Xamarin TelephonyManager requestCellInfoUpdate how run?

Question

Xamarin TelephonyManager requestCellInfoUpdate how run?

DustOfRust 141

How to run this method?

public void requestCellInfoUpdate (Executor executor, 
                TelephonyManager.CellInfoCallback callback)

My code:

    TelephonyManager tm = (TelephonyManager)this.GetSystemService(TelephonyService);
    tm.RequestCellInfoUpdate(MainExecutor, new TelephonyManager.CellInfoCallback());

new TelephonyManager.CellInfoCallback()) - this is a problem with that, but I don't know. How to start it and what to enter? From what I can see it's an abstract class?

I can't find anything in the Xamarin documentation. And in the Adnroid documentation, I found that it is necessary to call it from API29 to refresh the information.

Apps targeting Android Q or higher will no longer trigger a refresh of the cached CellInfo by invoking this API. Instead, those apps will receive the latest cached results, which may not be current. Apps targeting Android Q or higher that wish to request updated CellInfo should call requestCellInfoUpdate(); however, in all cases, updates will be rate-limited and are not guaranteed. To determine the recency of CellInfo data, callers should check CellInfo#getTimeStamp().

https://developer.android.com/reference/android/telephony/TelephonyManager#requestCellInfoUpdate(java.util.concurrent.Executor,%20android.telephony.TelephonyManager.CellInfoCallback)

DustOfRust 141

And how to get data from OnCellInfo to other class or show send to textMessage?

public override void OnCellInfo(IList<CellInfo> cellInfo)
            {
                foreach (var item in cellInfo)
                {
                    //item.CellIdentity.
                    textMessage.Text += "\n\n" + item.GetType() + "\n";  //- error CS0120 An object reference is required for the non-static field, method, or property 'MainActivity.textMessage'

                }
            }

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DustOfRust 141 Reputation points

2021-04-15T15:19:56.453+00:00

And how to get data from OnCellInfo to other class or show send to textMessage?

public override void OnCellInfo(IList<CellInfo> cellInfo) { foreach (var item in cellInfo) { //item.CellIdentity. textMessage.Text += "\n\n" + item.GetType() + "\n"; //- error CS0120 An object reference is required for the non-static field, method, or property 'MainActivity.textMessage' } }

Answer 1

Cole Xia (Shanghai Wicresoft Co,.Ltd.) 6,756

Hello,

Welcome to Microsoft Q&A!

We can create a new class inherit from the abstract class TelephonyManager.CellInfoCallback , and override the method OnCellInfo inside the new class .

Check the code below

   public class MyCallBack : TelephonyManager.CellInfoCallback  
       {  
           public override void OnCellInfo(IList<CellInfo> cellInfo)  
           {  
               //here get cell info  
           }  
       }  
     
    TelephonyManager tm = (TelephonyManager)this.GetSystemService(TelephonyService);  
    tm.RequestCellInfoUpdate(MainExecutor, new MyCallBack());

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DustOfRust 141

And how to pass data from OnCellInfo to other class or show send to textMessage?

public override void OnCellInfo(IList<CellInfo> cellInfo)
            {
                foreach (var item in cellInfo)
                {
                    //item.CellIdentity.
                    textMessage.Text += "\n\n" + item.GetType() + "\n";  //- error CS0120 An object reference is required for the non-static field, method, or property 'MainActivity.textMessage'

                }
            }

Cole Xia (Shanghai Wicresoft Co,.Ltd.) 6,756

You could use MessagingCenter to send the data to the other class .

Send

   public override void OnCellInfo(IList<CellInfo> cellInfo)  
           {  
                foreach (var item in cellInfo)  
                    {  
                        //item.CellIdentity.  
                        string data;  
                        data += "\n\n" + item.GetType() + "\n";    
     
                        MessagingCenter.Send<object, string>(this, "Hi", data );  
                    }  
           }

Subscribe in other class

   MessagingCenter.Subscribe<object, string>(this, "Hi", (sender, arg) =>  
   {  
       textMessage.Text = arg;  
   });

DustOfRust 141 Reputation points

2021-04-16T12:02:42.357+00:00

The question is why OnCellInfo doesn't return the requested items from CellInfoNr?

The terminal is 5G, in the NSA architecture, connected to a 5G cell.
OnCellInfo GetType returns CellInfoLte, CellInfoWCDMA to me, but when I connect it to a 5G cell, I don't know why I don't have CellInfoNr.

How to poll the TelephonyManager correctly to get CellInfoNr information?

This is Android 10.
I checked with other applications from the google store and I can see that my phone displays these CellInfoNr parameters.

I'm using 5G NSA and maybe that's why OnCellInfo doesn't return CellInfoNr?
But if so how do you get it?

DustOfRust 141

I found the solution, I am looking for SS RSRP NR in the wrong place;)
A good place is:

  TelephonyManager tm = (TelephonyManager)this.GetSystemService(TelephonyService);
            foreach (var item in tm.SignalStrength.CellSignalStrengths)
            {
                textMessage.Text += "\n Type:" + item.GetType();
                if (item.GetType() == typeof(CellSignalStrengthNr))
                {
                    textMessage.Text += "SS RSRP: " + ((CellSignalStrengthNr)item).SsRsrp.ToString() + "\n";
                    textMessage.Text += "SS RSRQ: " + ((CellSignalStrengthNr)item).SsRsrq.ToString() + "\n";
                    textMessage.Text += "SS SINR: " + ((CellSignalStrengthNr)item).SsSinr.ToString() + "\n";

                }
            }

Cole Xia (Shanghai Wicresoft Co,.Ltd.) 6,756 Reputation points

2021-04-17T06:52:29.993+00:00

Nice ! If you have any other problem please let me know.

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Xamarin TelephonyManager requestCellInfoUpdate how run?

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