在搜索中找不到新增加的股票查看

Question

所以这不是我得到的错误或任何东西。这是一个我很难做到的实现。

我做了一个股票应用，你可以从API中搜索股票，并将它们添加到回收者View中。我还实现了一个searchView来查找我的recyclerView列表中的任何某只股票。

然而，这是我的问题：比方说，我打开应用程序，并从API中添加一个新的股票到列表中。它将该股票完美地添加到列表中。然而，当我去搜索View寻找我刚刚添加的那只股票时，我无法在搜索View列表中找到它。事实上，某只股票也从回收器列表中被删除了（在我进入searchView之前，它还完美地存在着）。当我重新启动应用程序时，这时股票又出现在回收商列表中，这次我可以从搜索视图列表中访问它。这只是一个奇怪的事情发生。

这个问题只发生在我试图找到一个我刚刚添加到我的列表中的股票，并且想要在搜索View中找到它之后。如果我关闭应用程序并重新打开，这时搜索视图就会知道该股票存在。否则，只要有新股票被添加，它似乎就不知道。

请大家帮忙

适配器类w过滤器的实现。

public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> implements Filterable {
MainActivity mainAct;
List<Stock> stocks;
List<Stock> searchAllStocks;

Adapter(MainActivity ma, List<Stock> stocks) {
    this.mainAct = ma;
    this.stocks = stocks;
    this.searchAllStocks = new ArrayList<>(stocks);
}
@Override
public Filter getFilter() {
    return stockFilter;
}
private Filter stockFilter = new Filter() {
    //runs on background thread
    @Override
    protected FilterResults performFiltering(CharSequence constraint) { //charSequence constraint is whatever is typed into search
        List<Stock> filteredList = new ArrayList<Stock>(); //list to store only filtered items

        if(constraint == null || constraint.length() == 0) { //if nothing in input field
            filteredList.addAll(searchAllStocks); //show all stocks on filteredList
        }
        else { //else get user input and convert into string to filter
            String filterPattern = constraint.toString().toLowerCase().trim();

            for(Stock item: searchAllStocks) { //for each stock item in
                if(item.getName().toLowerCase().contains(filterPattern)) { //add items that match to filteredList
                    filteredList.add(item);
                }
                if(item.getSymbol().toLowerCase().contains(filterPattern)) { //add items that match to filteredList
                    filteredList.add(item);
                }
            }
        }

        //returns FilterResults and gets passed to publishResults
        FilterResults results = new FilterResults();
        results.values = filteredList;

        return results;
    }
    //runs on UI thread
    //clears current stock list and adds results of user's search to list
    @Override
    protected void publishResults(CharSequence constraint, FilterResults results) {
        stocks.clear();
        stocks.addAll((List)results.values);
        notifyDataSetChanged();
    }
};

当搜索按钮被按下时，MainActivity中的方法被执行。

//if search button is pressed
    if(item.getItemId() == R.id.search) {
        //set up new toolbar for searching
        searchView = (SearchView)item.getActionView();
        searchView.onActionViewExpanded(); //expands search bar
        searchView.setImeOptions(EditorInfo.IME_ACTION_DONE); //sets keyboard icon to done after user types
        searchView.setQueryHint("Search...");


        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            //does stuff after text submitted
            @Override
            public boolean onQueryTextSubmit(String query) {
                return false;
            }

            //does stuff in realtime
            @Override
            public boolean onQueryTextChange(String newText) {
                adapter.getFilter().filter(newText);
                return true;
            }
        });
    }

我想问题就出在这里

从AsyncTask类中获取信息后，调用此方法。

//update Stock list on screen w/ info passed from Async class AsyncStockDownloader
public void updateData(Stock stock) {
    boolean flag = false;

    //check for duplicate stocks on list
    for(int i = 0; i < stocks.size(); i++) {
        if(stocks.get(i).getSymbol().equals(stock.getSymbol())) {
            //create alertbox
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setMessage(stock.getSymbol() + " is already displayed!");
            builder.setTitle("Duplicate Stock");

            AlertDialog dialog = builder.create();
            dialog.show();
            flag = true;
        }
    }

    //if no duplicate then add to list, database, and notify adapter that we changed
    if(!flag) {
        stocks.add(stock);
        db.addStock(stock);
        adapter.notifyDataSetChanged();
        //problem is here. we need to let searchAllStocks in adapter know when stock is added
        //so that searchbar can store new stock into searchAllStocks
    }
}

如果有任何其他代码需要我发布，请告诉我。这些只是我认为问题可能出在哪里的片段。

先谢谢你们了!

这是在收到Asynctask的信息后调用的方法。

我添加了1行代码来尝试解决这个问题：Adapter.searchAllStocks.add(...)，正如评论中所建议的那样。

这些是结果

//update Stock list on screen w/ info passed from Async class AsyncStockDownloader
public void updateData(Stock stock) {
    boolean flag = false;

    //check for duplicate stocks on list
    for(int i = 0; i < stocks.size(); i++) {
        if(stocks.get(i).getSymbol().equals(stock.getSymbol())) {
            adapter.searchAllStocks.clear();
            //create alertbox
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setMessage(stock.getSymbol() + " is already displayed!");
            builder.setTitle("Duplicate Stock");

            AlertDialog dialog = builder.create();
            dialog.show();
            flag = true;
        }
    }

    //if no duplicate then add to list, database, and notify adapter that we changed
    if(!flag) {
        stocks.add(stock);
        adapter.searchAllStocks.add(new Stock(stock.getSymbol(), stock.getName(), stock.getLatestPrice(), stock.getChange(), stock.getChangePercent()));
        db.addStock(stock);
        adapter.notifyDataSetChanged();
        //problem is here. we need to let searchAllStocks in adapter know when stock is added
        //so that searchbar can store new stock into searchAllStocks list
    }
}

那么现在让我来给u介绍一下我的app是什么样的。

1. 这是主页，在这里我已经添加了3只股票