How to get MAC Address of device using Wifi in Android

Question

I want to access MAC Address of phone using Wifi. but somehow I could not get it right. I have written following code.

context=this;
        setContentView(R.layout.activity_main);
        try{    
            WifiManager wifi=(WifiManager)this.context.getSystemService(context.WIFI_SERVICE);
            wifi.setWifiEnabled(true);
            WifiInfo info=wifi.getConnectionInfo();
            String address=info.getMacAddress();
            if(address==null){
                Toast.makeText(context, "Null", Toast.LENGTH_LONG).show();
            }
            else{
                new AsyncClass(MainActivity.this,address).execute();
            }
        }catch(Exception e){
            Toast.makeText(context, e.toString(), Toast.LENGTH_LONG).show();
        }

When I run this on my phone, it give me error that "Unfortunately Application Stopped" When I run this program on Imulator, it always gives address is Null. Please help me to get rid of it. Thanks in advance.

My Manifest file is as below:

<uses-permission
        android:required="true"
        android:name="android.permission.ACCESS_WIFI_STATE"/>
    <uses-permission
        android:required="true"
        android:name="android.permission.CHANGE_WIFI_STATE"/>
    <uses-permission
        android:required="true"
        android:name="android.permission.INTERNET"/>

ok, post it in the question, and also **post the error log in the question**. — Lucifer, Apr 23 '14 at 04:16
possible duplicate of [How to get MAC ADDRESS device in android](http://stackoverflow.com/questions/11705906/how-to-get-mac-address-device-in-android) and http://stackoverflow.com/questions/10831578/how-to-find-mac-address-of-an-android-device-programatically and http://stackoverflow.com/questions/2601124/how-to-obtain-mac-address-of-wifi-network-interface — WIllJBD, Apr 23 '14 at 04:36
I posted here working solution https://stackoverflow.com/a/47789324/5330408 — Android Developer, Dec 13 '17 at 12:11

score 1 · Answer 1 · edited Apr 23 '14 at 04:40

1

Please add a permission at manifest as follows

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

write a functin/method retrieveMacAddress as follows

public String retrieveMacAddress(Context context) {
    WifiManager wimanager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
    String macAddress = wimanager.getConnectionInfo().getMacAddress();
    if (macAddress == null) {
        macAddress = "Device don't have mac address or wi-fi is disabled";
    }
    return macAddress;
}

edited Apr 23 '14 at 04:40

Bhavin Nattar

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answered Apr 23 '14 at 04:27

Jitesh Upadhyay

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1

The code here appears to be drawn from this answer: http://stackoverflow.com/a/15203979/19679 . If so, that should probably be attributed to them. – Brad Larson May 22 '14 at 20:59

score 0 · Accepted Answer · edited Apr 23 '14 at 04:25

0

Your code is working properly,just remove asyncTask Line and put Toast message. Then your code will run on device.its working properly. I have checked your code.i think you have to get error in async task.

try {
            WifiManager wifi = (WifiManager) this
                    .getSystemService(this.WIFI_SERVICE);
            wifi.setWifiEnabled(true);
            WifiInfo info = wifi.getConnectionInfo();
            String address = info.getMacAddress();
            if (address == null) {
                Toast.makeText(this, "Null", Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(this, address, Toast.LENGTH_LONG).show();
            }
        } catch (Exception e) {
            Toast.makeText(this, e.toString(), Toast.LENGTH_LONG).show();
        }

edited Apr 23 '14 at 04:25

Lucifer

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answered Apr 23 '14 at 04:22

dipali

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Now I want to send this MAC address to the server using JSOn. so I have to send through AsyncTask. So what can I do for it? – Dhrupad Bhatt Apr 23 '14 at 04:32
@DhrupadBhatt That is technically a new question, and one that has already been answered before on SO, if this is the correct answer, which you have said it is, (and I will verify it is) you need to accept it. Even the original question is a duplicate. – WIllJBD Apr 23 '14 at 04:33
wait i will give one method..if this answer is helpful then please upvote it. – dipali Apr 23 '14 at 04:34
@DhrupadBhatt chk my second answer – dipali Apr 23 '14 at 04:42

score 0 · Answer 3 · edited Apr 23 '14 at 04:43

0

public void uploadMacAddressTOserver(String address) {
        new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    CallWebserviceToUploadMacAddress(address);
                } catch (IOException e) {

                }

            }
        }).start();
    }

You can use thread and upload your data to server. May be in AsyncTask some you have to pass some wrong parameter so it gives error.

edited Apr 23 '14 at 04:43

Lucifer

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answered Apr 23 '14 at 04:41

dipali

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Ok I am trying this suggestion. – Dhrupad Bhatt Apr 23 '14 at 04:45

score 0 · Answer 4 · edited Dec 30 '21 at 08:12

This is my code and works well in android 5 +.

public static String getMacAddress() {
    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) + ":");
                res1.append(String.format("%02X:",b));
            }
            if (res1.length() > 0) {
                res1.deleteCharAt(res1.length() - 1);
            }
            return res1.toString();
        }
    } catch (Exception ex) {
        //handle exception
    }
    return "";
}

How to get MAC Address of device using Wifi in Android

4 Answers4