ListView下拉加载一(分页)_移动开发_编程开发_程序员俱乐部

首先创建在主xml里放置一个listview列表,代码如下：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    tools:context=".MainActivity" >

    <ListView
        android:id="@+id/menuList"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="1" >
    </ListView>

</LinearLayout>

再创建2个xml，分别为列表项（menu.xml）和加载界面（loadmore.xml）

menu.xml代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
    <TextView
        android:id="@+id/showView"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content"
        android:padding="10dp"
        style="@style/normalText"
        android:text="title"
        />
    <TextView 
        android:id="@+id/content"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:text="123"
        />
</LinearLayout>

loadmore.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal"
     >
    
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:background="@drawable/list_bg"
         >
    <ProgressBar
        android:id="@+id/progressBar1"
        android:layout_width="25dp"
        android:layout_height="25dp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="正在加载数据..." />
    </LinearLayout>
</LinearLayout>

loadmore的背景样式list_bg.xml：

<?xml version="1.0" encoding="utf-8"?>  
<shape xmlns:android="http://schemas.android.com/apk/res/android">  
      <gradient  
           android:startColor="#ccc"  
           android:endColor="#ccc"  
           android:angle="45"  
      />  
</shape>  

入口代码如下：

package com.tp.soft.app;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;

public class MainActivity extends Activity{

    private ListView mListView;
    
    private View mLoadMoreView;
    
    private ProgressBar mLoadBtn;
    
    private PageAdapter adapter;
    
    private Handler handler = new Handler();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        mLoadMoreView = getLayoutInflater().inflate(R.layout.loadmore, null);
        
        mLoadBtn = (ProgressBar) mLoadMoreView.findViewById(R.id.progressBar1);
        //mLoadBtn.setOnClickListener(this);
        
        mListView = (ListView) findViewById(R.id.menuList);
        
        //下拉滚动触发事件
        mListView.setOnScrollListener(new OnScrollListener() {
            
            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
                //不滚动
                if(scrollState == OnScrollListener.SCROLL_STATE_IDLE){
                    //滚动最底部
                    if(view.getLastVisiblePosition() == view.getCount() -1){
                        //mLoadBtn.setText("正在加载中...");
                        MyRunnable r = new MyRunnable();
                        handler.postDelayed(r, 2000);
                    }
                }
            }
            
            @Override
            public void onScroll(AbsListView view, int firstVisibleItem,
                    int visibleItemCount, int totalItemCount) {
            }
        });
        
        mListView.addFooterView(mLoadMoreView);
        List<String> itemList = new ArrayList<String>();
        for (int i = 0; i < 10; i++) {
            itemList.add("title"+i);
        }
        
        adapter = new PageAdapter(itemList);
        mListView.setAdapter(adapter);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    /*@Override
    public void onClick(View v) {
        mLoadBtn.setText("正在加载中...");
        MyRunnable r = new MyRunnable();
        handler.postDelayed(r, 2000);
    }*/
    
    
    class MyRunnable implements Runnable{

        @Override
        public void run() {
            Log.e("提示", "123");
            loadMoreDate();
            //更新UI
            adapter.notifyDataSetChanged();
            //mLoadBtn.setText("查看更多...");
        }
    }
    
    
    
    class PageAdapter extends BaseAdapter {
        
        List<String> itemList;
        
        public PageAdapter(List<String> itemList){
            this.itemList = itemList;
        }
        
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if(convertView == null){
                convertView = LayoutInflater.from(getApplicationContext()).inflate(R.layout.menu, null);
            }
            TextView titleView = (TextView) convertView.findViewById(R.id.showView);
            titleView.setText(itemList.get(position));
            return convertView;
        }
        
        @Override
        public long getItemId(int position) {
            return position;
        }
        
        @Override
        public Object getItem(int position) {
            return itemList.get(position);
        }
        
        @Override
        public int getCount() {
            return itemList.size();
        }
        
        public void addItem(String str){
            itemList.add(str);
        }
    }
    
    private void loadMoreDate() {
        Log.e("总数", ""+adapter.getCount());
        int count = adapter.getCount();
        for(int i = count+1; i < count+10; i++){
            adapter.addItem("title"+i);
        }
    }
}

运行结果：