如何在Android中保存RecyclerView的滚动位置? [英] How to save scroll position of RecyclerView in Android?

问题描述

我有SwipeRefreshLayout内部的Recycler视图.另外，具有打开另一个活动中的每个项目的能力. 返回到回收站后，我需要滚动到所选项目或上一个Y. 该怎么做?

I have Recycler view which lays inside of SwipeRefreshLayout. Also, have ability to open each item in another activity. After returning back to Recycler I need scroll to chosen item, or to previous Y. How to do that?

是的，我搜寻了一下，在StackOverFlow中找到了有关保存布局管理器实例的文章，例如:

Yes, I googled, found articles in StackOverFlow about saving instance of layout manager, like this one: RecyclerView store / restore state between activities. But, it doesn't help me.

更新

现在我有这种解决问题的方法，但是，当然，它也行不通.

Right now I have this kind of resolving problem, but, of course, it also doesn't work.

private int scrollPosition;

...//onViewCreated - it is fragment
recyclerView.setHasFixedSize(true);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(llm);
data = new ArrayList<>();
adapter.setData(getActivity(), data);
recyclerView.setAdapter(adapter);
...

@Override
public void onResume() {
    super.onResume();
    recyclerView.setScrollY(scrollPosition);
}

@Override
public void onPause() {
    super.onPause();
    scrollPosition = recyclerView.getScrollY();
}

是的，我已经尝试过scrollTo(int，int)-不起作用.

Yes, I have tried scrollTo(int, int) - doen't work.

现在我尝试仅滚动到例如Y = 100，但它根本不滚动.

Now I tried just scroll, for example, to Y = 100, but it doesn't scrolling at all.

推荐答案

通过@onPause保存回收视图位置的当前状态:

Save the current state of recycle view position @onPause:

    positionIndex= llManager.findFirstVisibleItemPosition();
    View startView = rv.getChildAt(0);
    topView = (startView == null) ? 0 : (startView.getTop() - rv.getPaddingTop());

通过@onResume恢复滚动位置:

Restore the scroll position @onResume:

    if (positionIndex!= -1) {
        llManager.scrollToPositionWithOffset(positionIndex, topView);
    }

或另一种方式可以是@onPause:

or another way can be @onPause:

long currentVisiblePosition = 0;
currentVisiblePosition = ((LinearLayoutManager)rv.getLayoutManager()).findFirstCompletelyVisibleItemPosition();

还原@onResume:

restore @onResume:

((LinearLayoutManager) rv.getLayoutManager()).scrollToPosition(currentVisiblePosition);
currentVisiblePosition = 0;

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