Android Question MAC address Android 6

Rusty · Jun 21, 2016

I found the following code on the internet which purportedly allows access to the MAC address on Android 6.
I've tried to embed it into my code but it fails.

B4X:

#if java
    public static String getMacAddr() {
    try {
        List<NetworkInterface> all = Collections.list(NetworkInterface.getNetworkInterfaces());
        for (NetworkInterface nif : all) {
            if (!nif.getName().equalsIgnoreCase("wlan0")) continue;

            byte[] macBytes = nif.getHardwareAddress();
            if (macBytes == null) {
                return "";
            }

            StringBuilder res1 = new StringBuilder();
            for (byte b : macBytes) {
                res1.append(Integer.toHexString(b & 0xFF) + ":");
            }

            if (res1.length() > 0) {
                res1.deleteCharAt(res1.length() - 1);
            }
            return res1.toString();
        }
    } catch (Exception ex) {
    }
    return "02:00:00:00:00:00";
}
    #end if
   
Sub GetMAC As String
    NativeMe.InitializeContext
    Dim s As String = NativeMe.RunMethod("GetMacAddr", Null)
    Return s
End Sub

It says:

error: cannot find symbol
List<NetworkInterface> all = Collections.list(NetworkInterface.getNetworkInterfaces());

any suggestions would be appreciated.
Rusty

JordiCP · Jun 21, 2016

You need to import the classes used

B4X:

#if java

import java.net.NetworkInterface;
import java.util.Collections;
import java.util.List;

    public static String getMacAddr() {
    try {
        List<NetworkInterface> all = Collections.list(NetworkInterface.getNetworkInterfaces());
        for (NetworkInterface nif : all) {
            if (!nif.getName().equalsIgnoreCase("wlan0"))
            continue;

            byte[] macBytes = nif.getHardwareAddress();
            if (macBytes == null) {
                return "";
            }

            StringBuilder res1 = new StringBuilder();
            for (byte b : macBytes) {
                res1.append(Integer.toHexString(b & 0xFF) + ":");
            }

            if (res1.length() > 0) {
                res1.deleteCharAt(res1.length() - 1);
            }
            return res1.toString();
        }
    } catch (Exception ex) {
    }
    return "02:00:00:00:00:00";
}
    #end if
  
Sub GetMAC As String
    NativeMe.InitializeContext
    Dim s As String = NativeMe.RunMethod("GetMacAddr", Null)
    Return s
End Sub

carycai · Aug 2, 2016

The java method name should be the same with RunMethod call.
I just try it, excellent

Rusty · Aug 8, 2016

Private NativeMe As JavaObject 'use Java to access i.e. MAC address on MarshMallow

NativeMe.InitializeContext

Arf · Oct 17, 2016

Hi guys, I am trying to use this method to get the bluetooth MAC in android 6. I've put the following in a service, when I call newGetMAC, I get the errors in the second block of text below. Any help appreciated. I added the JavaObject library.

B4X:

#if java

import java.net.NetworkInterface;
import java.util.Collections;
import java.util.List;

    public static String getMacAddr() {
    try {
        List<NetworkInterface> all = Collections.list(NetworkInterface.getNetworkInterfaces());
        for (NetworkInterface nif : all) {
            if (!nif.getName().equalsIgnoreCase("wlan0"))
            continue;

            byte[] macBytes = nif.getHardwareAddress();
            if (macBytes == null) {
                return "";
            }

            StringBuilder res1 = new StringBuilder();
            for (byte b : macBytes) {
                res1.append(Integer.toHexString(b & 0xFF) + ":");
            }

            if (res1.length() > 0) {
                res1.deleteCharAt(res1.length() - 1);
            }
            return res1.toString();
        }
    } catch (Exception ex) {
    }
    return "02:00:00:00:00:00";
}
#end if

Sub newGetMAC As String
    Private NativeMe As JavaObject
    NativeMe.InitializeContext
    Dim s As String = NativeMe.RunMethod("GetMacAddr", Null)
    Return s
End Sub

Error occurred on line: 570 (Unit_Comms)
java.lang.RuntimeException: Method: GetMacAddr not found in: GoSpiro.MACset.unit_comms
at anywheresoftware.b4j.object.JavaObject$MethodCache.getMethod(JavaObject.java:366)
at anywheresoftware.b4j.object.JavaObject.RunMethod(JavaObject.java:119)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:708)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:337)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:247)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:134)
at anywheresoftware.b4a.debug.Debug.delegate(Debug.java:259)
at GoSpiro.MACset.unit_comms._packethandler(unit_comms.java:560)
at GoSpiro.MACset.unit_comms._astream_newdata(unit_comms.java:527)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:708)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:340)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:247)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:134)
at anywheresoftware.b4a.BA$2.run(BA.java:328)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = false **

Rusty · Oct 17, 2016

I think the #java needs to be defined in the MAIN.

JordiCP · Oct 17, 2016

Java syntax is case-sensitive, so you should call

B4X:

Dim s AsString = NativeMe.RunMethod("getMacAddr", Null)

Arf · Oct 17, 2016

Moved to main and fixed the case - all working, thank you very much.

Arf · Oct 20, 2016

DISASTER!!!
This method works in debug mode, but not in release mode.
Can anyone help? My client is midway through a product trial and this is going to ruin it unless I fix it asap.

JordiCP · Oct 20, 2016

Add this to the manifest editor

B4X:

AddPermission("android.permission.INTERNET")

Arf · Oct 20, 2016

Briliiant! Thanks so much, works.

Arf · Oct 21, 2016

Oops - so that code gets the wifi MAC ("wlan0").
What interface name should I use to get the bluetooth adaptors MAC? I've tried "bth0" but that didn't work.

Arf · Oct 21, 2016

Mmm, I got a list of network adaptors and the bluetooth one is not in there, so I guess there really is no way to get the bluetooth MAC.

I am debating working on the assumption that the bluetooth MAC is (wlan0_MAC - 1), seems true for all my devices, but risky I'm sure.

Android Question MAC address Android 6

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