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;@Overrideprotected 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{@Overridepublic void onClick(View v) {ratingBar.setRating(ratingBar.getRating() + 1.0f);}}class RatingBarListener implements OnRatingBarChangeListener{@Overridepublic void onRatingChanged(RatingBar ratingBar, float rating, boolean fromUser) {System.out.println("rating:" + rating + ",fromUser:" + fromUser);}}@Overridepublic 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;}}