package com.mzeat.ui.widget;
import java.text.SimpleDateFormat;
import java.util.Date;
import com.mzeat.R;
import com.mzeat.util.StringUtils;
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;
/**
* 下拉刷新控件
* @author liux (http://my.oschina.net/liux)
* @version 1.0
* @created 2012-3-21
*/
public class PullToRefreshListView extends ListView implements OnScrollListener {
private final static String TAG = "PullToRefreshListView";
// 下拉刷新标志
private final static int PULL_To_REFRESH = 0;
// 松开刷新标志
private final static int RELEASE_To_REFRESH = 1;
// 正在刷新标志
private final static int REFRESHING = 2;
// 刷新完成标志
private final static int DONE = 3;
private LayoutInflater inflater;
private LinearLayout headView;
private TextView tipsTextview;
private TextView lastUpdatedTextView;
private ImageView arrowImageView;
private ProgressBar progressBar;
// 用来设置箭头图标动画效果
private RotateAnimation animation;
private RotateAnimation reverseAnimation;
// 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 int headContentWidth;
private int headContentHeight;
private int headContentOriginalTopPadding;
private int startY;
private int firstItemIndex;
private int currentScrollState;
private int state;
private boolean isBack;
public OnRefreshListener refreshListener;
public PullToRefreshListView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public PullToRefreshListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
private void init(Context context) {
//设置滑动效果
animation = new RotateAnimation(0, -180,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
animation.setInterpolator(new LinearInterpolator());
animation.setDuration(100);
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(100);
reverseAnimation.setFillAfter(true);
inflater = LayoutInflater.from(context);
headView = (LinearLayout) inflater.inflate(R.layout.pull_to_refresh_head, null);
arrowImageView = (ImageView) headView.findViewById(R.id.head_arrowImageView);
arrowImageView.setMinimumWidth(50);
arrowImageView.setMinimumHeight(50);
progressBar = (ProgressBar) headView.findViewById(R.id.head_progressBar);
tipsTextview = (TextView) headView.findViewById(R.id.head_tipsTextView);
lastUpdatedTextView = (TextView) headView.findViewById(R.id.head_lastUpdatedTextView);
headContentOriginalTopPadding = headView.getPaddingTop();
measureView(headView);
headContentHeight = headView.getMeasuredHeight();
headContentWidth = headView.getMeasuredWidth();
headView.setPadding(headView.getPaddingLeft(), -1 * headContentHeight, headView.getPaddingRight(), headView.getPaddingBottom());
headView.invalidate();
//System.out.println("初始高度："+headContentHeight);
//System.out.println("初始TopPad："+headContentOriginalTopPadding);
addHeaderView(headView);
setOnScrollListener(this);
}
public void onScroll(AbsListView view, int firstVisiableItem, int visibleItemCount, int totalItemCount) {
firstItemIndex = firstVisiableItem;
}
public void onScrollStateChanged(AbsListView view, int scrollState) {
currentScrollState = scrollState;
}
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (firstItemIndex == 0 && !isRecored) {
startY = (int) event.getY();
isRecored = true;
//System.out.println("当前-按下高度-ACTION_DOWN-Y："+startY);
}
break;
case MotionEvent.ACTION_CANCEL://失去焦点&取消动作
case MotionEvent.ACTION_UP:
if (state != REFRESHING) {
if (state == DONE) {
//System.out.println("当前-抬起-ACTION_UP：DONE什么都不做");
}
else if (state == PULL_To_REFRESH) {
state = DONE;
changeHeaderViewByState();
//System.out.println("当前-抬起-ACTION_UP：PULL_To_REFRESH-->DONE-由下拉刷新状态到刷新完成状态");
}
else if (state == RELEASE_To_REFRESH) {
state = REFRESHING;
changeHeaderViewByState();
onRefresh();
//System.out.println("当前-抬起-ACTION_UP：RELEASE_To_REFRESH-->REFRESHING-由松开刷新状态，到刷新完成状态");
}
}
isRecored = false;
isBack = false;
break;
case MotionEvent.ACTION_MOVE:
int tempY = (int) event.getY();
//System.out.println("当前-滑动-ACTION_MOVE Y："+tempY);
if (!isRecored && firstItemIndex == 0) {
//System.out.println("当前-滑动-记录拖拽时的位置 Y："+tempY);
isRecored = true;
startY = tempY;
}
if (state != REFRESHING && isRecored) {
// 可以松开刷新了
if (state == RELEASE_To_REFRESH) {
// 往上推，推到屏幕足够掩盖head的程度，但还没有全部掩盖
if ((tempY - startY < headContentHeight+20)
&& (tempY - startY) > 0) {
state = PULL_To_REFRESH;
changeHeaderViewByState();
//System.out.println("当前-滑动-ACTION_MOVE：RELEASE_To_REFRESH--》PULL_To_REFRESH-由松开刷新状态转变到下拉刷新状态");
}
// 一下子推到顶
else if (tempY - startY <= 0) {
