每次我向上或向下滚动列表时，我都会使用OnScrollListener隐藏（或取消隐藏）某些视图。以下是我ListView附带的代码。
lv.setOnScrollListener(new OnScrollListener() {
private int mLastFirstVisibleItem;
private boolean mIsScrollingUp = true;
private LinearLayout ll = (LinearLayout) getActivity()
.findViewById(R.id.llSearchPlaces);
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
if (view.getId() == lv.getId()) {
final int currentFirstVisibleItem = lv
.getFirstVisiblePosition();
if (currentFirstVisibleItem > mLastFirstVisibleItem) {
if (mIsScrollingUp == true) {
mIsScrollingUp = false;
Log.i("a", "scrolling down...");
floatingActionButton.hide();
Animation animation = new TranslateAnimation(0, 0,
0, 200);
animation.setDuration(300);
animation
.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationEnd(
Animation animation) {
ll.setVisibility(View.INVISIBLE);
}
@Override
public void onAnimationRepeat(
Animation animation) {
}
@Override
public void onAnimationStart(
Animation animation) {
}
});
ll.startAnimation(animation);
}
} else if (currentFirstVisibleItem < mLastFirstVisibleItem) {
if (mIsScrollingUp == false) {
mIsScrollingUp = true;
floatingActionButton.show();
Log.i("a", "scrolling up...");
Animation animation = new TranslateAnimation(0, 0,
200, 0);
animation.setDuration(400);
animation
.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationEnd(
Animation animation) {
}
@Override
public void onAnimationRepeat(
Animation animation) {
}
@Override
public void onAnimationStart(
Animation animation) {
ll.setVisibility(View.VISIBLE);
}
});
ll.startAnimation(animation);
}
}
mLastFirstVisibleItem = currentFirstVisibleItem;
}
}
});
布局：
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swipe_refresh_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ListView
android:id="@id/android:list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fadeScrollbars="true"
android:listSelector="#00000000"
android:scrollbars="none" />
</android.support.v4.widget.SwipeRefreshLayout>
自从我添加了SwipeRefreshLayout之后，当我在上面的监听器中Log时，我什么都得不到。我怎样才能同时使用这两个项目？
编辑：似乎this是我需要的，但我无法让它继续工作
作为该文章的一部分，我在onScroll中添加了此内容，但它似乎无效。
if (firstVisibleItem == 0) {
swipeLayout.setEnabled(true);
} else {
swipeLayout.setEnabled(false);
}
EDIT2 ：这是问题的核心：似乎onScroll方法会在“活动”首次启动并且列表加载后再次启动时再触发。
答案 0 :(得分：4)
我在RecyclerView和ListView时遇到了同样的问题。无论向下滚动任何数量的项目，都无法返回到列表的顶部。
这将禁用SwipeRefreshLayout，直到第一个可见项目或任何项目位置可见。您还可以沿此绑定不同的滚动侦听器。确保在重新填充listivew时启用（如果先前已禁用）SwipeRefreshLayout。
public class SwipeRefreshLayoutToggleScrollListenerListView implements AbsListView.OnScrollListener {
private List<AbsListView.OnScrollListener> mScrollListeners = new ArrayList<AbsListView.OnScrollListener>();
private int mExpectedVisiblePosition = 0;
public SwipeRefreshLayoutToggleScrollListenerListView(SwipeRefreshLayout mSwipeLayout) {
this.mSwipeLayout = mSwipeLayout;
}
private SwipeRefreshLayout mSwipeLayout;
public void addScrollListener(AbsListView.OnScrollListener listener){
mScrollListeners.add(listener);
}
public boolean removeScrollListener(AbsListView.OnScrollListener listener){
return mScrollListeners.remove(listener);
}
public void setExpectedFirstVisiblePosition(int position){
mExpectedVisiblePosition = position;
}
private void notifyOnScrolled(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount){
for(AbsListView.OnScrollListener listener : mScrollListeners){
listener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
}
}
private void notifyScrollStateChanged(AbsListView view, int scrollState){
for(AbsListView.OnScrollListener listener : mScrollListeners){
listener.onScrollStateChanged(view, scrollState);
}
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
notifyScrollStateChanged(view, scrollState);
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
notifyOnScrolled(view, firstVisibleItem, visibleItemCount, totalItemCount);
if(firstVisibleItem != RecyclerView.NO_POSITION)
mSwipeLayout.setEnabled(firstVisibleItem == mExpectedVisiblePosition);
}
}
编辑：
lv.setOnScrollListener(new SwipeRefreshLayoutToggleScrollListenerListView(mSwiperLayout){
//override methods here, don't forget the super calls.
});
答案 1 :(得分：3)
您应该覆盖SwipeRefreshView的{{3}}。轮询此方法是为了了解包含的View是否要向上滚动：
包含任意arbritrary视图的可设置界面的扩展名：
public class SwipeRefreshWrapper extends SwipeRefreshLayout {
private ScrollResolver mScrollResolver;
public SwipeRefreshWrapper(Context context) {
super(context);
}
public SwipeRefreshWrapper(Context context, AttributeSet attrs) {
super(context, attrs);
}
public void setScrollResolver(ScrollResolver scrollResolver) {
mScrollResolver = scrollResolver;
}
@Override
public boolean canChildScrollUp() {
if(mScrollResolver != null){
return mScrollResolver.canScrollUp();
}else {
return super.canChildScrollUp();
}
}
public static interface ScrollResolver{
public boolean canScrollUp();
}
}
用法（ListView也有一个不错的方法：canScrollVertically()）：
final SwipeRefreshWrapper wrapper = (SwipeRefreshWrapper) rootView.findViewById(R.id.wrapper);
final ListView list = (ListView) rootView.findViewById(R.id.list);
wrapper.setScrollResolver(new SwipeRefreshWrapper.ScrollResolver() {
@Override
public boolean canScrollUp() {
return list.canScrollVertically(-1);
}
});
答案 2 :(得分：2)
yourListview.setOnScrollListener(new OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
boolean enable = false;
if(timelogListView != null && timelogListView.getChildCount() > 0){
boolean firstItemVisible = timelogListView.getFirstVisiblePosition() == 0;
boolean topOfFirstItemVisible = timelogListView.getChildAt(0).getTop() == 0;
enable = firstItemVisible && topOfFirstItemVisible;
}
swipeLayout.setEnabled(enable);
if(firstVisibleItem+visibleItemCount == totalItemCount && totalItemCount!=0)
{
if(flag_loading == false)
{
flag_loading = true;
ConnectionDetector conn = new ConnectionDetector(getActivity());
if(conn.isConnectingToInternet()){
// call for your pagination async
}else{
}
}
}
}
});