我正在尝试在应用程序代码中使用Endless listview适配器，但有些我怎么也无法在listview中看到任何值。使用普通的listview适配器时，我的代码运行得非常好。我试图使用CWAC-无尽的adpater。我可以得到如何使用我的asynctask运行它，因为它在loding后给我空白屏幕。 下面是我的代码。
public class EndlessAdapterExample extends ListActivity {
public JSONArray jsonarray,jsondatearray;
public String url;
public String selectedvalue;
public String TAG = "TAG Event Display";
public String SuggestCity;
public String SuggestState;
public String suggestCountry;
public String event_id,address;
String lat;
String lng;
public String event_name;
public String dateKey;
public String datetime,timenew;
Calendar cal;
public SharedPreferences prefs;
public Editor editor;
public String access_token,id,username;
public static ArrayList<EventsBean> arrayEventsBeans = new ArrayList<EventsBean>();
ArrayList<DateBean> sortArray = new ArrayList<DateBean>();
public SAmpleAdapter adapter;
public ImageView img_menu,img_calender;
public ListView listview;
static int LIST_SIZE;
private int mLastOffset = 0;
static final int BATCH_SIZE = 10;
ArrayList<EventsBean> countriesSub = new ArrayList<EventsBean>();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setTheme(android.R.style.Theme);
setContentView(R.layout.sample_endless);
listview = (ListView)findViewById(android.R.id.list);
try {
// Preferences values fetched from the preference of FBConnection class.
prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
access_token = prefs.getString("access_token", null);
id = prefs.getString("uid", null);
username = prefs.getString("username", null);
if(access_token == null && id == null && username == null)
{
Toast.makeText(getApplicationContext(), "FaceBook Login was not successful" +
"/nPlease Relogin.", Toast.LENGTH_SHORT).show();
}
else
{
Log.i(TAG, "VALUES::" + access_token+ " " + id + " " +username);
url = "mu Url"
}
} catch (NullPointerException e) {
Log.i(TAG, "User Not Logged IN " + e.getMessage());
// TODO Auto-generated catch block
e.printStackTrace();
}
init();
listview.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,long arg3) {
// TODO Auto-generated method stub
// Fetching the position from the listview which has been selected.
}
});
}
private void init() {
new FetchEventValues().execute();
}
private void setLastOffset(int i) {
mLastOffset = i;
}
private int getLastOffset(){
return mLastOffset;
}
private void displayList(ArrayList<EventsBean> countriesSub) {
setListAdapter(new DemoAdapter());
}
// AsyncTask Class called in the OnCreate() when the activity is first started.
public class FetchEventValues extends AsyncTask<Void, ArrayList<EventsBean>, ArrayList<EventsBean>>
{
ProgressDialog progressdialog = new ProgressDialog(EndlessAdapterExample.this);
ArrayList<EventsBean> merge = new ArrayList<EventsBean>();
ArrayList<EventsBean> localList;
public EventsBean eventsbean;
@SuppressLint("SimpleDateFormat")
@SuppressWarnings("unchecked")
@Override
protected ArrayList<EventsBean> doInBackground(Void... params) {
// Creating JSON Parser instance
JsonParser jParser = new JsonParser();
// getting JSON string from URL
JSONObject jsonobj = jParser.getJSONFromUrl(url);
Log.i(TAG, "URL VALUES:" + url);
try{
// Code to get the auto complete values Autocomplete Values
JSONArray jsonAarray = jsonobj.getJSONArray(Constants.LOCATIONS);
eventsbean = new EventsBean();
Log.e(TAG, "Location Array Size:" + jsonAarray.length());
for(int j = 0 ; j < jsonAarray.length() ; j++)
{
if(!jsonAarray.getJSONObject(j).isNull(Constants.LOCATION_CITY) && !jsonAarray.getJSONObject(j).isNull(Constants.LOCATION_STATE) && !jsonAarray.getJSONObject(j).isNull(Constants.LOCATION_COUNTRY))
{
JSONObject job = jsonAarray.getJSONObject(j);
if(job.has(Constants.LOCATION_STATE))
{
SuggestCity = job.getString(Constants.LOCATION_CITY);
eventsbean.setLocation_city(job.getString(Constants.LOCATION_CITY));
