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문자

ImageButton

农民伯伯

版本:Android 2.2

 

java.lang.Object

android.view.View

android.widget.ImageView

android.widget.ImageButton

 

直接子类:

ZoomButton 

 

类摘要:

显示一个可以被用户点击的图片按钮,默认情况下,ImageButton看起来像一个普通的按钮,在不同状态(如按下)下改变背景颜色。按钮的图片可用通过<ImageButton> XML元素的android:src属性或setImageResource(int)方法指定。

要删除按钮的背景,可以定义自己的背景图片或设置背景为透明。(注:请看

原图和图片按钮,默认图片周围有按钮的背景,选中之后为黄色)

为了表示不同的按钮状态(焦点,选择等),你可以为各种状态定义不同的图片。例如,定义蓝色图片为默认图片,黄色图片为获取时焦点时显示的图片,黄色图片为按钮被按下时显示的图片。一个简单的方法可以做到这点——通过XML"selector."配置,如下:

保存上面的XMLres/drawable/文件夹下(注:注意文件名大小写!),将该文件名作为一个参数设置到ImageButton android:src属性(注:如xml文件名为myselector.xml,那么这里设置为"@drawable/myselector",设置android:background也是可以的,但效果不太一样)。Android根据按钮的状态改变会自动的去XML中查找相应的图片以显示。

<item>元素的顺序很重要,因为是根据这个顺序判断是否适用于当前按钮状态,这也是为什么正常(默认)状态指定的图片放在最后,是因为它只会在pressedfocused都判断失败之后才会被采用。(注:例如按钮被按下时是同时获得焦点的,但是获得焦点并不一定按了按钮,所以这里会按顺序查找,找到合适的就不往下找了。这里按钮被点击了,那么第一个将被选中,且不再在后面查找其他状态。)

参见Form Stuff tutorial

 

 

继承自父类的方法

         public void  setAlpha  (int alpha)

设置ImageButton图片的透明度(注意不是背景图片的)。效果如图:

         参数

                   alpha 透明值0~2550为完全透明,255为完全不透明


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