Android的ListView分页功能-白红宇

Android的ListView分页功能

阅读量：5098 次

发布时间：2019-06-13

本文共 7184 字，大约阅读时间需要 23 分钟。

一、功能分析----ListView“加载更多”,功能如下图所示:

这个效果是当你上拉拖动页面时（注意有区别于下拉刷新），页面提示正在加载，2秒后显示留言更多内容；具体功能知道那我就来讲解下如何实现这个功能。

二、创建自定义ListView及其底部布局footer

①首先做一个加载提示布局，布局footer_layout如下图：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="

android:id="@+id/load_layout"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="horizontal"

android:layout_gravity="center" >

<ProgressBar

android:layout_width="wrap_content"

android:layout_height="wrap_content"

style="?android:attr/progressBarStyleSmall"/>

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="正在加载..." />

</LinearLayout>

②将布局添加至ListView，自定义一个ListView

package com.mg.message.view;

import android.content.Context;

import android.util.AttributeSet;

import android.view.LayoutInflater;

import android.view.View;

import android.widget.AbsListView;

import android.widget.AbsListView.OnScrollListener;

import android.widget.ListView;

import com.mg.message.R;

public class LX_LoadListView extends ListView implements OnScrollListener{

View footer;//底部布局

int totalItemCount;//总数量

int lastVisibleItem;//最后一个可见的Item

boolean isLoading;//正在加载

ILoadListener iLoadListener;

public LX_LoadListView(Context context) {

super(context);

initView(context);

}

public LX_LoadListView(Context context, AttributeSet attrs) {

super(context, attrs);

initView(context);

}

public LX_LoadListView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

initView(context);

}

/**

* 添加底部加载提示布局到listview

* @param context

private void initView(Context context) {

LayoutInflater layoutInflater=LayoutInflater.from(context);

footer=layoutInflater.inflate(R.layout.lx_footer_layout, null);

footer.findViewById(R.id.load_layout).setVisibility(View.GONE);

this.addFooterView(footer);

this.setOnScrollListener(this);

}

@Override

public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)

{

this.lastVisibleItem=firstVisibleItem+visibleItemCount;

this.totalItemCount=totalItemCount;

}

@Override

public void onScrollStateChanged(AbsListView view, int scrollState) {

if (totalItemCount==lastVisibleItem&&scrollState==SCROLL_STATE_IDLE) {

if (!isLoading) {

isLoading=true;

footer.findViewById(R.id.load_layout).setVisibility(View.VISIBLE);

iLoadListener.onLoad();//加载更多数据

}

//加载完毕

public void loadComplete() {

isLoading=false;

footer.findViewById(R.id.load_layout).setVisibility(View.GONE);

}

public void setInterface(ILoadListener iLoadListener) {

this.iLoadListener=iLoadListener;

}

//加载更多数据的回调接口

public interface ILoadListener

{

public void onLoad();

}

三、给ListView设置Adapter并实现接口中的Load方法

①自定义ListView布局，lx_get_content_activity

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

android:layout_marginTop="2dp"

android:layout_marginBottom="2dp"

android:layout_marginLeft="2dp"

android:layout_marginRight="2dp"

android:background="@drawable/edit_normal">

<com.mg.message.view.LX_LoadListView

android:id="@+id/list_content"

android:layout_width="match_parent"

android:background="@drawable/edit_normal"

android:layout_height="0dip"

android:focusable="true"

android:layout_weight="1.20" >

</com.mg.message.view.LX_LoadListView>

</LinearLayout>

②给ListView设置Adapter，并实现接口的Load方法

package com.mg.message.ui;

import java.util.ArrayList;

import java.util.List;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemLongClickListener;

import android.widget.AdapterView.OnItemClickListener;

import com.mg.core.base.BaseActivity;

import com.mg.core.net.OperateCode;

import com.mg.core.net.ThreadMessage;

import com.mg.message.R;

import com.mg.message.data.GetMessageData;

import com.mg.message.domain.Message;

import com.mg.message.ui.adapter.ContentAdapter;

import com.mg.message.utils.ViewUtil;

import com.mg.message.view.LX_LoadListView;

import com.mg.message.view.LX_LoadListView.ILoadListener;

