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;
/*
* (non-javadoc)
* 
* @see android.app.activity#oncreate(android.os.bundle)
*/
@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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