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
01 <selectorxmlns:android="http://schemas.android.com/apk/res/android">
02
03<item android:state_window_focused="false"
04android:drawable="@color/transparent"/>
05
06<!-- 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-->
07
08
09<item android:state_focused="true" android:state_enabled="false"
10android:state_pressed="true"
11android:drawable="@drawable/selector_background_disabled"/>
12<item android:state_focused="true" android:state_enabled="false"
13android:drawable="@drawable/lselector_background_disabled"/>
14
15<item android:state_focused="true" android:state_pressed="true"
16android:drawable="@drawable/selector_background_transition"/>
17<item android:state_focused="false" android:state_pressed="true"
18android:drawable="@drawable/selector_background_transition"/>
19
20<item android:state_focused="true"
21android:drawable="@drawable/selector_background_focus"/>
22
23 </selector>
2。在构造layout是引用这个xml
1 <ImageButton
2android:id="@+id/ImageButton01"
3android:layout_width="wrap_content"
4android:layout_height="wrap_content"
5android:background="@drawable/mybutton">
6 </ImageButton>
这样就ok拉