android:change indicator icon and size of expandablelistview used for navigation

You can use the following code:

<ExpandableListView android:id="@+id/android:list"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    android:layout_marginTop="10dp"
    android:groupIndicator="@drawable/settings_selector" />

... where the setting_selector is:

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

<ExpandableListView android:id="@+id/android:list"
       android:layout_width="fill_parent" 
       android:layout_height="fill_parent"
       android:layout_marginTop="10dp"
       android:groupIndicator="@drawable/settings_selector"
   />

And

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
   <item android:drawable="@drawable/up_arrow" android:state_expanded="true"/>
   <item android:drawable="@drawable/down_arrow" android:state_expanded="false"/>
</selector>

He forgot to put

<item android:drawable="@drawable/down_arrow" android:state_expanded="false"/>

in it. For me, android:state_empty not working.

this is efficient way to set group indicator

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

<item android:state_empty="true">
    <layer-list>
        <item
            android:left="20dp"
            android:right="-30dp"
            android:top="120dp"
            android:bottom="10dp"
            android:drawable="@drawable/panier_plus">
        </item>
    </layer-list>
</item>

<item android:state_expanded="true">
    <layer-list>
        <item
            android:left="20dp"
            android:right="-30dp"
            android:top="120dp"
            android:bottom="10dp"
            android:drawable="@drawable/panier_minus"
             >
        </item>
    </layer-list>
</item>