Android中 RatingBar评分条的使用

  一、概述

                RatingBar是SeekBar和ProgressBar的扩展，用星星来评级。使用的默认大小RatingBar时，用户可以触摸/拖动或使用键来设置评分，它有俩种样式（大、小），其中大的只适合指示，不适合于用户交互。

<?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" />  

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);   }     }     }