listView分页和listview下拉刷新

最新推荐文章于 2021-05-25 20:56:52 发布

原创最新推荐文章于 2021-05-25 20:56:52 发布 · 369 阅读

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一、建立底部的布局文件

<?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" >

    <LinearLayout
        android:id="@+id/load_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="horizontal"
        android:paddingBottom="10dip"
        android:paddingTop="10dip" >

        <ProgressBar
            style="?android:attr/progressBarStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

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

</LinearLayout>

继承listView

package com.imooc.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.imooc.load.R;

public class 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 LoadListView(Context context) {
		super(context);
		// TODO Auto-generated constructor stub
		initView(context);
	}

	public LoadListView(Context context, AttributeSet attrs) {
		super(context, attrs);
		// TODO Auto-generated constructor stub
		initView(context);
	}

	public LoadListView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		// TODO Auto-generated constructor stub
		initView(context);
	}

	/**
	 * 添加底部加载提示布局到listview
	 * 
	 * @param context
	 */
	private void initView(Context context) {
		LayoutInflater inflater = LayoutInflater.from(context);
		footer = inflater.inflate(R.layout.footer_layout, null);
		footer.findViewById(R.id.load_layout).setVisibility(View.GONE);
		this.addFooterView(footer);
		this.setOnScrollListener(this);//设置滚动监听
	}
//firstVisibleItem第一个可见item的位置，visibleItemCount可见item的数量，totalItemCount item的总数量
	@Override
	public void onScroll(AbsListView view, int firstVisibleItem,
			int visibleItemCount, int totalItemCount) {
		// TODO Auto-generated method stub
		this.lastVisibleItem = firstVisibleItem + visibleItemCount;//最后一个可见item的位置
		this.totalItemCount = totalItemCount;
	}

	@Override
	public void onScrollStateChanged(AbsListView view, int scrollState) {
		// TODO Auto-generated method stub
//		可见item数量等于总数量且停止滚动时，为已到底部
		if (totalItemCount == lastVisibleItem
				&& scrollState == SCROLL_STATE_IDLE) {
			if (!isLoading) {
				isLoading = true;
				footer.findViewById(R.id.load_layout).setVisibility(
						View.VISIBLE);
				// 加载更多
				iLoadListener.onLoad();
			}
		}
	}
	/**
	 * 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();
	}
}

实体类

package com.imooc.entity;

public class ApkEntity {
	private String name;
	private String des;
	private String info;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getDes() {
		return des;
	}
	public void setDes(String des) {
		this.des = des;
	}
	public String getInfo() {
		return info;
	}
	public void setInfo(String info) {
		this.info = info;
	}
	
}

adapter实现

package com.imooc.adapter;

import java.util.ArrayList;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.imooc.entity.ApkEntity;
import com.imooc.load.R;

public class MyAdapter extends BaseAdapter {
	ArrayList<ApkEntity> apk_list;
	LayoutInflater inflater;

	public MyAdapter(Context context, ArrayList<ApkEntity> apk_list) {
		this.apk_list = apk_list;
		this.inflater = LayoutInflater.from(context);
	}
//新增数据时通知更新listview的UI
	public void onDateChange(ArrayList<ApkEntity> apk_list) {
		this.apk_list = apk_list;
		this.notifyDataSetChanged();
	}

	@Override
	public int getCount() {
		// TODO Auto-generated method stub
		return apk_list.size();
	}

	@Override
	public Object getItem(int position) {
		// TODO Auto-generated method stub
		return apk_list.get(position);
	}

	@Override
	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
		ApkEntity entity = apk_list.get(position);
		ViewHolder holder;
		if (convertView == null) {
			holder = new ViewHolder();
			convertView = inflater.inflate(R.layout.item_layout, null);
			holder.name_tv = (TextView) convertView
					.findViewById(R.id.item3_apkname);
			holder.des_tv = (TextView) convertView
					.findViewById(R.id.item3_apkdes);
			holder.info_tv = (TextView) convertView
					.findViewById(R.id.item3_apkinfo);
			convertView.setTag(holder);
		}else{
			holder = (ViewHolder) convertView.getTag();
		}
		holder.name_tv.setText(entity.getName());
		holder.des_tv.setText(entity.getDes());
		holder.info_tv.setText(entity.getInfo());
		return convertView;
	}

	class ViewHolder {
		TextView name_tv;
		TextView des_tv;
		TextView info_tv;
	}
}

主页面代码

package com.imooc.load;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;

import com.imooc.adapter.MyAdapter;
import com.imooc.entity.ApkEntity;
import com.imooc.view.LoadListView;
import com.imooc.view.LoadListView.ILoadListener;

public class MainActivity extends Activity implements ILoadListener{
	ArrayList<ApkEntity> apk_list = new ArrayList<ApkEntity>();

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		getData();
		showListView(apk_list);
	}

	MyAdapter adapter;
	LoadListView listview;
	private void showListView(ArrayList<ApkEntity> apk_list) {
		if (adapter == null) {
			listview = (LoadListView) findViewById(R.id.listview);
			listview.setInterface(this);
			adapter = new MyAdapter(this, apk_list);
			listview.setAdapter(adapter);
		} else {
			adapter.onDateChange(apk_list);
		}
	}

	private void getData() {
		for (int i = 0; i < 10; i++) {
			ApkEntity entity = new ApkEntity();
			entity.setName("测试程序");
			entity.setInfo("50w用户");
			entity.setDes("这是一个神奇的应用！");
			apk_list.add(entity);
		}
	}
	private void getLoadData() {
		for (int i = 0; i < 2; i++) {
			ApkEntity entity = new ApkEntity();
			entity.setName("更多程序");
			entity.setInfo("50w用户");
			entity.setDes("这是一个神奇的应用！");
			apk_list.add(entity);
		}
	}
//正常情况下不用使用handler，直接更新UI即可
	@Override
	public void onLoad() {
		// TODO Auto-generated method stub
		Handler handler = new Handler();
		handler.postDelayed(new Runnable() {
			
			@Override
			public void run() {
				// TODO Auto-generated method stub
				//获取更多数据
				getLoadData();
				//更新listview显示；
				showListView(apk_list);
				//通知listview加载完毕，隐藏加载的布局
				listview.loadComplete();
			}
		}, 2000);
	}
}

listview 下拉刷新实例

新建头部的布局文件header_layout.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="wrap_content"
    android:orientation="vertical" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingBottom="10dip"
        android:paddingTop="10dip" >

        <LinearLayout
            android:id="@+id/layout"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:gravity="center"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/tip"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="下拉可以刷新！" />

            <TextView
                android:id="@+id/lastupdate_time"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </LinearLayout>

        <ImageView
            android:id="@+id/arrow"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toLeftOf="@id/layout"
            android:layout_marginRight="20dip"
            android:src="@drawable/pull_to_refresh_arrow" />

        <ProgressBar
            android:id="@+id/progress"
            style="?android:attr/progressBarStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toLeftOf="@id/layout"
            android:layout_marginRight="20dip"
            android:visibility="gone" />
    </RelativeLayout>

</LinearLayout>

将布局文件添加到listview中，继承listview