Android入门之RatingBar（评分）

效果图：

<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>

package com.jkxqj.helloandroid;

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;
	}

}