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;
    }

}