4G网络搜索

Question

如何以编程方式(对于Android)搜索4G网络并获得结果？

更清楚的是:当我点击一个按钮时，它会搜索所有可用的4G网络，并将结果显示在列表中。

编辑：

我需要一个代码的结果和类似这样的东西：这是你在手机上搜索网络的时候。

Answer 1

    public String getNetworkClass(Context context) {
        TelephonyManager mTelephonyManager = (TelephonyManager)
                context.getSystemService(Context.TELEPHONY_SERVICE);
        int networkType = mTelephonyManager.getNetworkType();
        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:
                return "2G";
            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:
            case TelephonyManager.NETWORK_TYPE_EHRPD:
            case TelephonyManager.NETWORK_TYPE_HSPAP:
                return "3G";
            case TelephonyManager.NETWORK_TYPE_LTE:
                return "4G";
            default:
                return "Unknown";
        }
    }


Also, I would first check if connected network is WiFi or Mobile.   

     public static boolean getActiveNetworkType(Context context) {
            boolean is_wfi_conected = false;
            ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
            if (activeNetwork != null  && activeNetwork.isConnected() && activeNetwork.isAvailable()) { // connected to the internet
                if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
                    // connected to Wifi
                    //GET IP Address of connected WIFI
                  //  WifiManager wm = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
                    is_wfi_conected = true;


                } else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
                    is_wfi_conected = false;
                }
            } else {
                // not connected to the internet
            }
            return is_wfi_conected;
        }