Android 应用程序在使用滚动侦听器显示listvview时应用加载页脚时崩溃
我的listview最初加载15项。当用户滚动到最后时,列表视图应加载接下来的15个项目,以此类推,此过程将继续。当列表视图加载时,它应该显示加载页脚。但当我运行应用程序时,前15个项目加载,当滚动到最后一个项目加载下一个项目时,应用程序崩溃 我的代码Android 应用程序在使用滚动侦听器显示listvview时应用加载页脚时崩溃,android,listview,footer,onscroll,Android,Listview,Footer,Onscroll,我的listview最初加载15项。当用户滚动到最后时,列表视图应加载接下来的15个项目,以此类推,此过程将继续。当列表视图加载时,它应该显示加载页脚。但当我运行应用程序时,前15个项目加载,当滚动到最后一个项目加载下一个项目时,应用程序崩溃 我的代码 public class InterActivity extends Activity { ListView listview; List<ParseObject> ob; ProgressDialog mProgressD
public class InterActivity extends Activity
{
ListView listview;
List<ParseObject> ob;
ProgressDialog mProgressDialog;
FinalAdapter adapter;
List<CodeList> codelist = null;
SharedPreference shrdPreference;
private int limit = 15;
View footerView;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.inter_layout);
shrdPreference = new SharedPreference();
//Execute RemoteDataTask AsyncTask
new RemoteDataTask().execute();
}
private class RemoteDataTask extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Create a progresssdialog
mProgressDialog = new ProgressDialog(InterActivity.this);
// Set progressdialog title
mProgressDialog.setTitle("Loading");
// Set progressdialog messsage
mProgressDialog.setMessage("Please wait loading ...");
mProgressDialog.setIndeterminate(false);
mProgressDialog.setCancelable(false);
// Show progressdialog
mProgressDialog.show();
}
@Override
protected Void doInBackground(Void... params) {
// Create the array
codelist = new ArrayList<CodeList>();
try {
// Locate the class table named "Country" in Parse.com
ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("InterActivity");
// Locate the columnn named "ranknum" in Parse.com and order list
// by ascending
query.orderByAscending("_created_at");
query.setLimit(limit);
ob = query.find();
for (ParseObject inter : ob) {
map.setIntroduction((String) inter.get("intro"));
map.setFinalCodeText((String) inter.get("codetext"));
codelist.add(map);
}
} catch (ParseException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// Locate the listview in listview_main.xml
listview = (ListView) findViewById(R.id.inter_layoutListView);
// Pass the results into ListViewAdapter.java
adapter = new FinalAdapter(InterActivity.this, codelist);
// AlphaInAnimationAdapter animationAdapter = new AlphaInAnimationAdapter(adapter);
// animationAdapter.setAbsListView(listview);
// Binds the Adapter to the ListVieww
listview.setAdapter(adapter);
//listview.setOnItemClickListener(InterActivity.this);
//listview.setOnItemLongClickListener(InterActivity.this);
// Close the progressdialog
mProgressDialog.dismiss();
//setup onscrll listener
listview.setOnScrollListener(new OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view,
int scrollState) { // TODO Auto generated method stubb
int threshold = 1;
int count = listview.getCount();
if (scrollState == SCROLL_STATE_IDLE) {
if (listview.getLastVisiblePosition() >= count
- threshold) {
// Execute LoadMoreDataTask AsyncTask
new Loadmore().execute();
}
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
// TODO Auto-generated method stub
}});
}
}
private class Loadmore extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
footerView = ((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.loadmore, null, false);
listview.addFooterView(footerView);
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... params) {
// Create the array
codelist.clear();
try {
// Locate the class table named "Country" in Parse.com
ParseQuery<ParseObject> query = new ParseQuery<ParseObject>(
"InterActivity");
// Locate the column named "ranknum" in Parse.com and order list
// by ascending
query.orderByAscending("_created_at");
query.setLimit(limit += 15);
