سورس کد بررسی ارتباط اینترنت در اندروید

package ir.cristiansoft.checkinternet;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    Button btnCheckInternet;

    Context context;
    ConnectivityManager conMgr;
    NetworkInfo networkInfo;

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

        context = getApplicationContext();
        conMgr = (ConnectivityManager) context.getSystemService(CONNECTIVITY_SERVICE);
        networkInfo = conMgr.getActiveNetworkInfo();
		
        btnCheckInternet = (Button) findViewById(R.id.button_checkinternet);
		
        btnCheckInternet.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if ( networkInfo == null || !networkInfo.isAvailable() || !networkInfo.isConnected() )
                {
                    Toast.makeText(context , "Disconnected !!!!!!" , Toast.LENGTH_LONG).show();
                }
                else
                {
                    Toast.makeText(context , "Connected !" , Toast.LENGTH_LONG).show();
                }

            }
        });

    }
}