android：判断当前网络2g、3g、4g、wifi

网上找的，这里就记录一下用法，直接上代码。

/** * 检测当前网络 */public class NetWorkUtil {    public static Boolean getNetworkType(Context context) {        String strNetworkType = "";        ConnectivityManager cm = (ConnectivityManager) context                .getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo networkInfo = cm.getActiveNetworkInfo();        if (networkInfo != null && networkInfo.isConnected()) {            if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {                strNetworkType = "WIFI";                Log.d("logger", "Network Type : " + strNetworkType);                return true;            } else if (networkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {                String _strSubTypeName = networkInfo.getSubtypeName();                Log.e("logger", "Network getSubtypeName : " + _strSubTypeName);                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";                        Log.e("logger", "Network Type : " + strNetworkType);                        return false;                    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("logger", "Network getSubtype : " + Integer.valueOf(networkType).toString());            }        }        Log.e("logger", "Network Type : " + strNetworkType);        return true;    }}测试：
10:08:08.714 10458-10458/com.hf.functiondemo E/logger: Network getSubtypeName : LTE10:08:08.714 10458-10458/com.hf.functiondemo E/logger: Network getSubtype : 1310:08:08.714 10458-10458/com.hf.functiondemo E/logger: Network Type : 4GOK，方便好用。