AndroID ListVIEw数据的分批显示
布局文件activity_call_safe2.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" > <relativeLayout androID:layout_wIDth="match_parent" androID:layout_height="wrap_content" > <TextVIEw androID:text="黑名单管理" /> <button androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:layout_alignParentRight="true" androID:text="添加" /> </relativeLayout> <FrameLayout androID:layout_wIDth="match_parent" androID:layout_height="match_parent" androID:layout_weight="11" > <linearLayout androID:ID="@+ID/ll_pb" androID:layout_wIDth="match_parent" androID:layout_height="wrap_content" androID:gravity="center" androID:visibility="invisible" androID:orIEntation="vertical" > <Progressbar androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" /> <TextVIEw androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:text="玩命加载中..." /> </linearLayout> <include androID:ID="@+ID/List_vIEw_callsafe" layout="@layout/List_vIEw_callsafe"/> </FrameLayout></linearLayout>逻辑文件，实现页面的分页显示，监听ListVIEw的滑动事件，滑动的时候就更新数据@H_404_6@CasllSafeActivity.java
package com.lDW.safe.Activity;import java.util.List;import androID.app.Activity;import androID.content.Context;import androID.os.Bundle;import androID.os.Handler;import androID.os.Message;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.EditText;import androID.Widget.ImageVIEw;import androID.Widget.linearLayout;import androID.Widget.ListVIEw;import androID.Widget.TextVIEw;import androID.Widget.Toast;import com.lDW.safe.R;import com.lDW.safe.adapter.MyBaseAdapter;import com.lDW.safe.bean.BlackNumberInfo;import com.lDW.safe.db.dao.BlackNumberDao;public class CallSafeActivity extends Activity { private ListVIEw List_vIEw_callsafe; private List<BlackNumberInfo> blackNumberInfos; private linearLayout ll_pb; private BlackNumberDao dao; private CallSafeAdapter adapter; private int totalNumber;//总的条数 private int mStartIndex = 0;//开始加载的位置 private int maxCount = 20;//每页加载多少数据 @OverrIDe protected voID onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentVIEw(R.layout.activity_call_safe2); initUi(); initData(); } //初始化数据 private Handler handler = new Handler(){ @OverrIDe public voID handleMessage(Message msg) { //数据初始化结束，关闭家在全的展示 ll_pb.setVisibility(VIEw.INVISIBLE); //防止适配器一直刷新 if(adapter == null){ adapter = new CallSafeAdapter(blackNumberInfos,CallSafeActivity.this); //配置适配器 List_vIEw_callsafe.setAdapter(adapter); }else{ adapter.notifyDataSetChanged(); } } }; private EditText et_page_number; //初始化数据 private voID initData() { //防止阻塞主线程，在子线程中初始化数据（后期数据会很多） new Thread(){ @OverrIDe public voID run(){ dao = new BlackNumberDao(CallSafeActivity.this); //一共有多少条数据 totalNumber = dao.getTotalNumber(); //分批加载数据 if(blackNumberInfos == null){ //第一次加载 blackNumberInfos = dao.findPar2(mStartIndex,maxCount); }else{ //把后面的数据。追加到blackNumberInfos集合里面。防止黑名单被覆盖 blackNumberInfos.addAll(dao.findPar2(mStartIndex,maxCount)); } handler.sendEmptyMessage(0); } }.start(); } //初始化UI private voID initUi() { ll_pb = (linearLayout) findVIEwByID(R.ID.ll_pb); //初始化的时候展示加载的圆圈 ll_pb.setVisibility(VIEw.VISIBLE); List_vIEw_callsafe = (ListVIEw) findVIEwByID(R.ID.List_vIEw_callsafe); //设置ListVIEw的滚动监听器 List_vIEw_callsafe.setonScrollListener(new OnScrollListener(){ //状态改变时候回调的方法 /* * @param scrollState 表示滚动的状态 *AbsListVIEw.OnScrollListener.SCRolL_STATE_IDLE 闲置状态 *AbsListVIEw.OnScrollListener.SCRolL_STATE_touch_SCRolL 手指触摸的时候的状态 *AbsListVIEw.OnScrollListener.SCRolL_STATE_FliNG 惯性 */ @OverrIDe public voID onScrollStateChanged(AbsListVIEw vIEw,int scrollState) { switch (scrollState) { case AbsListVIEw.OnScrollListener.SCRolL_STATE_IDLE: //获取到最后一条显示的数据条数 int lastVisibleposition = List_vIEw_callsafe.getLastVisibleposition(); System.out.println("lastVisibleposition==========" + lastVisibleposition); if(lastVisibleposition == blackNumberInfos.size() - 1){//判断最后一个数据是不是每页显示的数据-1 // 加载更多的数据。 