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문자


Button

农民伯伯

版本:Android 2.2 r1

 

public class Button extends TextView

 

java.lang.Object

android.view.View

       android.widget.TextView

              android.widget.Button

 

直接子类

         CompoundButton

 

间接子类

         CheckBox, RadioButton, ToggleButton

 

概述

代表一个按钮部件。用户通过按下按钮,或者点击按钮来执行一个动作。以下是一个按钮在activity中典型的应用:

        

         然后,你能在xml布局中通过buttonandroid:onClick属性指定一个方法,以替代在activity中为button设置OnClickListener。例如:

        

         现在,当用户点击按钮时,Android系统调用activityselfDestruct(View)方法。为了正确执行,这个方法必须是public并且仅接受一个View类型的参数。例如

        

         方法的View参数是被点击部件的引用。

 

按钮样式

每个按钮的样式默认为系统按钮的背景,不同的设备、不同的平台版本有不同按钮风格。如你不满意默认的按钮样式,想对其定制以符合您应用程序的设计,那么你能用state list drawable替换按钮的背景图片。一个状态列表drawable是一个在XML中定义的drawable资源,根据当前按钮的状态改变其图片。一旦你在XML中定义了一个状态列表drawable,你可以将它应用于你的android:background属性。欲了解更多信息和示例,参见State List Drawable.

实现一个按钮的例子可参见Form Stuff tutorial

 

XML属性

         参见ButtonTextViewViewXML属性。


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