下面列出了androidx.recyclerview.widget.RecyclerView#SCROLL_STATE_IDLE 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
@Override
public void onScrollStateChanged(int state) {
if (mCurrentScrollState == RecyclerView.SCROLL_STATE_IDLE && mCurrentScrollState != state) {
mScrollStateListener.onScrollStart();
}
if (state == RecyclerView.SCROLL_STATE_IDLE) {
//Scroll is not finished until current view is centered
boolean isScrollEnded = onScrollEnd();
if (isScrollEnded) {
mScrollStateListener.onScrollEnd();
} else {
//Scroll continues and we don't want to set mCurrentScrollState to STATE_IDLE,
//because this will then trigger .mScrollStateListener.onScrollStart()
return;
}
} else if (state == RecyclerView.SCROLL_STATE_DRAGGING) {
onDragStart();
}
mCurrentScrollState = state;
}
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
switch (newState) {
case RecyclerView.SCROLL_STATE_IDLE:
int last = ((LinearLayoutManager) recyclerView.getLayoutManager()).findLastCompletelyVisibleItemPosition();
if (NO_POSITION == last) {
break;
}
if (slimAdapter.getItem(last) == this && !loading) {
loadMore();
}
break;
default:
break;
}
}
@Override
public void onScrollStateChanged(int state) {
super.onScrollStateChanged(state);
switch (state) {
case RecyclerView.SCROLL_STATE_DRAGGING:
//当手指按下时，停止当前正在播放的动画
cancelAnimator();
break;
case RecyclerView.SCROLL_STATE_IDLE:
//当列表滚动停止后，判断一下自动选中是否打开
if (isAutoSelect) {
//找到离目标落点最近的item索引
smoothScrollToPosition(findShouldSelectPosition());
}
break;
default:
break;
}
}
@Override
public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == RecyclerView.SCROLL_STATE_IDLE) {
recyclerView.removeOnScrollListener(this);
mIsMoved = false;
mCurrentRVTouched = null;
if (recyclerView == mCellRecyclerView) {
Log.d(LOG_TAG, "mCellRecyclerView scroll listener removed from " +
"onScrollStateChanged");
} else if (recyclerView == mRowHeaderRecyclerView) {
Log.d(LOG_TAG, "mRowHeaderRecyclerView scroll listener removed from " +
"onScrollStateChanged");
}
}
}
protected void longPressAction(MotionEvent e) {
// Consume the action for the time when the recyclerView is scrolling.
if (mRecyclerView.getScrollState() != RecyclerView.SCROLL_STATE_IDLE) {
return;
}
// Get interacted view from x,y coordinate.
View child = mRecyclerView.findChildViewUnder(e.getX(), e.getY());
if (child != null && getTableViewListener() != null) {
// Find the view holder
RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(child);
// Call ITableView listener for long click
getTableViewListener().onRowHeaderLongPressed(holder, holder.getAdapterPosition());
}
}
protected void longPressAction(MotionEvent e) {
// Consume the action for the time when the recyclerView is scrolling.
if (mRecyclerView.getScrollState() != RecyclerView.SCROLL_STATE_IDLE) {
return;
}
// Get interacted view from x,y coordinate.
View child = mRecyclerView.findChildViewUnder(e.getX(), e.getY());
if (child != null && getTableViewListener() != null) {
// Find the view holder
RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(child);
// Call ITableView listener for long click
getTableViewListener().onColumnHeaderLongPressed(holder, holder.getAdapterPosition());
}
}
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == RecyclerView.SCROLL_STATE_IDLE) {
recyclerView.removeOnScrollListener(this);
mIsMoved = false;
mCurrentRVTouched = null;
if (recyclerView == mCellRecyclerView) {
Log.d(LOG_TAG, "mCellRecyclerView scroll listener removed from " +
"onScrollStateChanged");
} else if (recyclerView == mRowHeaderRecyclerView) {
Log.d(LOG_TAG, "mRowHeaderRecyclerView scroll listener removed from " +
"onScrollStateChanged");
}
}
}
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (AppConfig.INSTANCE.getBoolean(recyclerView.getContext(), AppConfig.Key.SCROLLING_PAUSE_LOAD) && recyclerView.getAdapter() != null) {
if (newState == RecyclerView.SCROLL_STATE_DRAGGING) {
sketch.getConfiguration().setPauseLoadEnabled(true);
} else if (newState == RecyclerView.SCROLL_STATE_IDLE) {
if (sketch.getConfiguration().isPauseLoadEnabled()) {
sketch.getConfiguration().setPauseLoadEnabled(false);
recyclerView.getAdapter().notifyDataSetChanged();
}
}
}
if (recyclerScrollListener != null) {
recyclerScrollListener.onScrollStateChanged(recyclerView, newState);
}
}
@Override
public int scrollHorizontallyBy(int dx, RecyclerView.Recycler recycler, RecyclerView.State
state) {
if (mColumnHeaderRecyclerView.getScrollState() == RecyclerView.SCROLL_STATE_IDLE &&
mCellRowRecyclerView.isScrollOthers()) {
// Every CellRowRecyclerViews should be scrolled after the ColumnHeaderRecyclerView.
