Android 安卓系统中的AsynTask和无尽的Listview滚动
我正在创建一个应用程序,其中我需要有无休止的滚动列表视图。我不想在我的应用程序中使用任何库。我在网上看到了一些有助于实现此类listview的示例,但我的疑问是,当我的数据来自服务器并在异步任务中被解析时,如何才能拥有一个无休止的listview。如何从scroll上的asynctask一次加载10个项目?我想知道如何在asyntask上实现无休止的listview。 我是否在onScroll()中调用asynctaskAndroid 安卓系统中的AsynTask和无尽的Listview滚动,android,android-listview,android-asynctask,scroll,Android,Android Listview,Android Asynctask,Scroll,我正在创建一个应用程序,其中我需要有无休止的滚动列表视图。我不想在我的应用程序中使用任何库。我在网上看到了一些有助于实现此类listview的示例,但我的疑问是,当我的数据来自服务器并在异步任务中被解析时,如何才能拥有一个无休止的listview。如何从scroll上的asynctask一次加载10个项目?我想知道如何在asyntask上实现无休止的listview。 我是否在onScroll()中调用asynctask public class EndlessScrollExample ext
public class EndlessScrollExample 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;
public EventsBean eventsbean;
int counter = 0;
int currentPage = 0;
FetchEventValues fetchValues;
@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 = "my Url";
}
} catch (NullPointerException e) {
Log.i(TAG, "User Not Logged IN " + e.getMessage());
// TODO Auto-generated catch block
e.printStackTrace();
}
fetchValues = new FetchEventValues();
fetchValues.execute();
listview = getListView();
listview.setOnScrollListener(new EndlessScrollListener());
}
// AsyncTask Class called in the OnCreate() when the activity is first started.
public class FetchEventValues extends AsyncTask<Integer, Integer, Integer>
{
ProgressDialog progressdialog = new ProgressDialog(EndlessScrollExample.this);
@SuppressLint("SimpleDateFormat")
@SuppressWarnings("unchecked")
@Override
protected Integer doInBackground(Integer... params) {
currentPage++;
// Creating JSON Parser instance
JsonParser jParser = new JsonParser();
// getting JSON string from URL
//arrayEventsBeans.clear();
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");
arrayEventsBeans = new ArrayList<EventsBean>();
// @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();
/// Calendar alldates1 = Calendar.getInstance();
JSONArray jsonArray = eventobject.getJSONArray(dateKey);
System.out.println(" --"+jsonArray);
for (int i = 0 ; i < jsonArray.length() ; i++)
{
if ((today.compareTo(alldates) < 0 || (today.compareTo(alldates)== 0)))
// if (alldates1 > cal) alldates.getTime() >= today.getTime()
{
String currentTimeStr = "7:04 PM";
Date userDate = new Date();
String userDateWithoutTime = new SimpleDateFormat("yyyyMMdd").format(userDate);
String currentDateStr = userDateWithoutTime + " " + currentTimeStr;
Date currentDate = new SimpleDateFormat("yyyyMMdd h:mm a").parse(currentDateStr);
if (userDate.compareTo(currentDate) >= 0) {
System.out.println(userDate + " is greater than or equal to " + currentDate);
} else {
System.out.println(userDate + " is less than " + currentDate);
}
JSONObject jsonobjname = jsonArray.getJSONObject(i);
EventsBean 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){
Log.e(TAG , "Exception Occured:" + e.getMessage());
}
return null;
}
class CompareDate implements Comparator<DateBean>{
@Override
public int compare(DateBean d1, DateBean d2) {
return d1.getDate().compareTo(d2.getDate());
}
}
@Override
protected void onProgressUpdate(Integer... values) {
// TODO Auto-generated method stub
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(Integer result)
{
// TODO Auto-generated method stub
super.onPostExecute(result);
if(this.progressdialog.isShowing())
{
this.progressdialog.dismiss();