SuggestState = job.getString(Constants.LOCATION_STATE);
eventsbean.setLocation_state(job.getString(Constants.LOCATION_STATE));
suggestCountry = job.getString(Constants.LOCATION_COUNTRY);
eventsbean.setLocation_country(job.getString(Constants.LOCATION_COUNTRY));
}
}
}
// JSON object to fetch the events in datewise format
JSONObject eventobject = jsonobj.getJSONObject("events");
// @SuppressWarnings("unchecked")
Iterator<Object> keys = eventobject.keys();
while (keys.hasNext()) {
String datestring = String.valueOf(keys.next());
if (datestring.trim().length() > 0) {
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
Date date = formatter.parse(datestring);
DateBean dateBean = new DateBean(date);
sortArray.add(dateBean);
}
// JSONArray jsonArray = eventobject.getJSONArray(datestring);
//System.out.println(" --"+jsonArray);
}
System.out.println("size:"+sortArray.size());
System.out.println("==========sorting array======");
Collections.sort(sortArray,new CompareDate());
//reverse order
//Collections.reverse(sortArray);
for(DateBean d : sortArray){
dateKey = new SimpleDateFormat("yyyy-MM-dd").format(d.getDate());
System.out.println(dateKey);
Date today = new Date();
Date alldates = d.getDate();
cal = Calendar.getInstance();
/// Calendar alldates1 = Calendar.getInstance();
JSONArray jsonArray = eventobject.getJSONArray(dateKey);
System.out.println(" --"+jsonArray);
for (int i = 0 ; i < jsonArray.length() ; i++)
{
if (alldates.compareTo(today) > 0)
// if (alldates1 > cal) alldates.getTime() >= today.getTime()
{
JSONObject jsonobjname = jsonArray.getJSONObject(i);
eventsbean = new EventsBean();
JSONObject jobjectpicture = jsonobjname.getJSONObject(Constants.PICTURE);
JSONObject jobjeventpicture = jobjectpicture.getJSONObject(Constants.DATA);
eventsbean.setUrl(jobjeventpicture.getString(Constants.URL));
if(jsonobjname.has(Constants.OWNER))
{
JSONObject owner_obj = jsonobjname.getJSONObject(Constants.OWNER);
eventsbean.setOwner_id(owner_obj.getString(Constants.OWNER_ID));
eventsbean.setOwner_name(owner_obj.getString(Constants.OWNER_NAME));
String owner_name = owner_obj.getString(Constants.OWNER_NAME);
Log.i(TAG, "Owner:" + owner_name);
}
if(!jsonobjname.isNull(Constants.COVER))
{
JSONObject objectcover = jsonobjname.getJSONObject(Constants.COVER);
eventsbean.setCover_id(objectcover.getString(Constants.COVER_ID));
eventsbean.setSource(objectcover.getString(Constants.SOURCE));
String cover_url = objectcover.getString(Constants.SOURCE);
Log.i(TAG, "Cover Url:" + cover_url);
eventsbean.setOffset_y(objectcover.getString(Constants.OFFSET_Y));
eventsbean.setOffset_x(objectcover.getString(Constants.OFFSET_X));
}
eventsbean.setName(jsonobjname.getString(Constants.NAME));
eventsbean.setEvent_id(jsonobjname.getString(Constants.EVENT_ID));
eventsbean.setStart_time(jsonobjname.getString(Constants.START_TIME));
eventsbean.setDescription(jsonobjname.getString(Constants.DESCRIPTION));
eventsbean.setLocation(jsonobjname.getString(Constants.LOCATION));
if(!jsonobjname.isNull(Constants.IS_SILHOUETTE))
{
eventsbean.setIs_silhouette(jsonobjname.getString(Constants.IS_SILHOUETTE));
}
eventsbean.setPrivacy(jsonobjname.getString(Constants.PRIVACY));
datetime = jsonobjname.getString(Constants.START_TIME);
if(!jsonobjname.isNull(Constants.VENUE))
{
JSONObject objectvenue = jsonobjname.getJSONObject(Constants.VENUE);
if(objectvenue.has(Constants.VENUE_NAME))
{
eventsbean.setVenue_name(objectvenue.getString(Constants.VENUE_NAME));
event_name = objectvenue.getString(Constants.VENUE_NAME);
Log.i(TAG, "Event Venue Name:" + event_name);
}
else
{
eventsbean.setLatitude(objectvenue.getString(Constants.LATITUDE));
eventsbean.setLongitude(objectvenue.getString(Constants.LONGITUDE));
