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你好，我已經成功地在我的應用程序中做了一個可擴展的列表視圖，從一個例子和很多的鬥爭，但我真的不明白我是如何成功地得到用戶點擊正確的索引，我的意思，我真的不知道childData中的內容以及groupData和childData如何相互關聯。我需要一些幫助來理解這些人，我從來沒有以這種方式看過泛型。所以這裏是我的問題：需要幫助瞭解onChildClick android
1-如何childData和groupData彼此相關，是groupData到childData Map？ 2-如何String selectedWord = childData.get(groupPosition).get(childPosition).get(NAME); 在listView中獲得正確的單詞和標題（或組）？
下面的代碼：
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.expandable_list_layout);
DBManager db = new DBManager(getApplicationContext());
List<String> header = db.selectAllCategories();
List<Map<String, String>> groupData = new ArrayList<Map<String, String>>();
final List<List<Map<String, String>>> childData = new ArrayList<List<Map<String, String>>>();
for (String category : header) {
Map<String, String> curGroupMap = new HashMap<String, String>();
groupData.add(curGroupMap);
curGroupMap.put(NAME, category);
List<String> categoryWords = db.selectWordsFromCategory(category);
List<Map<String, String>> children = new ArrayList<Map<String, String>>();
for (String word : categoryWords) {
Map<String, String> curChildMap = new HashMap<String, String>();
children.add(curChildMap);
curChildMap.put(NAME, word);
}
childData.add(children);
}
//create SimpleExpandableListAdapter object...
lv.setOnChildClickListener(new OnChildClickListener() {
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
//How does the below code works?
//How can i get the group value from the childData map
//i thought childData had only childs in it?
String selectedWord = childData.get(groupPosition).get(childPosition).get(NAME);
Log.i("You clicked here:", selectedWord)
return false;
}
});
感謝您的時間。