我想创建Endless滚动视图，列出来自服务器的视图数据。我已创建，但在添加新数据时，列表视图可见项目从开始。当添加超过70行时，应用程序崩溃，错误说数组索引超出范围。 我是android的新手，我无法使用git hub库。
请任何人帮我提供一个简单的无尽列表视图示例或使用git hub库的教程。
有我的asyn类代码
private class AlertSearchAsync extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
String response = "";
for (String url : urls) {
DefaultHttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse execute = client.execute(httpGet);
InputStream content = execute.getEntity().getContent();
BufferedReader buffer = new BufferedReader(new InputStreamReader(content));
String s = "";
while ((s = buffer.readLine()) != null) {
response += s;
}
} catch (Exception e) {
e.printStackTrace();
}
}
return response;
}
@Override
protected void onPostExecute(String result) {
//pd.dismiss();
if(result.trim().contains("Result not found !"))
{
Toast.makeText(getApplicationContext(), result.trim(), Toast.LENGTH_LONG).show();
return;
}
else
{
mylist = new ArrayList<String>();
doc = XMLfunctions.XMLfromString(result);
// Toast.makeText(getApplicationContext(), ""+line, Toast.LENGTH_LONG).show();
NodeList nodes = doc.getElementsByTagName("JOB");
for (int i = 0; i < nodes.getLength(); i++) {
Element e = (Element) nodes.item(i);
pass_value.add(XMLfunctions.getValue(e, "id"));
if (!("null").equals(XMLfunctions.getValue(e, "location"))) {
mylist.add(XMLfunctions.getValue(e, "location"));
city_name.add(XMLfunctions.getValue(e, "location"));
} else {
mylist.add(" ");
}
if (!("null").equals(XMLfunctions.getValue(e, "title"))) {
mylist.add(XMLfunctions.getValue(e, "title"));
business_name.add(XMLfunctions.getValue(e, "title"));
} else {
mylist.add(" ");
}
if (!("null").equals(XMLfunctions.getValue(e, "state"))) {
mylist.add(XMLfunctions.getValue(e, "state"));
state_name.add(XMLfunctions.getValue(e, "state"));
} else {
mylist.add(" ");
}
if (!("null").equals(XMLfunctions.getValue(e, "company"))) {
mylist.add(XMLfunctions.getValue(e, "company"));
company_name.add(XMLfunctions.getValue(e, "company"));
} else {
mylist.add(" ");
}
if (!("null").equals(XMLfunctions.getValue(e, "url"))) {
mylist.add(XMLfunctions.getValue(e, "url"));
url_list.add(XMLfunctions.getValue(e, "url"));
} else {
mylist.add(" ");
}
if (!("null").equals(XMLfunctions.getValue(e, "description"))) {
mylist.add(XMLfunctions.getValue(e, "description"));
desc_list.add(XMLfunctions.getValue(e, "description"));
} else {
mylist.add(" ");
}
}
String[] company = new String[company_name.size()];
company = company_name.toArray(company);
String[] position = new String[business_name.size()];
position = business_name.toArray(position);
String[] state = new String[state_name.size()];
state = state_name.toArray(state);
String[] city = new String[city_name.size()];
city = city_name.toArray(city);
String[] url_str = new String[url_list.size()];
url_str = url_list.toArray(url_str);
String[] desc_str1 = new String[desc_list.size()];
desc_str1 = desc_list.toArray(desc_str1);
// datadap.setNotifyOnChange(false); // Prevents 'clear()' from clearing/resetting the listview
datadap.clear();
datadap= new Data(contect,company,position,city,state,pass_value,desc_str1);
// listView.setStackFromBottom(true);
// datadap.notifyDataSetChanged();
listView.setAdapter(datadap);
/* str_loc=str_locAlert;
str_desc=str_descAlert;
Toast.makeText(getApplicationContext(), "alert Class"+str_desc+str_loc, Toast.LENGTH_LONG).show();
Intent i= new Intent(Main_listview.this,Main_listview.class);
i.putExtra("line", result);
i.putExtra("limit", limit);
i.putExtra("Alert", true);
i.putExtra("str_Descrption",str_desc);
i.putExtra("str_location", str_loc);
startActivity(i); */
}
}
@Override
protected void onPreExecute()
{
//pd = ProgressDialog.show(Main_listview.this, "","Please wait...");
}
}
我正在加载更多这样的数据
listView.setOnScrollListener(new EndlessScrollListener() {
@Override
public void onLoadMore(int page, int totalItemsCount) {
// Triggered only when new data needs to be appended to the list
// Add whatever code is needed to append new items to your AdapterView
limit=limit+10;
// TODO Auto-generated method stub
AlertSearchAsync task1=new AlertSearchAsync();
String url="http://www.jobdiagnosis.com/fjobsrchservise.php?keyword="+
str_descAlert+
"&location="+str_locAlert+
"&start="+limit;
url=url.replace(" ", "%20");
//Toast.makeText(getApplicationContext(),"Limit"+limit, Toast.LENGTH_LONG).show();
task1.execute(url);
Log.d("URL ", url);
}
});
有我的无尽的滚动者课程
public abstract class EndlessScrollListener implements OnScrollListener {
// The minimum amount of items to have below your current scroll position
// before loading more.
private int visibleThreshold = 5;
// The current offset index of data you have loaded
private int currentPage = 0;
// The total number of items in the dataset after the last load
private int previousTotalItemCount = 0;
// True if we are still waiting for the last set of data to load.
private boolean loading = true;
// Sets the starting page index
private int startingPageIndex = 0;
public EndlessScrollListener() {
}
public EndlessScrollListener(int visibleThreshold) {
this.visibleThreshold = visibleThreshold;
}
public EndlessScrollListener(int visibleThreshold, int startPage) {
this.visibleThreshold = visibleThreshold;
this.startingPageIndex = startPage;
this.currentPage = startPage;
}
// This happens many times a second during a scroll, so be wary of the code you place here.
// We are given a few useful parameters to help us work out if we need to load some more data,
// but first we check if we are waiting for the previous load to finish.
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
// If the total item count is zero and the previous isn't, assume the
// list is invalidated and should be reset back to initial state
// If there are no items in the list, assume that initial items are loading
if (!loading && (totalItemCount < previousTotalItemCount)) {
this.currentPage = this.startingPageIndex;
this.previousTotalItemCount = totalItemCount;
if (totalItemCount == 0) { this.loading = true; }
}
// If it’s still loading, we check to see if the dataset count has
// changed, if so we conclude it has finished loading and update the current page
// number and total item count.
if (loading) {
if (totalItemCount > previousTotalItemCount) {
loading = false;
previousTotalItemCount = totalItemCount;
currentPage++;
}
}
// If it isn’t currently loading, we check to see if we have breached
// the visibleThreshold and need to reload more data.
// If we do need to reload some more data, we execute onLoadMore to fetch the data.
if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
onLoadMore(currentPage + 1, totalItemCount);
loading = true;
}
}
// Defines the process for actually loading more data based on page
public abstract void onLoadMore(int page, int totalItemsCount);
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
// Don't take any action on changed
}
}
我很抱歉我的英语不好
请帮助我如何创建无尽的滚动列表视图
答案 0 :(得分：0)
我想我可能会像@commonsware在这个例子中那样实现它：https://github.com/commonsguy/cwac-endless
基本上，您创建了ListView并附加Adapter，可自动处理Views的无限滚动和加载。