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();
 }

 }
 });

 }
}