1
我一直在这里停留了很长一段时间。我使用异步任务来检索事件列表并将它们添加到片段内的列表视图中。但是，它并没有显示出来。有人能告诉我什么是错的吗？这将是一个很大的帮助。CustomList未加入片段
这里的片段的代码：
public static class EventsSectionFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static final String ARG_SECTION_NUMBER = "section_number";
SharedPreferences settings = null;
Editor editor;
ListView list;
TextView noEventsTv;
public EventsSectionFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
recLifeCycle_with_savedInstanceState(savedInstanceState);
View rootView = inflater.inflate(R.layout.fragment_events, container, false);
list = (ListView) rootView.findViewById(R.id.list);
noEventsTv = (TextView) rootView.findViewById(R.id.norecordsTV);
new GetEventsAsyncTask((MainActivity) getActivity()).execute();
settings = PreferenceManager.getDefaultSharedPreferences(getActivity());
return rootView;
}
public void updateEventList(final List<Event> eventList)
{
Log.i("updateEventList:eventlist.count", String.valueOf(eventList.size()));
if (eventList.size() > 0)
{
Log.i("CustomList", "Start customlist inflation");
CustomList adapter = new CustomList(getActivity(), eventList);
noEventsTv.setVisibility(View.GONE);
list.setVisibility(View.VISIBLE);
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String eventSel = eventList.get(position).getEvent_id();
event_id = eventSel;
// direct to event details fragment
startEventDetailsFragment();
}
});
adapter.notifyDataSetChanged();
list.invalidateViews();
}
else
{
noEventsTv.setVisibility(View.VISIBLE);
list.setVisibility(View.GONE);
}
}
这里的异步任务检索的事件：
public class GetEventsAsyncTask extends AsyncTask<Void, Integer, Boolean>{
ProgressDialog progressDialog;
MainActivity activityMain;
Boolean ticketValid=false;
List<Event> eventList = new ArrayList<Event>();
public GetEventsAsyncTask(MainActivity parent)
{
activityMain = parent;
}
@Override
protected void onPreExecute() {
progressDialog = null;
if (progressDialog == null)
{
progressDialog = new ProgressDialog(activityMain);
progressDialog.setMessage("download events, please wait...");
progressDialog.show();
progressDialog.setCanceledOnTouchOutside(false);
progressDialog.setCancelable(false);
}
}
@Override
protected Boolean doInBackground(Void... params) {
// TODO Auto-generated method stub
Boolean error = false;
try {
error = postData();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return error;
}
protected void onPostExecute(Boolean error){
/* if (progressDialog.isShowing()) {
progressDialog.dismiss();
progressDialog = null;
} */
if(error==true)
{
Log.i("GetEvents", "Error at get events");
activityMain.errorOccured();
}
else
{
Log.i("onPostExecute:eventlist.count",String.valueOf(eventList.size()));
MainActivity.myDB.removeAllEvents();
for(int i=0;i<eventList.size();i++)
{
MainActivity.myDB.insertEventEntry(eventList.get(i));
}
activityMain.downloadEventsSuccess(eventList);
}
}
protected void onProgressUpdate(Integer... progress){
}
public Boolean postData() throws JSONException {
Boolean error = false;
HttpClient httpclient = new DefaultHttpClient();
// specify the URL you want to post to
try {
HttpGet httpget = new HttpGet(Constants.HOST_NAME+"/"+Constants.SERVICE_NAME+"/api/event?userId=S6871919D");
BufferedReader reader;
StringBuffer sb;
String line = "";
String NL="";
String json;
HttpResponse response = httpclient.execute(httpget);
if(response.getStatusLine().getStatusCode()==200)
{
reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8"));
sb = new StringBuffer("");
line = "";
NL = System.getProperty("line.separator");
while ((line = reader.readLine()) != null)
{
sb.append(line + NL);
}
reader.close();
json = sb.toString();
Log.i("event json",json);
try
{
JSONArray jsonArray = new JSONArray(json);
for (int i = 0, length = jsonArray.length(); i < length; i++)
{
JSONObject attribute = jsonArray.getJSONObject(i);
Event eventObj = new Event();
eventObj.setEvent_id(attribute.getString("event_id"));
eventObj.setEvent_title(attribute.getString("event_title"));
eventObj.setEvent_desc(attribute.getString("event_desc"));
eventObj.setStart_date(attribute.getString("start_date"));
eventObj.setEnd_date(attribute.getString("end_date"));
eventObj.setStart_time(attribute.getString("start_time"));
eventObj.setEnd_time(attribute.getString("end_time"));
eventObj.setLocation(attribute.getString("location"));
eventObj.setPicture_path(attribute.getString("picture_path"));
eventObj.setSmall_picture_path(attribute.getString("small_picture_path"));
eventList.add(eventObj);
eventObj = null;
}
}
catch (JSONException e)
{
e.printStackTrace();
error = true;
}
}
else
{
error = true;
}
} catch (ClientProtocolException e) {
// process execption
error = true;
} catch (IOException e) {
// process execption
error = true;
}
return error;
}
这里的customList的代码：
private final Activity context;
private final List<Event> eventsList;
public CustomList(Activity context, List<Event> eventsList) {
super(context, R.layout.list_single);
this.context = context;
this.eventsList = eventsList;
}
@Override
public View getView(int position, View view, ViewGroup parent) {
//set up the inflater...
