Android应用源码之Listview分页加载数据.zip项目安卓应用源码下载

package cn.itcast.pageloaddata; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.os.SystemClock; import android.util.Log; import android.view.View; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; import android.widget.ArrayAdapter; import android.widget.ListView; import cn.itcast.service.DataService; public class MainActivity extends Activity { protected static final int SUCCESS_GET_DATA = 0; private ListView listview; private DataService service; private List<String> data;// 加载的总数据 private ArrayAdapter<String> adapter; private boolean finish = true;// 是否加载完成 private View footer; private Handler mHandler = new Handler() { public void handleMessage(android.os.Message msg) { switch (msg.what) { case SUCCESS_GET_DATA: @SuppressWarnings("unchecked") ArrayList<String> result = ((ArrayList<String>) msg.obj); data.addAll(result); // 让listview自动刷新 adapter.notifyDataSetChanged(); finish = true; // 将页脚删除掉 if (listview.getFooterViewsCount() > 0) { listview.removeFooterView(footer); } break; default: break; } }; }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); listview = (ListView) findViewById(R.id.listview); service = new DataService(); data = new ArrayList<String>(); List<String> result = service.getData(0, 20); data.addAll(result); adapter = new ArrayAdapter<String>(this, R.layout.item, R.id.tv_info, data); footer = View.inflate(this, R.layout.footer, null); // 在增加listview的页脚之前，需要提前设置一次 listview.addFooterView(footer); listview.setAdapter(adapter); // 然后再次将页脚删除掉 listview.removeFooterView(footer); // 滚动监听事件 listview.setOnScrollListener(new MyOnScrollListener()); } private final class MyOnScrollListener implements OnScrollListener { // 加载的总页数 private int countPage = 5; // 每页加载20条数据 private int pageSize = 20; // 滚动状态发生改变时 public void onScrollStateChanged(AbsListView view, int scrollState) { Log.i("i", " scrollState " + scrollState); } // 当list开始滚动时 public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { // 最下面的条目数 final int totalCount = firstVisibleItem + visibleItemCount; int currentPage = totalCount / pageSize;// 当前页 int nextPage = currentPage + 1;// 下一页 // 当翻到最后一条数据时 if (totalCount == totalItemCount && nextPage <= countPage && finish) { // 已经移动到了listview的最后 finish = false; // 添加页脚 listview.addFooterView(footer); new Thread() { public void run() { SystemClock.sleep(3000); List<String> result = service.getData(totalCount + 1, pageSize); Message msg = new Message(); msg.what = SUCCESS_GET_DATA; msg.obj = result; mHandler.sendMessage(msg); }; }.start(); } } } }