更改加载数据的开始位置 mStartIndex += maxCount; if (mStartIndex >= totalNumber) { Toast.makeText(getApplicationContext(),"没有更多的数据了。",Toast.LENGTH_SHORT).show(); return; } initData(); } break; } } //ListvIEw滚动的时候调用的方法 //时时调用。当我们的手指触摸的屏幕的时候就调用 @OverrIDe public voID onScroll(AbsListVIEw vIEw,int firstVisibleItem,int visibleItemCount,int totalitemCount) { // Todo auto-generated method stub } }); } //对代码进行优化，继承自定义MyBaseAdapter，MyBaseAdapter继承自BaseAdapter封装一些常用的方法 private class CallSafeAdapter extends MyBaseAdapter<BlackNumberInfo>{ private CallSafeAdapter(List Lists,Context mContext){ super(Lists,mContext); } @OverrIDe public VIEw getVIEw(int position,VIEw convertVIEw,VIEwGroup parent) { //谷歌推出的优化方案 VIEwHolder holder; if(convertVIEw == null){ convertVIEw = VIEw.inflate(CallSafeActivity.this,R.layout.item_call_safe,null); holder = new VIEwHolder(); holder.tv_number = (TextVIEw) convertVIEw.findVIEwByID(R.ID.tv_number); holder.tv_mode = (TextVIEw) convertVIEw.findVIEwByID(R.ID.tv_mode); holder.iv_delete = (ImageVIEw) convertVIEw.findVIEwByID(R.ID.iv_delete); convertVIEw.setTag(holder); }else{ holder = (VIEwHolder) convertVIEw.getTag(); } holder.tv_number.setText(Lists.get(position).getNumber()); String mode = Lists.get(position).getMode(); if(mode.equals("1")){ holder.tv_mode.setText("电话和短信拦截"); }else if(mode.equals("2")){ holder.tv_mode.setText("电话拦截"); }else if(mode.equals("3")){ holder.tv_mode.setText("短信拦截"); } final BlackNumberInfo info = Lists.get(position); //监听删除数据按钮，删除数据 holder.iv_delete.setonClickListener(new OnClickListener(){ @OverrIDe public voID onClick(VIEw v) { String number = info.getNumber(); boolean result = dao.delete(number); if(result){ Toast.makeText(CallSafeActivity.this,"删除成功",Toast.LENGTH_SHORT).show(); Lists.remove(info); //更新ListVIEw adapter.notifyDataSetChanged(); }else{ Toast.makeText(CallSafeActivity.this,"删除失败",Toast.LENGTH_SHORT).show(); } } }); return convertVIEw; /* //谷歌推出的优化方案 VIEwHolder holder; if(convertVIEw == null){ convertVIEw = VIEw.inflate(CallSafeActivity.this,null); holder = new VIEwHolder(); holder.tv_number = (TextVIEw) convertVIEw.findVIEwByID(R.ID.tv_number); holder.tv_mode = (TextVIEw) convertVIEw.findVIEwByID(R.ID.tv_mode); convertVIEw.setTag(holder); }else{ holder = (VIEwHolder) convertVIEw.getTag(); } holder.tv_number.setText(blackNumberInfos.get(position).getNumber()); String mode = blackNumberInfos.get(position).getMode(); if(mode.equals("1")){ holder.tv_mode.setText("电话和短信拦截"); }else if(mode.equals("2")){ holder.tv_mode.setText("电话拦截"); }else if(mode.equals("3")){ holder.tv_mode.setText("短信拦截"); } return convertVIEw; */ /*初步的优化 convertVIEw = VIEw.inflate(CallSafeActivity.this,null); TextVIEw tv_number = (TextVIEw) convertVIEw.findVIEwByID(R.ID.tv_number); TextVIEw tv_mode = (TextVIEw) convertVIEw.findVIEwByID(R.ID.tv_mode); tv_number.setText(blackNumberInfos.get(position).getNumber()); String mode = blackNumberInfos.get(position).getMode(); if(mode.equals("1")){ tv_mode.setText("电话和短信拦截"); }else if(mode.equals("2")){ tv_mode.setText("电话拦截"); }else if(mode.equals("3")){ tv_mode.setText("短信拦截"); } return convertVIEw; */ /*传统的方式 VIEw vIEw = VIEw.inflate(CallSafeActivity.this,null); TextVIEw tv_number = (TextVIEw) vIEw.findVIEwByID(R.ID.tv_number); TextVIEw tv_mode = (TextVIEw) vIEw.findVIEwByID(R.ID.tv_mode); tv_number.setText(blackNumberInfos.get(position).getNumber()); String mode = blackNumberInfos.get(position).getMode(); if(mode.equals("1")){ tv_mode.setText("电话和短信拦截"); }else if(mode.equals("2")){ tv_mode.setText("电话拦截"); }else if(mode.equals("3")){ tv_mode.setText("短信拦截"); } return vIEw; */ } } static class VIEwHolder{ TextVIEw tv_number; TextVIEw tv_mode; ImageVIEw iv_delete; }}@H_404_6@以上所述是小编给大家介绍的AndroID ListVIEw数据的分批显示功能，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！
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