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"/>

Answer 1

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();
        }