Android rating bar

import android.os.Bundle;

import android.app.Activity;

import android.view.View.OnClickListener;

import android.view.*;

import android.widget.Button; 

import android.widget.RatingBar; 

import android.widget.Toast; 

public class MainActivity extends Activity {

RatingBar r1;

Button b1;

       @Override

       protected void onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              setContentView(R.layout.activity_main);

              addListenerOnButtonClick(); 

       }

        public void addListenerOnButtonClick(){ 

               r1=(RatingBar)findViewById(R.id.ratingBar1); 

               b1=(Button)findViewById(R.id.button1); 

               //Performing action on Button Click 

               b1.setOnClickListener(new OnClickListener(){ 

        

                   @Override 

                   public void onClick(View arg0) { 

                       //Getting the rating and displaying it on the toast 

                       String rating=String.valueOf(r1.getRating()); 

                       Toast.makeText(getApplicationContext(), rating, Toast.LENGTH_LONG).show(); 

                   } 

                    

               }); 

           } 

}