I have a RecyclerView with a LinearLayoutManager in orientation HORIZONTAL. Each item in it can have interactive elements (including vertical ScrollViews). Is there a way to easily make the RecyclerView ignore any attempts by the user to scroll or fling the RecyclerView horizontally without intercepting touch events to the children?
I am programmatically controlling the scroll of the RecyclerView which works great until the user flings it.
I have tried something very simple where the idea is when I call smoothScrollToPosition in response to some event, I enable scrolling and disable touch events until the scroll settles. Like this:
private class NoScrollHorizontalLayoutManager extends LinearLayoutManager {
ScrollingTouchInterceptor interceptor = new ScrollingTouchInterceptor();
protected boolean canScroll;
public NoScrollHorizontalLayoutManager(Context ctx) {
super(ctx, LinearLayoutManager.HORIZONTAL, false);
}
public RecyclerView.OnItemTouchListener getInterceptor() {
return interceptor;
}
@Override
public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) {
canScroll = true;
super.smoothScrollToPosition(recyclerView, state, position);
}
@Override
public void onScrollStateChanged(int state) {
super.onScrollStateChanged(state);
if(state == RecyclerView.SCROLL_STATE_IDLE) {
canScroll = false;
}
}
@Override
public boolean canScrollHorizontally() {
return canScroll;
}
public class ScrollingTouchInterceptor implements RecyclerView.OnItemTouchListener {
@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
return canScrollHorizontally();
}
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
}
}
And use it like this..
NoScrollHorizontalLayoutManager layout = new NoScrollHorizontalLayoutManager(context);
recycler.setLayoutManager(layout);
recycler.addOnItemTouchListener(layout.getInterceptor());
which actually almost works... but I can still screw up the programmatic scroll by tapping the screen when the smooth scroll is in motion. clearly I'm missing something obvious or there is a much smarter way to do this.
UPDATE the non-RecyclerView solution was found here: How do disable paging by swiping with finger in ViewPager but still be able to swipe programmatically?
/**
* ViewPager that doesn't allow swiping.
*/
public class NonSwipeableViewPager extends ViewPager {
public NonSwipeableViewPager(Context context) {
super(context);
}
public NonSwipeableViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
// Never allow swiping to switch between pages
return false;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// Never allow swiping to switch between pages
return false;
}
}
