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RatingBar ?

翻譯人:wallace2010/ madgoat

譯者博客:http://madgoat.cn/

http://blog.csdn.net/springiscoming2008

版本:Android 2.2 r1

?

public class RatingBar extends AbsSeekBar

?

java.lang.Object

???????? android.view.View

? ????????????? android.widget.ProgressBar

? ???? ??????????????? android.widget.AbsSeekBar

? ???? ?????? ??????????????? android.widget.RatingBar

?

類概述

說明: C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\_T0)`TREGPTYW8572GPI3FW.jpg

RatingBar是基于SeekBarProgressBar的擴(kuò)展,用星型來顯示等級評定。使用RatingBar的默認(rèn)大小時,用戶可以觸摸/拖動或使用鍵來設(shè)置評分,它有兩種樣式(小風(fēng)格用ratingBarStyleSmall,大風(fēng)格用ratingBarStyleIndicator),其中大的只適合指示,不適合于用戶交互。

當(dāng)使用可以支持用戶交互的RatingBar時,無論將控件(widgets)放在它的左邊還是右邊都是不合適的。

只有當(dāng)布局的寬被設(shè)置為wrap? content時,設(shè)置的星星數(shù)量(通過函數(shù)setNumStars(int)或者在XML的布局文件中定義)將顯示出來(如果設(shè)置為另一種布局寬的話,后果無法預(yù)知)。

次級進(jìn)度一般不應(yīng)該被修改,因為他僅僅是被當(dāng)作星型部分內(nèi)部的填充背景。

參見Form Stuff tutorial.

?

嵌套類

接口:RatingBar.OnRatingBarChangeListener

一個回調(diào)函數(shù),當(dāng)星級進(jìn)度改變時修改客戶端的星級。

?

XML屬性

屬性名稱

描述

android:isIndicator

RatingBar是否是一個指示器(用戶無法進(jìn)行更改)

android:numStars

顯示的星型數(shù)量,必須是一個整形值,像“100”。

android:rating

默認(rèn)的評分,必須是浮點(diǎn)類型,像“1.2”。

android:stepSize

評分的步長,必須是浮點(diǎn)類型,像“1.2”。

?

公共方法???????

???????? public int getNumStars ()

返回顯示的星型數(shù)量

返回值

??????????????????????????? 顯示的星型數(shù)量

?

public RatingBar.OnRatingBarChangeListener getOnRatingBarChangeListener ()

返回值

監(jiān)聽器(可能為空)監(jiān)聽評分改變事件

?

public float getRating ()

獲取當(dāng)前的評分(填充的星型的數(shù)量)

返回值

當(dāng)前的評分

?

public float getStepSize ()

獲取評分條的步長

返回值

The step size.

步長

?

public boolean isIndicator ()

返回值

??????????????????????????? 判斷當(dāng)前的評分條是否僅僅是一個指示器(注:即能否被修改)

?

public void setIsIndicator (boolean isIndicator)

設(shè)置當(dāng)前的評分條是否僅僅是一個指示器(這樣用戶就不能進(jìn)行修改操作了)

參數(shù)

isIndicator ????? Bool值,是否是一個指示器

?

public synchronized void setMax (int max)

設(shè)置評分等級的范圍,從0max

參數(shù)

max ??????? 評分條最大范圍。

?

public void setNumStars (int numStars)

設(shè)置顯示的星型的數(shù)量。為了能夠正常顯示它們,建議將當(dāng)前widget的布局寬度設(shè)置為wrap content

參數(shù)

numStars ??????? 星型的數(shù)量

?

public void setOnRatingBarChangeListener (RatingBar.OnRatingBarChangeListener listener)

設(shè)置當(dāng)評分等級發(fā)生改變時回調(diào)的監(jiān)聽器

參數(shù)

listener ? 監(jiān)聽器

?

public void setRating (float rating)

設(shè)置分?jǐn)?shù)(星型的數(shù)量)

參數(shù)

rating ???? 設(shè)置的分?jǐn)?shù)

?

public void setStepSize (float stepSize)

設(shè)置當(dāng)前評分條的步長(step size

參數(shù)

stepSize 評分條的步進(jìn)。例如:如果想要半個星星,它的值為0.5。

?

