }

        networkState = NetworkState.Available(networkType)
    }

    fun pauseListeningNetworkChanges() {
        try {
            connectivityManager.unregisterNetworkCallback(networkCallback)
        } catch (e: IllegalArgumentException) {
            // Usually happens only once if: "NetworkCallback was not registered"
        }
    }

    fun resumeListeningNetworkChanges() {
        pauseListeningNetworkChanges()
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            connectivityManager.registerDefaultNetworkCallback(networkCallback)
        } else {
            connectivityManager.registerNetworkCallback(
                NetworkRequest.Builder().build(),
                networkCallback
            )
        }
    }
}

要开始接收网络状态更新，请分别调用 resumeListeningNetworkChanges 和停止 pauseListeningNetworkChanges。

更新：如何在已弃用的和新的之间切换 API

请注意，即使您使用此解决方案，您仍然会收到一条消息，表明您使用的特定代码已被弃用！它完全没问题，只要您提供一个可以在新 API 和旧的、已弃用的 API.

之间切换的实现，就不会被视为错误。

这是一个近似解。由于新的 classes 是在 API 级别 29 中添加的，我们必须使用 Build.VERSION_CODES.Q 因为它是一个整数，其值为 29.

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {         
   // Use new API here
} else {
   // Use old API here
}

NetworkInfo 和 WifiConfiguration 已在 SDK 22 中弃用

NetworkInfo and WifiConfiguration has been deprecated in SDK 22

java

android

deprecated

wifi

更新：如何在已弃用的和新的之间切换 API