一、自定义listview
package com.fragment.home;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.RotateAnimation;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import java.text.SimpleDateFormat;
import java.util.Date;
import com.example.virtualaccount.R;
public class CustomRefreshListView extends ListView implements OnScrollListener{
/**
* 头布局
*/
private View headerView;
/**
* 头部布局的高度
*/
private int headerViewHeight;
/**
* 头部旋转的图片
*/
private ImageView iv_arrow;
/**
* 头部下拉刷新时状态的描述
*/
private TextView tv_state;
/**
* 下拉刷新时间的显示控件
*/
private TextView tv_time;
/**
* 底部布局
*/
private View footerView;
/**
* 底部旋转progressbar
*/
private ProgressBar pb_rotate;
/**
* 底部布局的高度
*/
private int footerViewHeight;
/**
* 按下时的Y坐标
*/
private int downY;
private final int PULL_REFRESH = 0;//下拉刷新的状态
private final int RELEASE_REFRESH = 1;//松开刷新的状态
private final int REFRESHING = 2;//正在刷新的状态
/**
* 当前下拉刷新处于的状态
*/
private int currentState = PULL_REFRESH;
/**
* 头部布局在下拉刷新改变时,图标的动画
*/
private RotateAnimation upAnimation,downAnimation;
/**
* 当前是否在加载数据
*/
private boolean isLoadingMore = false;
public CustomRefreshListView(Context context) {
this(context,null);
}
public CustomRefreshListView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init(){
//设置滑动监听
setOnScrollListener(this);
//初始化头布局
initHeaderView();
//初始化头布局中图标的旋转动画
initRotateAnimation();
//初始化为尾布局
initFooterView();
}
/**
* 初始化headerView
*/
private void initHeaderView() {
headerView = View.inflate(getContext(), R.layout.head_custom_listview, null);
iv_arrow = (ImageView) headerView.findViewById(R.id.iv_arrow);
pb_rotate = (ProgressBar) headerView.findViewById(R.id.pb_rotate);
tv_state = (TextView) headerView.findViewById(R.id.tv_state);
tv_time = (TextView) headerView.findViewById(R.id.tv_time);
//测量headView的高度
headerView.measure(0, 0);
//获取高度,并保存
headerViewHeight = headerView.getMeasuredHeight();
//设置paddingTop = -headerViewHeight;这样,该控件被隐藏
headerView.setPadding(0, -headerViewHeight, 0, 0);
//添加头布局
addHeaderView(headerView);
}
/**
* 初始化旋转动画
*/
private void initRotateAnimation() {
upAnimation = new RotateAnimation(0, -180,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
upAnimation.setDuration(300);
upAnimation.setFillAfter(true);
downAnimation = new RotateAnimation(-180, -360,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
downAnimation.setDuration(300);
downAnimation.setFillAfter(true);
}
//初始化底布局,与头布局同理
private void initFooterView() {
footerView = View.inflate(getContext(), R.layout.foot_custom_listview, null);
footerView.measure(0, 0);
footerViewHeight = footerView.getMeasuredHeight();
footerView.setPadding(0, -footerViewHeight, 0, 0);
addFooterView(footerView);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
//获取按下时y坐标
downY = (int) ev.getY();
break;
case MotionEvent.ACTION_MOVE:
if(currentState==REFRESHING){
//如果当前处在滑动状态,则不做处理
break;
}
//手指滑动偏移量
int deltaY = (int) (ev.getY() - downY);
//获取新的padding值
int paddingTop = -headerViewHeight + deltaY;
if(paddingTop>-headerViewHeight && getFirstVisiblePosition()==0){
//向下滑,且处于顶部,设置padding值,该方法实现了顶布局慢慢滑动显现
headerView.setPadding(0, paddingTop, 0, 0);
if(paddingTop>=0 && currentState==PULL_REFRESH){
//从下拉刷新进入松开刷新状态
currentState = RELEASE_REFRESH;
//刷新头布局
refreshHeaderView();
}else if (paddingTop<0 && currentState==RELEASE_REFRESH) {
//进入下拉刷新状态
currentState = PULL_REFRESH;
refreshHeaderView();
}
super.onTouchEvent(ev);
return true;//拦截TouchMove,不让listview处理该次move事件,会造成listview无法滑动
}
break;
case MotionEvent.ACTION_UP:
