@Override
public void onScroll(
AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
firstItemIndex = firstVisibleItem;
if (firstItemIndex == 0) {
if (positionListener != null) {
positionListener.hideBackTopButton();
}
} else {
if (positionListener != null) {
positionListener.showBackTopButton();
}
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
if (firstItemIndex == 0 && !isRecored) {
isRecored = true;
startY = (int) ev.getY();
LogUtils.i(TAG, "手指按下去的位置");
}
if (positionListener != null) {
positionListener.backTopButtonFocuse();
}
break;
case MotionEvent.ACTION_MOVE:
int tempY = (int) ev.getY();
if (firstItemIndex == 0 && !isRecored) {
LogUtils.i(TAG, "在手指移动的记录下位置");
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，否则如果当列表超出屏幕的话，当在上推的时候，列表会同时进行滚动
// 可以松手去刷新了
if (state == RELEASE_TO_REFRESH) {
setSelection(0);
// 往上推了，推到了屏幕足够掩盖head的程度，但是还没有推到全部掩盖的地步
if (((tempY - startY) / RATIO < headerHeight) && (tempY - startY) > 0) {
state = PULL_TO_REFRESH;
changeHeaderViewByState();
LogUtils.i(TAG, "由松开刷新状态转变到下拉刷新状态");
} else if (tempY - startY <= 0) { // 一下子推到顶了
state = DONE;
changeHeaderViewByState();
LogUtils.i(TAG, "由松开刷新状态转变到done状态");
}
// 往下拉了，或者还没有上推到屏幕顶部掩盖head的地步
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
if (state == PULL_TO_REFRESH) {
setSelection(0);
// 下拉到可以进入RELEASE_TO_REFRESH的状态
if ((tempY - startY) / RATIO >= headerHeight) {
state = RELEASE_TO_REFRESH;
isBack = true;
changeHeaderViewByState();
LogUtils.i(TAG, "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();
// /Log.v(TAG, "由DOne或者下拉刷新状态转变到done状态");
}
}
// 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) {
header.setPadding(0, -1 * headerHeight + (tempY - startY) / RATIO, 0, 0);
}
// 更新headView 的paddingTop
if (state == RELEASE_TO_REFRESH) {
header.setPadding(0, (tempY - startY) / RATIO - headerHeight, 0, 0);
}
}
break;
case MotionEvent.ACTION_UP:
if (state != REFRESHING && state != LOADING) {
if (state == DONE) {}
if (state == PULL_TO_REFRESH) {
state = DONE;
changeHeaderViewByState();
LogUtils.i(TAG, "由下拉刷新状态,到done状态");
}
if (state == RELEASE_TO_REFRESH) {
state = REFRESHING;
changeHeaderViewByState();
onRefresh();
LogUtils.i(TAG, "由松开刷新状态,到done状态");
}
}
isRecored = false;
isBack = false;
if (positionListener != null) {
positionListener.backTopButtonBlur();
}
break;
default:
break;
}
return super.onTouchEvent(ev);
}
