·         Start a new project, named RatingBarDemo.

·         Open res/layout/main.xml and add a RatingBar widget inside the linear layout.

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

     android:orientation="vertical"

     android:layout_width="fill_parent"

     android:layout_height="fill_parent">

     <RatingBar android:id="@+id/ratingbar"

                  android:layout_width="wrap_content"

                  android:layout_height="wrap_content"

                  android:numStars="5"

                  android:stepSize="1.0" />

</LinearLayout>

·         Now we have to show the new rating to the user by using toast message. To do this add the following code in the activity:

import android.app.Activity;

import android.os.Bundle;

import android.widget.RatingBar;

import android.widget.Toast;

import android.widget.RatingBar.OnRatingBarChangeListener;

  

public class RatingBarActivity  extends Activity {

    

     @Override

     public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.main);

         final RatingBar ratingbar = (RatingBar) findViewById(R.id.ratingbar);

         ratingbar.setOnRatingBarChangeListener(new OnRatingBarChangeListener() {

                     

                      public void onRatingChanged(RatingBar ratingBar,  float rating,

                                                                boolean fromUser) {

                           

                           Toast.makeText(RatingBarActivity.this,  "New Rating:  

                                            "

                                           "+rating, Toast.LENGTH_SHORT).show();

                     }

              });

    }

}

The above code captures the RatingBar widget from the layout with findViewById(int) and then sets an RatingBar.OnRatingBarChangeListener. The onRatingChanged()callback method then defines the action to perform when the user sets a rating. In this case, a simple Toast message displays the new rating.

·         Run the application

You output look something like this:

When users select a new rating, a rating will be displayed in the toast message.