Expandable list-view android, set custom drawables

ok, i just ha开发者_StackOverflow社区ve a simple question here. how can i change the group arrow on expandable listview with another drawables? y know, i'm gonna use + and - for my expandable group list...

Thanks

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Please check this link more helpful to you

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OR

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<ExpandableListView
    android:id="@+id/android:list"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:groupIndicator="@drawable/group_indicator" >

group_indicator.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_empty="true" android:drawable="@drawable/arrowright"></item>
    <item android:state_expanded="true" android:drawable="@drawable/arrowdown"></item>
    <item android:drawable="@drawable/arrowright"></item>
</selector>