RecyclerView拖放 - 使用ItemTouchHelper - 如何在拖动时更快地设置滚动速度？

Question

I tried this code for drag and drop : https://github.com/iPaulPro/Android-ItemTouchHelper-Demo .

Here is a video : https://youtu.be/lMsv2jYpbi4

Is there a way to speed up the scrolling during drag-and-drop ?

Answer 1

In your class that extends ItemTouchHelper.Callback , override the method:

@Override
public int interpolateOutOfBoundsScroll(RecyclerView recyclerView, int viewSize, int viewSizeOutOfBounds, int totalSize, long msSinceStartScroll) {
    final int direction = (int) Math.signum(viewSizeOutOfBounds);
    return 10 * direction;
}

This is a simple example which uses a fixed scroll speed, but if you wanted something that started slow and sped up (like the super.interpolateOutOfBoundsScroll does) you can do some maths based on the time since scrolling ( msSinceStartScroll ) and also the position in the overall scroll (example scroll faster when in the middle of the scroller and slower when you near the start/end).