Detailed explanation of the usage of RatingBar control in Android

package .mars_2500_ratingbar;

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public class MainActivity extends Activity
{

  RatingBar ratingBar;
  Button button1;
  public static String TAG="MainActivity";
  @Override
  protected void onCreate(Bundle savedInstanceState)
  {
    (savedInstanceState);
    setContentView(.activity_main);
    ratingBar=(RatingBar)findViewById(.ratingBar1);
    (new RatingBarChangeListener());
    button1=(Button)findViewById(.buttn1);
    (new ClickListener());
    
  }

  class RatingBarChangeListener implements OnRatingBarChangeListener
  {
    @Override
    public void onRatingChanged(RatingBar ratingBar, float rating,
        boolean fromUser)
    {
      (TAG, "Current score="+rating);
      ("Current score="+rating);
    }
  }
  
  class ClickListener implements OnClickListener
  {
    @Override
    public void onClick(View v)
    {  //Add 0.5 points to the current      (()+0.5f);
    }
  }
  
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu)
  {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(, menu);
    return true;
  }

}

<?xml version="1.0" encoding="UTF-8"?>
 <LinearLayout xmlns:andro
     android:orientation="vertical"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     >
 
<RatingBar 
    android:
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:numStars="5"
    android:stepSize="0.5"
    />
  <Button 
    android:
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@id/ratingBar1"
    android:text="score"
     />
 </LinearLayout>