RecyclerView-滚动到每次都不工作的位置 [英] RecyclerView - Scroll To Position Not Working Every Time

问题描述

我实现了水平可滚动RecyclerView.我的RecyclerView使用的是LinearLayoutManager，而我面临的问题是，当我尝试使用scrollToPosition(position)或smoothScrollToPosition(position)或从LinearLayoutManager的scrollToPositionWithOffset(position)使用时.都不适合我.滚动调用不会滚动到所需位置，或者不会调用OnScrollListener.

I have implemented a horizontal scrollable RecyclerView. My RecyclerView uses a LinearLayoutManager, and the problem I am facing is that when I try to use scrollToPosition(position) or smoothScrollToPosition(position) or from LinearLayoutManager's scrollToPositionWithOffset(position). Neither works for me. Either a scroll call doesn't scroll to the desired location or it doesn't invoke the OnScrollListener.

到目前为止，我已经尝试了很多不同的代码组合，以至于无法在此处全部发布.以下是对我有用的内容(但仅部分适用):

So far I have tried so many different combinations of code that I cannot post them all here. Following is the one that works for me (But only partially):

public void smoothUserScrollTo(final int position) {

    if (position < 0 || position > getAdapter().getItemCount()) {
        Log.e(TAG, "An attempt to scroll out of adapter size has been stopped.");
        return;
    }

    if (getLayoutManager() == null) {
        Log.e(TAG, "Cannot scroll to position a LayoutManager is not set. " +
                "Call setLayoutManager with a non-null layout.");
        return;
    }

    if (getChildAdapterPosition(getCenterView()) == position) {
        return;
    }

    stopScroll();

    scrollToPosition(position);

    if (lastScrollPosition == position) {

        addOnLayoutChangeListener(new OnLayoutChangeListener() {
            @Override
            public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {

                if (left == oldLeft && right == oldRight && top == oldTop && bottom == oldBottom) {
                    removeOnLayoutChangeListener(this);

                    updateViews();

                    // removing the following line causes a position - 3 effect.
                    scrollToView(getChildAt(0));
                }
            }
        });
    }

    lastScrollPosition = position;
}

@Override
public void scrollToPosition(int position) {
    if (position < 0 || position > getAdapter().getItemCount()) {
        Log.e(TAG, "An attempt to scroll out of adapter size has been stopped.");
        return;
    }

    if (getLayoutManager() == null) {
        Log.e(TAG, "Cannot scroll to position a LayoutManager is not set. " +
                "Call setLayoutManager with a non-null layout.");
        return;
    }

//      stopScroll();

        ((LinearLayoutManager) getLayoutManager()).scrollToPositionWithOffset(position, 0);
//        getLayoutManager().scrollToPosition(position);
    }

由于此，我选择了scrollToPositionWithOffset() ，但也许是这样有所不同，因为我使用LinearLayoutManager而不是GridLayoutManager.但是该解决方案也确实对我有用，但是正如我前面所说的那样.

I opted for scrollToPositionWithOffset() because of this but the case perhaps is different as I use a LinearLayoutManager instead of GridLayoutManager. But the solution does work for me too, but as I said earlier only partially.

• 当滚动调用从第0个位置到totalSize时-7个滚动就像一个超级按钮.
• 当滚动从totalSize-7到totalSize-3时，我第一次只滚动到列表中的第7个最后一项.但是第二次我可以滚动
• 从totalSize-3滚动到totalSize时，我开始出现意外行为.

如果有人找到了解决方案，我将不胜感激.这是我的自定义代码ReyclerView的要点.

If anyone has found a work around I'd Appreciate it. Here's the gist to my code of custom ReyclerView.

推荐答案

几周前，我遇到了同样的问题，但发现只有一个非常糟糕的解决方案可以解决.必须使用200-300ms的postDelayed.

I had the same issue some weeks ago, and found only a really bad solution to solve it. Had to use a postDelayed with 200-300ms.

new Handler().postDelayed(new Runnable() {
    @Override
    public void run() {
        yourList.scrollToPosition(position);
    }
}, 200);

如果您找到了更好的解决方案，请告诉我！祝你好运！

If you found a better solution, please let me know! Good luck!

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