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RadioButton

農民伯伯

版本：Android 2.2 r1

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public class RadioButton extends CompoundButton

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java.lang.Object

android.view.View

? ???? android.widget.TextView

android.widget.Button

android.widget.CompoundButton

android.widget.RadioButton

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概述

????????

???????? 單選按鈕是一種雙狀態(tài)的按鈕，可以選擇或不選中。在單選按鈕沒有被選中時，用戶能夠按下或點擊來選中它。但是，與復選框相反，用戶一旦選中就不能夠取消選中（譯者注：可以通過代碼來控制，界面上點擊的效果是一旦選中之后就不能取消選中了）。

???????? 多個單選按鈕通常與RadioGroup同時使用。當一個單選組（RadioGroup）包含幾個單選按鈕時，選中其中一個的同時將取消其它選中的單選按鈕。（譯者注：示例參見這里）

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公共方法???????

???????? public void toggle ()

???????? 將單選按鈕更改為與當前選中狀態(tài)相反的狀態(tài)。

???????? 如果這個單選按鈕已經(jīng)選中，這個方法將不切換單選按鈕。（譯者注：請看源碼：

）
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