How to get WIFI signal strength

Question

public int GetStrenght()  
        {  
            Context _context = Android.App.Application.Context;  
  
  
            WifiManager wifiManager = null;  
            wifiManager = (WifiManager)_context.GetSystemService(Context.WifiService);  
  
            if (wifiManager == null)  
            {  
                return 2022;  
            }  
  
            int numberOfLevels = 5;  
  
#pragma warning disable CS0618 // Type or member is obsolete  
            WifiInfo wifiInfo = null;  
            wifiInfo= wifiManager.ConnectionInfo;  
#pragma warning restore CS0618 // Type or member is obsolete  
  
            if (wifiInfo == null)  
            {  
                return 2022;  
            }  
  
#pragma warning disable CS0618 // Type or member is obsolete  
            int level = WifiManager.CalculateSignalLevel(wifiInfo.Rssi, numberOfLevels);  
#pragma warning restore CS0618 // Type or member is obsolete  
  
            return level;  
  
        }  

--It gives me a NullReferenceException error and I don't know why. In this Line wifiInfo= wifiManager.ConnectionInfo;
Thanks

Answer 1

Hello,​

Please add <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> in AndroidManifest.xml, then you can get the wifi signal strength

For more information about this permission, you can refer to this document: https://developer.android.com/reference/android/Manifest.permission#ACCESS_WIFI_STATE

Best Regards,

Leon Lu

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Answer 2

In Addition to what LeonLu suggested try initialising wifiManager like this.

 WifiManager wifiManager = WifiManager.FromContext(Android.App.Application.Context);