}
if(adapter == null)
{
adapter = new SAmpleAdapter(EndlessScrollExample.this, 0, arrayEventsBeans);
listview.setAdapter(adapter);
}
else
{
adapter.notifyDataSetChanged();
}
//currentPage++;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
this.progressdialog.setMessage("Loading....");
this.progressdialog.setCanceledOnTouchOutside(false);
this.progressdialog.show();
}
public int setPage(int currentPage) {
return currentPage;
// TODO Auto-generated method stub
}
}
public class EndlessScrollListener implements OnScrollListener {
private int visibleThreshold = 0;
private int currentPage = 0;
public EndlessScrollListener() {
}
public EndlessScrollListener(int visibleThreshold) {
this.visibleThreshold = visibleThreshold;
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
if (scrollState == SCROLL_STATE_IDLE) {
if (listview.getLastVisiblePosition() >= listview.getCount() - visibleThreshold) {
currentPage++;
fetchValues.setPage(currentPage);
fetchValues.execute();
}
}
}
}
}
public类endlesscrollExample扩展了ListActivity{
公共JSONArray JSONArray、JSONDATEARRY;
公共字符串url;
公共字符串selectedvalue;
公共字符串TAG=“标记事件显示”;
公共字符串暗示;
公共字符串SuggestState;
国家公共部门;
公共字符串事件id、地址;
弦拉特;
管柱液化天然气;
公共字符串事件名称;
公共字符串日期键;
公共字符串datetime,timenew;
日历校准;
公共共享参考优先权;
公共编辑;
公共字符串访问\u令牌、id、用户名;
公共静态ArrayList arrayEventsBeans=新ArrayList();
ArrayList sortArray=新的ArrayList();
公共适配器;
公共图像查看img_菜单,img_日历;
公共列表视图列表视图;
公共事件Bean事件Bean;
int计数器=0;
int currentPage=0;
获取事件值获取值;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
//TODO自动生成的方法存根
super.onCreate(savedInstanceState);
setTheme(android.R.style.Theme);
setContentView(R.layout.sample_);
listview=(listview)findViewById(android.R.id.list);
试一试{
//从FBConnection类的首选项获取的首选项值。
prefs=PreferenceManager.GetDefaultSharedReferences(getApplicationContext());
access\u token=prefs.getString(“access\u token”,null);
id=prefs.getString(“uid”,null);
username=prefs.getString(“username”,null);
if(access_token==null&&id==null&&username==null)
{
Toast.makeText(getApplicationContext(),“FaceBook登录未成功”+
“/n请重新登录。”,Toast.LENGTH\u SHORT).show();
}
其他的
{
Log.i(标记,“值::”+access_-token+“”+id+“”+username);
url=“我的url”;
}
}捕获(NullPointerException e){
Log.i(标记“用户未登录”+e.getMessage());
//TODO自动生成的捕捉块
e、 printStackTrace();
}
fetchValues=新的FetchEventValues();
fetchValues.execute();
listview=getListView();
setOnScrollListener(新的endlesscrollListener());
}
//首次启动活动时在OnCreate()中调用AsyncTask类。
公共类FetchEventValues扩展了AsyncTask
{
ProgressDialog ProgressDialog=新建ProgressDialog(EndlessScrollExample.this);
@SuppressLint(“SimpleDataFormat”)
@抑制警告(“未选中”)
@凌驾
受保护的整数doInBackground(整数…参数){
currentPage++;
//创建JSON解析器实例
JsonParser jParser=新的JsonParser();
//从URL获取JSON字符串
//arrayEventsBeans.clear();
JSONObject jsonobj=jParser.getJSONFromUrl(url);
Log.i(标签,“URL值:”+URL);
试一试{
//获取自动完成值的代码自动完成值
JSONArray jsonAarray=jsonobj.getJSONArray(Constants.LOCATIONS);
eventsbean=新的eventsbean();
Log.e(标记,“位置数组大小:”+jsonarray.length());
对于(int j=0;j0){
SimpleDataFormat格式化程序=新的SimpleDataFormat(“yyyy-MM-dd”);
Date=formatter.parse(日期字符串);
DateBean DateBean=新的DateBean(日期);
添加(dateBean);
}
//JSONArray JSONArray=eventobject.getJSONArray(日期字符串);
//System.out.println(“--”+jsonArray);
}
System.out.println(“大小:+sortArray.size());
System.out.println(“================排序数组=====”);
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