import java.util.ArrayList;
import com.example.pull.view.MyListView;
import com.example.pull.view.MyListView.OnRefreshListener;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.BaseAdapter;
import android.widget.TextView;
public class MainActivity extends Activity {
MyListView myListView;
ArrayList<String> list=new ArrayList<String>();
Myadapter adapter;
private Handler handler=new Handler(){
public void handleMessage(android.os.Message msg) {
//更新UI
adapter.notifyDataSetChanged();
myListView.completeRefresh();
};
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
initview();
initData();
}
private void initview() {
setContentView(R.layout.activity_main);
myListView=(MyListView) findViewById(R.id.myListView);
}
private void initData() {
for (int i = 0; i < 15; i++) {
list.add("listView原来数据—>"+i);
}
adapter=new Myadapter();
myListView.setAdapter(adapter);
myListView.setOnRefreshListener(new OnRefreshListener() {
@Override
public void onPullRefresh() {
//需要联网请求服务器的数据,然后更新UI
requestDataFromServer(false);
}
@Override
public void onLoadingMore() {
requestDataFromServer(true);
}
});
myListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
System.out.println("点击:"+position);
}
});
}
private void requestDataFromServer(final boolean isLoadingMore){
new Thread(){
public void run(){
SystemClock.sleep(3000);
if(isLoadingMore){
list.add("上拉刷新加载数据—>1");
list.add("上拉刷新加载数据—>2");
list.add("上拉刷新加载数据—>3");
}else{
list.add(0,"下拉刷新的数据");
}
//在UI线程更新UI
handler.sendEmptyMessage(0);
}
}.start();
}
class Myadapter extends BaseAdapter{
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
TextView textView=new TextView(MainActivity.this);
textView.setPadding(20, 20, 20, 20);
textView.setTextSize(18);
textView.setText(list.get(position));
return textView;
}
}
}
package com.example.pull.view;
import java.text.SimpleDateFormat;
import java.util.Date;
import com.example.pull.R;
import android.widget.AbsListView.OnScrollListener;
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.ImageView;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
public class MyListView extends ListView implements OnScrollListener{
private View headerView,footerView;
private ImageView iv;
private ProgressBar pb;
private TextView tv1,tv2;
private int headerHeight,footerHeight;//headerView的高度
private int downY;//获取当前y的高度
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
private int currentState=PULL_REFRESH;//默认下拉刷新状态
private RotateAnimation upAnimation,downAnimation;
private boolean isLoadingMore=false;//当前是否处于加载更多
public MyListView(Context context) {
super(context);
init();
}
public MyListView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public void init(){
setOnScrollListener(this);
initHeaderView();
initRotateAnimation();
initFooterView();
}
//初始化headerView
private void initHeaderView() {
headerView=View.inflate(getContext(), R.layout.layout_header, null);
iv=(ImageView) headerView.findViewById(R.id.imageView);
pb= (ProgressBar) headerView.findViewById(R.id.progressBar);
tv1= (TextView) headerView.findViewById(R.id.textView1);
tv2= (TextView) headerView.findViewById(R.id.textView2);
headerView.measure(0, 0);//通知系统主动测量
headerHeight=headerView.getMeasuredHeight();
headerView.setPadding(0, -headerHeight, 0, 0);
addHeaderView(headerView);
}
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);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
downY=(int) ev.getY();
break;
case MotionEvent.ACTION_MOVE:
if(currentState==REFRESHING){
break;
}
int deltaY=(int) (ev.getY()-downY);
int paddingTop=-headerHeight+deltaY;
if(paddingTop>-headerHeight && getFirstVisiblePosition()==0){
headerView.setPadding(0, paddingTop, 0, 0);
if(paddingTop>=0 && currentState==PULL_REFRESH){
//下拉刷新状态进入松开刷新状态
currentState=RELEASE_REFRESH;
refreshHeaderView();
}else if (paddingTop<0 && currentState==RELEASE_REFRESH) {
//松开刷新状态进入下拉刷新状态
currentState=PULL_REFRESH;
refreshHeaderView();
}
return true;
}
//return true;//拦截TouchMove,不让listView处理,会造成listView无法滑动
break;
case MotionEvent.ACTION_UP:
if(currentState==PULL_REFRESH){
headerView.setPadding(0, -headerHeight, 0, 0);
}else if (currentState==RELEASE_REFRESH) {
headerView.setPadding(0, 0, 0, 0);
currentState=REFRESHING;
refreshHeaderView();
if(listener!=null){
listener.onPullRefresh();
}
}
break;
default:
break;
}
return super.onTouchEvent(ev);
}
// 根据currentState来更新headerView
private void refreshHeaderView(){
switch (currentState) {
case PULL_REFRESH:
tv1.setText("下拉刷新");
iv.startAnimation(downAnimation);
break;
case RELEASE_REFRESH:
tv1.setText("松开刷新");
iv.startAnimation(upAnimation);
break;
case REFRESHING:
tv1.setText("正在刷新...");
iv.clearAnimation();//向上的旋转动画可能没有执行完
iv.setVisibility(View.INVISIBLE);
pb.setVisibility(View.VISIBLE);
break;
default:
break;
}
}
// 完成刷新操作,重置状态,在获取完数据并更新完adapter之后,去在UI线程中调用
public void completeRefresh(){
if(isLoadingMore){
//重置footerView状态
footerView.setPadding(0, -footerHeight, 0, 0);
isLoadingMore=false;
}else{
//重置headerView状态
headerView.setPadding(0, -headerHeight, 0, 0);
currentState=PULL_REFRESH;
iv.setVisibility(View.INVISIBLE);
pb.setVisibility(View.VISIBLE);
tv1.setText("下拉刷新");
tv2.setText("最后刷新:"+getCurrentTime());
pb.setVisibility(View.INVISIBLE);
iv.setVisibility(View.VISIBLE);
}
}
private String getCurrentTime(){
SimpleDateFormat format=new SimpleDateFormat("yyyy-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();
}
//尾部上拉加载
private void initFooterView() {
footerView=View.inflate(getContext(), R.layout.layout_footer, null);
footerView.measure(0, 0);//通知系统主动测量
footerHeight=footerView.getMeasuredHeight();
footerView.setPadding(0, -footerHeight, 0, 0);
addFooterView(footerView);
}
@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);//显示出加载更多
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) {
}
}
删除 case MotionEvent.ACTION_MOVE:中return true;