RatingBar是Adnroid中的評分條。效果挺得的

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源碼下載

一、概述

　　　　RatingBar是SeekBar和ProgressBar的擴展，用星星來評級。使用的默認大小RatingBar時，用戶可以觸摸/拖動或使用鍵來設置評分，它有倆種樣式（大、小），其中大的只適合指示，不適合于用戶交互。

二、實例

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代碼

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(
????????????????? " 受歡迎度" + 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);
???????? }

?}

}

總結

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