参考资料:
首先新建一个layout文件，命名为moredata.xml，包含一个Button和一个ProgressBar，xml代码如下：
然后定义一个item.xml,其作用是定义ListView的每个item的视图，代码如下：
下面是主MainActivity.java代码：
package cn.llbb.testlistview2;
import android.support.v7.app.ActionBarActivity;
import java.util.*;
import android.os.Bundle;
import android.os.Handler;
import android.view.*;
import android.view.View.*;
import android.widget.*;
import android.widget.AbsListView.OnScrollListener;
public class MainActivity extends ActionBarActivity implements OnScrollListener{
private ListView list = null;
private SimpleAdapter mSimpleAdapter;
private Button bt;
private ProgressBar pg;
private Handler handler;
private ArrayList> listitem;
private View moreView;
private int MaxDateNum;
private int lastVisibleIndex;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list = (ListView) findViewById(R.id.listView1);
MaxDateNum = 65;
listitem = new ArrayList>();
moreView = getLayoutInflater().inflate(R.layout.moredata, null);
bt = (Button) moreView.findViewById(R.id.bt_load);
pg = (ProgressBar) moreView.findViewById(R.id.pg);
handler = new Handler();
listitem = new ArrayList>();
for(int i = 0;i < 10; i++){
HashMap item = new HashMap();
item.put("ItemTitle", "第" + i + "行标题");
item.put("ItemText", "第" + i + "行内容");
listitem.add(item);
}
mSimpleAdapter = new SimpleAdapter(this, listitem, R.layout.item,
new String[]{"ItemTitle","ItemText"},
new int[]{R.id.tv_title,R.id.tv_content});
list.addFooterView(moreView);
list.setAdapter(mSimpleAdapter);
bt.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
pg.setVisibility(View.VISIBLE);
bt.setVisibility(View.GONE);
handler.postDelayed(new Runnable() {
@Override
public void run() {
loadMoreDate();// 加载更多数据
bt.setVisibility(View.VISIBLE);
pg.setVisibility(View.GONE);
mSimpleAdapter.notifyDataSetChanged();// 通知listView刷新数据
}
}, 2000);
}
});
}
private void loadMoreDate() {
int count = mSimpleAdapter.getCount();
if (count + 5 < MaxDateNum) {
// 每次加载5条
for (int i = count; i < count + 5; i++) {
HashMap map = new HashMap();
map.put("ItemTitle", "新增第" + i + "行标题");
map.put("ItemText", "新增第" + i + "行内容");
listitem.add(map);
}
} else {
// 数据已经不足5条
for (int i = count; i < MaxDateNum; i++) {
HashMap map = new HashMap();
map.put("ItemTitle", "新增第" + i + "行标题");
map.put("ItemText", "新增第" + i + "行内容");
listitem.add(map);
}
}
}
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
lastVisibleIndex = firstVisibleItem + visibleItemCount - 1;
if (totalItemCount == MaxDateNum + 1) {
list.removeFooterView(moreView);
Toast.makeText(this, "数据全部加载完成，没有更多数据！", Toast.LENGTH_LONG).show();
}
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
if (scrollState == OnScrollListener.SCROLL_STATE_IDLE
&& lastVisibleIndex == mSimpleAdapter.getCount()) {
}
}
}
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