Android开发中Listview动态加载数据的方法示例

package org.developerworks.android;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;      }    }  };}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="wrap_content"  android:layout_height="wrap_content">  <ListView android:id="@+id/tv"    android:layout_width="wrap_content"    android:layout_height="wrap_content"/></LinearLayout>