判断是2G网络还是3G网络

public static boolean isConnectionFast(int type, int subType){
        if(type==ConnectivityManager.TYPE_WIFI){
            System.out.println("CONNECTED VIA WIFI");
            return true;
        }else if(type==ConnectivityManager.TYPE_MOBILE){
            switch(subType){
            case TelephonyManager.NETWORK_TYPE_1xRTT:
                return false; // ~ 50-100 kbps
            case TelephonyManager.NETWORK_TYPE_CDMA:
                return false; // ~ 14-64 kbps
            case TelephonyManager.NETWORK_TYPE_EDGE:
                return false; // ~ 50-100 kbps
            case TelephonyManager.NETWORK_TYPE_EVDO_0:
                return true; // ~ 400-1000 kbps
            case TelephonyManager.NETWORK_TYPE_EVDO_A:
                return true; // ~ 600-1400 kbps
            case TelephonyManager.NETWORK_TYPE_GPRS:
                return false; // ~ 100 kbps
//            case TelephonyManager.NETWORK_TYPE_HSDPA:
//                return true; // ~ 2-14 Mbps
//            case TelephonyManager.NETWORK_TYPE_HSPA:
//                return true; // ~ 700-1700 kbps
//            case TelephonyManager.NETWORK_TYPE_HSUPA:
//                return true; // ~ 1-23 Mbps
            case TelephonyManager.NETWORK_TYPE_UMTS:
                return true; // ~ 400-7000 kbps
            // NOT AVAILABLE YET IN API LEVEL 7
            case Connectivity.NETWORK_TYPE_EHRPD:
                return true; // ~ 1-2 Mbps
            case Connectivity.NETWORK_TYPE_EVDO_B:
                return true; // ~ 5 Mbps
            case Connectivity.NETWORK_TYPE_HSPAP:
                return true; // ~ 10-20 Mbps
            case Connectivity.NETWORK_TYPE_IDEN:
                return false; // ~25 kbps
            case Connectivity.NETWORK_TYPE_LTE:
                return true; // ~ 10+ Mbps
            // Unknown
            case TelephonyManager.NETWORK_TYPE_UNKNOWN:
                return false;
            default:
                return false;
            }
        }else{
            return false;
        }
    }