ListView装上拉电阻下拉刷新

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ListView装上拉电阻下拉刷新

主要用到了这个几个文件。MainActivity是界面的Activity,MyAdapter是ListView的自己定义适配,MyListView是自己定义带头部LIistView，假设仅仅须要上拉载入就不须要；activity_main.xml是住界面。item.xml是ListView的子布局里面仅仅有一个TextView,listview_footer.xml是listview的载入很多其它的底部布局，listview_header.xml是listview的头部布局。

MainActivity.java

package com.example.listview;

import java.util.ArrayList;
import java.util.List;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.Toast;

import com.example.listview.MyListView.OnRefreshListener;

public class MainActivity extends Activity implements OnScrollListener{
	/** ListView*/
	private MyListView listView;
	/** 自己定义的Adapter*/
	private MyAdapter adapter;
	/** 一共的数据*/
	private List<String> list=new ArrayList<String>();
	/** ListView的底部布局*/
	private View footer;

	private Handler handler;
	 
	private int count=0;
	
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		/** 配置好ListView*/
		listView=(MyListView) findViewById(R.id.listView);

		/** 加入底部布局,要在setAdapter前,否则没有效果*/
		footer=LayoutInflater.from(this).inflate(R.layout.listview_footer, null);
		listView.addFooterView(footer);
	
		/** 适配listView*/
		adapter=new MyAdapter(this, list);
		listView.setAdapter(adapter);
		
		/**　加入一个线程设置时间有等待的效果*/
		handler=new Handler();

		listView.setOnScrollListener(this);

		listView.setonRefreshListener(new OnRefreshListener() {

	            @Override
	         public void onRefresh() {
	                new AsyncTask<Void, Void, Void>() {
	                    protected Void doInBackground(Void... params) {
	                        try {
	                            Thread.sleep(1000);
	                        } catch (Exception e) {
	                            e.printStackTrace();
	                        }
	                       // list.add("刷新后加入的内容");
	                        return null;
	                    }

	                    @Override
	                    protected void onPostExecute(Void result) {
	                        adapter.notifyDataSetChanged();
	                        listView.onRefreshComplete();
	                    }
	                }.execute(null, null, null);
	                
	            }
	       });
		 
		setData();  
		
	}

	/**
	 * 底部滚动的监听 
	 */
	@Override
	public void onScrollStateChanged(final AbsListView view, int scrollState) {
		/** 当滚动停止同一时候在底部的时候*/
	     if (scrollState == OnScrollListener.SCROLL_STATE_IDLE && (view.getLastVisiblePosition() == view.getCount() - 1)) {
	    		/** 为了有数据载入等待的时间。假设是网络数据请求，则此处不须要直接请求接口就ok*/
	                handler.postDelayed(new Runnable() {

	                    @Override
	                    public void run() {
	                    	setData();
	                    	/** 让刷新出来的数据从屏幕開始显示,假设不设定位置，listView数据更新后会跑到第一条数据開始显示*/
	                    	listView.setSelection(view.getCount()-1);
	                    }

	                }, 2000);
	                
	     }
	     
	}
	@Override
	public void onScroll(AbsListView arg0, int arg1, int arg2, int arg3) {
	
	}
	/** 放数据,假设你的数据能够分页获取就不须要这样,此处是为了有分页的数据*/
	@SuppressLint("ShowToast")
	private void setData(){
		
		//当数据到达总量的时候移除底部布局
		if(count>50){
			
			listView.removeFooterView(footer);
			
			Toast.makeText(this,"没有很多其它数据", 500).show();
			
			return;
		}
		
		for(int i=count;i<count+10;i++){
			
			
			list.add("数据"+i);
			
