package coolbuy360.control;
import coolbuy360.searchhealth.R;
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;
/**
* ����ˢ�¿ؼ�
* @author brokge
* @version 1.0
* @created 2014-3-4
*/
public class PullToRefreshListView extends ListView implements OnScrollListener {
private final static String TAG = "PullToRefreshListView";
// ����ˢ�±�־
private final static int PULL_To_REFRESH = 0;
// �ɿ�ˢ�±�־
private final static int RELEASE_To_REFRESH = 1;
// ����ˢ�±�־
private final static int REFRESHING = 2;
// ˢ����ɱ�־
private final static int DONE = 3;
private LayoutInflater inflater;
private LinearLayout headView;
private TextView tipsTextview;
private TextView lastUpdatedTextView;
private ImageView arrowImageView;
private ProgressBar progressBar;
// �������ü�ͷͼ�궯��Ч��
private RotateAnimation animation;
private RotateAnimation reverseAnimation;
// ���ڱ�֤startY��ֵ��һ��������touch�¼���ֻ����¼һ��
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) {
//���û���Ч��
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("��ʼ�߶ȣ�"+headContentHeight);
//System.out.println("��ʼTopPad��"+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("��ǰ-���¸߶�-ACTION_DOWN-Y��"+startY);
}
break;
case MotionEvent.ACTION_CANCEL://ʧȥ����&ȡ������
case MotionEvent.ACTION_UP:
if (state != REFRESHING) {
if (state == DONE) {
//System.out.println("��ǰ-̧��-ACTION_UP��DONEʲô������");
}
else if (state == PULL_To_REFRESH) {
state = DONE;
changeHeaderViewByState();
//System.out.println("��ǰ-̧��-ACTION_UP��PULL_To_REFRESH-->DONE-������ˢ��״̬��ˢ�����״̬");
}
else if (state == RELEASE_To_REFRESH) {
state = REFRESHING;
changeHeaderViewByState();
onRefresh();
//System.out.println("��ǰ-̧��-ACTION_UP��RELEASE_To_REFRESH-->REFRESHING-���ɿ�ˢ��״̬����ˢ�����״̬");
}
}
isRecored = false;
isBack = false;
break;
case MotionEvent.ACTION_MOVE:
int tempY = (int) event.getY();
//System.out.println("��ǰ-����-ACTION_MOVE Y��"+tempY);
if (!isRecored && firstItemIndex == 0) {
//System.out.println("��ǰ-����-��¼��קʱ��λ�� Y��"+tempY);
isRecored = true;
startY = tempY;
}
if (state != REFRESHING && isRecored) {
// �����ɿ�ˢ����
if (state == RELEASE_To_REFRESH) {
// �����ƣ��Ƶ���Ļ�㹻�ڸ�head�ij̶ȣ�����û��ȫ���ڸ�
if ((tempY - startY < headContentHeight+20)
&& (tempY - startY) > 0) {
state = PULL_To_REFRESH;
changeHeaderViewByState();
//System.out.println("��ǰ-����-ACTION_MOVE��RELEASE_To_REFRESH--��PULL_To_REFRESH-���ɿ�ˢ��״̬ת�䵽����ˢ��״̬");
}
// һ�����Ƶ���
else if (tempY - startY <= 0) {
state = DONE;
changeHeaderViewByState();
//System.out.println("��ǰ-����-ACTION_MOVE��RELEASE_To_REFRESH--��DONE-���ɿ�ˢ��״̬ת�䵽done״̬");
}
// ������������û�����Ƶ���Ļ�����ڸ�head
else {
// ���ý����ر�IJ�����ֻ�ø���paddingTop��ֵ������
}
}
// ��û�е�����ʾ�ɿ�ˢ�µ�ʱ��,DONE������PULL_To_REFRESH״̬
else if (state == PULL_To_REFRESH) {
// ���������Խ���RELEASE_TO_REFRESH��״̬
if (tempY - startY >= headContentHeight+20 && currentScrollState == SCROLL_STATE_TOUCH_SCROLL) {
state = RELEASE_To_REFRESH;
isBack = true;
changeHeaderViewByState();
//System.out.println("��ǰ-����-PULL_To_REFRESH--��RELEASE_To_REFRESH-��done��������ˢ��״̬ת�䵽�ɿ�ˢ��");
}
// ���Ƶ�����
else if (tempY - startY <= 0) {
state = DONE;
changeHeaderViewByState();
//System.out.println("��ǰ-����-PULL_To_REFRESH--��DONE-��Done��������ˢ��״̬ת�䵽done״̬");
}
}
// done״̬��
else if (state == DONE) {
if (tempY - startY > 0) {
state = PULL_To_REFRESH;
changeHeaderViewByState();
//System.out.println("��ǰ-����-DONE--��PULL_To_REFRESH-��done״̬ת�䵽����ˢ��״̬");
}
}
// ����headView��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("��ǰ-����ˢ��PULL_To_REFRESH-TopPad��"+topPadding);
}
// ����headView��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("��ǰ-�ͷ�ˢ��RELEASE_To_REFRESH-TopPad��"+topPadding);
}
}
break;
}
return super.onTouchEvent(event);
}
// ��״̬�ı�ʱ���ø÷������Ը��½���
private 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, "��ǰ״̬���ɿ�ˢ��");
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, "��ǰ״̬������ˢ��");
break;
case REFRESHING:
//System.out.println("ˢ��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, "��ǰ״̬,����ˢ��...");
break;
case DONE:
//System.out.println("���DONE-TopPad��"+(-1 * headContentHeight));
headView.setPadding(headView.getPaddingLeft(), -1 * headContentHeight, headView.getPaddingRight(), headView.getPaddingBottom());
headView.invalidate();
progressBar.setVisibility(View.GONE);
arrowImageView.clearAnimation();
// �˴�����ͼ��
arrowImageView.setImageResource(R.drawable.ic_pulltorefresh_arrow);
tipsTextview.setText(R.string.pull_to_refresh_pull_label);
lastUpdatedTextView.setVisibility(View.VISIBLE);
//Log.v(TAG, "��ǰ״̬��done");
break;
}
}
//���ˢ��
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) {
lastUpdatedTextView.setText(update);
onRefreshComplete();
}
public void onRefreshComplete() {
state = DONE;
changeHeaderViewByState();
}
private void onRefresh() {
if (refreshListener != null) {
refreshListener.onRefresh();
}
}
// ����headView��width��heightֵ
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);
}
}