Question 126911 in Android Studio Question posted in
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Android Studio – How to fix the problem with error "No virtual method" on android

I am writing an application in android studio for android Pie.
I want to get wifi info.

    @RequiresApi(api = Build.VERSION_CODES.S)
    public String getData() {       
 
        String wifiDataTest;
        WifiInfo wifiInfo = wifiManager.getConnectionInfo();
        int frequency = wifiInfo.getFrequency();
        int ipAddress = wifiInfo.getIpAddress();
        int speed = wifiInfo.getLinkSpeed();
        String ssid = wifiInfo.getSSID();
        int wifiStandard = wifiInfo.getWifiStandard();

        wifiDataTest = "Frequency [MHz]: " + frequency + "nIP address: " + ipAddress
                + "nSpeed [Mbps]: " + speed + "nSSID: " + ssid  + "nWifi standard: " + wifiStandard;


        return "WIFIn" + wifiDataTest;
    }

With int wifiStandard = wifiInfo.getWifiStandard (); shows me the error:

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.sensors, PID: 11040
    java.lang.NoSuchMethodError: No virtual method getWifiStandard()I in class Landroid/net/wifi/WifiInfo; or its super classes (declaration of 'android.net.wifi.WifiInfo' appears in /system/framework/framework.jar)

I have not found information about such an error anywhere. Everything before getWifiStandard (); worked fine.

Tags:

2

Answers


  1. 0

    You’re trying to run your app which contains the getWifiStandard() method that exists ONLY on Android 11 or up.

    Try this :

    public String getData() {

        String wifiDataTest;
        WifiInfo wifiInfo = wifiManager.getConnectionInfo();
        int frequency = wifiInfo.getFrequency();
        int ipAddress = wifiInfo.getIpAddress();
        int speed = wifiInfo.getLinkSpeed();
        String ssid = wifiInfo.getSSID();
        String wifiStandard = "";
        
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.R) {
            wifiDataTest = "Frequency [MHz]: " + frequency + "nIP address: " + ipAddress
                    + "nSpeed [Mbps]: " + speed + "nSSID: " + ssid + "nWifi standard: " + wifiInfo.getWifiStandard();
        } else {
            if (wifiInfo.getLinkSpeed() <= 11) wifiStandard =  "802.b";
            else if (wifiInfo.getLinkSpeed() <= 54) wifiStandard =  "802.g";
            else if (wifiInfo.getLinkSpeed() <= 300) wifiStandard =  "802.11n";
            else if (wifiInfo.getLinkSpeed() <= 866.5) wifiStandard =  "802.11ac";
            
            wifiDataTest = "Frequency [MHz]: " + frequency + "nIP address: " + ipAddress
                    + "nSpeed [Mbps]: " + speed + "nSSID: " + ssid + "nWifi standard: " + wifiStandard;
        }
       
        return "WIFIn" + wifiDataTest;
    }
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  2. 0

    Situtation 1: It’s maybe you just reference to the function, missing ()

    • wrong example:

      fun main(callback: () -> Unit) = callback

    • correct example:

      fun main(callback: () -> Unit) = callback()

    Situtation 2: the function is a Job, needed to be an Unit

    • wrong example:

      fun main(callback: () -> Unit) =
      MainScope().launch {
      callback()
      }

    • correct example:

      fun main(callback: () -> Unit) {
      MainScope().launch {
      callback()
      }
      }

    Situtation 3: just Google & God know ;))

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