一个小小的工具：获取当前手机的联网方式。

原文：http://www.cnblogs.com/meteoric_cry/p/4627075.html

一个小小的工具：获取当前手机的联网方式。好像原作者还处理了一些比较蛋疼的情况。

package cn.iautos.testapplication20170612;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.telephony.TelephonyManager;

public class NetworkUtils {

    public static String getNetTypeName(Context context) {
        String strNetworkType = "";

        NetworkInfo networkInfo = ((ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE)).getActiveNetworkInfo();

        if (networkInfo != null && networkInfo.isAvailable() && networkInfo.isConnected()) {
            if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
                strNetworkType = "WIFI";
            } else if (networkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
                String _strSubTypeName = networkInfo.getSubtypeName();

                // TD-SCDMA   networkType is 17
                int networkType = networkInfo.getSubtype();
                switch (networkType) {
                    case TelephonyManager.NETWORK_TYPE_GPRS:
                    case TelephonyManager.NETWORK_TYPE_EDGE:
                    case TelephonyManager.NETWORK_TYPE_CDMA:
                    case TelephonyManager.NETWORK_TYPE_1xRTT:
                    case TelephonyManager.NETWORK_TYPE_IDEN: //api<8 : replace by 11
                        strNetworkType = "2G";
                        break;
                    case TelephonyManager.NETWORK_TYPE_UMTS:
                    case TelephonyManager.NETWORK_TYPE_EVDO_0:
                    case TelephonyManager.NETWORK_TYPE_EVDO_A:
                    case TelephonyManager.NETWORK_TYPE_HSDPA:
                    case TelephonyManager.NETWORK_TYPE_HSUPA:
                    case TelephonyManager.NETWORK_TYPE_HSPA:
                    case TelephonyManager.NETWORK_TYPE_EVDO_B: //api<9 : replace by 14
                    case TelephonyManager.NETWORK_TYPE_EHRPD:  //api<11 : replace by 12
                    case TelephonyManager.NETWORK_TYPE_HSPAP:  //api<13 : replace by 15
                        strNetworkType = "3G";
                        break;
                    case TelephonyManager.NETWORK_TYPE_LTE:    //api<11 : replace by 13
                        strNetworkType = "4G";
                        break;
                    default:
                        // http://baike.baidu.com/item/TD-SCDMA 中国移动 联通 电信 三种3G制式
                        if (_strSubTypeName.equalsIgnoreCase("TD-SCDMA") || _strSubTypeName.equalsIgnoreCase("WCDMA") || _strSubTypeName.equalsIgnoreCase("CDMA2000")) {
                            strNetworkType = "3G";
                        } else {
                            strNetworkType = _strSubTypeName;
                        }

                        break;
                }
            }
        } else {
            strNetworkType = "无网络";
        }

        return strNetworkType;
    }
}

配合以下代码可以动态监听网络连接的变化：

原文：http://blog.youkuaiyun.com/qq_32368129/article/details/54406861

package cn.iautos.testapplication20170612;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.util.Log;
import android.widget.Toast;

public class NetworkConnectChangedReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
    /*    if (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(intent.getAction())) {// 监听wifi的打开与关闭，与wifi的连接无关
            int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, 0);
            Log.e("TAG", "wifiState:" + wifiState);
            switch (wifiState) {
                case WifiManager.WIFI_STATE_DISABLED:
                    break;
                case WifiManager.WIFI_STATE_DISABLING:
                    break;
            }
        }
        // 监听wifi的连接状态即是否连上了一个有效无线路由
        if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(intent.getAction())) {
            Parcelable parcelableExtra = intent
                    .getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
            if (null != parcelableExtra) {
                // 获取联网状态的NetWorkInfo对象
                NetworkInfo networkInfo = (NetworkInfo) parcelableExtra;
                //获取的State对象则代表着连接成功与否等状态
                NetworkInfo.State state = networkInfo.getState();
                //判断网络是否已经连接
                boolean isConnected = state == NetworkInfo.State.CONNECTED;
                Log.e("TAG", "isConnected:" + isConnected);
                if (isConnected) {
                } else {

                }
            }
        }*/

        // 监听网络连接，包括wifi和移动数据的打开和关闭,以及连接上可用的连接都会接到监听
        if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {

            String netTypeName = NetworkUtils.getNetTypeName(context);
            Toast.makeText(context, netTypeName, Toast.LENGTH_SHORT).show();
            Log.e("网络检查demo", netTypeName);
            

          /*  //获取联网状态的NetworkInfo对象
            NetworkInfo info = intent
                    .getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
            if (info != null) {
                //如果当前的网络连接成功并且网络连接可用
                if (NetworkInfo.State.CONNECTED == info.getState() && info.isAvailable()) {
                    if (info.getType() == ConnectivityManager.TYPE_WIFI) {
                    } else if (info.getType() == ConnectivityManager.TYPE_MOBILE) {
                    }
                } else {
                }
            }*/
        }
    }
}

注释中的代码是监听不同情况。在这里未采用原文的监听方式，而是将两个demo结合起来。