判断网络状态，2G,3G,Wifi

package com.example.administrator.tv51365.utils;

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

/**
 * Created by Administrator on 2016/3/21 0021.
 */
public class NetTypeUtil {
    public  Context context = null;




    public static String GetNetworkType(final Context context)
    {
        String strNetworkType = "";
        final ConnectivityManager conManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
        final NetworkInfo networkInfo = conManager.getActiveNetworkInfo();

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

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

                Log.e("cocos2d-x", "Network getSubtypeName : " + _strSubTypeName);

                // 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;
                }

                Log.e("cocos2d-x", "Network getSubtype : " + Integer.valueOf(networkType).toString());
            }
        }

        Log.e("cocos2d-x", "Network Type : " + strNetworkType);

        return strNetworkType;
    }
}