调用smoothScrollPosition滚动指定位置，会出现回滚到原来位置

你好，我用的平板横屏调试demo，出现这个问题。我debug看了下，位置0->位置1,正常调用smoothScrollToPosition 位置1->位置2,调用smoothScrollToPosition同时会调用scrollHorizontallyBy，导致mOffsetAll重新计算，导致滚动失败。我尝试着在scrollHorizontallyBy 和 fixOffsetWhenFinishScroll方法里加个判断，return出去不触发，恢复正常使用。具体原因分析不出来。我的修改： ` @Override public int scrollHorizontallyBy(int dx, RecyclerView.Recycler recycler, RecyclerView.State state) { if (isSmoothScroll){ Log.e("isSmoothScroll" , "return"); return 0; } if (mAnimation != null && mAnimation.isRunning()) mAnimation.cancel(); int travel = dx; if (!mIsLoop) { //非循环模式，限制滚动位置 if (dx + mOffsetAll < 0) { travel = -mOffsetAll; } else if (dx + mOffsetAll > getMaxOffset()){ travel = (int) (getMaxOffset() - mOffsetAll); } } mOffsetAll += travel; //累计偏移量 layoutItems(recycler, state, dx > 0 ? SCROLL_TO_LEFT : SCROLL_TO_RIGHT); return travel; } /**

修正停止滚动后，Item滚动到中间位置 / private void fixOffsetWhenFinishScroll() { if (isSmoothScroll){ Log.e("smoothScroll","return fixOffsetWhenFinishScroll"); return; } int scrollN = (int) (mOffsetAll 1.0f / getIntervalDistance()); float moreDx = (mOffsetAll % getIntervalDistance()); double judgeDistance = getIntervalDistance() 0.5; if (Math.abs(moreDx) > judgeDistance) { if (moreDx > 0) scrollN ++; else scrollN --; } int finalOffset = (int) (scrollN getIntervalDistance()); startScroll(mOffsetAll, finalOffset); mSelectPosition = Math.abs(Math.round (finalOffset * 1.0f / getIntervalDistance())) % getItemCount(); } /**
滚动到指定X轴位置
@param from X轴方向起始点的偏移量
@param to X轴方向终点的偏移量 */ private isSmoothScroll = false; private void startScroll(int from, int to) { if (mAnimation != null && mAnimation.isRunning()) { mAnimation.cancel(); } final int direction = from < to ? SCROLL_TO_LEFT : SCROLL_TO_RIGHT; mAnimation = ValueAnimator.ofFloat(from, to); mAnimation.setDuration(500); mAnimation.setInterpolator(new DecelerateInterpolator()); mAnimation.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { mOffsetAll = Math.round((float) animation.getAnimatedValue()); layoutItems(mRecycle, mState, direction); } }); mAnimation.addListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) { }
```
    @Override
    public void onAnimationEnd(Animator animation) {
        onSelectedCallBack();
        isSmoothScroll = false;
    }

    @Override
    public void onAnimationCancel(Animator animation) {

    }

    @Override
    public void onAnimationRepeat(Animator animation) {

    }
});
mAnimation.start();
```
}

@Override public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) { // TODO 循环模式暂不支持平滑滚动

    if (mIsLoop) return;
    int finalOffset = calculateOffsetForPosition(position);
    if (mRecycle == null || mState == null) {//如果RecyclerView还没初始化完，先记录下要滚动的位置
        mSelectPosition = position;
    } else {
        startScroll(mOffsetAll, finalOffset);
        isSmoothScroll = true;
    }
}

ChenLittlePing / RecyclerCoverFlow

调用smoothScrollPosition滚动指定位置，会出现回滚到原来位置 #19