// Because it is the main compared one to make each columns fit.
mColumnHeaderRecyclerView.scrollBy(dx, 0);
}
// It is important to determine the next attached view to fit all columns
mLastDx = dx;
// Set the right initialPrefetch size to improve performance
this.setInitialPrefetchItemCount(2);
return super.scrollHorizontallyBy(dx, recycler, state);
}
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
int result = 1;
if (recyclerView instanceof SuperRecyclerView) {
SuperRecyclerView superRecyclerView = (SuperRecyclerView) recyclerView;
result += superRecyclerView.getHeaderContainer().getChildCount();
}
int visibleItemCount = layoutManager.getChildCount();
boolean flag = recyclerView.computeVerticalScrollExtent() + recyclerView.computeVerticalScrollOffset() >= recyclerView.computeVerticalScrollRange();
boolean triggerCondition = visibleItemCount > result
&& newState == RecyclerView.SCROLL_STATE_IDLE
&& canTriggerLoadMore(recyclerView) && flag;
if (triggerCondition) {
onLoadMore(recyclerView);
}
}
@Override
public int scrollHorizontallyBy(int dx, RecyclerView.Recycler recycler, RecyclerView.State
state) {
if (mColumnHeaderRecyclerView.getScrollState() == RecyclerView.SCROLL_STATE_IDLE &&
mCellRowRecyclerView.isScrollOthers()) {
// Every CellRowRecyclerViews should be scrolled after the ColumnHeaderRecyclerView.
// Because it is the main compared one to make each columns fit.
//mColumnHeaderRecyclerView.scrollBy(dx, 0);
}
// It is important to determine the next attached view to fit all columns
mLastDx = dx;
// Set the right initialPrefetch size to improve performance
this.setInitialPrefetchItemCount(2);
return super.scrollHorizontallyBy(dx, recycler, state);
}
@Override
public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
state = newState;
if (state == RecyclerView.SCROLL_STATE_DRAGGING) {
isDrag = true;
}
if (state == RecyclerView.SCROLL_STATE_IDLE) {
isDrag = false;
RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
if (layoutManager == null) {
return;
}
if (mSnapHelper == null) {
return;
}
View snap = mSnapHelper.findSnapView(layoutManager);
if (snap == null) {
return;
}
int selectedPosition = layoutManager.getPosition(snap);
if (mOnPageChangeListener != null && selectedPosition != mCurItem) {
mCurItem = selectedPosition;
mOnPageChangeListener.onPageSelected(mCurItem);
}
}
}
@Override
public void onScrollStateChanged(int state) {
if (state == RecyclerView.SCROLL_STATE_IDLE) {
View view = mPagerSnapHelper.findSnapView(this);
if (view != null && mOnPageChangeListener != null) {
int position = getPosition(view);
if (currentPostion != position) {
currentPostion = position;
mOnPageChangeListener.onPageSelected(currentPostion, view);
}
}
}
super.onScrollStateChanged(state);
}
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == RecyclerView.SCROLL_STATE_IDLE) {
trackHeader();
}
}
@Override
public void onScrollStateChanged(int state) {
if (state == RecyclerView.SCROLL_STATE_IDLE) {
View viewIdle = mPagerSnapHelper.findSnapView(ViewPagerLayoutManager.this);
int positionIdle = getPosition(viewIdle);
if (mOnViewPagerListener != null && getChildCount() == 1) {
mOnViewPagerListener.onPageSelected(positionIdle, positionIdle == getItemCount() - 1);
}
}
}
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
if (newState == RecyclerView.SCROLL_STATE_IDLE) {
unlockBinding();
}
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
displayWithAnimation = mRecyclerView.getScrollState() == RecyclerView.SCROLL_STATE_IDLE;
updateOrClearHeader(false);
}
@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
// Prevent multitouch, once we start to listen with a RV,
// we ignore any other RV until the touch is released (UP)
