Android常用控件之下拉刷新Wifi列表
加入技術交流群
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時候記錄當前位置‘);
}
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, 由下拉刷新狀態，到done狀態);
}
if (state == RELEASE_To_REFRESH) {
state = REFRESHING;
changeHeaderViewByState();
onRefresh();
Log.v(TAG, 由松開刷新狀態，到done狀態);
}
}
isRecored = false;
isBack = false;
break;
case MotionEvent.ACTION_MOVE:
int tempY = (int) event.getY();
if (!isRecored firstItemIndex == 0) {
Log.v(TAG, 在move時候記錄下位置);
isRecored = true;
startY = tempY;
}
if (state != REFRESHING isRecored state != LOADING) {
// 保證在設置padding的過程中，當前的位置一直是在head，否則如果當列表超出屏幕的話，當在上推的時候，列表會同時進行滾動
// 可以松手去刷新了
if (state == RELEASE_To_REFRESH) {
setSelection(0);
// 往上推了，推到了屏幕足夠掩蓋head的程度，但是還沒有推到全部掩蓋的地步
if (((tempY - startY) / RATIO headContentHeight)
(tempY - startY) > 0) {
state = PULL_To_REFRESH;
changeHeaderViewByState();
Log.v(TAG, 由松開刷新狀態轉變到下拉刷新狀態);
}
// 一下子推到頂了
else if (tempY - startY = 0) {
state = DONE;
changeHeaderViewByState();
Log.v(TAG, 由松開刷新狀態轉變到done狀態);
}
// 往下拉了，或者還沒有上推到屏幕頂部掩蓋head的地步
else {
// 不用進行特別的操作，只用更新paddingTop的值就行了
}
}
// 還沒有到達顯示松開刷新的時候,DONE或者是PULL_To_REFRESH狀態
if (state == PULL_To_REFRESH) {
setSelection(0);
// 下拉到可以進入RELEASE_TO_REFRESH的狀態
if ((tempY - startY) / RATIO >= headContentHeight) {
state = RELEASE_To_REFRESH;
isBack = true;
changeHeaderViewByState();
Log.v(TAG, 由done或者下拉刷新狀態轉變到松開刷新);
}
// 上推到頂了
else if (tempY - startY = 0) {
state = DONE;
changeHeaderViewByState();
Log.v(TAG, 由DOne或者下拉刷新狀態轉變到done狀態);
}
}
// done狀態下
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);
}
/**
* 當狀態改變時候，調用該方法，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(松開刷新);
Log.v(TAG, 當前狀態，松開刷新);
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狀態轉變來的
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, 當前狀態，下拉刷新);
break;
case REFRESHING:
評論