Selector tag in android -


i working on home screen application, trying changes existing one. downloaded code mydroid folder. , when analyzing found used selector tag in xml file, couldn't understand used achieve functionality.

<selector xmlns:android="http://schemas.android.com/apk/res/android">     <item android:state_checked="false" android:drawable="@drawable/ic_launcher_allshow" />     <item android:state_checked="true" android:drawable="@drawable/ic_launcher_allhide" /> </selector>

it present in res/drawable folder.

a selector tag looks state of ui @ time , displays appropriate image.

this particular drawable check box, when checkbox in state

 android:state_checked="false"

(i.e. when checkbox not checked)

it uses image:

 @drawable/ic_launcher_allshow

therefore , checked:

 android:state_checked="true"

uses

 @drawable/ic_launcher_allhide

see here:

http://developer.android.com/guide/topics/resources/drawable-resource.html#statelist

&

http://developer.android.com/reference/android/graphics/drawable/statelistdrawable.html


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