在回收器视图GridLayout中更改跨度大小期间如何显示进度条？

Question

我正在使用RecolyerView和GridLayout来显示产品。我有一个按钮，当点击时改变跨度大小。我已经使用GridLayoutManager.setSpanSizeLookup动态更改跨度大小。一切正常，但当我点击按钮，它需要一些时间来改变跨度大小。我想在这个过程中显示一个进度条。我怎么能那样做？

 public void onGridViewClick() {
        if (isGridViewEnabled){
            gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
                @Override
                public int getSpanSize(int position) {
                    switch (adapter.getItemAtPosition(position).getType()) {
                        case BaseGoodkartSearchResultModel.SEARCH_ITEM: return 2;
                        case BaseGoodkartSearchResultModel.SWAN_ITEM:  return 2;
                        case BaseGoodkartSearchResultModel.OFFER_EXPIRED: return 2;
                    }
                    return 1;
                }
            });
            isGridViewEnabled=false;

        }else {
            gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
                @Override
                public int getSpanSize(int position) {
                    switch (adapter.getItemAtPosition(position).getType()) {
                        case BaseGoodkartSearchResultModel.SEARCH_ITEM: return 1;
                        case BaseGoodkartSearchResultModel.SWAN_ITEM:  return 2;
                        case BaseGoodkartSearchResultModel.OFFER_EXPIRED: return 2;
                    }
                    return 1;
                }
            });
            isGridViewEnabled=true;
        }
        
    }

Answer 1

只需在用户点击网格视图时显示一个带有进度条（默认进度条如圆形）的报警对话框，并在视图加载后将其删除。

        AlertDialog alertDialog;  
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setCancelable(false);
        builder.setView(R.layout.progresslayout);// This Layout just contain a simple progress bar
        alertDialog = builder.create();
        alertDialog.show();
        alertDialog.dismiss();// to dismiss when layout loaded