eventsbean.setCity(objectvenue.getString(Constants.CITY));
eventsbean.setState(objectvenue.getString(Constants.STATE));
eventsbean.setCountry(objectvenue.getString(Constants.COUNTRY));
eventsbean.setVenue_id(objectvenue.getString(Constants.VENUE_ID));
eventsbean.setStreet(objectvenue.getString(Constants.STREET));
address = objectvenue.getString(Constants.STREET);
eventsbean.setZip(objectvenue.getString(Constants.ZIP));
}
}
arrayEventsBeans.add(eventsbean);
Log.i(TAG, "arry list values:" + arrayEventsBeans.size());
}
}
}
}catch(Exception e){
localList=null;
Log.e(TAG , "Exception Occured:" + e.getMessage());
}
return arrayEventsBeans;
}
class CompareDate implements Comparator<DateBean>{
@Override
public int compare(DateBean d1, DateBean d2) {
return d1.getDate().compareTo(d2.getDate());
}
}
@Override
protected void onPostExecute(ArrayList<EventsBean> result) {
super.onPostExecute(result);
if(this.progressdialog.isShowing())
{
this.progressdialog.dismiss();
}
// adapter = new SAmpleAdapter(EndlessAdapterExample.this,0, arrayEventsBeans);
//listview.setAdapter(adapter);
//displayList(arrayEventsBeans);
LIST_SIZE = arrayEventsBeans.size();
for (int i = 0; i <= BATCH_SIZE; i++) {
countriesSub.add(arrayEventsBeans.get(i));
}
setLastOffset(BATCH_SIZE);
displayList(countriesSub);
Log.i(TAG, "country list:" + countriesSub.size());
}
@Override
protected void onPreExecute() {
super.onPreExecute();
this.progressdialog.setMessage("Loading....");
this.progressdialog.setCanceledOnTouchOutside(false);
this.progressdialog.show();
}
}
public class SAmpleAdapter extends ArrayAdapter<EventsBean> {
Context context;
public ArrayList<EventsBean> mOriginalvalues;
private ArrayList<EventsBean> mDisplayvalues;
ImageLoader imageloader;
public String datenew,datetime,date_text_value,timenew;
public int date_text,year;
public String time,month,description;
public LayoutInflater inflator = null;
public SAmpleAdapter(Context context, int resource, ArrayList<EventsBean> mEventarraylist) {
super(context, resource , mEventarraylist);
// TODO Auto-generated constructor stub
this.mOriginalvalues = mEventarraylist;
this.mDisplayvalues = mEventarraylist;
inflator = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
imageloader=new ImageLoader(context.getApplicationContext());
getFilter();
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return mOriginalvalues.size();
}
@Override
public EventsBean getItem(int position) {
// TODO Auto-generated method stub
return mOriginalvalues.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Holder viewHolder;
if(convertView == null)
{
viewHolder=new Holder();
convertView = inflator.inflate(R.layout.activity_list_items, parent, false);
viewHolder.txt_name = (TextView)convertView.findViewById(R.id.textname);
viewHolder.txt_owner_name = (TextView)convertView.findViewById(R.id.ownername);
viewHolder.txt_time = (TextView)convertView.findViewById(R.id.date);
viewHolder.txt_date = (TextView)convertView.findViewById(R.id.txt_date_value);
viewHolder.txt_month = (TextView)convertView.findViewById(R.id.txt_month_value);
viewHolder.txt_year = (TextView)convertView.findViewById(R.id.txt_year_value);
viewHolder.userimg = (ImageView)convertView.findViewById(R.id.imageView1);
convertView.setTag(viewHolder);
}
else
{
viewHolder=(Holder)convertView.getTag();
}
viewHolder.txt_name.setText(mOriginalvalues.get(position).getName());
viewHolder.txt_owner_name.setText(mOriginalvalues.get(position).getOwner_name());
String url = mOriginalvalues.get(position).getSource();
date_text_value = mOriginalvalues.get(position).getStart_time();
try {
parseDateFromString(date_text_value);
} catch (Exception e) {
Log.i("Adapter TAG", "Date Exception" + e.getMessage());
}
viewHolder.txt_date.setText(String.valueOf(date_text));