LayoutInflater inflater = context.getLayoutInflater();
View rowView= inflater.inflate(R.layout.list_single, null, true);
//reference the widgets...
TextView txtTitle = (TextView) rowView.findViewById(R.id.txt);
TextView txtDate = (TextView) rowView.findViewById(R.id.txt2);
ImageView imageView = (ImageView) rowView.findViewById(R.id.img);
Log.i("CustomList", "Start customList");
txtTitle.setText(eventsList.get(position).getEvent_title());
txtDate.setText(eventsList.get(position).getStart_date());
new GetEventsImageAsyncTask(imageView).execute(Constants.HOST_NAME + "/"+ Constants.CMS_NAME+ "/" +eventsList.get(position).getSmall_picture_path());
Log.i("CustomList", "End customList");
return rowView;
}
这里的异步任务检索来自服务器的图像：
public class GetEventsImageAsyncTask extends AsyncTask<String, Void, Bitmap> {
ImageView imageView;
public GetEventsImageAsyncTask(ImageView imageView){
this.imageView = imageView;
}
@Override
protected Bitmap doInBackground(String... url) {
// TODO Auto-generated method stub
String urls = url[0];
Bitmap icon = null;
try
{
InputStream input = new java.net.URL(urls).openStream();
icon = BitmapFactory.decodeStream(input);
}
catch(Exception e)
{
Log.e("GetEventImage", e.getMessage());
e.printStackTrace();
}
return icon;
}
protected void onPostExecute(Bitmap result){
imageView.setImageBitmap(result);
}
这里的自定义列表中的XML：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/list_single"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/bg"
android:orientation="horizontal">
<ImageView
android:id="@+id/img"
android:layout_width="50dp"
android:layout_height="match_parent"
android:contentDescription="@drawable/ic_launcher"/>
<TextView
android:id="@+id/txt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/img"
android:text="Placeholder" />
<TextView
android:id="@+id/txt2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/img"
android:layout_marginTop="7dp"
android:layout_below="@+id/txt"
android:text="Placeholder" />
这是事件片段的XML：
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/fragment_events"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/bg">
<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
</ListView>
<TextView
android:id="@+id/norecordsTV"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="@string/no_events"
android:visibility="gone"
android:gravity="center"/>
</LinearLayout>
</FrameLayout>
代码不连去CustomList适配器=新CustomList（getActivity（ ）， 活动列表）;我不知道为什么。顺便检索事件顺便说一句。
编辑：
这里的logcat的：
10-10 12:56:44.193: I/updateEventList:eventlist.count(16963): 4
10-10 12:56:56.473: I/MYTAG(16963): FacilitiesSectionFragment.onPause
10-10 12:56:56.473: I/MYTAG(16963): FacilitiesSectionFragment.onStop
10-10 12:56:56.473: I/MYTAG(16963): FacilitiesSectionFragment.onDestroyView
10-10 12:56:56.553: I/dalvikvm(16963): Total arena pages for JIT: 25
10-10 12:56:56.553: I/dalvikvm(16963): Total arena pages for JIT: 26
10-10 12:56:56.553: I/dalvikvm(16963): Total arena pages for JIT: 27
10-10 12:56:56.553: I/dalvikvm(16963): Total arena pages for JIT: 28
10-10 12:56:56.553: I/dalvikvm(16963): Total arena pages for JIT: 29
10-10 12:56:56.553: I/dalvikvm(16963): Total arena pages for JIT: 30
10-10 12:56:56.553: I/dalvikvm(16963): Total arena pages for JIT: 31
10-10 12:56:56.553: I/dalvikvm(16963): Total arena pages for JIT: 32
10-10 12:56:56.563: I/dalvikvm(16963): Total arena pages for JIT: 33
10-10 12:56:56.563: I/dalvikvm(16963): Total arena pages for JIT: 34
10-10 12:56:56.563: I/dalvikvm(16963): Total arena pages for JIT: 35
10-10 12:56:56.563: I/dalvikvm(16963): Total arena pages for JIT: 36
10-10 12:56:56.563: I/dalvikvm(16963): Total arena pages for JIT: 37
10-10 12:56:56.563: I/dalvikvm(16963): Total arena pages for JIT: 38
10-10 12:56:56.563: I/dalvikvm(16963): Total arena pages for JIT: 39
10-10 12:56:56.563: I/dalvikvm(16963): Total arena pages for JIT: 40
10-10 12:56:56.563: I/dalvikvm(16963): Total arena pages for JIT: 41
