Android ListView 滚动加载数据

1. 预览

 

2. 代码

 

package android.test;
import java.util.ArrayList;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.AbsListView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.AbsListView.OnScrollListener;
public class Main extends Activity implements Runnable {
    private ListView m_listView;
    private ArrayList<String> m_data = new ArrayList<String>();
    private ArrayAdapter<String> m_adapter;
    private ProgressDialog m_progressDlg;

    private int m_nLastItem = 0;
    private Handler m_handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            m_progressDlg.dismiss();
            for (int i = m_listView.getCount(); i < m_listView.getCount() + 10; ++i) {
                m_data.add("test__" + i);
            }
            m_adapter.notifyDataSetChanged();
            m_listView.setSelection(m_nLastItem - 1);
        }
    };
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        m_listView = (ListView) findViewById(R.id.listView1);
        for (int i = 0; i < 10; ++i) {
            m_data.add("test__" + i);
        }
        m_adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, m_data);
        m_listView.setAdapter(m_adapter);
        m_listView.setOnScrollListener(new OnScrollListener() {
            @Override
            public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
                m_nLastItem = firstVisibleItem + visibleItemCount;
            }
            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
                if (m_nLastItem == m_adapter.getCount() && scrollState == OnScrollListener.SCROLL_STATE_IDLE) {
                    LoadRemainingItems();
                }
            }
        });
    }
    private void LoadRemainingItems() {
        m_progressDlg = ProgressDialog.show(Main.this, "信息", "正在加载数据...", true);
        Thread t = new Thread(Main.this);
        t.start();
    }
    @Override
    public void run() {
        try {
            Thread.sleep(3000);
            m_handler.sendEmptyMessage(0);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}