How to update WiFi state using BroadcastReceiver

This BroadcastReceiver will trigger anytime "Mobile data" disconnects or connects.

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

TextView wifistate = (TextView) findViewById(R.id.infowifi);

this.registerReceiver(mWifiStateChangedReceiver,new IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION));

}

@Override
public void onBackPressed() {
    
    unregisterReceiver(mWifiStateChangedReceiver); // this will unregister Receiver
    this.finish(); // this will finish ThisActivity
    super.onBackPressed();
}

private BroadcastReceiver mWifiStateChangedReceiver = new BroadcastReceiver()
{

    @Override    public void onReceive(Context context, Intent intent)
    {
        // TODO Auto-generated method stub
        int extraWifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_UNKNOWN);
        doit();
        switch (extraWifiState)
        {
            case WifiManager.WIFI_STATE_DISABLED: // wifi is disabled
                wifistate.setText("OFF"); // do whatever you want here
                break;
            case WifiManager.WIFI_STATE_DISABLING: // wifi is in process of disabling
                wifistate.setText("OFF"); // do whatever you want here
                break;
            case WifiManager.WIFI_STATE_ENABLED: // wifi is enabled
                wifistate.setText("ON"); // do whatever you want here
                break;
            case WifiManager.WIFI_STATE_ENABLING: // wifi is in process of enabling
                wifistate.setText("ON"); // do whatever you want here
                break;
            case WifiManager.WIFI_STATE_UNKNOWN: // wifi state is unknown
                wifistate.setText("N/A"); // do whatever you want here
                break;
        }

    }
};
}