Android中使用Listview动态加载数据

listview 是android网络开发中经常使用的一种控件，像现在的人人网、微博等等android客户端，都在使用它，但是大家不难发现其在加载数据的过程中不是一次性加载完，而是没等你看过固定条数据后再继续加载，这样对于需要加载的大量数据；来说分开进行，客户体验比较好。一下是listview实现动态加载数据的方法。只是一个简单的框架。（转自于网络）

import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.BaseAdapter; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.ProgressBar; import android.widget.TextView; import android.widget.Toast; import android.widget.AbsListView.OnScrollListener; import android.widget.LinearLayout.LayoutParams; public class ListViewForLoading extends Activity implements OnScrollListener { private listViewAdapter adapter = new listViewAdapter(); ListView listView; LinearLayout loadingLayout; private Thread mThread; /** * 设置布局显示属性 */ private LayoutParams mLayoutParams = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); /** * 设置布局显示目标最大化属性 */ private LayoutParams FFlayoutParams = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT); private ProgressBar progressBar; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); init(); } private void init() { // TODO Auto-generated method stub // 线性布局 LinearLayout layout = new LinearLayout(this); // 设置布局 水平方向 layout.setOrientation(LinearLayout.HORIZONTAL); // 进度条 progressBar = new ProgressBar(this); // 进度条显示位置 progressBar.setPadding(0, 0, 15, 0); // 把进度条加入到layout中 layout.addView(progressBar, mLayoutParams); // 文本内容 TextView textView = new TextView(this); textView.setText("加载中..."); textView.setGravity(Gravity.CENTER_VERTICAL); // 把文本加入到layout中 layout.addView(textView, FFlayoutParams); // 设置layout的重力方向，即对齐方式是 layout.setGravity(Gravity.CENTER); // 设置ListView的页脚layout loadingLayout = new LinearLayout(this); loadingLayout.addView(layout, mLayoutParams); loadingLayout.setGravity(Gravity.CENTER); // 得到一个ListView用来显示条目 listView = (ListView) findViewById(R.id.tv); // 添加到脚页显示 listView.addFooterView(loadingLayout); // 给ListView添加适配器 listView.setAdapter(adapter); // 给ListView注册滚动监听 listView.setOnScrollListener(this); } /** * 要用用于生成显示数据 * * @author huangbq * */ class listViewAdapter extends BaseAdapter { int count = 10; 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) { TextView view; if (v == null) { view = new TextView(ListViewForLoading.this); } else { view = (TextView) v; } view.setText("ListItem " + pos); view.setTextSize(20f); view.setGravity(Gravity.CENTER); view.setHeight(60); return view; } } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { // TODO Auto-generated method stub if(firstVisibleItem+visibleItemCount==totalItemCount) { //开线程去下载网络数据 if (mThread == null || !mThread.isAlive()) { mThread = new Thread() { @Override public void run() { try { //这里放你网络数据请求的方法，我在这里用线程休眠5秒方法来处理 Thread.sleep(5000); } catch (InterruptedException e) { e.printStackTrace(); } Message message = new Message(); message.what = 1; handler.sendMessage(message); } }; mThread.start(); } } } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { // TODO Auto-generated method stub } private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { // TODO Auto-generated method stub switch (msg.what) { case 1: if (adapter.count <= 41) { adapter.count += 10; int currentPage = adapter.count / 10; Toast.makeText(getApplicationContext(),"第" + currentPage + "页", Toast.LENGTH_LONG).show(); } else { listView.removeFooterView(loadingLayout); } //重新刷新Listview的adapter里面数据 adapter.notifyDataSetChanged(); break; default: break; } } }; }

程序运行结果：

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