10-10 12:56:57.333: I/MYTAG(16963): FacilitiesSectionFragment.onCreateView/savedInstanceState == null
10-10 12:56:57.333: I/MYTAG(16963): FacilitiesSectionFragment.onStart
10-10 12:56:57.333: I/MYTAG(16963): FacilitiesSectionFragment.onResume
10-10 12:56:57.383: I/facility json(16963): [{"facility_id":"ITM00000002","facility_name":"Libary","facility_desc":"The Nanyang Polytechnic Library provides a rich and diverse collection of resources to serve the information and research needs of staff and students.","requires_booking":"N","school_code":"ARO","open_hrs":"0900","close_hrs":"2100","open_for_book":null,"picture_path":"Data/Sites/1/uploads/alumniAdmin_Facility_2014-09-22_03-51-30.png","small_picture_path":"Data/Sites/1/uploads/alumniAdmin_Facility_2014-09-22_03-30-54.png","close_from":"0001-01-01T00:00:00","close_to":"0001-01-01T00:00:00","fee":"0.00"},{"facility_id":"ITM00000004","facility_name":"Table Tennis","facility_desc":"Table Tennis for playing table tennis","requires_booking":"N","school_code":"ARO","open_hrs":"0900","close_hrs":"2100","open_for_book":null,"picture_path":"Data/Sites/1/uploads/alumniAdmin_Facility_2014-09-22_03-31-44.png","small_picture_path":"Data/Sites/1/uploads/alumniAdmin_Facility_2014-09-22_03-31-44.jpg","close_from":"0001-01-01T00:00:00","close_to":"0001-01-01T00:00:00","fee":"3.00"},{"facility_id":"ITM00000009","facility_name":"Badminton Court Pass","facility_desc":"Badminton Court Pass","requires_booking":"N","school_code":"ARO","open_hrs":"0900","close_hrs":"2100","open_for_book":null,"picture_path":"Data/Sites/1/uploads/leowzzaro_Facility_2014-10-08_11-29-05.png","small_picture_path":"Data/Sites/1/uploads/leowzzaro_Facility_2014-10-08_11-29-05.jpg","close_from":"0001-01-01T00:00:00","close_to":"0001-01-01T00:00:00","fee":"0.00"},{"facility_id":"ITM00000014","facility_name":"Badminton Court","facility_desc":"Badminton Court for playing badminton","requires_booking":"Y","school_code":"ARO","open_hrs":"0900","close_hrs":"2100","open_for_book":null,"picture_path":"Data/Sites/1/uploads/leowzzaro_Facility_2014-10-08_11-22-44.png","small_picture_path":"Data/Sites/1/uploads/leowzzaro_Facility_2014-10-08_11-22-44.jpg","close_from":"0001-01-01T00:00:00","close_to":"0001-01-01T00:00:00","fee":"3.00"}]
10-10 12:56:57.393: I/onPostExecute:facilityList.count(16963): 4
10-10 12:56:57.403: W/MY_LOG(16963): Removing Entries from facilities Success
10-10 12:56:57.403: W/MY_LOG(16963): Inserted EntryName=Libary into table facilities
10-10 12:56:57.433: W/MY_LOG(16963): Inserted EntryName=Table Tennis into table facilities
10-10 12:56:57.453: W/MY_LOG(16963): Inserted EntryName=Badminton Court Pass into table facilities
10-10 12:56:57.493: W/MY_LOG(16963): Inserted EntryName=Badminton Court into table facilities
10-10 12:56:57.513: I/updateEventList:eventlist.count(16963): 4
10-10 12:57:06.523: I/MYTAG(16963): EcardSectionFrontFragment.onPause
10-10 12:57:06.523: I/MYTAG(16963): EcardSectionFrontFragment.onStop
10-10 12:57:06.533: I/MYTAG(16963): EcardSectionFrontFragment.onDestroyView
10-10 12:57:06.533: I/MYTAG(16963): TicketSectionFragment.onCreateView/savedInstanceState == null
10-10 12:57:06.543: I/MYTAG(16963): TicketSectionFragment.onStart
10-10 12:57:06.543: I/MYTAG(16963): TicketSectionFragment.onResume
10-10 12:57:14.203: I/MYTAG(16963): EcardSectionFrontFragment.onCreateView/savedInstanceState == null
10-10 12:57:14.203: I/MYTAG(16963): TicketSectionFragment.onPause
10-10 12:57:14.203: I/MYTAG(16963): TicketSectionFragment.onStop
10-10 12:57:14.203: I/MYTAG(16963): TicketSectionFragment.onDestroyView
10-10 12:57:14.203: I/MYTAG(16963): EcardSectionFrontFragment.onStart
10-10 12:57:14.203: I/MYTAG(16963): EcardSectionFrontFragment.onResume
发布你的logcat – Brendon 2014-10-10 03:47:09
logcat中没有错误。但是我会发布它。 – 2014-10-10 03:58:54
你确定你的eventList大小是> 0吗？如果你没有检查这部分，做一个登录该区域，并确保它是大于0值.. – Brendon 2014-10-10 04:01:38