Forked from NikolaDespotoski/SwipeRefreshLayoutToggleScrollListener
Created
March 31, 2016 10:30
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Fix for known bug when scrolling a RecyclerView inside SwipeRefreshLayout to the top and refresh is called prematurely, before the first item is shown.
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public class SwipeRefreshLayoutToggleScrollListener extends RecyclerView.OnScrollListener { | |
private List<RecyclerView.OnScrollListener> mScrollListeners = new ArrayList<RecyclerView.OnScrollListener>(); | |
private int mExpectedVisiblePosition = 0; | |
private SwipeRefreshLayout mSwipeLayout; | |
public SwipeRefreshLayoutToggleScrollListener(SwipeRefreshLayout swipeLayout) { | |
mSwipeLayout = swipeLayout; | |
} | |
public void addScrollListener(RecyclerView.OnScrollListener listener){ | |
mScrollListeners.add(listener); | |
} | |
public boolean removeScrollListener(RecyclerView.OnScrollListener listener){ | |
return mScrollListeners.remove(listener); | |
} | |
public void setExpectedFirstVisiblePosition(int position){ | |
mExpectedVisiblePosition = position; | |
} | |
@Override | |
public void onScrollStateChanged(RecyclerView recyclerView, int newState) { | |
super.onScrollStateChanged(recyclerView, newState); | |
notifyScrollStateChanged(recyclerView,newState); | |
LinearLayoutManager llm = (LinearLayoutManager) recyclerView.getLayoutManager(); | |
int firstVisible = llm.findFirstCompletelyVisibleItemPosition(); | |
if(firstVisible != RecyclerView.NO_POSITION) | |
mSwipeLayout.setEnabled(firstVisible == mExpectedVisiblePosition); | |
} | |
@Override | |
public void onScrolled(RecyclerView recyclerView, int dx, int dy) { | |
super.onScrolled(recyclerView, dx, dy); | |
notifyOnScrolled(recyclerView, dx, dy); | |
} | |
private void notifyOnScrolled(RecyclerView recyclerView, int dx, int dy){ | |
for(RecyclerView.OnScrollListener listener : mScrollListeners){ | |
listener.onScrolled(recyclerView, dx, dy); | |
} | |
} | |
private void notifyScrollStateChanged(RecyclerView recyclerView, int newState){ | |
for(RecyclerView.OnScrollListener listener : mScrollListeners){ | |
listener.onScrollStateChanged(recyclerView, newState); | |
} | |
} | |
} |
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