如何在屏幕旋转时保持recyclerView的滚动位置

我正在使用 gridlayoutManager 填充 recyclerView。现在我想保存屏幕旋转的滚动位置。

我尝试使用 onSaveInstanceState 和 onRestoreInstanceState() 来执行此操作，如本文所示：

如何使用RecyclerView.State保存RecyclerView滚动位置？ https://stackoverflow.com/questions/27816217/how-to-save-recyclerviews-scroll-position-using-recyclerview-state

下面是我的代码：

@Override
protected void onSaveInstanceState(Bundle outState) {
    Log.e(TAG, "onSaveInstanceState");
    super.onSaveInstanceState(outState);
    outState.putParcelable(KEY_INSTANCE_STATE_RV_POSITION, 
    gridLayoutManager.onSaveInstanceState());
 }


@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {

    Log.e(TAG, "onRestoreInstanceState");
    super.onRestoreInstanceState(savedInstanceState);
    if (savedInstanceState!= null){
        Parcelable savedState = 
    savedInstanceState.getParcelable(KEY_INSTANCE_STATE_RV_POSITION);

        movieAdapter.addAll(movieItemList);
        if (savedState!= null){
            gridLayoutManager.onRestoreInstanceState(savedState);
        }
    }
}


//this is my movieAdapter.addAll() method 

public void addAll(List<MovieItem>items){

    movieItems = items;
}


//This is the method to get lists of movies from ViewModel Class

private void loadFavMovies() {
    FavViewModel favViewModel = 
    ViewModelProviders.of(MainActivity.this).get(FavViewModel.class);
    favViewModel.getFavListLiveData().observe(MainActivity.this, new 
    Observer<List<FavlistItem>>() {
        @Override
        public void onChanged(List<FavlistItem> favlistItems) {
            if (!favlistItems.isEmpty()) {
                loadingIndicator.setVisibility(View.GONE);
                movieRecycler.setVisibility(View.GONE);
                favRecycler.setVisibility(View.VISIBLE);
                favAdapter.setFavlistItems(favlistItems);
                Toast.makeText(getApplicationContext(), "Swipe Left Or 
       Right To remove Item",Toast.LENGTH_SHORT).show();
               }else {
                loadingIndicator.setVisibility(View.GONE);
                Toast.makeText(getApplicationContext(), "No Favorite 
      Movies",Toast.LENGTH_SHORT).show();
            }
        }
    });
}

这是该项目的 GitHub 链接https://github.com/harshabhadra/Movies-Mela https://github.com/harshabhadra/Movies-Mela

我知道我迟到了，但如果有帮助的话仍然！！

存储回收器视图位置比其他答案使它看起来简单得多

您可以这样做

首先创建一个成员变量

    Parcelable state;

Now,

@Override
protected void onPause() {
    super.onPause();
    state = recyclerView.getLayoutManager().onSaveInstanceState();
}

@Override
protected void onResume() {
    super.onResume();
        recyclerView.getLayoutManager().onRestoreInstanceState(state);
}

使用上面的代码覆盖 onpause 和 onresume 方法，你就可以开始了！