转载 https://www.jianshu.com/p/66afbd05c9b9

以前监听网络变化都是使用的广播，现在换一种方式 ConnectivityManager.NetworkCallback

可以监听到 蜂窝网络，wifi,USB外接网卡网络变化，没有过多测试，我主要测试的 USB 网卡网络变化，应该各种网络变化都可以监听到。

1、写一个监听类

package com.tky.phm.net;

import android.net.ConnectivityManager;

import android.net.Network;

import android.net.NetworkCapabilities;

import android.os.Build;

import android.support.annotation.RequiresApi;

import android.util.Log;

@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)

public class NetworkCallbackImplextends ConnectivityManager.NetworkCallback {

private StringTAG ="NetworkCallbackImpl";

    @Override

    public void onAvailable(Network network) {

super.onAvailable(network);

        Log.d(TAG, "onAvailable: 网络已连接");

    }

@Override

    public void onLost(Network network) {

super.onLost(network);

        Log.e(TAG, "onLost: 网络已断开");

    }

@Override

    public void onCapabilitiesChanged(Network network, NetworkCapabilities networkCapabilities) {

super.onCapabilitiesChanged(network, networkCapabilities);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {

if (networkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED)) {

if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {

Log.d(TAG, "onCapabilitiesChanged: 网络类型为wifi");

                }else if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {

Log.d(TAG, "onCapabilitiesChanged: 蜂窝网络");

                }else {

Log.d(TAG, "onCapabilitiesChanged: 其他网络");

                }

}

}

}

}

2、注册监听类

try {

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {

NetworkCallbackImpl networkCallback =new NetworkCallbackImpl();

        NetworkRequest.Builder builder =null;

        builder =new NetworkRequest.Builder();

        NetworkRequest request = builder.build();

        ConnectivityManager connMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

        if (connMgr !=null) {

connMgr.registerNetworkCallback(request, networkCallback);

        }

}

}catch (Exception e) {

e.printStackTrace();

}

3、添加网络权限

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

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

4、结束