阅读《Android 从入门到精通》（19）——评分条

来源：互联网发布：分布式架构 java 编辑：程序博客网时间：2024/06/07 03:54

评分条（RatingBar）

java.lang.Object;
android.view.View;
android.widget.ProgressBar;
android.widget.AbsSeekBar;
android.widget.RatingBar;

RatingBar 类方法

RatingBar 示例

完整工程：http://download.csdn.net/detail/sweetloveft/9424271

下述程序，学习的是 Android 最后一个官方原有控件了，此后我们要学习布局，等整个 Android 应用学完之后，我们就要开始思考：为什么是是这样？如何设计自己的控件？自绘控件、派生控件、组合控件，以及前三者融合起来的控件？如果在学习控件的组成上自己实现 OO 思想？我们需要在整个 Android 应用学完后结合 DuiLib 去反思这些设计，制作自己的设计，一点点的深入底层！

1.MainActivity.java

package com.sweetlover.activity;import com.sweetlover.ratingbar.R;import android.app.Activity;import android.os.Bundle;import android.widget.RatingBar;import android.widget.RatingBar.OnRatingBarChangeListener;import android.widget.TextView;public class MainActivity extends Activity {private TextView[] textView = new TextView[3];private RatingBar[] ratingBar = new RatingBar[3];@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.activity_main);textView[0] = (TextView) findViewById(R.id.textView1);textView[1] = (TextView) findViewById(R.id.textView2);textView[2] = (TextView) findViewById(R.id.textView3);ratingBar[0] = (RatingBar) findViewById(R.id.ratingBar1);ratingBar[1] = (RatingBar) findViewById(R.id.ratingBar2);ratingBar[2] = (RatingBar) findViewById(R.id.ratingBar3);ratingBar[0].setOnRatingBarChangeListener(new OnRatingBarChangeListener() {@Overridepublic void onRatingChanged(RatingBar ratingBar, float rating,boolean fromUser) {// TODO Auto-generated method stubint numStars = ratingBar.getNumStars();float curNum = rating;textView[0].setText("总共 " + numStars + " 个星：" + curNum);}});ratingBar[1].setOnRatingBarChangeListener(new OnRatingBarChangeListener() {@Overridepublic void onRatingChanged(RatingBar ratingBar, float rating,boolean fromUser) {// TODO Auto-generated method stubint numStars = ratingBar.getNumStars();float curNum = rating;textView[1].setText("<span style="font-family: Arial, Helvetica, sans-serif;">总共</span> " + numStars + " 个星：" + curNum);}});ratingBar[2].setOnRatingBarChangeListener(new OnRatingBarChangeListener() {@Overridepublic void onRatingChanged(RatingBar ratingBar, float rating,boolean fromUser) {// TODO Auto-generated method stubint numStars = ratingBar.getNumStars();float curNum = rating;textView[2].setText("总共 " + numStars + " 个星：" + curNum);}});}}

2.activity_main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:padding="30dp" >    <RatingBar        android:id="@+id/ratingBar1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center" />    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:text=""        android:textAppearance="?android:attr/textAppearanceMedium" />    <RatingBar        android:id="@+id/ratingBar2"        style="android:ratingBarStyleIndicator"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center" />    <TextView        android:id="@+id/textView2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:text=""        android:textAppearance="?android:attr/textAppearanceMedium" />    <RatingBar        android:id="@+id/ratingBar3"        style="android:ratingBarStyleSmall"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center" />    <TextView        android:id="@+id/textView3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:text=""        android:textAppearance="?android:attr/textAppearanceMedium" /></LinearLayout>

3.AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.sweetlover.ratingbardemo"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="19" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity android:name="com.sweetlover.activity.MainActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN"/>                <category android:name="android.intent.category.LAUNCHER"/>            </intent-filter>        </activity>    </application></manifest>

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