package com.smiling.pulltorefreshlistview;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.content.Context;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.MeasureSpec;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.AbsListView.OnScrollListener;
//自定义ListView类;
public class MyListView extends ListView implements OnScrollListener{
//States;
private final static int PULL_TO_REFRESH=1;
private final static int RELEASE_TO_REFRESH=2;
private final static int LOADING=3;
private final static int DONE=4;
//比率;
private final static int RATE=2;
private int toTop=0;
private LayoutInflater inflater;
private LinearLayout headView;
//组件;
private TextView tipsText;
private TextView lastUpdatedText;
private ImageView arrowImage;
private ProgressBar progressBar;
//旋转动画;
private RotateAnimation animation;
private RotateAnimation reverseAnimation;
//flags
// 用于保证startY的值在一个完整的touch事件中只被记录一次;
private boolean isRecored;
private boolean isBack;
private boolean isRefreshable;
private int headContentWidth;
private int headContentHeight;
private int startY;
private int state;
private int firstItemIndex;
private OnRefreshListener refreshListener;
public MyListView(Context context) {
super(context);
initUI(context);
}
public MyListView(Context context, AttributeSet attrs) {
super(context, attrs);
initUI(context);
}
public MyListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initUI(context);
}
//=====================================================================================================
public void initUI(Context context){
inflater=LayoutInflater.from(context);
this.headView=(LinearLayout)inflater.inflate(R.layout.listview_head_layout,null,false);
this.tipsText=(TextView)headView.findViewById(R.id.listview_head_tips);
this.lastUpdatedText=(TextView)headView.findViewById(R.id.listview_head_updateTime);
this.progressBar=(ProgressBar)headView.findViewById(R.id.listview_head_pBar);
this.arrowImage=(ImageView)headView.findViewById(R.id.listview_head_arrow);
this.measureView(headView);
headContentHeight = headView.getMeasuredHeight();
headContentWidth = headView.getMeasuredWidth();
headView.setPadding(0, -1*headContentHeight, 0, 0);
headView.invalidate();
super.addHeaderView(headView);
super.setOnScrollListener(this);
//animation;
animation = new RotateAnimation(0, -180, //逆时针旋转;
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);
//State=DONE; 无状态;
this.state = DONE;
this.isRefreshable = false;
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {
this.firstItemIndex=firstVisibleItem;
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
//====================================================================================================
public boolean onTouchEvent(MotionEvent e){
if(this.isRefreshable){
switch(e.getAction()){
case MotionEvent.ACTION_DOWN:
if(this.firstItemIndex==0&&!this.isRecored){
this.isRecored=true;
this.startY=(int)e.getY();
}
break;
case MotionEvent.ACTION_UP:
if(state!=MyListView.LOADING){
switch(state){
case MyListView.DONE:
break;
case MyListView.PULL_TO_REFRESH:
state=MyListView.DONE;
this.changeHeaderViewByState();
break;
case MyListView.RELEASE_TO_REFRESH:
state=MyListView.LOADING; //异步;
this.changeHeaderViewByState();
this.onRefresh();
break;
}
}
this.isBack=false;
this.isRecored=false;
break;
case MotionEvent.ACTION_MOVE:
int tempY=(int)e.getY();
if(this.firstItemIndex==0&&!this.isRecored){
this.isRecored=true;
this.startY=tempY;
}
//-------------------------------------------------------------------------------
if(state!=LOADING&&this.isRecored){
//注意是异步加载;
// 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==MyListView.PULL_TO_REFRESH){
setSelection(0);
// 下拉到可以进入RELEASE_TO_REFRESH的状态
if((tempY-startY)/RATE > this.headContentHeight){
state=MyListView.RELEASE_TO_REFRESH;
isBack=true;
this.changeHeaderViewByState();
}else if(tempY-startY<=0){
state=DONE; //恢复DONE状态;
this.changeHeaderViewByState();
}
}
else if(state==MyListView.RELEASE_TO_REFRESH){
setSelection(0);
this.toTop=(tempY-startY)/RATE-this.headContentHeight;
System.out.println("======"+this.toTop+"========");
