onScroll事件不会触发ListView

我正在开发一个应用程序,我需要显示一些列表视图控制。 我只是在我的活动中实现OnScrollListener ,以便监视我的列表视图内容,但是当我为我的活动设置布局时,它不调用onScroll事件。 如果我评论该块,那么它调用它就好了。 我如何解决这个问题?

 package com.Threadtest; import com.Threadtest.main.myRunnable; import android.app.Activity; import android.app.ListActivity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.TextView; import android.widget.AbsListView.OnScrollListener; public class TestList extends ListActivity implements OnScrollListener { Aleph0 adapter = new Aleph0(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.test); ListView listview=(ListView)findViewById(android.R.id.list); listview.setAdapter(adapter); /*setListAdapter(adapter); getListView().setOnScrollListener(this);*/ } public void onScroll(AbsListView view, int firstVisible, final int visibleCount, int totalCount) { Log.i("TestList", "firstVisible="+firstVisible+" visibleCount="+visibleCount+" totalCount="+totalCount); boolean loadMore = /* maybe add a padding */ firstVisible + visibleCount >= totalCount; if(loadMore) { Log.i("TestList", "In Notify"); Thread thread = new Thread() { @Override public void run() { try { this.sleep(10000); runOnUiThread(new myRunnable(adapter,visibleCount)); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }; thread.start(); } } public void onScrollStateChanged(AbsListView v, int s) { } class myRunnable implements Runnable { Aleph0 adapter; public myRunnable(Aleph0 adapter,int visibleCount) { this.adapter=adapter; this.adapter.count += visibleCount; } public void run() { // TODO Auto-generated method stub Log.i("TestList", "List Count="+adapter.count); adapter.notifyDataSetChanged(); } } class Aleph0 extends BaseAdapter { int count = 40; /* starting amount */ public int getCount() { return count; } public Object getItem(int pos) { return pos; } public long getItemId(int pos) { return pos; } public View getView(int pos, View v, ViewGroup p) { if(pos!=count-1) { TextView view = new TextView(TestList.this); view.setText("entry " + pos); return view; } TextView view = new TextView(TestList.this); view.setText("Loading.. " + pos); return view; } } } 

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