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문자


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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