Create Groupindicator For Expandablelistview Example

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Modify from final practise “ExpandableListView example“, to create groupIndicator.

Copy drawables to /res/drawable/ folder. In my exercise, btn_check_buttonless_on.png and btn_check_buttonless_off.png copied from Android SDK folder: /Android/sdk/platforms/android-20/data/res/drawable-mdpi/

Create /res/drawable/groupindicator.xml, to define our groupIndicator.

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

Modify /res/layout/activity_main.xml to specify android:groupIndicator of ExpandableListView.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical"     android:paddingBottom="@dimen/activity_vertical_margin"     android:paddingLeft="@dimen/activity_horizontal_margin"     android:paddingRight="@dimen/activity_horizontal_margin"     android:paddingTop="@dimen/activity_vertical_margin"     tools:context="com.example.androidexpandablelistview.MainActivity" >      <TextView         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_gravity="center_horizontal"         android:autoLink="web"         android:text="https://rootandroid.org//"         android:textStyle="bold" />      <ExpandableListView         android:id="@+id/mylist"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:groupIndicator="@drawable/groupindicator" />  </LinearLayout> 

Next:
Place groupIndicator of ExpandableListView on correct side