if(currentState==PULL_REFRESH){
//仍处于下拉刷新状态,未滑动一定距离,不加载数据,隐藏headView
headerView.setPadding(0, -headerViewHeight, 0, 0);
}else if (currentState==RELEASE_REFRESH) {
//滑倒一定距离,显示无padding值的headcView
headerView.setPadding(0, 0, 0, 0);
//设置状态为刷新
currentState = REFRESHING;
//刷新头部布局
refreshHeaderView();
if(listener!=null){
//接口回调加载数据
listener.onPullRefresh();
}
}
break;
}
return super.onTouchEvent(ev);
}
/**
* 根据currentState来更新headerView
*/
private void refreshHeaderView(){
switch (currentState) {
case PULL_REFRESH:
tv_state.setText("下拉刷新");
iv_arrow.startAnimation(downAnimation);
break;
case RELEASE_REFRESH:
tv_state.setText("松开刷新");
iv_arrow.startAnimation(upAnimation);
break;
case REFRESHING:
iv_arrow.clearAnimation();//因为向上的旋转动画有可能没有执行完
iv_arrow.setVisibility(View.INVISIBLE);
pb_rotate.setVisibility(View.VISIBLE);
tv_state.setText("正在刷新...");
break;
}
}
/**
* 完成刷新操作,重置状态,在你获取完数据并更新完adater之后,去在UI线程中调用该方法
*/
public void completeRefresh(){
if(isLoadingMore){
//重置footerView状态
footerView.setPadding(0, -footerViewHeight, 0, 0);
isLoadingMore = false;
}else {
//重置headerView状态
headerView.setPadding(0, -headerViewHeight, 0, 0);
currentState = PULL_REFRESH;
pb_rotate.setVisibility(View.INVISIBLE);
iv_arrow.setVisibility(View.VISIBLE);
tv_state.setText("下拉刷新");
tv_time.setText("最后刷新:"+getCurrentTime());
}
}
/**
* 获取当前系统时间,并格式化
* @return
*/
private String getCurrentTime(){
SimpleDateFormat format = new SimpleDateFormat("yy-MM-dd HH:mm:ss");
return format.format(new Date());
}
private OnRefreshListener listener;
public void setOnRefreshListener(OnRefreshListener listener){
this.listener = listener;
}
public interface OnRefreshListener{
void onPullRefresh();
void onLoadingMore();
}
/**
* SCROLL_STATE_IDLE:闲置状态,就是静止状态
* SCROLL_STATE_TOUCH_SCROLL:手指触摸滑动,就是按着来滑动
* SCROLL_STATE_FLING:快速滑动后松开
*/
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
if(scrollState==OnScrollListener.SCROLL_STATE_IDLE
&& getLastVisiblePosition()==(getCount()-1) &&!isLoadingMore){
isLoadingMore = true;
footerView.setPadding(0, 0, 0, 0);//显示出footerView
setSelection(getCount());//让listview最后一条显示出来
if(listener!=null){
listener.onLoadingMore();
}
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
// TODO Auto-generated method stub
}
}
二、监听listview
listview.setOnRefreshListener(new OnRefreshListener() {
//上啦 刷新,刷新是把集合倒下序,最新的就显示在最上面
@Override
public void onPullRefresh() {
// TODO Auto-generated method stub
page+=1;
FilterSelect("",page);//加载数据方法 用参数page来进行分页和后台协商好一页传几条数据
listview.completeRefresh();
flag=true;
}
//下拉加载 加载延迟设置为1秒
@Override
public void onLoadingMore() {
listview.postDelayed(new Runnable() {
@Override
public void run() {
page+=1;
FilterSelect("",page);
listview.completeRefresh();
}
}, 1000L);
}
});
//发送请求 填充数据
private void FilterSelect(String key,int page){
url=url+"&type="+key+"&page="+page;
System.out.println(url);
StringRequest param=new StringRequest(Method.GET,url,new Response.Listener<String>() {
@Override
public void onResponse(String response) {
// TODO Auto-generated method stub
Gson gson=new Gson();
root=gson.fromJson(response.toString(), GoodsRoot.class);
if(root.status==1)
{
// data=root.data;
// addData=data;
if(flag){
List<GoodsDataBean> data=root.data;
Collections.reverse(data);
addData.addAll(data);
}
else addData.addAll(root.data);
adapter=new GameDetailsAdapter(ProductDetails.this,addData);
listview.setAdapter(adapter);
}
else
Toast.makeText(ProductDetails.this, "暂无最新商品", Toast.LENGTH_SHORT).show();
}
},null);
requestdata.add(param);
url=upurl;
}