这code是的RatingBar状态，当我们开始新的活动，你会看到previous等级状态存储有用..

This code is useful for store the ratingbar state, when we start new activity, you will see the previous rating state..

package com.example.ratingbar;

import android.os.Bundle;
import android.preference.PreferenceManager;
import android.app.Activity;
import android.content.SharedPreferences;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.RatingBar;
import android.widget.RatingBar.OnRatingBarChangeListener;
import android.widget.TextView;
import android.widget.Toast;

public class RatingbarMainActivity extends Activity {

RatingBar ratingbarClick;
Button sub_btn;
TextView textRatingView , textRatingViewSave;
Boolean val = true;
float ans = (float) 0.0;
//--------------------------------------------------------------------------------------------
@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_ratingbar_main);

    ratingbarClick = (RatingBar) findViewById(R.id.ratingBar1);
    ratingbarClick.setOnRatingBarChangeListener(rateObj);


    SharedPreferences sharePref = PreferenceManager.getDefaultSharedPreferences
             (RatingbarMainActivity.this);

    ans = sharePref.getFloat("Get_Rating", 0.0f);
    System.out.println("--------------------------------------ans = " + ans);
    if(val) {
        ratingbarClick.setRating(ans);
    }
    else {
        ratingbarClick.setRating(ans);
    }

    textRatingView = (TextView) findViewById(R.id.ratingView);


}

//--------------------------------------------------------------------------------------------
//--------------------------------------------------------------------------------------------

    RatingBar.OnRatingBarChangeListener rateObj = new RatingBar.OnRatingBarChangeListener() {

        @Override
        public void onRatingChanged(RatingBar ratingBar, float rating,boolean fromUser) {

            //textRatingView.setText(String.valueOf(rating));
            ans = ratingbarClick.getRating();

            SharedPreferences sharePref = PreferenceManager.getDefaultSharedPreferences
                            (RatingbarMainActivity.this);
            SharedPreferences.Editor edit = sharePref.edit();
            edit.putFloat("Get_Rating", ans);
            edit.commit();
            val = false;

        }
    };


//--------------------------------------------------------------------------------------------

    }

---------------------------------------------------------------------------------------------------
    activity_ratingbar_main.xml file 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/ratingBar1"
    android:layout_alignParentTop="true"
    android:layout_marginLeft="15dp"
    android:layout_marginTop="23dp"
    android:text="Select Your Rating Bar Here"
    tools:context=".RatingbarMainActivity" />

<RatingBar
    android:id="@+id/ratingBar1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:layout_marginLeft="21dp"
    android:layout_marginTop="63dp" />


<TextView
    android:id="@+id/ratingView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/ratingBar1"
    android:text="TextView" />

<Button
    android:id="@+id/button1"
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_centerVertical="true"
    android:text="Click To Save Rating In TextBox" />

 </RelativeLayout>