ListView下拉加载一(分页)

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：

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