ob = query.find();
for (ParseObject inter : ob) {
map.setFinalCodeText((String) inter.get("codetext"));
codelist.add(map);
}
} catch (ParseException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
int position = listview.getLastVisiblePosition();
adapter.notifyDataSetChanged();
listview.removeFooterView(footerView);
listview.setSelectionFromTop(position, 0);
super.onPostExecute(result);
}
}
公共类交互扩展了活动
{
列表视图列表视图;
列表ob;
进程对话框;
最终适配器;
列表代码列表=空;
SharedReference shrdReference;
私人整数限制=15;
视图页脚视图;
@凌驾
创建时的公共void(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.inter_layout);
shrdReference=新的SharedReference();
//执行RemoteDataTaskAsyncTask
新建RemoteDataTask().execute();
}
私有类RemoteDataTask扩展了AsyncTask{
@凌驾
受保护的void onPreExecute(){
super.onPreExecute();
//创建一个ProgressDialog
mProgressDialog=新建ProgressDialog(InterActivity.this);
//设置进程对话框标题
mProgressDialog.setTitle(“加载”);
//设置进程对话框消息
设置消息(“请等待加载…”);
mProgressDialog.setUndeterminate(false);
mProgressDialog.setCancelable(假);
//显示进度对话框
mProgressDialog.show();
}
@凌驾
受保护的Void doInBackground(Void…参数){
//创建数组
codelist=newarraylist();
试一试{
//在Parse.com中找到名为“Country”的类表
ParseQuery=新的ParseQuery(“交互性”);
//在Parse.com和订单列表中找到名为“ranknum”的列
//上升
query.orderByAscending(“\u created\u at”);
query.setLimit(limit);
ob=query.find();
for(ParseObject inter:ob){
map.setIntroduction((字符串)inter.get(“intro”);
setFinalCodeText((字符串)inter.get(“codetext”);
添加(map);
}
}捕获(解析异常){
Log.e(“Error”,e.getMessage());
e、 printStackTrace();
}
返回null;
}
@凌驾
受保护的void onPostExecute(void结果){
//在listview_main.xml中找到listview
listview=(listview)findViewById(R.id.inter_layoutListView);
//将结果传递到ListViewAdapter.java中
adapter=newfinaladapter(InterActivity.this,codelist);
//AlphaInAnimationAdapter animationAdapter=新的AlphaInAnimationAdapter(适配器);
//animationAdapter.setAbsListView(listview);
//将适配器绑定到ListVieww
setAdapter(适配器);
//setOnItemClickListener(InterActivity.this);
//setOnItemLongClickListener(InterActivity.this);
//关闭progressdialog
mProgressDialog.disclose();
//设置onscrll侦听器
setOnScrollListener(新的OnScrollListener(){
@凌驾
CrollStateChanged上的公共无效(AbsListView视图,
int scrollState){//TODO自动生成的方法stubb
int阈值=1;
int count=listview.getCount();
如果(滚动状态==滚动状态空闲){
如果(listview.getLastVisiblePosition()>=计数
-阈值){
//执行LoadMoreDataTask异步任务
新建Loadmore().execute();
}
}
}
@凌驾
public void onScroll(AbsListView视图,int firstVisibleItem,
int visibleItemCount,int totalItemCount){
//TODO自动生成的方法存根
}});
}
}
私有类Loadmore扩展异步任务{
@凌驾
受保护的void onPreExecute(){
footerView=((LayoutInflater)getSystemService(Context.LAYOUT\u充气器\u SERVICE)).inflate(R.LAYOUT.loadmore,null,false);
addFooterView(footerView);
super.onPreExecute();
}
@凌驾
受保护的Void doInBackground(Void…参数){
//创建数组
clear();
试一试{
//在Parse.com中找到名为“Country”的类表
ParseQuery=新的ParseQuery(
“互动性”);
//在Parse.com和订单列表中找到名为“ranknum”的列
//上升
query.orderByAscending(“\u created\u at”);
query.setLimit(limit+=15);
ob=query.find();
for(parseobjectinter:ob){
setFinalCodeText((字符串)inter.get(“codetext”);
添加(map);
}
}捕获(解析异常){
Log.e(“Error”,e.getMessage());
e、 printStackTrace();
}
返回null;
}
@凌驾
受保护的void onPostExecute(void结果){
int position=listview.getLastVisiblePosition();
adapter.notifyDataSetChanged();
移除页脚视图(页脚视图);
listview.setSelectionFromTop(位置0);
super.onPostExecute(结果);
}
}
logcat
01-06 12:44:53.279 12753 12753 E AndroidRuntime致命异常:main 01-06 12:44:53.279 12753 12753 E
AndroidRuntime进程: com.indightme.pac,PID:12753 01-06 12:44:53.279 12753 12753 E
AndroidRuntime
java.lang.IndexOutOfBoundsException:索引10无效,大小为1 01-06 12:44:53.279 12753 12753 E AndroidRuntime
在 throwIndexOutOfBoundsException(ArrayList.java:255)
您的min sdk是什么?您测试的Android版本是什么?@DanielNugent我的最低sdk版本是17您的min sdk是什么?您测试的Android版本是什么?@DanielNugent我的最低sdk版本是17