if(tempY-startY>0&&(tempY-startY)/RATE < this.headContentHeight){
state=MyListView.PULL_TO_REFRESH;
this.changeHeaderViewByState();
}else if(tempY-startY<=0){
state=MyListView.DONE;
this.changeHeaderViewByState();
}
}
else if(state==MyListView.DONE){
if(tempY-startY>0){
state=MyListView.PULL_TO_REFRESH;
this.changeHeaderViewByState();
}
}
//========================//更新界面//==============================================
if(state==MyListView.PULL_TO_REFRESH){
this.headView.setPadding(0, -1*this.headContentHeight+(tempY-startY)/RATE, 0, 0);
}
if(state==MyListView.RELEASE_TO_REFRESH){
this.headView.setPadding(0, (tempY-startY)/RATE-this.headContentHeight, 0, 0);
}
}
break;
}
}
return super.onTouchEvent(e);
}
public void changeHeaderViewByState(){
switch(state){
case PULL_TO_REFRESH:
progressBar.setVisibility(View.GONE);
tipsText.setVisibility(View.VISIBLE);
lastUpdatedText.setVisibility(View.VISIBLE);
arrowImage.clearAnimation();
arrowImage.setVisibility(View.VISIBLE);
// isBack==true表示是由RELEASE_To_REFRESH状态转变来的
if (isBack) {
isBack = false;
arrowImage.startAnimation(reverseAnimation);
tipsText.setText("下拉刷新");
} else {
tipsText.setText("下拉刷新");
}
break;
case RELEASE_TO_REFRESH:
arrowImage.setVisibility(View.VISIBLE);
progressBar.setVisibility(View.GONE);
tipsText.setVisibility(View.VISIBLE);
lastUpdatedText.setVisibility(View.VISIBLE);
arrowImage.clearAnimation();
arrowImage.startAnimation(animation);
tipsText.setText("松开刷新");
break;
case LOADING:
new AsyncMove().execute(this.toTop);
lastUpdatedText.setVisibility(View.VISIBLE);
progressBar.setVisibility(View.VISIBLE);
arrowImage.setVisibility(View.GONE);
arrowImage.clearAnimation();
tipsText.setText("正在加载...");
break;
case DONE:
headView.setPadding(0, -1 * headContentHeight, 0, 0);
progressBar.setVisibility(View.GONE);
lastUpdatedText.setVisibility(View.VISIBLE);
arrowImage.clearAnimation();
arrowImage.setImageResource(R.drawable.arrow);
tipsText.setText("下拉刷新");
break;
}
}
//====================================================================================================
public interface OnRefreshListener{
public void onRefresh();
}
public void setOnRefreshListener(OnRefreshListener onRefreshListener){
this.isRefreshable=true;
this.refreshListener=onRefreshListener;
}
public void onRefreshComplete() {
state=DONE;
lastUpdatedText.setText("最近更新："+new SimpleDateFormat("MM-dd HH:mm").format(new Date(System.currentTimeMillis())));
changeHeaderViewByState();
}
public void onRefresh() {
if (refreshListener!=null) {
refreshListener.onRefresh();
}
}
public void setAdapter(BaseAdapter adapter) {
lastUpdatedText.setText("最近更新:" +new SimpleDateFormat("MM-dd HH:mm").format(new Date(System.currentTimeMillis())));
super.setAdapter(adapter);
}
//==================此方法直接照搬自网络上的一个下拉刷新的demo，此处是“估计”headView的width以及height===============
@SuppressWarnings("deprecation")
public void measureView(View child) {
ViewGroup.LayoutParams p = child.getLayoutParams();
if (p == null) {
p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
}
int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, p.width);
int lpHeight = p.height;
int childHeightSpec;
if (lpHeight > 0) {
childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight,
MeasureSpec.EXACTLY);
} else {
childHeightSpec = MeasureSpec.makeMeasureSpec(0,
MeasureSpec.UNSPECIFIED);
}
child.measure(childWidthSpec, childHeightSpec);
}
//====================================================================================================\
private class AsyncMove extends AsyncTask<Integer,Integer,Void>{
@Override
protected Void doInBackground(Integer... top) {
top[0]=top[0]-50;
while(top[0]>=0){
publishProgress(top[0]);
top[0]=top[0]-50;
try{
Thread.sleep(10);
}catch(Exception e){}
}
return null;
}
protected void onProgressUpdate(Integer...value){
MyListView.this.headView.setPadding(0, value[0], 0, 0);
}
protected void onPostExecute(Void v){
MyListView.this.headView.setPadding(0, 0, 0, 0);
}
}
//====================================================================================================
}
Sumsang S4实测截图如下:
