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I need a ExpandableListView when i click on child

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http://stackoverflow.com – i want a ExpandableListView if i click on child. I am getting error. can anyone solve my problem or any help would be appreciated. thanks in advance. logCat 01-09 11:44:57.938: E/AndroidRuntime(342): FATAL EXCEPTION: main 01-09 11:44:57.938: E/AndroidRuntime(342): java.lang.NullPointerException 01-09 11:44:57.938: E/AndroidRuntime(342): at com.example.datapractice.IndexActivity.createExpandableListViewDialog1 (IndexActivity.java:333) 01-09 11:44:57.938: E/AndroidRuntime(342): at com.example.datapractice.IndexActivity.access$13(IndexActivity.java:31 (HowTos)