RecyclerView平滑滚动

Question

我想在recyclerView中使平滑的滚动条需要位置。我是LinearLayoutManager中的ovverride方法smoothScrollToPosition，它工作正常。但是，我需要在屏幕顶部设置滚动位置（如果可能的话）。我也尝试过scrollToPositionWithOffset，这是我需要的，但现在，没有平滑的效果。如何混合这些方法，并在顶部设置项目进行平滑滚动？

private LinearLayoutManager linearLayoutManager = new    LinearLayoutManager(this){
    @Override
    public void smoothScrollToPosition(RecyclerView recyclerView,
                                       RecyclerView.State state, final int position) {

        LinearSmoothScroller smoothScroller =
                new LinearSmoothScroller(getApplicationContext()) {

                    //This controls the direction in which smoothScroll looks
                    //for your view
                    @Override
                    public PointF computeScrollVectorForPosition
                    (int targetPosition) {
                        return this
                                .computeScrollVectorForPosition(targetPosition);
                    }

                    //This returns the milliseconds it takes to
                    //scroll one pixel.
                    @Override
                    protected float calculateSpeedPerPixel
                    (DisplayMetrics displayMetrics) {
                        return 50f/displayMetrics.densityDpi;
                    }
                };

        smoothScroller.setTargetPosition(position);
        startSmoothScroll(smoothScroller);
    }
};

Answer 1

这是迟到的回复，但我想建议一个库SnappySmoothScroller。 此库可以使用特定的捕捉位置进行平滑滚动：SnapType.START，SnapType.CENTER或SnapType.END

像这样使用：

    private LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this) {
        @Override
        public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) {
            SnappySmoothScroller scroller = new SnappySmoothScroller.Builder()
                    .setPosition(position)
                    .setSnapType(SnapType.START)
                    .setScrollVectorDetector(new LinearLayoutScrollVectorDetector(this))
                    .build(recyclerView.getContext());

            startSmoothScroll(scroller);
        }
    };