Android's Ratingbar control usage _android

Mainactivity.java

Package Com.example.mars_2500_ratingbar;
Import android.support.v7.app.ActionBarActivity;
Import Android.support.v7.app.ActionBar;
Import android.support.v4.app.Fragment;
Import android.app.Activity;
Import Android.os.Bundle;
Import Android.util.Log;
Import Android.view.LayoutInflater;
Import Android.view.Menu;
Import Android.view.MenuItem;
Import Android.view.View;
Import Android.view.View.OnClickListener;
Import Android.view.ViewGroup;
Import Android.widget.Button;
Import Android.widget.RatingBar;
Import Android.widget.RatingBar.OnRatingBarChangeListener;

Import Android.os.Build;
  public class Mainactivity extends activity {Ratingbar Ratingbar;
  Button button1;
  public static String tag= "Mainactivity";
    @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);
    Setcontentview (R.layout.activity_main);
    Ratingbar= (Ratingbar) Findviewbyid (R.ID.RATINGBAR1); Ratingbar.setonratingbarchangelistener (New RatingbarchangelisteneR ());
    button1= (Button) Findviewbyid (R.ID.BUTTN1);
    
  Button1.setonclicklistener (New Clicklistener ()); Class Ratingbarchangelistener implements Onratingbarchangelistener {@Override public void onratingchanged (
      Ratingbar Ratingbar, Float rating, Boolean fromuser) {log.i (TAG, "Current score =" +rating);
    System.out.println ("Current score =" +rating); Class Clicklistener implements Onclicklistener {@Override public void OnClick (View v) {//on current plus 0
    .5 min. ratingbar.setrating (ratingbar.getrating () +0.5f); }} @Override public boolean Oncreateoptionsmenu (Menu menu) {//Inflate the menu; this adds items to th
    E Action Bar if it is present.
    Getmenuinflater (). Inflate (R.menu.main, menu);
  return true; }

}

Activity_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"
     >
 
<ratingbar 
    android:id= "@+id/ratingbar1"
    Wrap_content "
    android:layout_height=" wrap_content "
    android:numstars=" 5 "
    android:stepsize=" 0.5 "
    />
  <button 
    android:id= "@+id/buttn1"
    android:layout_width= "Wrap_content"
    android:layout_height= "Wrap_content"
    android:layout_below= "@id/ratingbar1"
    android:text= "score"
     / >
 </LinearLayout>

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