if (mCurrentRVTouched != null && rv != mCurrentRVTouched) {
return true;
}
if (e.getAction() == MotionEvent.ACTION_DOWN) {
mCurrentRVTouched = rv;
if (rv.getScrollState() == RecyclerView.SCROLL_STATE_IDLE) {
if (mLastTouchedRecyclerView != null && rv != mLastTouchedRecyclerView) {
if (mLastTouchedRecyclerView == mColumnHeaderRecyclerViews) {
mColumnHeaderRecyclerViews.get(0).removeOnScrollListener(this);
mColumnHeaderRecyclerViews.get(0).stopScroll();
Log.d(LOG_TAG, "Scroll listener has been removed to " +
"mColumnHeaderRecyclerView at last touch control");
} else {
int lastTouchedIndex = getIndex(mLastTouchedRecyclerView);
// Control whether the last touched recyclerView is still attached or not
if (lastTouchedIndex >= 0 && lastTouchedIndex < mCellLayoutManager
.getChildCount()) {
// Control the scroll listener is already removed. For instance; if user
// scroll the parent recyclerView vertically, at that time,
// ACTION_CANCEL
// will be triggered that removes the scroll listener of the last
// touched
// recyclerView.
if (!((CellRecyclerView) mLastTouchedRecyclerView)
.isHorizontalScrollListenerRemoved()) {
// Remove scroll listener of the last touched recyclerView
// Because user touched another recyclerView before the last one get
// SCROLL_STATE_IDLE state that removes the scroll listener
((RecyclerView) mCellLayoutManager.getChildAt(lastTouchedIndex))
.removeOnScrollListener(this);
Log.d(LOG_TAG, "Scroll listener has been removed to " +
mLastTouchedRecyclerView.getId() + " CellRecyclerView " +
"at last touch control");
// the last one scroll must be stopped to be sync with others
((RecyclerView) mCellLayoutManager.getChildAt(lastTouchedIndex))
.stopScroll();
}
}
}
}
mXPosition = ((CellRecyclerView) rv).getScrolledX();
rv.addOnScrollListener(this);
Log.d(LOG_TAG, "Scroll listener has been added to " + rv.getId() + " at action "
+ "down");
}
} else if (e.getAction() == MotionEvent.ACTION_MOVE) {
mCurrentRVTouched = rv;
// Why does it matter ?
// user scroll any recyclerView like brushing, at that time, ACTION_UP will be
// triggered
// before scrolling. So, we need to store whether it moved or not.
mIsMoved = true;
} else if (e.getAction() == MotionEvent.ACTION_UP) {
mCurrentRVTouched = null;
int nScrollX = ((CellRecyclerView) rv).getScrolledX();
// Is it just touched without scrolling then remove the listener
if (mXPosition == nScrollX && !mIsMoved) {
rv.removeOnScrollListener(this);
Log.d(LOG_TAG, "Scroll listener has been removed to " + rv.getId() + " at " +
"action" + " up");
}
mLastTouchedRecyclerView = rv;
} else if (e.getAction() == MotionEvent.ACTION_CANCEL) {
// ACTION_CANCEL action will be triggered if users try to scroll vertically
// For this situation, it doesn't matter whether the x position is changed or not
// Beside this, even if moved action will be triggered, scroll listener won't
// triggered on cancel action. So, we need to change state of the mIsMoved value as
// well.
// Renew the scroll position and its offset
renewScrollPosition(rv);
rv.removeOnScrollListener(this);
Log.d(LOG_TAG, "Scroll listener has been removed to " + rv.getId() + " at action " +
"cancel");
mIsMoved = false;
mLastTouchedRecyclerView = rv;
mCurrentRVTouched = null;
}
return false;
}
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState){
if (newState == RecyclerView.SCROLL_STATE_IDLE && mHelper.isValidView(recyclerView)) {
returnSearchBarPosition();
}
}
private boolean canStartSwipe(MotionEvent e1, MotionEvent e2) {
return !(e1 == null || e2 == null || mSwipeView == null || mRecyclerView.getScrollState() != RecyclerView.SCROLL_STATE_IDLE
|| mSwipeView.getSupportedSwipeDirection() == ListSwipeItem.SwipeDirection.NONE);
}