check intenet android

package com.example.checkintenet;

import android.app.Activity;
import android.content.Context;
import android.net.ConnectivityManager;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends Activity {

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

    public void checkNetworkStatus() {

        final ConnectivityManager connMgr = (ConnectivityManager) this
                .getSystemService(Context.CONNECTIVITY_SERVICE);

        final android.net.NetworkInfo wifi = connMgr
                .getNetworkInfo(ConnectivityManager.TYPE_WIFI);

        final android.net.NetworkInfo mobile = connMgr
                .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

        if (wifi.isAvailable()) {

            Toast.makeText(this, "Wifi", Toast.LENGTH_LONG).show();
        } else if (mobile.isAvailable()) {

            Toast.makeText(this, "Mobile 3G ", Toast.LENGTH_LONG).show();
        } else {

            Toast.makeText(this, "No Network ", Toast.LENGTH_LONG).show();
        }

    }
}