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我有數據作爲JSON數組進入，我解析它。這裏有一個例子：動態添加組和標題到可擴展列表視圖
[{"Tag":"Amusement Parks","Category":"Attractions"},{"Tag":"Restaurant","Category":"Food"}, etc]
我想要做的就是讓每一個「分類」中的ListView和每一個「標籤」這頭的孩子頭。現在我硬編碼頭的和添加的標籤是這樣的：但
listDataHeader.add("Attractions");
listDataHeader.add("Food");
listDataHeader.add("Lodging");
...
JSONArray jArray = new JSONArray(result);
Log.d("Array Length: ", Integer.toString(jArray.length()));
for (int i = 0; i < jArray.length(); i++) {
final JSONObject json = jArray.getJSONObject(i);
if (json.getString("Category").equals("Attractions")) {
tempAttractions.add(json.getString("Tag"));
}
if (json.getString("Category").equals("Food")) {
tempFood.add(json.getString("Tag"));
}
if (json.getString("Category").equals("Lodging")) {
tempLodging.add(json.getString("Tag"));
}
}
}
protected void onPostExecute(Void... params) {
listDataChild.put(listDataHeader.get(0), tempAttractions);
listDataChild.put(listDataHeader.get(1), tempFood);
listDataChild.put(listDataHeader.get(2), tempLodging);
而不是硬編碼的類別，我要動態地從JSON數據添加類別。
所以基本上，這樣的事情...
//obviously pseudo code...
if (json.getString("Category") exists as a header already) {
add json.getString("Tag") as a child under that group
//or if it doesn't exist
} else {
add a header header and add json.getString("Tag") as a child under that group
}
我認爲這更多的是一種概念上的問題，我似乎無法把握的方式來完成這件事。有任何想法嗎？謝謝！
全碼
公共類CategorySelect擴展BaseActivity {
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
private String[] navMenuTitles;
private TypedArray navMenuIcons;
List<String> listAttractions;
List<String> listFood;
List<String> listLodging;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_category_select);
// initialize Nav Drawer
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
set(navMenuTitles, navMenuIcons);
progress = new ProgressDialog(this);
progress.setMessage("Loading...Please Wait");
progress.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progress.setIndeterminate(true);
// get the listview
expListView = (ExpandableListView) findViewById(R.id.lvExp);
// preparing list data
prepareListData();
listAdapter = new ExpandableListAdapter(this, listDataHeader,
listDataChild);
// setting list adapter
expListView.setAdapter(listAdapter);
}
private void prepareListData() {
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();
// Adding child data
listDataHeader.add("Attractions");
listDataHeader.add("Food");
listDataHeader.add("Lodging");
listAttractions = new ArrayList<String>();
listFood = new ArrayList<String>();
listLodging = new ArrayList<String>();
new FillCategories().execute();
}
private class FillCategories extends
AsyncTask<Integer, Void, Void> {
List<String> tempAttractions = new ArrayList<String>();
List<String> tempFood = new ArrayList<String>();
List<String> tempLodging = new ArrayList<String>();
@Override
protected ArrayList<Location> doInBackground(Integer... params) {
String result = "";
InputStream isr = null;
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(
"");
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
String action = "nav";
nameValuePairs.add(new BasicNameValuePair("action", action));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
isr = entity.getContent();
} catch (Exception e) {
Log.e("log_tag", "Error in http connection " + e.toString());
}
// convert response to string
try {
BufferedReader reader = new BufferedReader(
new InputStreamReader(isr, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
isr.close();
result = sb.toString();
} catch (Exception e) {
Log.e("log_tag", "Error converting result " + e.toString());
}
// parse json data
try {
JSONArray jArray = new JSONArray(result);
Log.d("Array Length: ", Integer.toString(jArray.length()));
for (int i = 0; i < jArray.length(); i++) {
final JSONObject json = jArray.getJSONObject(i);
//Log.d("Text", json.getString("Txt"));
if (json.getString("Cat").equals("Attractions")) {
tempAttractions.add(json.getString("Txt"));
if (json.getString("Tag").equals(null)) {
tempAttractionsTags.add(json.getString("Txt"));
} else {
tempAttractionsTags.add(json.getString("Tag"));
}
}
if (json.getString("Cat").equals("Food")) {
tempFood.add(json.getString("Txt"));
if (json.getString("Tag").equals(null)) {
tempFoodTags.add(json.getString("Txt"));
} else {
tempFoodTags.add(json.getString("Tag"));
}
}
if (json.getString("Cat").equals("Lodging")) {
tempLodging.add(json.getString("Txt"));
if (json.getString("Tag").equals("")) {
tempLodgingTags.add(json.getString("Txt"));
Log.d("Tag", "Is Null");
} else {
tempLodgingTags.add(json.getString("Tag"));
Log.d("Tag Not Null", json.getString("Tag"));
}
}
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
protected void onPostExecute(Void... params) {
listDataChild.put(listDataHeader.get(0), tempAttractions);
listDataChild.put(listDataHeader.get(1), tempFood);
listDataChild.put(listDataHeader.get(2), tempLodging);
}
}
}