检测Android设备有线网络连接状态

import android.net.ConnectivityManager;

ConnectivityManager conn = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo[] networkInfo = conn.getAllNetworkInfo();
if(networkInfo != null){
for(int i=0;i<networkInfo.length;i++){
if(networkInfo[i].getType() == ConnectivityManager.TYPE_ETHERNET){
//有线网络连接成功，更新UI
}
}
}

//监听有线网络连接状态（插拔网线）

private BroadcastReceiver mEthernetReceiver = new BroadcastReceiver(){

@Override
public void onReceive(Context context, Intent intent) {

if (intent.getAction().equals(ConnectivityManager.ACTION_ETHERNET_STATE_CHANGED)){
String state = intent.getStringExtra(ConnectivityManager.EXTRA_ETH_STATUS);
if(state.equals(ConnectivityManager.EXTRA_ETH_CONNECT)){
//网线连接成功！
}
else if(state.equals(ConnectivityManager.EXTRA_ETH_UNLINK)){
//网线断开！
}
}
}
};

IntentFilter filter = new IntentFilter();
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
filter.addAction(ConnectivityManager.INET_CONDITION_ACTION);
filter.addAction(ConnectivityManager.ACTION_ETHERNET_STATE_CHANGED);
filter.addAction(ConnectivityManager.ACTION_ETHERNET_DONGLE_IN);
filter.addAction(ConnectivityManager.ACTION_ETHERNET_DONGLE_OUT);
registerReceiver(mEthernetReceiver, filter);

添加权限：

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

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

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