Android常用控件之下拉刷新Wifi列表
加入技术交流群
isRefreshable = false;
}
@Override
public void onScroll(AbsListView arg0, int firstVisiableItem, int arg2,
int arg3) {
// TODO Auto-generated method stub
firstItemIndex = firstVisiableItem;
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
// TODO Auto-generated method stub
}
public boolean onTouchEvent(MotionEvent event) {
if (isRefreshable) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (firstItemIndex == 0 !isRecored) {
isRecored = true;
startY = (int) event.getY();
Log.v(TAG, 在down时候记录当前位置‘);
}
break;
case MotionEvent.ACTION_UP:
if (state != REFRESHING state != LOADING) {
if (state == DONE) {
// 什么都不做
}
if (state == PULL_To_REFRESH) {
state = DONE;
changeHeaderViewByState();
Log.v(TAG, 由下拉刷新状态，到done状态);
}
if (state == RELEASE_To_REFRESH) {
state = REFRESHING;
changeHeaderViewByState();
onRefresh();
Log.v(TAG, 由松开刷新状态，到done状态);
}
}
isRecored = false;
isBack = false;
break;
case MotionEvent.ACTION_MOVE:
int tempY = (int) event.getY();
if (!isRecored firstItemIndex == 0) {
Log.v(TAG, 在move时候记录下位置);
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 headContentHeight)
(tempY - startY) > 0) {
state = PULL_To_REFRESH;
changeHeaderViewByState();
Log.v(TAG, 由松开刷新状态转变到下拉刷新状态);
}
// 一下子推到顶了
else if (tempY - startY = 0) {
state = DONE;
changeHeaderViewByState();
Log.v(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 >= headContentHeight) {
state = RELEASE_To_REFRESH;
isBack = true;
changeHeaderViewByState();
Log.v(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) {
headView.setPadding(0, -1 * headContentHeight
+ (tempY - startY) / RATIO, 0, 0);
}
// 更新headView的paddingTop
if (state == RELEASE_To_REFRESH) {
headView.setPadding(0, (tempY - startY) / RATIO
- headContentHeight, 0, 0);
}
}
break;
}
}
return super.onTouchEvent(event);
}
/**
* 当状态改变时候，调用该方法，以更新界面
*/
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(松开刷新);
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);
// 是由RELEASE_To_REFRESH状态转变来的
if (isBack) {
isBack = false;
arrowImageView.clearAnimation();
arrowImageView.startAnimation(reverseAnimation);
tipsTextview.setText(下拉刷新);
} else {
tipsTextview.setText(下拉刷新);
}
Log.v(TAG, 当前状态，下拉刷新);
break;
case REFRESHING:
评论