/* * 获得留言*/

public class LX_GetContentActivity extends BaseActivity implements ILoadListener

{

private LX_LoadListView listView;

private List<Message> totalMessages=new ArrayList<Message>();

private static ContentAdapter myAdapter;

private int totalSize;

List<Message> messages=new ArrayList<Message>();

@Override

protected void initEvents()

{

listView.setOnItemClickListener(new OnItemClickListener() //进入删除页

{

@Override

public void onItemClick(AdapterView<?> arg0, View arg1, int position,

long arg3)

{

Bundle bundle = new Bundle(); //传递多参数时使用Bundle

bundle.putString("ID", messages.get(position).getID());

bundle.putString("UContent", messages.get(position).getContent().toString());

bundle.putString("UTime", messages.get(position).getCreateTime());

startCOActivity(LX_DeleteActivity.class,bundle);

finish();

}

});

//修改留言

listView.setOnItemLongClickListener(new OnItemLongClickListener()

{

@Override

public boolean onItemLongClick(AdapterView<?> arg0, View arg1,

int position, long arg3) {

Bundle bundle = new Bundle(); //传递多参数时使用Bundle

bundle.putString("ID", messages.get(position).getID());

startCOActivity(LX_AddMessageActivity.class,bundle);

finish();

return false;

}

});

}

@Override

protected void initViews()

{

setContentView(R.layout.lx_get_content_activity);

mTopBar.setVisibility(View.VISIBLE);

mTopBar.SetTvName("查看留言");

listView=(LX_LoadListView)findViewById(R.id.list_content);

        listView.setInterface(this);
          myAdapter=new ContentAdapter(messages);
          listView.setAdapter(myAdapter);

}

@Override

protected void onResume() {

super.onResume();

showToast("onResume", false);

sendToBackgroud(OperateCode.i_getMessageInfo);

}

@Override

protected void receiveRequest(ThreadMessage threadMessage)

{

hideProgressDialog();

OperateCode operateCode = threadMessage.getOperateCode();

List<Message> messageList;

switch (operateCode)

{ //查看留言

case i_getMessageInfo:

messageList=GetMessageData.getMessagesList();

if(ViewUtil.isNotEmpty(messageList))

{

totalMessages.clear();

messages.clear();

totalMessages.addAll(messageList);

totalSize=totalMessages.size();

getData();

myAdapter.notifyDataSetChanged();

}

break;

default:

break;

}

//listview初始化条数

private void getData()

{

try {

if (totalSize<9) {

messages.addAll(GetMessageData.getMessagesList());

showToast("留言小于9加载完毕", false);

}

else {

messages.addAll(GetMessageData.getMessagesList().subList(0, 8));

}

catch (Exception e) {

}

//加载数据

private void getLoadData()

{

int lastsize=totalSize-messages.size();

if(messages.size()<totalSize)

{

if (lastsize<5) {

messages.clear();

messages.addAll(GetMessageData.getMessagesList());

showToast("加载项<5加载完毕", false);

}

else {

messages.addAll(totalMessages.subList(messages.size(), messages.size()+5));

}

else

{

messages.clear();

messages.addAll(GetMessageData.getMessagesList());

showToast("全部加载完毕", false);

}

myAdapter.notifyDataSetChanged();

}

    @Override
    public void onLoad()
    {
        android.os.Handler handler=new android.os.Handler();
        handler.postDelayed(new Runnable()
        {
            @Override
            public void run() {
                getLoadData();//获取更多数据
                listView.loadComplete();//通知listview加载完毕
            }
        }, 2000);
    }
}

转载于:https://www.cnblogs.com/wucaiyun1/p/4733998.html

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