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
<"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" 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" 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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