在Android的无尽滚动列表视图 [英] endless scroll list view in android
本文介绍了在Android的无尽滚动列表视图的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想创造无尽滚动视图，列表视图数据从服务器来。我正在创建但是当添加新的数据，那么列表视图中可见项目从开始启动。并增加超过70行时，然后应用程序崩溃和错误说数组索引出界。
我是新android的我不能够使用git枢纽库。
I want to create Endless scroll view , list view data coming from server. i am created but when add new data then list view visible item started from start. And when add more than 70 rows then application crashed and error say array index out of bound. I am new in android i am not able to use git hub library.
请任何一个帮助我提供源源不断的列表视图的一个简单的例子或教程使用git的枢纽库。
Please any one help me provide a simple example of endless list view or tutorial to use git hub library.
有我ASYN类code
there my asyn class code
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...");
}
}
和我是装载这样的更多的数据。
and i am load more data like this
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endlessscrollistner类
there my endlessscrollistner class
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
}
}
我继电器抱歉我的英语不好
I am relay sorry about my bad English
请帮我如何才能创造无限滚动列表视图
Please help me how we can create endless scroll list view
推荐答案
我想我可能实现这个，在这个例子@commonsware的方式做：的 https://github.com/commonsguy/cwac-endless
I think I might implement this the way that @commonsware does in this example: https://github.com/commonsguy/cwac-endless
基本上你创建一个的ListView 并附加适配器自动处理的无尽滚动和装载查看。
Basically you create a ListView and attach an Adapter that automatically handles the endless scrolling and loading of Views.
请参阅类文件的位置：<一href=\"https://github.com/commonsguy/cwac-endless/blob/master/src/com/commonsware/cwac/endless/EndlessAdapter.java\" rel=\"nofollow\">https://github.com/commonsguy/cwac-endless/blob/master/src/com/commonsware/cwac/endless/EndlessAdapter.java
这篇关于在Android的无尽滚动列表视图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
