ANDROID_MARS学习笔记_S01_012_RatingBar

1.xml

 <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"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context=".MainActivity" >

     <RatingBar
         android:id="@+id/firstRatingBar"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:numStars="4"
         android:stepSize="1"
          />

     <Button
         android:id="@+id/button"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_below="@id/firstRatingBar"
         android:text="button"/>

 </RelativeLayout>

2.java

 package com.marschen.s01e_e18_ratingbar;

 import android.app.Activity;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.RatingBar;
 import android.widget.RatingBar.OnRatingBarChangeListener;

 public class MainActivity extends Activity {

     private RatingBar ratingBar;
     private Button button;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         ratingBar = (RatingBar)findViewById(R.id.firstRatingBar);
         button = (Button)findViewById(R.id.button);

         RatingBarListener listener = new RatingBarListener();
         ratingBar.setOnRatingBarChangeListener(listener);

         ButtonListener buttonListener = new ButtonListener();
         button.setOnClickListener(buttonListener);
     }

     class ButtonListener implements OnClickListener{

         @Override
         public void onClick(View v) {
             ratingBar.setRating(ratingBar.getRating() + 1.0f);
         }

     }

     class RatingBarListener implements OnRatingBarChangeListener{

         @Override
         public void onRatingChanged(RatingBar ratingBar, float rating, boolean fromUser) {
             System.out.println("rating:" + rating + ",fromUser:" + fromUser);
         }

     }
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.
         getMenuInflater().inflate(R.menu.main, menu);
         return true;
     }

 }