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 : LTE
10:08:08.714 10458-10458/com.hf.functiondemo E/logger: Network getSubtype : 13
10:08:08.714 10458-10458/com.hf.functiondemo E/logger: Network Type : 4G

OK，方便好用。