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android中使用selector动态改变imageView或ImageViewButton的背景

2011-06-25 103hotness 0likes 0comments

做应用时,可能会需要动态改变控件的背景图片,如果仅仅是简单的点击,选中之类的事件,如果靠程序中写监听的代码就显得太麻烦了,在这种情况下,你可以使用selector动态改变控件背景拉:)


1。在res/drawable目录下建一个mybutton.xml文件,根据需要,不同的状态下建立不同的item,并对应相应的图片


<selector xmlns:android="http://schemas.android.com/apk/res/android">


    <item android:state_window_focused="false"
        android:drawable="@color/transparent" />


    <!-- Even though these two point to the same resource, have two states so the drawable will invalidate itself when coming out of pressed state. 注意这句话-->



    <item android:state_focused="true" android:state_enabled="false"
        android:state_pressed="true"
        android:drawable="@drawable/selector_background_disabled" />
    <item android:state_focused="true" android:state_enabled="false"
        android:drawable="@drawable/lselector_background_disabled" />


    <item android:state_focused="true" android:state_pressed="true"
        android:drawable="@drawable/selector_background_transition" />
    <item android:state_focused="false" android:state_pressed="true"
        android:drawable="@drawable/selector_background_transition" />


    <item android:state_focused="true"
        android:drawable="@drawable/selector_background_focus" />


</selector>


2。在构造layout是引用这个xml


<ImageButton
android:id="@+id/ImageButton01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/mybutton">
</ImageButton>


这样就ok拉

Tag: Nothing
Last updated:2011-06-25

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