how to remove this error (android.content.res.Resources$NotFoundException: String resource ID #0xffffffff)

I'm building an Android app that contain SQLite DB and I was having a problem with translating SQLite saved data then I find a solution which is a method to get resource id of strings, and it worked just fine, the app was working fine then suddenly this error showed I don't know why, please help

The method, I used to get resource for string:

     public static int getResId(String resName, Class<?> c) {

        try {
            Field idField = c.getDeclaredField(resName);
            return idField.getInt(idField);
        } catch (Exception e) {
            e.printStackTrace();
            return -1;
        }
    }

The code in the adapter

    textViewname.setText(context.getString(R.string.product_Name)+" " + repo.getName());
    textViewquantity.setText(context.getString(R.string.last_added_qty)+" " + repo.getQuantity() + " " + context.getResources().getString(mdatabase.getResId(repo.getItemsType(),R.string.class)));
    textViewdate.setText(context.getString(R.string.entry_date)+" " + repo.getDate()+ " /"+context.getResources().getString(mdatabase.getResId(repo.getInOrOut(),R.string.class)));
    textViewTotal.setText(context.getString(R.string.total_qty)+" " + repo.getTotal() + " " + context.getResources().getString(mdatabase.getResId(repo.getItemsType(),R.string.class)));
    textviewlastUpdated.setText(context.getString(R.string.last_updated_date)+" " + repo.getUpdateDate() +" /"+context.getResources().getString(mdatabase.getResId(repo.getInOrOut(),R.string.class)));
    textViewid.setText(context.getString(R.string.id)+" " + repo.getId());
    textViewOutputqty.setText(context.getString(R.string.last_out_qty)+" " + repo.getOutputqty() + " " + context.getResources().getString(mdatabase.getResId(repo.getItemsType(),R.string.class)));
    textViewpriceofsingleitem.setText(context.getString(R.string.retail_price)+" " + repo.getPrice() + " " + context.getResources().getString(mdatabase.getResId(repo.getCurrency(),R.string.class)));
    textViewpriceofMultipleitem.setText(context.getString(R.string.wholesale_price)+" " + repo.getPriceofmultipleInput() + " " + context.getResources().getString(mdatabase.getResId(repo.getCurrency(),R.string.class)));
    textViewProfitSIngle.setText(context.getString(R.string.retail_profit)+" " + repo.getProfitSingle() + " " + context.getResources().getString(mdatabase.getResId(repo.getCurrency(),R.string.class)));
    textViewProfitMultiple.setText(context.getString(R.string.wholesale_profit)+" " + repo.getProfitMultiple() + " " + context.getResources().getString(mdatabase.getResId(repo.getCurrency(),R.string.class)));
    textViewPurchasingPrice.setText(context.getString(R.string.purchasing_price)+" " + repo.getPurchasingPricePeranItem() + " " + context.getResources().getString(mdatabase.getResId(repo.getCurrency(),R.string.class)));
    textViewTotalPurchasingPrice.setText(context.getString(R.string.total_purchase_price)+" " + repo.getTotalPurchasingPrice() + " " + context.getResources().getString(mdatabase.getResId(repo.getCurrency(),R.string.class)));
    textViewTotalProfitSingle.setText(context.getString(R.string.total_retail_profit)+" " + repo.getTotalProfitperSingle() + " " + context.getResources().getString(mdatabase.getResId(repo.getCurrency(),R.string.class)));
    textViewTotalProfitMultiple.setText(context.getString(R.string.total_wholesale_profit)+" "+ repo.getTotalProfitPerMultiple() + " " + context.getResources().getString(mdatabase.getResId(repo.getCurrency(),R.string.class)));
    textViewitemsIBox.setText(context.getString(R.string.num_unitsInBox)+" "+ repo.getItemsInBox());
    textViewSinglePriceOfiteminBox.setText(context.getString(R.string.retail_price_perUnit)+ " " + repo.getSinglePriceofItemInBox()+" " +context.getResources().getString(mdatabase.getResId(repo.getCurrency(),R.string.class)));
    textViewMultipriceOfItemInBox.setText(context.getString(R.string.wholesale_price_perUnit)+" "+repo.getMultiplePriceofitemInBox()+" "+context.getResources().getString(mdatabase.getResId(repo.getCurrency(),R.string.class)));
    textViewtotalItemsInBoexs.setText(context.getString(R.string.total_units)+" "+ repo.getTotalitemsInboxes() +" "+ context.getResources().getString(R.string.Pieces));

This error happens because you are trying to get resource that does not exist. It is because you store memory address which allocate to your string resource and possible it will change next time. I do not know what is your scenario but why you store it already in your strings it will never lost. I can help you to build another logic only when you tell what are you trying to achieve.