android - 搜索 4G 网络

Question

如何以编程方式（适用于 Android）搜索 4G 网络并获得结果？

更清楚一点：当我单击一个按钮时，它会搜索所有可用的 4G 网络并在列表中显示结果。

编辑：

我需要一个代码结果和类似的东西： 这是您在手机上搜索网络时

Answer 1

看这里 -->_{如何判断网络类型是2G、3G还是4G}

getNetworkType()将为您返回NETWORK_TYPE_xxxx当前数据连接，我在工作的答案中选择了此方法，在这些开关案例中添加您想要过滤的任何网络类型

您可以将以下方法直接放在 Utility 类中：

    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";
        }
    }

阅读文档清晰明了 - > _{https://developer.android.com/reference/android/telephony/TelephonyManager.html#getNetworkType()}

编辑

如果你想进行扫描，你需要创建一个BroadcastReceiver来监听 Wifi 扫描结果：并过滤NETWORK_TYPE_LTE

private final BroadcastReceiver mWifiScanReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context c, Intent intent) {
        if (intent.getAction().equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {
            List<ScanResult> mScanResults = mWifiManager.getScanResults();
            // add your logic here to filter
        }
    }
}

在onCreate()您将分配mWifiManager并启动扫描：

mWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
registerReceiver(mWifiScanReceiver,
        new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
mWifiManager.startScan();

Answer 2

    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;
        }