How to use Wifimanager.LocalOnlyHotspotCallback in Xamarin.Forms

Question

the environment is Xamarin.forms in android, but there are no Information about this.

how can i get WifiConfiguration from callback.onstarted ?

OR can i WifiManager.LocalOnlyHotspotReservation get value from callback.onstarted ?

please check below code, the code is about to using wifi AP over oreo version

when java code, i refer this article a link

    private WifiManager wifiManager;
    private WifiManager.LocalOnlyHotspotReservation reservation;
    void SetHotSpot()
    {
        wifiManager = (WifiManager)Android.App.Application.Context.GetSystemService(Context.WifiService);

        WifiManager.LocalOnlyHotspotCallback callback = new WifiManager.LocalOnlyHotspotCallback();

        callback.OnStarted( reservation);                  
        wifiManager.StartLocalOnlyHotspot(callback, new Handler());
    }

    void getConfiguration(object sender, System.EventArgs e)
    {
        if (reservation != null)
        {
            Log.Debug("config", reservation.WifiConfiguration.Ssid);
            Log.Debug("config", reservation.WifiConfiguration.NetworkId.ToString());
            Log.Debug("config", reservation.WifiConfiguration.PreSharedKey);
            Log.Debug("config", reservation.WifiConfiguration.Bssid);
        }
    }

but when i click button, reservation is null. so Log Dose not output anything.

making localhotspot and connect some devices to hotspot. don't need internet connection, i need device connection of each other. just like intranet — 이정원, Jan 15 '19 at 02:17
Okay check my answer below note that I have not added the dependency service just converted the native code properly — FreakyAli, Jan 15 '19 at 08:06

FreakyAli · Accepted Answer · 2019-01-15T08:59:51.257

2

I converted the Java code here and came up with the following solution which seems to be working kindly take a look and let me know whether or not it works for you.

Add a Callback class that inherits from WifiManager.LocalOnlyHotspotCallback and pass the Activity in my case it is the MainActivity.

 public class OreoWifiManagerCallback : WifiManager.LocalOnlyHotspotCallback
{
    private const string TAG = nameof(OreoWifiManagerCallback);

    private MainActivity mainActivity;

    public OreoWifiManager(Activity _activity)
    {
        if (_activity.GetType() == typeof(MainActivity))
            mainActivity = (MainActivity)_activity;
    }

    public override void OnStarted(WifiManager.LocalOnlyHotspotReservation reservation)
    {
        base.OnStarted(reservation);
        Log.Debug(TAG, "Wifi Hotspot is on now");
        mainActivity.mReservation = reservation;
    }

    public override void OnFailed([GeneratedEnum] LocalOnlyHotspotCallbackErrorCode reason)
    {
        base.OnFailed(reason);
        Log.Debug(TAG, "onStopped: ");
    }

    public override void OnStopped()
    {
        base.OnStopped();
        Log.Debug(TAG, "onFailed: ");
    }
}

Then add a property in the MainActivity to keep track of the reservations

public WifiManager.LocalOnlyHotspotReservation mReservation { get; set; }

And then use these methods to turn on or off wifi in that Activity, also note that you can have a global field for wifi manager if needed.

 private void TurnOnHotspot()
    {
        var WifiManager = (WifiManager)this.Application.GetSystemService(Android.Content.Context.WifiService);
        WifiManager.StartLocalOnlyHotspot(new OreoWifiManagerCallback(this), new Handler());
    }

    private void TurnOffHotspot()
    {
        if (mReservation != null)
        {
            mReservation.Close();
        }
    }

Good luck

Feel free to revert at any time

edited Jan 15 '19 at 08:59

answered Jan 15 '19 at 08:05

FreakyAli

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Thanks, G.hakim. It works well for me. i studied a lot from here. – 이정원 Jan 15 '19 at 08:55
Could you add the dependency service code? I can't get to work. Also, what would you have to do for iOS? – Jakar510 Feb 03 '20 at 23:48
@FreakyAli can you share sample android code to share file between 2 android device.. – ninja jack Jul 22 '20 at 08:13
@ninjajack Check https://acadgild.com/blog/how-to-transfer-files-using-wi-fi-pair-connection-in-android – FreakyAli Jul 22 '20 at 08:47
@FreakyAli Can i fixed here preSharedKey key ? – Hardik Parmar Oct 27 '22 at 06:26
@FreakyAli Can i fixed here preSharedKey ? – Hardik Parmar Oct 27 '22 at 06:28
I am not sure what do you mean... – FreakyAli Oct 27 '22 at 07:08
@FreakyAli I would like to set static password. – Hardik Parmar Oct 27 '22 at 10:18
@HardikParmar That would be handled from your side with a password logic... – FreakyAli Oct 27 '22 at 11:03
@FreakyAli I have try that logic but not working. – Hardik Parmar Oct 27 '22 at 11:17
Explain not working!! – FreakyAli Oct 27 '22 at 11:59

How to use Wifimanager.LocalOnlyHotspotCallback in Xamarin.Forms

1 Answers1