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I have onChildClick method on my application, this my code public class listview extends ExpandableListActivity { private static final String NAME = "NAME"; private static final String IS_EVEN = "IS_EVEN"; private ExpandableListAdapter mAdapter; List<Map<String, String>> groupData = new ArrayList<Map<String, String>>(); List<List<Map<String, String>>> childData = new ArrayList<List<Map<String, String>>>(); InputStream is; boolean addState = true; boolean addCountry; HashMap<String, String> countryMap = new HashMap<String, String>(); HashMap<String, String> stateMap = new HashMap<String, String>(); int count = 0; int count1 = -1; int count2 = 0; List<String> stateCount = new ArrayList<String>(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Reading data from text file to inout stream is = this.getResources().openRawResource(R.raw.countrystate); BufferedReader reader = new BufferedReader(new InputStreamReader(is)); try { String line = ""; while ((line = reader.readLine()) != null) { String[] strings = line.split("-"); String ctry = strings[0].trim(); String st = strings[1].trim(); /* * loading country and state to two separate hash tables */ if (countryMap.containsValue(ctry)) { addCountry = false; if (!addState) { stateMap.put("state" + count1 + count2, st); count2++; } } else { addCountry = !addCountry; count1++; //adding no. of states for a country to a list stateCount.add("" + count2); if (addCountry) { count2 = 0; countryMap.put("country" + count, ctry); stateMap.put("state" + count1 + count2, st); addState = false; } count2++; count++; } } } catch (Exception e) { } //re-arranging the state count list stateCount.add("" + count2

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