Android控件之RatingBar自定义星级评分样式

一、RatingBar简单介绍

RatingBar是基于SeekBar（拖动条）和ProgressBar（状态条）的扩展，用星形来显示等级评定，在使用默认RatingBar时，用户可以通过触摸/拖动/按键（比如遥控器）来设置评分， RatingBar自带有两种模式 ，一个小风格 ratingBarStyleSmall，大风格为ratingBarStyleIndicator，大的只适合做指示，不适用与用户交互。

效果图展示：

二、实例

1.布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:Android="Http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:paddingLeft="10dip"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RatingBar android:id="@+id/ratingbar1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:numStars="3"
android:rating="2.5" />
<RatingBar android:id="@+id/ratingbar2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:numStars="5"
android:rating="2.25" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dip">
<TextView android:id="@+id/rating"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<RatingBar android:id="@+id/small_ratingbar"
style="?android:attr/ratingBarStyleSmall"
android:layout_marginLeft="5dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical" />
</LinearLayout>
<RatingBar android:id="@+id/indicator_ratingbar"
style="?android:attr/ratingBarStyleIndicator"
android:layout_marginLeft="5dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical" />
</LinearLayout>

2.Java代码

package wjq.WidgetDemo;
import android.app.Activity;
import android.os.Bundle;
import android.widget.RatingBar;
import android.widget.TextView;
import android.widget.RatingBar.OnRatingBarChangeListener;
public class RatingBarDemo extends Activity implements
OnRatingBarChangeListener {
private RatingBar mSmallRatingBar;
private RatingBar mIndicatorRatingBar;
private TextView mRatingText;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.ratingbarpage);
mRatingText = (TextView) findViewById(R.id.rating);
// We copy the most recently changed rating on to these indicator-only
// rating bars
mIndicatorRatingBar = (RatingBar) findViewById(R.id.indicator_ratingbar);
mSmallRatingBar = (RatingBar) findViewById(R.id.small_ratingbar);
// The different rating bars in the layout. Assign the listener to us.
((RatingBar)findViewById(R.id.ratingbar1)).setOnRatingBarChangeListener(this);
((RatingBar)findViewById(R.id.ratingbar2)).setOnRatingBarChangeListener(this);
}
@Override
public void onRatinGChanged(RatingBar ratingBar, float rating,
boolean fromUser) {
final int numStars = ratingBar.getNumStars();
mRatingText.setText( 
" 受欢迎度" + rating + "/" + numStars);
// Since this rating bar is updated to reflect any of the other rating
// bars, we should update it to the current values.
if (mIndicatorRatingBar.getNumStars() != numStars) {
mIndicatorRatingBar.setNumStars(numStars);
mSmallRatingBar.setNumStars(numStars);
}
if (mIndicatorRatingBar.getRating() != rating) {
mIndicatorRatingBar.setRating(rating);
mSmallRatingBar.setRating(rating);
}
final float ratingBarStepSize = ratingBar.getStepSize();
if (mIndicatorRatingBar.getStepSize() != ratingBarStepSize) {
mIndicatorRatingBar.setStepSize(ratingBarStepSize);
mSmallRatingBar.setStepSize(ratingBarStepSize);
}
}
}

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