受保護(hù)方法

protected synchronized void onMeasure (int widthMeasureSpec, int heightMeasureSpec)

權(quán)衡 view content 來決定它的寬度和高度的整齊。它被measure(int, int) 調(diào)用 并且應(yīng)該被子類所覆蓋,以便提供準(zhǔn)確高效的布局測量。

規(guī)定: 當(dāng)覆蓋這個方法的時候,你必須調(diào)用 setMeasuredDimension(int, int)以便存儲精確的視圖的寬和高。如果不這樣做的話將觸發(fā)llegalStateException異常,被函數(shù) measure(int, int)拋出。調(diào)用父類 onMeasure(int, int)是合理的。

尺寸的基本類的實現(xiàn)默認(rèn)是背景大小,除非通過MeasureSpec允許大的尺寸。子類應(yīng)該覆蓋 onMeasure(int, int) 以便提供更好的布局大小。

如果這個方法被覆蓋,子類應(yīng)該負(fù)責(zé)確保標(biāo)準(zhǔn)的寬和高至少是視圖的最小寬度和高度的值(分別為getSuggestedMinimumHeight() getSuggestedMinimumWidth()兩方法)。

參數(shù)

?????? widthMeasureSpec???? 受主窗口支配的水平空間要求。這個需求通過 View.MeasureSpec.進(jìn)行編碼。

?????? heightMeasureSpec?? 受主窗口支配的垂直空間要求。這個需求通過 View.MeasureSpec.進(jìn)行編碼。

?

補(bǔ)充

???????? 文章鏈接

?????????????????? Android 控件之RatingBar評分條

?????????????????? Android更換RatingBar圖片

?????????????????? [Android學(xué)習(xí)指南]RatingBar 評分條

???????? 示例代碼( 代碼轉(zhuǎn)載自Android手機(jī)開發(fā)者論壇

AndroidRatingBar.java

public class AndroidRatingBar extends Activity {

??

?? @Override

?? public void onCreate(Bundle savedInstanceState) {

?????? super.onCreate(savedInstanceState);

?????? setContentView(R.layout.main);

?

?????? final RatingBar ratingBar_Small = (RatingBar)findViewById(R.id.ratingbar_Small);

?????? final RatingBar ratingBar_Indicator = (RatingBar)findViewById(R.id.ratingbar_Indicator);

?????? final RatingBar ratingBar_default = (RatingBar)findViewById(R.id.ratingbar_default);

?

?????? ratingBar_default.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener(){

?

?? public void onRatingChanged(RatingBar ratingBar, float rating,

???? boolean fromUser) {

??? ratingBar_Small.setRating(rating);

??? ratingBar_Indicator.setRating(rating);

??? Toast.makeText(AndroidRatingBar.this, "rating:"+String.valueOf(rating),

????? Toast.LENGTH_LONG).show();

?? }});

?? }

}

main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

?? android:orientation="vertical"

?? android:layout_width="fill_parent"

?? android:layout_height="fill_parent"

?? >

<TextView

?? android:layout_width="fill_parent"

?? android:layout_height="wrap_content"

?? android:text="@string/hello"

?? />

<RatingBar

?? android:layout_width="wrap_content"

?? android:layout_height="wrap_content"

?? style="?android:attr/ratingBarStyleIndicator"

?? android:id="@+id/ratingbar_Indicator"

?? />

<RatingBar

?? android:layout_width="wrap_content"

?? android:layout_height="wrap_content"

?? style="?android:attr/ratingBarStyleSmall"

?? android:id="@+id/ratingbar_Small"

?? android:numStars="20"

?? />

<RatingBar

?? android:layout_width="wrap_content"

?? android:layout_height="wrap_content"

?? style="?android:attr/ratingBarStyle"

?? android:id="@+id/ratingbar_default"

?? />

</LinearLayout>


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