state = DONE;
changeHeaderViewByState();
//System.out.println("当前-滑动-ACTION_MOVE：RELEASE_To_REFRESH--》DONE-由松开刷新状态转变到done状态");
}
// 往下拉，或者还没有上推到屏幕顶部掩盖head
else {
// 不用进行特别的操作，只用更新paddingTop的值就行了
}
}
// 还没有到达显示松开刷新的时候,DONE或者是PULL_To_REFRESH状态
else if (state == PULL_To_REFRESH) {
// 下拉到可以进入RELEASE_TO_REFRESH的状态
if (tempY - startY >= headContentHeight+20 && currentScrollState == SCROLL_STATE_TOUCH_SCROLL) {
state = RELEASE_To_REFRESH;
isBack = true;
changeHeaderViewByState();
//System.out.println("当前-滑动-PULL_To_REFRESH--》RELEASE_To_REFRESH-由done或者下拉刷新状态转变到松开刷新");
}
// 上推到顶了
else if (tempY - startY <= 0) {
state = DONE;
changeHeaderViewByState();
//System.out.println("当前-滑动-PULL_To_REFRESH--》DONE-由Done或者下拉刷新状态转变到done状态");
}
}
// done状态下
else if (state == DONE) {
if (tempY - startY > 0) {
state = PULL_To_REFRESH;
changeHeaderViewByState();
//System.out.println("当前-滑动-DONE--》PULL_To_REFRESH-由done状态转变到下拉刷新状态");
}
}
// 更新headView的size
if (state == PULL_To_REFRESH) {
int topPadding = (int)((-1 * headContentHeight + (tempY - startY)));
headView.setPadding(headView.getPaddingLeft(), topPadding, headView.getPaddingRight(), headView.getPaddingBottom());
headView.invalidate();
//System.out.println("当前-下拉刷新PULL_To_REFRESH-TopPad："+topPadding);
}
// 更新headView的paddingTop
if (state == RELEASE_To_REFRESH) {
int topPadding = (int)((tempY - startY - headContentHeight));
headView.setPadding(headView.getPaddingLeft(), topPadding, headView.getPaddingRight(), headView.getPaddingBottom());
headView.invalidate();
//System.out.println("当前-释放刷新RELEASE_To_REFRESH-TopPad："+topPadding);
}
}
break;
}
return super.onTouchEvent(event);
}
// 当状态改变时候，调用该方法，以更新界面
public void changeHeaderViewByState() {
switch (state) {
case RELEASE_To_REFRESH:
arrowImageView.setVisibility(View.VISIBLE);
progressBar.setVisibility(View.GONE);
tipsTextview.setVisibility(View.VISIBLE);
lastUpdatedTextView.setVisibility(View.VISIBLE);
arrowImageView.clearAnimation();
arrowImageView.startAnimation(animation);
tipsTextview.setText(R.string.pull_to_refresh_release_label);
//Log.v(TAG, "当前状态，松开刷新");
break;
case PULL_To_REFRESH:
progressBar.setVisibility(View.GONE);
tipsTextview.setVisibility(View.VISIBLE);
lastUpdatedTextView.setVisibility(View.VISIBLE);
arrowImageView.clearAnimation();
arrowImageView.setVisibility(View.VISIBLE);
if (isBack) {
isBack = false;
arrowImageView.clearAnimation();
arrowImageView.startAnimation(reverseAnimation);
}
tipsTextview.setText(R.string.pull_to_refresh_pull_label);
//Log.v(TAG, "当前状态，下拉刷新");
break;
case REFRESHING:
//System.out.println("刷新REFRESHING-TopPad："+headContentOriginalTopPadding);
headView.setPadding(headView.getPaddingLeft(), headContentOriginalTopPadding, headView.getPaddingRight(), headView.getPaddingBottom());
headView.invalidate();
progressBar.setVisibility(View.VISIBLE);
arrowImageView.clearAnimation();
arrowImageView.setVisibility(View.GONE);
tipsTextview.setText(R.string.pull_to_refresh_refreshing_label);
lastUpdatedTextView.setVisibility(View.GONE);
//Log.v(TAG, "当前状态,正在刷新...");
break;
case DONE:
//System.out.println("完成DONE-TopPad："+(-1 * headContentHeight));
headView.setPadding(headView.getPaddingLeft(), -1 * headContentHeight, headView.getPaddingRight(), headView.getPaddingBottom());
headView.invalidate();
progressBar.setVisibility(View.GONE);
arrowImageView.clearAnimation();
// 此处更换图标
arrowImageView.setImageResource(R.drawable.ic_pulltorefresh_arrow);
tipsTextview.setText(R.string.pull_to_refresh_pull_label);
lastUpdatedTextView.setVisibility(View.VISIBLE);
//Log.v(TAG, "当前状态，done");
break;
}
}
//点击刷新
public void clickRefresh() {
setSelection(0);
state = REFRESHING;
changeHeaderViewByState();
onRefresh();
}
public void setOnRefreshListener(OnRefreshListener refreshListener) {
this.refreshListener = refreshListener;
}
public interface OnRefreshListener {
public void onRefresh();
}
public void onRefreshComplete(String update) {
SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String date=format.format(new Date());
update = "最近更新:" + StringUtils.friendly_time(date);
lastUpdatedTextView.setText(update);
onRefreshComplete();
}
public void onRefreshComplete() {
state = DONE;
changeHeaderViewByState();
}
public void onRefresh() {
if (refreshListener != null) {
refreshListener.onRefresh();
}
}
// 计算headView的width及height值
private 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);
}
}