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RadioButton

农民伯伯

版本：Android 2.2 r1

 

public class RadioButton extends CompoundButton

 

java.lang.Object

android.view.View

       android.widget.TextView

android.widget.Button

android.widget.CompoundButton

android.widget.RadioButton

 

概述

        

         单选按钮是一种双状态的按钮，可以选择或不选中。在单选按钮没有被选中时，用户能够按下或点击来选中它。但是，与复选框相反，用户一旦选中就不能够取消选中（译者注：可以通过代码来控制，界面上点击的效果是一旦选中之后就不能取消选中了）。

         多个单选按钮通常与RadioGroup同时使用。当一个单选组（RadioGroup）包含几个单选按钮时，选中其中一个的同时将取消其它选中的单选按钮。（译者注：示例参见这里）

 

公共方法       

         public void toggle ()

         将单选按钮更改为与当前选中状态相反的状态。

         如果这个单选按钮已经选中，这个方法将不切换单选按钮。（译者注：请看源码：

）
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