Android ListView分頁，動態添加數據

1.ListView分頁的實現，重點在于實現OnScrollListener接口，判斷滑動到最后一項時，是否還有數據可以加載，

我們可以利用listView.addFootView(View v)方法進行提示

自定義一個ListView（這里本來想進行一些自定已修改的。。。實際代碼并沒有做）CornerListView

package com.example.testlistview;import android.widget.AbsListView;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.ListView;public class CornerListView extends ListView{public CornerListView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);// TODO Auto-generated constructor stub
    }public CornerListView(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stub
    }public CornerListView(Context context) {super(context);// TODO Auto-generated constructor stub
    }
}

包含ListView的配置文件 activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context="com.example.testlistview.MainActivity" ><com.example.testlistview.CornerListView android:layout_width="fill_parent"android:layout_height="fill_parent"android:layout_margin="10dip"android:id="@+id/list"></com.example.testlistview.CornerListView></RelativeLayout>

ListView每一項的Item配置文件? listview_item.xml

<?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" ><TextViewandroid:id="@+id/tvTitle"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="1"android:gravity="center_horizontal"></TextView>
</LinearLayout>

有更多數據時的配置文件more.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent" ><TextView android:id="@+id/tv_msg"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerInParent="true"android:text="更多"/><ProgressBar android:id="@+id/loading"style="@android:style/Widget.ProgressBar.Large"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerHorizontal="true"android:visibility="gone"/>
</RelativeLayout>

CorernerListView對應的Adapter適配器 CornerAdapter.java

package com.example.testlistview;import java.util.List;import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;public class CornerAdapter extends BaseAdapter{LayoutInflater inflater;public List<String> list;private Context context;public CornerAdapter(List<String> list, Context context) {this.list = list;this.context = context;}@Overridepublic int getCount() {return list.size();}@Overridepublic Object getItem(int position) {return list.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder viewHolder;if(convertView == null){viewHolder = new ViewHolder();convertView = LayoutInflater.from(context).inflate(R.layout.listview_item, null, false);TextView tv1= (TextView) convertView.findViewById(R.id.tvTitle);viewHolder.tv = tv1;convertView.setTag(viewHolder);}else{viewHolder = (ViewHolder) convertView.getTag();}viewHolder.tv.setText(list.get(position));return convertView;}class ViewHolder{public TextView tv;}
}

主Activity代碼：

package com.example.testlistview;import java.util.ArrayList;
import java.util.List;import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.TextView;public class MainActivity extends Activity implements OnScrollListener{private int pageIndex = 1;private int pageSize = 2;private int pageCount = 2;//初始設置頁數為2，因為剛開始不知道總頁數private CornerListView listView;private CornerAdapter adapter;private View footer,tvMsg,loading;private boolean is_divPage = false;//是否分頁private List<String> list = new ArrayList<String>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);listView = (CornerListView) findViewById(R.id.list);listView.setOnScrollListener(this);footer = View.inflate(this, R.layout.more, null);tvMsg = footer.findViewById(R.id.tv_msg);loading = footer.findViewById(R.id.loading);listView.addFooterView(footer);//添加footerviewThread thread = new Thread(runnable);//第一次訪問服務器接口，返回第一頁信息，并確定總頁數信息
        thread.start();}//異步訪問網絡加載數據之類的。。Runnable runnable = new Runnable() {@Overridepublic void run() {//傳遞pageIndex,pageSize，URL等參數訪問網絡獲取數據，這里省略。。。//doSomethingString strJson = "";//假定strJson就是服務器返回的這一頁Json數據//假設這里返回總頁數為5pageCount = 5;Message msg = new Message();msg.obj = strJson;handler.sendMessage(msg);//將消息返回給UI
            }};//處理返回的消息，設置ListViewHandler handler = new Handler(){@Overridepublic void handleMessage(Message msg) {String strJson = msg.obj.toString();//各種轉換組合數據，這里我們就不做了，模擬一下數據for(int i=0;i<pageSize; ++i){if(adapter != null && adapter.list != null)//從獲取第二頁開始，直接修改適配器的list
                {adapter.list.add(i+"");}else//第一次適配器還沒有構造
                {list.add(i+"");}}if(pageIndex == 1)//第一次，設置適配器
            {adapter = new CornerAdapter(list, MainActivity.this);listView.setAdapter(adapter);//判斷一下是否顯示更多按鈕if(pageIndex == pageCount){listView.removeFooterView(footer);}else if(pageIndex < pageCount){//設置tvmsg顯示，加載動畫不顯示
                    tvMsg.setVisibility(View.VISIBLE);loading.setVisibility(View.GONE);}}else{//直接調用方法更新數據
                adapter.notifyDataSetChanged();if(pageIndex == pageCount){listView.removeFooterView(footer);}else if(pageIndex < pageCount){//設置tvmsg顯示，加載動畫不顯示
                    tvMsg.setVisibility(View.VISIBLE);loading.setVisibility(View.GONE);}}}};@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {//需要分頁，觸摸停止，當前確實還有分頁數據if(is_divPage && scrollState == OnScrollListener.SCROLL_STATE_IDLE && pageIndex < pageCount){pageIndex += 1;//設置請求當前頁碼加1Thread thread = new Thread(runnable);thread.start();}}@Overridepublic void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {//現在 Bug初始情況下向下滑動也能翻頁int lastVisibleItem = firstVisibleItem + visibleItemCount;//當前滑動到最后一項if(lastVisibleItem == totalItemCount && totalItemCount > 0){is_divPage = true;}}
}

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