我有一个listview,当使用onscroll listener达到20rh listitem时会加载更多的listitems
我想添加一个页脚,说明在加载更多列表项时加载更多
当我到达第20个列表项时,应用程序崩溃说idex超出了logct
这是我的代码
logcat的
02-29 15:53:11.546 23342 23342 E AndroidRuntime
致命例外:主02-29 15:53:11.546 23342 23342 E
AndroidRuntime
java.lang.IndexOutOfBoundsException:索引9无效,大小为0 02-29 15:53:11.546 23342 23342 E AndroidRuntime
在 java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在java.util.ArrayList.get(ArrayList.java:304)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在com.enlightenme.pac.FinalAdapter.getItem(FinalAdapter.java:55)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在com.enlightenme.pac.FinalAdapter.getView(FinalAdapter.java:83)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在 com.baoyz.swipemenulistview.SwipeMenuAdapter.getView(SwipeMenuAdapter.java:65)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.widget.AbsListView.obtainView(AbsListView.java:2588)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.widget.ListView.makeAndAddView(ListView.java:1840)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.widget.ListView.fillDown(ListView.java:681)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.widget.ListView.fillSpecific(ListView.java:1339)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.widget.ListView.layoutChildren(ListView.java:1639)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.widget.AbsListView.onLayout(AbsListView.java:2427)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.view.View.layout(View.java:14938)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.view.ViewGroup.layout(ViewGroup.java:4601)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.widget.FrameLayout.onLayout(FrameLayout.java:448)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.view.View.layout(View.java:14938)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.view.ViewGroup.layout(ViewGroup.java:4601)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.widget.FrameLayout.onLayout(FrameLayout.java:448)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.view.View.layout(View.java:14938)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.view.ViewGroup.layout(ViewGroup.java:4601)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.widget.LinearLayout.setChildFrame(LinearLayout.java:1694)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.widget.LinearLayout.layoutVertical(LinearLayout.java:1552)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.widget.LinearLayout.onLayout(LinearLayout.java:1465)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.view.View.layout(View.java:14938)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.view.ViewGroup.layout(ViewGroup.java:4601)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.widget.FrameLayout.onLayout(FrameLayout.java:448)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.view.View.layout(View.java:14938)02-29 15:53:11.546 23342 23342 E AndroidRuntime at android.view.ViewGroup.layout(ViewGroup.java:4601)02-29 15:53:11.546 23342 23342 E AndroidRuntime at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2212)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2026)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1236)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在 android.view.ViewRootImpl $ TraversalRunnable.run(ViewRootImpl.java:5160)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在 android.view.Choreographer $ CallbackRecord.run(Choreographer.java:791) 02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.view.Choreographer.doCallbacks(Choreographer.java:591)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.view.Choreographer.doFrame(Choreographer.java:561)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在 android.view.Choreographer $ FrameDisplayEventReceiver.run(Choreographer.java:777)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.os.Handler.handleCallback(Handler.java:725)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.os.Handler.dispatchMessage(Handler.java:92)02-29 15:53:11.546 23342 23342 E AndroidRuntime
在android.os.Looper.loop(Looper.java:176)02-29 15:53:11.546 23342 23342 E AndroidRuntime at android.app.ActivityThread.main(ActivityThread.java:5365)02-29 15:53:11.546 23342 23342 E AndroidRuntime
at java.lang.reflect.Method.invokeNative(Native Method)02-29 15:53:11.546 23342 23342 E AndroidRuntime
at java.lang.reflect.Method.invoke(Method.java:511)02-29 15:53:11.546 23342 23342 E AndroidRuntime at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1102) 02-29 15:53:11.546 23342 23342 E AndroidRuntime
在
我的活动
public class InterActivity extends Activity
{
SwipeMenuListView listview;
//ListView listview;
View mFooterView;
@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();
mProgressDialog = new ProgressDialog(InterActivity.this);
mProgressDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
// Set progressdialog title
//mProgressDialog.setTitle("BEGINNER CODES");
// Set progressdialog message
mProgressDialog.setMessage("Loading. Please wait loading ....");
mProgressDialog.setIndeterminate(true);
mProgressDialog.setCancelable(false);
mProgressDialog.setIndeterminateDrawable(getResources().getDrawable(R.anim.progress_handler));
// Show progressdialog
mProgressDialog.show();
}
@Override
protected Void doInBackground(Void... params) {
// my do in backgroung process
}
@Override
protected void onPostExecute(Void result) {
// Locate the listview in listview_main.xml
// listview = (ListView) findViewById(R.id.inter_layoutListView);
listview = (SwipeMenuListView) findViewById(R.id.inter_layoutListView);
// Pass the results into ListViewAdapter.java
adapter = new FinalAdapter(InterActivity.this,
codelist);
mFooterView = LayoutInflater.from(InterActivity.this).inflate(R.layout.footer_layout, null);
// Binds the Adapter to the ListView
listview.setAdapter(adapter);
// Close the progressdialog
mProgressDialog.dismiss();
//设置onscrll侦听器
listview.setOnScrollListener(new OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view,
int scrollState) { // TODO Auto-generated method stub
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() {
super.onPreExecute();
listview.addFooterView(mFooterView);
}
@Override
protected Void doInBackground(Void... params) {
// my load mmore data process
}
@Override
protected void onPostExecute(Void result) {
int position = listview.getLastVisiblePosition();
adapter.notifyDataSetChanged();
listview.removeFooterView(mFooterView);
listview.setSelectionFromTop(position, 0);
}
}
}
答案 0 :(得分:1)
您正在更改适配器中的数据,它的大小将变为零。正确看看Loadmore
AsyncTask,它可能会改变适配器的大小