我有一个应用程序，它从云中获取数据并将其显示在列表视图中。我得到的数据来自API的两个来源，另一个来自解析云。首先显示来自API的数据，它取得顶级列表视图项的位置，稍后显示来自解析云的数据并占据较低位置。我希望从解析云中获取的数据占据顶部列表视图项中的位置（当检索到数据时）以及从API中取出的数据向下移动。
private class GetContacts extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
list.setAdapter(adapter);
}
@Override
protected Void doInBackground(Void... arg0) {
getIp = getIpAddress();
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();
// Making a request to url and getting response
String jsonStr = sh
.makeServiceCall(url + getIp, ServiceHandler.GET);
ParseQuery<ParseObject> query = ParseQuery.getQuery("ads");
query.findInBackground(new FindCallback<ParseObject>() {
public void done(List<ParseObject> scoreList, ParseException e) {
for (int i = 0; i < scoreList.size(); i++) {
try {
ParseFile file = (ParseFile) scoreList.get(i)
.get("appImage");
HashMap<String, String> contact = new HashMap<String, String>();
String desc = scoreList.get(i)
.getString("Desc");
String AppTitle = scoreList.get(i).getString(
"AppTitle");
String appUrl = scoreList.get(i).getString(
"appUrl");
String imageUrl = file.getUrl();
String Existing_user = scoreList.get(i)
.getString("ExistingUser");
if (Existing_user.equals("true")) {
existing = true;
} else if (Existing_user.equals("false")) {
existing = false;
}
// adding each child node to HashMap key =>
// value
if (AppTitle != null) {
contact.put(TAG_NAME, AppTitle);
} else {
contact.put(TAG_NAME,
"Ultimate Voice Recorder");
}
if (desc != null) {
contact.put(TAG_DESC, desc);
} else {
contact.put(TAG_DESC,
"DESC");
}
if (imageUrl != null) {
contact.put(TAG_PHOTO_URL, imageUrl);
} else {
contact.put(
TAG_PHOTO_URL,
"URL");
}
if (appUrl != null) {
contact.put(TAG_APP_URL, appUrl);
} else {
contact.put(
TAG_APP_URL,
"AppUrl");
}
// adding contact to contact list
appsList.add(contact);
adapter.notifyDataSetChanged();
} catch (Exception ex) {
ex.printStackTrace();
BugSenseHandler.sendException(ex);
}
}
// Toast.makeText(TodaysPicks.this, scoreList.size(),
// Toast.LENGTH_SHORT).show();
Log.d("score", "Retrieved " + scoreList.size()
+ " scores");
}
});
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
contacts = jsonObj.getJSONArray(TAG_APPS);
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
String name = c.getString(TAG_NAME);
String email = c.getString(TAG_DESC);
// Phone node is JSON Object
String photoUrl = c.getString(TAG_PHOTO_URL);
String appUrl = c.getString(TAG_APP_URL);
// tmp hashmap for single contact
HashMap<String, String> contact = new HashMap<String, String>();
// adding each child node to HashMap key => value
contact.put(TAG_NAME, name);
contact.put(TAG_DESC, email);
contact.put(TAG_PHOTO_URL, photoUrl);
contact.put(TAG_APP_URL, appUrl);
// adding contact to contact list
appsList.add(contact);
}
} catch (JSONException e) {
e.printStackTrace();
BugSenseHandler.sendException(e);
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
try {
if ((pDialog != null) && pDialog.isShowing()) {
pDialog.dismiss();
}
} catch (final Exception e) {
BugSenseHandler.sendException(e);
} finally {
pDialog = null;
}
adapter.notifyDataSetChanged();
}
}
答案 0 :(得分：0)
您可以创建一个自定义对象的ArrayList，它包含您想要的各种信息。然后在ListAdapter中，返回适当的数据。当您的AsyncTask返回时，更新ArrayList以使您的新元素先出现，然后调用ListAdapter.notifyDataSetChanged。