		}
		
		count=count+10;
		/** 通知adapter数据改变*/
		adapter.notifyDataSetChanged();
	}
}

MyListView.java

package com.example.listview;
import java.util.Date;
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
/**
* ListView加入刷新头部自己定义的ListView
* 
* @author 刘梓未
* 
*
*/
public class MyListView extends ListView implements OnScrollListener {
private final static int RELEASE_To_REFRESH = 0;// 下拉过程的状态值
private final static int PULL_To_REFRESH = 1; // 从下拉返回到不刷新的状态值
private final static int REFRESHING = 2;// 正在刷新的状态值
private final static int DONE = 3;
private final static int LOADING = 4;
// 实际的padding的距离与界面上偏移距离的比例
private final static int RATIO = 3;
private LayoutInflater inflater;
// ListView头部下拉刷新的布局
private LinearLayout headerView;
private TextView lvHeaderTipsTv;
private TextView lvHeaderLastUpdatedTv;
private ImageView lvHeaderArrowIv;
private ProgressBar lvHeaderProgressBar;
// 定义头部下拉刷新的布局的高度
private int headerContentHeight;
private RotateAnimation animation;
private RotateAnimation reverseAnimation;
private int startY;
private int state;
private boolean isBack;
// 用于保证startY的值在一个完整的touch事件中仅仅被记录一次
private boolean isRecored;
private OnRefreshListener refreshListener;
private boolean isRefreshable;
public MyListView(Context context) {
super(context);
init(context);
}
public MyListView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
private void init(Context context) {
setCacheColorHint(context.getResources().getColor(android.R.color.transparent));
inflater = LayoutInflater.from(context);
headerView = (LinearLayout) inflater.inflate(R.layout.listview_header, null);
lvHeaderTipsTv = (TextView) headerView
.findViewById(R.id.lvHeaderTipsTv);
lvHeaderLastUpdatedTv = (TextView) headerView
.findViewById(R.id.lvHeaderLastUpdatedTv);
lvHeaderArrowIv = (ImageView) headerView
.findViewById(R.id.lvHeaderArrowIv);
// 设置下拉刷新图标的最小高度和宽度
lvHeaderArrowIv.setMinimumWidth(70);
lvHeaderArrowIv.setMinimumHeight(50);
lvHeaderProgressBar = (ProgressBar) headerView
.findViewById(R.id.lvHeaderProgressBar);
measureView(headerView);
headerContentHeight = headerView.getMeasuredHeight();
// 设置内边距，正好距离顶部为一个负的整个布局的高度，正好把头部隐藏
headerView.setPadding(0, -1 * headerContentHeight, 0, 0);
// 重绘一下
headerView.invalidate();
// 将下拉刷新的布局加入ListView的顶部
addHeaderView(headerView, null, false);
// 设置滚动监听事件
setOnScrollListener(this);
// 设置旋转动画事件
animation = new RotateAnimation(0, -180,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
animation.setInterpolator(new LinearInterpolator());
animation.setDuration(250);
animation.setFillAfter(true);
reverseAnimation = new RotateAnimation(-180, 0,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
reverseAnimation.setInterpolator(new LinearInterpolator());
reverseAnimation.setDuration(200);
reverseAnimation.setFillAfter(true);
// 一開始的状态就是下拉刷新完的状态。所以为DONE
state = DONE;
// 是否正在刷新
isRefreshable = false;
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (isRefreshable) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
if (!isRecored) {
isRecored = true;
startY = (int) ev.getY();// 手指按下时记录当前位置
}
break;
case MotionEvent.ACTION_UP:
if (state != REFRESHING && state != LOADING) {
if (state == PULL_To_REFRESH) {
state = DONE;
changeHeaderViewByState();
}
if (state == RELEASE_To_REFRESH) {
state = REFRESHING;
changeHeaderViewByState();
onLvRefresh();
}
}
isRecored = false;
isBack = false;
break;
case MotionEvent.ACTION_MOVE:
int tempY = (int) ev.getY();
if (!isRecored) {
isRecored = true;
startY = tempY;
}
if (state != REFRESHING && isRecored && state != LOADING) {
// 保证在设置padding的过程中，当前的位置一直是在head。否则假设当列表超出屏幕的话，当在上推的时候。列表会同一时候进行滚动
// 能够松手去刷新了
if (state == RELEASE_To_REFRESH) {
setSelection(0);
// 往上推了。推到了屏幕足够掩盖head的程度，可是还没有推到所有掩盖的地步
if (((tempY - startY) / RATIO < headerContentHeight)// 由松开刷新状态转变到下拉刷新状态
&& (tempY - startY) > 0) {
state = PULL_To_REFRESH;
changeHeaderViewByState();
}
// 一下子推到顶了
else if (tempY - startY <= 0) {// 由松开刷新状态转变到done状态
state = DONE;
changeHeaderViewByState();
}
}
// 还没有到达显示松开刷新的时候,DONE或者是PULL_To_REFRESH状态
if (state == PULL_To_REFRESH) {
setSelection(0);
// 下拉到能够进入RELEASE_TO_REFRESH的状态
if ((tempY - startY) / RATIO >= headerContentHeight) {// 由done或者下拉刷新状态转变到松开刷新
state = RELEASE_To_REFRESH;
isBack = true;
changeHeaderViewByState();
}
// 上推到顶了
else if (tempY - startY <= 0) {// 由DOne或者下拉刷新状态转变到done状态
state = DONE;
changeHeaderViewByState();
}
}
// done状态下
if (state == DONE) {
if (tempY - startY > 0) {
state = PULL_To_REFRESH;
changeHeaderViewByState();
}
}
// 更新headView的size
if (state == PULL_To_REFRESH) {
headerView.setPadding(0, -1 * headerContentHeight
+ (tempY - startY) / RATIO, 0, 0);
}
// 更新headView的paddingTop
if (state == RELEASE_To_REFRESH) {
headerView.setPadding(0, (tempY - startY) / RATIO
- headerContentHeight, 0, 0);
}
}
break;
default:
break;
}
}
return super.onTouchEvent(ev);
}
// 当状态改变时候。调用该方法。以更新界面
private void changeHeaderViewByState() {
switch (state) {
case RELEASE_To_REFRESH:
lvHeaderArrowIv.setVisibility(View.VISIBLE);
lvHeaderProgressBar.setVisibility(View.GONE);
lvHeaderTipsTv.setVisibility(View.VISIBLE);
lvHeaderLastUpdatedTv.setVisibility(View.VISIBLE);
lvHeaderArrowIv.clearAnimation();// 清除动画
lvHeaderArrowIv.startAnimation(animation);// 開始动画效果
lvHeaderTipsTv.setText("松开刷新");
break;
case PULL_To_REFRESH:
lvHeaderProgressBar.setVisibility(View.GONE);
lvHeaderTipsTv.setVisibility(View.VISIBLE);
lvHeaderLastUpdatedTv.setVisibility(View.VISIBLE);
lvHeaderArrowIv.clearAnimation();
lvHeaderArrowIv.setVisibility(View.VISIBLE);
// 是由RELEASE_To_REFRESH状态转变来的
if (isBack) {
isBack = false;
lvHeaderArrowIv.clearAnimation();
lvHeaderArrowIv.startAnimation(reverseAnimation);
lvHeaderTipsTv.setText("下拉刷新");
} else {
lvHeaderTipsTv.setText("下拉刷新");
}
break;
case REFRESHING:
headerView.setPadding(0, 0, 0, 0);
lvHeaderProgressBar.setVisibility(View.VISIBLE);
lvHeaderArrowIv.clearAnimation();
lvHeaderArrowIv.setVisibility(View.GONE);
lvHeaderTipsTv.setText("正在刷新...");
lvHeaderLastUpdatedTv.setVisibility(View.VISIBLE);
break;
case DONE:
headerView.setPadding(0, -1 * headerContentHeight, 0, 0);
lvHeaderProgressBar.setVisibility(View.GONE);
lvHeaderArrowIv.clearAnimation();
lvHeaderArrowIv.setImageResource(R.drawable.head_arrow);
lvHeaderTipsTv.setText("下拉刷新");
lvHeaderLastUpdatedTv.setVisibility(View.VISIBLE);
break;
}
}
// 此方法直接照搬自网络上的一个下拉刷新的demo，此处是“预计”headView的width以及height
private void measureView(View child) {
ViewGroup.LayoutParams params = child.getLayoutParams();
if (params == null) {
params = new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
}
int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0,
params.width);
int lpHeight = params.height;
int childHeightSpec;
if (lpHeight > 0) {
childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight,
MeasureSpec.EXACTLY);
} else {
childHeightSpec = MeasureSpec.makeMeasureSpec(0,
MeasureSpec.UNSPECIFIED);
}
child.measure(childWidthSpec, childHeightSpec);
}
public void setonRefreshListener(OnRefreshListener refreshListener) {
this.refreshListener = refreshListener;
isRefreshable = true;
}
public interface OnRefreshListener {
public void onRefresh();
}
@SuppressWarnings("deprecation")
public void onRefreshComplete() {
state = DONE;
lvHeaderLastUpdatedTv.setText("近期更新:" + new Date().toLocaleString());
changeHeaderViewByState();
}
private void onLvRefresh() {
if (refreshListener != null) {
refreshListener.onRefresh();
}
}
}

