Bug? Simple Wifi (MLWifi) not working correctly with Android 9

Computersmith64 said:

As was reported in this thread, the MLWifi library does not work correctly in apps running on Android 9 devices. I have tested with a small B4A app connecting to a small B4R app running on a Wemos D1R2 board (both projects attached) & found that even when the B4A app is connected to the B4R access point, MLWifi reports isWifiConnected as False. This happens regardless of whether the Android device is already connected to the AP before the app runs, or whether the app makes the connection. The issue is not that the app can't connect to the AP - the issue is that MLWifi incorrectly reports as not being connected.

On a pre-Android 9 device it works fine (as I have proven with multiple B4R/B4A projects I have written).

The 2 projects are attached for your testing pleasure...

Click to expand...

LogColor ("testWiFi.isWifiConnected" & testWiFi.isWifiConnected, Colors.Blue)

bgsoft said:

Hi, I have tested your project on a Samsung Galaxy 8+ with Android 9 and is WIFIConnected works correctly.
Even if the mobile data is stopped or the location.

I have placed at the beginning of Public Sub ConnectToAP

B4X:

LogColor ("testWiFi.isWifiConnected" & testWiFi.isWifiConnected, Colors.Blue)

And it returns TRUE


regards

Click to expand...

Computersmith64 said:

it still does not work if the connected AP is not also connected to the internet.

Click to expand...

Sub Class_Globals
  
End Sub

'Note: Need this in Manifest
' AddPermission(android.permission.ACCESS_NETWORK_STATE)

Public Sub Initialize

End Sub

Public Sub isWifiConnected() As Boolean
   Dim jo As JavaObject = Me
   Dim r As Reflector
   Return jo.RunMethod("isNetworkConnected", Array(r.GetContext))
End Sub

#if JAVA

import android.content.Context;
import android.net.ConnectivityManager;
import android.os.Build;
import android.net.Network;
import android.net.NetworkInfo;
import android.net.NetworkCapabilities;

//import anywheresoftware.b4a.BA;

//Pretty much a straight rip from https://stackoverflow.com/a/53078141
public boolean isNetworkConnected(Context context) {
    final ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);

    if (cm != null) {
        if (Build.VERSION.SDK_INT < 23) {
           //BA.Log("Build SDK < 23");
            NetworkInfo ni = cm.getActiveNetworkInfo();
            if (ni != null) {
                return (ni.isConnected() && (ni.getType() == ConnectivityManager.TYPE_WIFI));
            }
        } else {
           //BA.Log("Build SDK >= 23");
            Network n = cm.getActiveNetwork();
            if (n != null) {
                final NetworkCapabilities nc = cm.getNetworkCapabilities(n);
                return (nc.hasTransport(NetworkCapabilities.TRANSPORT_WIFI));
            }
        }
    }
    return false;
}

#End If

OliverA said:

Ok, below is the fixed class code. It's pretty much a straight copy from a stackoverlfow post (link in source). It should work with all versions of Android as of now (and at least through Q). Try it and let me know if it works for your scenario.

B4X:

Sub Class_Globals
 
End Sub

'Note: Need this in Manifest
' AddPermission(android.permission.ACCESS_NETWORK_STATE)

Public Sub Initialize

End Sub

Public Sub isWifiConnected() As Boolean
   Dim jo As JavaObject = Me
   Dim r As Reflector
   Return jo.RunMethod("isNetworkConnected", Array(r.GetContext))
End Sub

#if JAVA

import android.content.Context;
import android.net.ConnectivityManager;
import android.os.Build;
import android.net.Network;
import android.net.NetworkInfo;
import android.net.NetworkCapabilities;

//import anywheresoftware.b4a.BA;

//Pretty much a straight rip from https://stackoverflow.com/a/53078141
public boolean isNetworkConnected(Context context) {
    final ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);

    if (cm != null) {
        if (Build.VERSION.SDK_INT < 23) {
           //BA.Log("Build SDK < 23");
            NetworkInfo ni = cm.getActiveNetworkInfo();
            if (ni != null) {
                return (ni.isConnected() && (ni.getType() == ConnectivityManager.TYPE_WIFI));
            }
        } else {
           //BA.Log("Build SDK >= 23");
            Network n = cm.getActiveNetwork();
            if (n != null) {
                final NetworkCapabilities nc = cm.getNetworkCapabilities(n);
                return (nc.hasTransport(NetworkCapabilities.TRANSPORT_WIFI));
            }
        }
    }
    return false;
}

#End If

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