android - 适配器错误中的 TextView.setText()

Question

我有一个自定义适配器扩展 ArrayAdapter。这是我在 getView 中的一段代码:

if(searchBy.equalsIgnoreCase("title") == true)
{
    holder.title.setText(currItem.getTitle());
}
else if(searchBy.equalsIgnoreCase("publisher") == true)
{
    holder.title.setText(currItem.getPublisher().getName());
}

问题出在第二if。每次代码输入第二个 if 时，textview 的文本变为空(根本没有文本)。

我调试并记录了我的应用程序，以确保代码进入第二个 if。现在，我尝试了这样的事情:

if(searchBy.equalsIgnoreCase("title") == true)
{
    holder.title.setText(currItem.getTitle());
}
else if(searchBy.equalsIgnoreCase("publisher") == true)
{
    holder.title.setText("TEST");
}

如果第二个中的“TEST”从未显示，textview 将像以前一样显示一个空字符串。

然后，我尝试反转这两个 if :

if(searchBy.equalsIgnoreCase("title") == true)
{
    holder.title.setText(currItem.getPublisher().getName());
}
else if(searchBy.equalsIgnoreCase("publisher") == true)
{
    holder.title.setText(currItem.getTitle());
}

当从第一个 if 调用代码 holder.title.setText(currItem.getTitle()); 时，它运行良好。但是，当它从第二个 if 调用时，错误出现了。 textview 是空的。

我以前从未遇到过这样的事情，我一直在努力解决这个问题。

这是我的完整 getView :

@Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

        View row = convertView;
        LinearLayout categoryWrapper;
        Holder holder = null;
        if (row == null) {
            LayoutInflater inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            row = inflater.inflate(layoutResourceId, null);

            holder = new Holder();
            holder.title = (TextView) row.findViewById(R.id.autocomplete_result_item_title);
            holder.category = (TextView) row.findViewById(R.id.autocomplete_item_category);
            holder.line1 = (View) row.findViewById(R.id.autocomplete_line_1);
            holder.line2 = (View) row.findViewById(R.id.autocomplete_line_2);
            holder.line3 = (View) row.findViewById(R.id.autocomplete_line_3);
            row.setTag(holder);
        } else {
            holder = (Holder) row.getTag();
        }

        categoryWrapper = (LinearLayout) row.findViewById(R.id.autocomplete_category_wrapper);
        final PurchasedItem currItem = getItem(position);

        if(isStore == true)
        {
            currCategory = currItem.getBook_types();
            prevItem = (position == 0) ? null : getItem(position-1).getBook_types();
        }
        else
        {
            currCategory = currItem.getCategory().getName();
            prevItem = (position == 0) ? null : getItem(position-1).getCategory().getName();
        }

        if(searchBy.trim().equalsIgnoreCase("title") == true)
        {
            Log.d("auto1", currItem.getTitle());
            holder.title.setText(currItem.getTitle());
            //text = currItem.getTitle();
            //holder.title.setText(currItem.getPublisher().getName());
            //holder.title.setText("asd");
        }
        else if(searchBy.trim().equalsIgnoreCase("publisher") == true)
        {
            Log.d("auto2", currItem.getPublisher().getName());
            holder.title.setText(currItem.getPublisher().getName());
            //text = currItem.getPublisher().getName();
            //holder.title.setText("asd");
        }
        /*else if(searchBy.equalsIgnoreCase("author") == true)
        {
            holder.title.setText(currItem.getAuthor_name());
            //text = currItem.getAuthor_name();
        }*/

        //holder.title.setText(currItem.getTitle());

        if(source != 2 && source != 3)
        {
            holder.category.setVisibility(View.VISIBLE);

            holder.category.setText((currCategory.equalsIgnoreCase("magazine"))?"Magazine":(currCategory.equalsIgnoreCase("newspaper"))?"Newspaper":(currCategory.equalsIgnoreCase("book"))?"Book":"Apps");

            if (position == 0) {
                categoryWrapper.setVisibility(View.VISIBLE);
            } else 
            {
                if (currCategory.equals(prevItem))
                    categoryWrapper.setVisibility(View.GONE);
                else
                    categoryWrapper.setVisibility(View.VISIBLE);
            }
        }
        else
        {
            holder.category.setVisibility(View.GONE);
        }

        // atur line
        if (position < getCount()- 1)
            holder.line3.setVisibility(View.GONE);
        else
            holder.line3.setVisibility(View.VISIBLE);

        row.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent n = new Intent(getContext(), SearchActivity.class);
                n.putExtra("keyword", currItem.getTitle());
                n.putExtra("source", source);
                /*searchby selalu title, karena meskipun user search by publisher, hasil di
                library activity berfokus pada title*/
                n.putExtra("categoryKeyword", "title");
                n.putExtra("type", category);
                getContext().startActivity(n);
            }
        });

        return row;
    }

请帮助我。

Answer 1

每当你比较一个字符串时，你应该总是使用 trim() 方法来避免空格。

试试这个，

if(searchBy.trim().equalsIgnoreCase("title") == true)
{
    holder.title.setText(currItem.getPublisher().getName());
}
else if(searchBy.trim().equalsIgnoreCase("publisher") == true)
{
    holder.title.setText(currItem.getTitle());
}