listview_footer.xml

<?
xml version="1.0" encoding="utf-8"?
><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:gravity="center"    android:layout_marginTop="10dp"    android:orientation="horizontal" >    <ProgressBar         android:id="@+id/footer_progress"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        /></LinearLayout>

listview_header.xml

ListView装上拉电阻下拉刷新

<?xml version="1.0" encoding="utf-8"?>
<!-- ListView的头部 -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<!-- 内容 -->
<RelativeLayout
android:id="@+id/head_contentLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/list_header_bg"
android:paddingLeft="30dp">
<!-- 箭头图像、进度条 -->
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true" >
<!-- 箭头 -->
<ImageView
android:id="@+id/lvHeaderArrowIv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:src="@drawable/head_arrow" />
<!-- 进度条 -->
<ProgressBar
android:id="@+id/lvHeaderProgressBar"
style="?android:attr/progressBarStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:visibility="gone" />
</FrameLayout>
<!-- 提示、近期更新 -->
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:gravity="center_horizontal"
android:orientation="vertical" >
<!-- 提示 -->
<TextView
android:id="@+id/lvHeaderTipsTv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="下拉刷新"
android:textSize="13sp" />
<!-- 近期更新 -->
<TextView
android:id="@+id/lvHeaderLastUpdatedTv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="最新更新"
android:textSize="10sp" />
</LinearLayout>
</RelativeLayout>
</LinearLayout>

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