监听 Internet 变化（无网络检测）

Question

注册以下监听器会在互联网连接发生变化时还是仅在网络连接发生变化时通知您的应用？

即使手机仍连接到同一网络，我也需要在互联网开启或关闭时收到通知。

<receiver
        android:name="com.internetconnection_demo.InternetConnector_Receiver"
        android:enabled="true" >
        <intent-filter>

            <!-- Intent filters for broadcast receiver -->
            <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
            <action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
            <action android:name="android.net.wifi.STATE_CHANGE" />
        </intent-filter>
    </receiver>

Answer 1

如果您使用 Lollipop (API 21) 或更高版本，我不会使用 BroadcastReceiver 路线。尝试这样的事情：

fun monitorWifiConnection() {
    var connectivityManager: ConnectivityManager = getSystemService(CONNECTIVITY_SERVICE) as ConnectivityManager
    val builder = NetworkRequest.Builder()
            .addTransportType(android.net.NetworkCapabilities.TRANSPORT_WIFI)
    connectivityManager.registerNetworkCallback(builder.build(), getConnectivityManagerCallback())
}

private fun getConnectivityManagerCallback(): ConnectivityManager.NetworkCallback {
    connectivityManagerCallback = object : ConnectivityManager.NetworkCallback() {
        override fun onAvailable(network: Network?) {
            //Connected to wifi
        }

        override fun onLost(network: Network?) {
            //Lost connection to wifi
        }
    }
    return connectivityManagerCallback
}

通过排除NetworkCapabilities.TRANSPORT_CELLULAR 选项并包括NetworkCapabilities.TRANSPORT_WIFI，您应该只收到有关wifi 连接的通知。