ZMY_自定义分页加载

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//自定义分页加载

package com.example.pagedemo;

import java.util.ArrayList;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.ProgressBar;

public class MainActivity extends Activity {

   protected static final String TAG = "MainActivity";
   private ListView listView;
   private ArrayList<String> strList;
   private ArrayAdapter<String> arrayAdapter;
   private ProgressDialog dialog;
   Handler handler = new Handler() {
       public void handleMessage(android.os.Message msg) {
           // 让进度条消失
           pb.setVisibility(View.GONE);
           dialog.dismiss();
           if (arrayAdapter == null) {
               arrayAdapter = new ArrayAdapter<String>(MainActivity.this,
                       android.R.layout.simple_list_item_1,
                       android.R.id.text1, strList);
               listView.setAdapter(arrayAdapter);
           } else {
               arrayAdapter.notifyDataSetChanged();
           }
       };
   };

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       listView = (ListView) findViewById(R.id.listView);
       pb = (ProgressBar) findViewById(R.id.pb);
       // 创建集合，添加数据
       strList = new ArrayList<String>();
       loadData();
       listView.setOnScrollListener(new OnScrollListener() {

           @Override
           public void onScrollStateChanged(AbsListView view, int scrollState) {
               switch (scrollState) {
               // 停止的状态
               case OnScrollListener.SCROLL_STATE_IDLE:
                   // Log.i(TAG, "idle........");
                   // 获取最后一个条目的索引值
                   int lastVisiblePosition = view.getLastVisiblePosition();
                   // 等于集合长度减一
                   if (lastVisiblePosition == strList.size() - 1) {
                       // 加载数组
                       // 改变index的值
                       index = index + Max;
                       // 显示
                       pb.setVisibility(View.VISIBLE);
                       loadData();
                   }

                   break;
               // 惯性滑动
               case OnScrollListener.SCROLL_STATE_FLING:
                   // Log.i(TAG, "fling........");
                   break;
               // 滑动的状态
               case OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
                   // Log.i(TAG, "scroll.......");
                   break;
               default:
                   break;
               }
           }

           @Override
           public void onScroll(AbsListView view, int firstVisibleItem,
                   int visibleItemCount, int totalItemCount) {
               // Log.i(TAG, "firstVisibleItem" + firstVisibleItem
               // + "visibleItemCount" + visibleItemCount
               // + "totalItemCount" + totalItemCount);
           }
       });
   }

   int Max = 30;
   int index = 0;
   private ProgressBar pb;
   int progress = 0;

   private void loadData() {
       dialog = new ProgressDialog(MainActivity.this);
       dialog.setTitle("正在加载数据...");
       dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
       dialog.show();
       new Thread() {
           public void run() {
               for (int i = index; i < index + Max; i++) {
                   strList.add("我是第" + i + "个条目");
               }
               while (progress < 100) {
                   progress++;
                   dialog.setProgress(progress);
                   try {
                       sleep(10);
                   } catch (InterruptedException e) {
                       e.printStackTrace();
                   }
               }
               if (progress == 100) {
                   handler.sendEmptyMessage(0);
                   progress=0;
               }
           };
       }.start();
   }
}

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