要使用 Kotlin 监控 Android 中的互联网连接，您可以使用该类ConnectivityManager，这是一个允许您查询网络状态的系统服务。以下是如何使用它的示例：
- 1. 将以下权限添加到您的 AndroidManifest.xml 文件：
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />- 1. 创建一个监控网络状态的类：
class NetworkMonitor(context: Context) { private val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager fun isNetworkAvailable(): Boolean { val networkInfo = connectivityManager.activeNetworkInfo return networkInfo != null && networkInfo.isConnected } fun registerNetworkCallback(networkCallback: ConnectivityManager.NetworkCallback) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { connectivityManager.registerDefaultNetworkCallback(networkCallback) } else { val builder = NetworkRequest.Builder() connectivityManager.registerNetworkCallback(builder.build(), networkCallback) } } fun unregisterNetworkCallback(networkCallback: ConnectivityManager.NetworkCallback) { connectivityManager.unregisterNetworkCallback(networkCallback) }}在上面的类中，我们创建了三个函数：
- •
isNetworkAvailable()：此功能检查设备是否连接到互联网。它返回一个布尔值。 - •
registerNetworkCallback()：此函数注册一个NetworkCallback对象来监听网络状态变化。它以一个NetworkCallback对象作为参数。 - •
unregisterNetworkCallback()：此函数取消注册以前注册的NetworkCallback对象。它以一个NetworkCallback对象作为参数。
- 1. 创建
NetworkCallback监听网络状态变化的对象：
val networkCallback = object : ConnectivityManager.NetworkCallback() { override fun onAvailable(network: Network) { // Called when a network is available } override fun onLost(network: Network) { // Called when a network is lost }}- 1.
NetworkCallback向NetworkMonitor类注册对象：
val networkMonitor = NetworkMonitor(context)networkMonitor.registerNetworkCallback(networkCallback)- 1. 最后，不要忘记
NetworkCallback在不再需要时注销该对象：
networkMonitor.unregisterNetworkCallback(networkCallback)- • 使用
BroadcastReceiver检查网络连接事件：
class ConnectivityReceiver : BroadcastReceiver() { override fun onReceive(context: Context, intent: Intent) { val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager val networkInfo = connectivityManager.activeNetworkInfo if (networkInfo != null && networkInfo.isConnected) { // internet connection is available } else { // internet connection is not available } }}使用回调接口在网络连接发生变化时发出通知：
interface ConnectivityListener { fun onConnectivityChanged(isConnected: Boolean)}class ConnectivityMonitor(private val context: Context) { private val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager private val callbackList = mutableListOf<ConnectivityListener>() private val connectivityCallback = object : ConnectivityManager.NetworkCallback() { override fun onAvailable(network: Network) { notifyListeners(true) } override fun onLost(network: Network) { notifyListeners(false) } } fun registerListener(listener: ConnectivityListener) { callbackList.add(listener) } fun unregisterListener(listener: ConnectivityListener) { callbackList.remove(listener) } fun startMonitoring() { val builder = NetworkRequest.Builder() connectivityManager.registerNetworkCallback(builder.build(), connectivityCallback) } fun stopMonitoring() { connectivityManager.unregisterNetworkCallback(connectivityCallback) } private fun notifyListeners(isConnected: Boolean) { for (listener in callbackList) { listener.onConnectivityChanged(isConnected) } }}- • 使用像
RxAndroid这样的库来监控网络连接：
class MainActivity : AppCompatActivity() { private val connectivityObservable = ConnectivityObservable() override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) connectivityObservable.observe(this) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe { isConnected -> if (isConnected) { // internet connection is available } else { // internet connection is not available } } } override fun onDestroy() { super.onDestroy() connectivityObservable.stopObserving(this) }}参考链接
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