viewHolder.txt_month.setText(month);
viewHolder.txt_year.setText(String.valueOf(year));
Log.i("TEST", "Date:" + date_text_value);
imageloader.DisplayImage(url, viewHolder.userimg);
viewHolder.txt_time.setText(timenew);
return convertView;
}
public void resetData() {
mOriginalvalues = mDisplayvalues;
}
@SuppressLint("SimpleDateFormat")
public Date parseDateFromString(String aDateString){
SimpleDateFormat inputFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
Calendar c = Calendar.getInstance();
Date date= new Date();
try {
date= inputFormat.parse(aDateString);
System.out.println(date);
SimpleDateFormat day = new SimpleDateFormat("dd-MMM-yyyy");
SimpleDateFormat time = new SimpleDateFormat("hh:mm a", Locale.getDefault());
SimpleDateFormat month_date = new SimpleDateFormat("MMM");
c.setTime(inputFormat.parse(aDateString));
System.out.println(day.format(date));
datenew = day.format(date).toString();
date_text = c.get(Calendar.DAY_OF_MONTH);
month = month_date.format(c.getTime());
year = c.get(Calendar.YEAR);
System.out.println("Year = " + c.get(Calendar.YEAR));
System.out.println("Month = " + month);
System.out.println("Day = " + date_text);
System.out.println(time.format(date));
timenew = time.format(date).toString();
} catch (ParseException e) {
Log.i("TAG", "DateFormat Pasring Error:" + e.getMessage());
}
return date;
}
private class Holder{
TextView txt_name;
TextView txt_owner_name ;
TextView txt_time;
TextView txt_date;
TextView txt_month;
TextView txt_year;
ImageView userimg;
}
}
class DemoAdapter extends EndlessAdapter {
private RotateAnimation rotate=null;
ArrayList<EventsBean> tempList = new ArrayList<EventsBean>();
LayoutInflater inflator = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
DemoAdapter() {
super(new SAmpleAdapter(EndlessAdapterExample.this,R.layout.sample_endless,countriesSub));
inflator = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
rotate=new RotateAnimation(0f, 360f, Animation.RELATIVE_TO_SELF,
0.5f, Animation.RELATIVE_TO_SELF,
0.5f);
rotate.setDuration(600);
rotate.setRepeatMode(Animation.RESTART);
rotate.setRepeatCount(Animation.INFINITE);
}
@Override
protected View getPendingView(ViewGroup parent) {
View row=getLayoutInflater().inflate(R.layout.row, null);
View child=row.findViewById(R.id.textview1);
child.setVisibility(View.GONE);
child=row.findViewById(R.id.throbber);
child.setVisibility(View.VISIBLE);
child.startAnimation(rotate);
return(row);
}
@Override
protected boolean cacheInBackground() {
tempList.clear();
int lastOffset = getLastOffset();
if(lastOffset < LIST_SIZE){
int limit = lastOffset + BATCH_SIZE;
for(int i=(lastOffset+1); (i<=limit && i<LIST_SIZE); i++){
tempList.add(arrayEventsBeans.get(i));
}
setLastOffset(limit);
if(limit<LIST_SIZE){
return true;
} else {
return false;
}
} else {
return false;
}
}
@SuppressLint("NewApi")
@Override
protected void appendCachedData() {
@SuppressWarnings("unchecked")
ArrayAdapter<EventsBean> arrAdapterNew = (ArrayAdapter<EventsBean>)getWrappedAdapter();
int listLen = tempList.size();
for(int i=0; i<listLen; i++){
arrAdapterNew.addAll(tempList.get(i));
}
}
}
}
我已更新了我的代码。我想我的问题现在是使用自定义适配器，因为它在列表视图结束后给了我多个值。最初我确实获得了10个值但是在更新之后它再次获得相同的10个值但是计数达到了121.
答案 0 :(得分：0)
替换您的init()，如下所示
private void init() {
new FetchEventValues().execute();
}
并将onPostExecute()替换为下面的
@Override
protected void onPostExecute(ArrayList<EventsBean> result) {
super.onPostExecute(result);
if (this.progressdialog.isShowing()) {
this.progressdialog.dismiss();
}
// adapter = new SAmpleAdapter(EndlessAdapterExample.this,0,
// arrayEventsBeans);
// listview.setAdapter(adapter);
LIST_SIZE = arrayEventsBeans.size();
for (int i = 0; i <= BATCH_SIZE; i++) {
countriesSub.add(arrayEventsBeans.get(i));
}
setLastOffset(BATCH_SIZE);
displayList(countriesSub);
}