存储和还原RecyclerView位置不起作用 [英] Store and restore RecyclerView position not working

问题描述

我正在使用GridLayoutManager作为片段内的RecyclerView的LayoutManager，并且RecyclerView适配器由加载程序填充. 我尝试在设备旋转时存储和还原GridLayoutManager的状态，但无法正常工作，但仍返回到初始状态"RecyclerView中的第一个元素".

I am using GridLayoutManager as LayoutManager for RecyclerView inside a fragment , and RecyclerView adapter get populated by loader. I tried to store and restore state of GridLayoutManager on device rotation but not working and still get back to the initial state "first element in RecyclerView".

onSaveInstanceState方法:

onSaveInstanceState method:

    @Override
public void onSaveInstanceState(Bundle outState) {
    mRecylcerViewParecelable = mGridView.getLayoutManager().onSaveInstanceState();
    outState.putParcelable(GRID_LAYOUT_PARCEL_KEY, mRecylcerViewParecelable);
    super.onSaveInstanceState(outState);
}

onViewStateRestored方法:

onViewStateRestored method:

    @Override
public void onViewStateRestored(@Nullable Bundle savedInstanceState) {
    if(savedInstanceState!=null){
        mRecylcerViewParecelable = savedInstanceState.getParcelable(GRID_LAYOUT_PARCEL_KEY);
    }
    super.onViewStateRestored(savedInstanceState);
}

onLoadFinished方法:

onLoadFinished method:

    @Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
    mMovieAdapter.swapCursor(data);
  mGridView.getLayoutManager().onRestoreInstanceState(mRecylcerViewParecelable);}

推荐答案

尝试在处理程序中包装onRestoreInstanceState():

Try to wrap onRestoreInstanceState() inside Handler:

new Handler().postDelayed(new Runnable() {
            @Override public void run() {
                mGridView.getLayoutManager().onRestoreInstanceState(listState);
            }
        }, 300);

延迟onRestoreInstanceState是一个黑客. 我遇到了同样的问题，IMO，看起来RecyclerView一直回到初始状态，因为当我们调用onRestoreInstanceState时，仍会填充Adapter中的数据.

It's a hack to delay the onRestoreInstanceState. I've experienced the same issue, IMO it looks like the RecyclerView keeps going back to initial state because the data in Adapter still being populated when we call the onRestoreInstanceState.

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