4中情况。1.无网  2.wifi 3.移动信号 4.网线

BroadcastReceiver netReceiver =new BroadcastReceiver(){

@Override

public void onReceive(Context context, Intent intent) {

String action = intent.getAction();

if (action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) {

ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(

Context.CONNECTIVITY_SERVICE);

NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

if (networkInfo != null && networkInfo.isAvailable()) {

int type2 = networkInfo.getType();

String typeName = networkInfo.getTypeName();

tv.setText(type2+"--"+typeName);

switch (type2) {

case 0://移动 网络 2G 3G 4G 都是一样的 实测 mix2s 联通卡

break;

case 1: //wifi网络

break;

case 9: //网线连接

break;

}

} else {// 无网络

}

}

}

};

进行注册启动广播

/**

* 注册网络监听的广播

*/

private void initReceiver() {

IntentFilter timeFilter = new IntentFilter();

timeFilter.addAction("android.net.ethernet.ETHERNET_STATE_CHANGED");

timeFilter.addAction("android.net.ethernet.STATE_CHANGE");

timeFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");

timeFilter.addAction("android.net.wifi.WIFI_STATE_CHANGED");

timeFilter.addAction("android.net.wifi.STATE_CHANGE");

timeFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);

registerReceiver(netReceiver, timeFilter);

}

在ondestory()销毁：

@Override

protected void onDestroy() {

super.onDestroy();

if (netReceiver != null) {

unregisterReceiver(netReceiver);

netReceiver = null;

}

}

清单权限添加

转自博客https://blog.csdn.net/u012560369/article/details/80579029