[android-developers] How to find Ip address of a device via wifi?

I wanna get IP address. Using that Ip address must detect overall devices which is connected to a specific network/device.And should be able to get MAC address ? 

Please can anyone help me here ?

This is my code :

 tv=(TextView)findViewById(R.id.tv);   wifi=(WifiManager)getSystemService(WIFI_SERVICE) ;   btn=(Button)findViewById(R.id.btn);   btn.setOnClickListener(new View.OnClickListener() {   @Override   public void onClick(View v) {   try {   InetAddress inet=InetAddress.getLocalHost();   Toast.makeText(getApplicationContext(),inet.toString(),Toast.LENGTH_LONG).show();   } catch (Exception e) {   System.out.println(" ");      }

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