A RatingBar is an extension of SeekBar and ProgressBar that shows a rating in stars. The user can touch/drag or use arrow keys to set the rating when using the default size RatingBar. The smaller RatingBar style ( ratingBarStyleSmall) and the larger indicator-only style (ratingBarStyleIndicator) do not support user interaction and should only be used as indicators.

main.xml
 

<?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"
   >
<TextView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/hello"
   />
<RatingBar 
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   style="?android:attr/ratingBarStyleIndicator"
   android:id="@+id/ratingbar_Indicator"
   />
<RatingBar 
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   style="?android:attr/ratingBarStyleSmall"
   android:id="@+id/ratingbar_Small"
   android:numStars="20"
   />
<RatingBar 
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   style="?android:attr/ratingBarStyle"
   android:id="@+id/ratingbar_default"
   />
</LinearLayout>

package com.AndroidRatingBar;

import android.app.Activity;
import android.os.Bundle;
import android.widget.RatingBar;
import android.widget.Toast;

public class AndroidRatingBar extends Activity {
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
      
       final RatingBar ratingBar_Small = (RatingBar)findViewById(R.id.ratingbar_Small);
       final RatingBar ratingBar_Indicator = (RatingBar)findViewById(R.id.ratingbar_Indicator);
       final RatingBar ratingBar_default = (RatingBar)findViewById(R.id.ratingbar_default);
      
       ratingBar_default.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener(){

   @Override
   public void onRatingChanged(RatingBar ratingBar, float rating,
     boolean fromUser) {
    // TODO Auto-generated method stub
    ratingBar_Small.setRating(rating);
    ratingBar_Indicator.setRating(rating);
    Toast.makeText(AndroidRatingBar.this, "rating:"+String.valueOf(rating),
      Toast.LENGTH_LONG).show();
   }});
   }
}

Source: android-er

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