突出显示自定义适配器列表视图中的搜索文本

Question

我有一个列表视图,想要从中搜索文本.我已成功完成,但现在我想搜索项目并在列表视图中突出显示搜索到的文本.这是我在ListViewAdapter中的过滤器函数:

public void filter(String charText) {

    charText = charText.toLowerCase(Locale.getDefault());
    worldpopulationlist.clear();
    if (charText.length() == 0) {
        worldpopulationlist.addAll(arraylist);
    } 
    else 
    {
        for (WorldPopulation wp : arraylist) 
        {
            // Find charText in wp
            int startPos = wp.getCountry().toLowerCase(
                    Locale.getDefault()).indexOf(charText.toLowerCase(Locale.getDefault()));
            int endPos = startPos + charText.length();
            if (startPos != -1) 
            {
                   Spannable spannable = new SpannableString(wp.getCountry());
                    ColorStateList blueColor = new ColorStateList(new int[][] { new int[] {}}, new int[] { Color.BLUE });
                    TextAppearanceSpan highlightSpan = new TextAppearanceSpan(null, Typeface.BOLD, -1, blueColor, null);

                    spannable.setSpan(highlightSpan, startPos, endPos, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
                   //    countryTextView.setText(spannable);
                    worldpopulationlist.add(wp);

            }

        }
    }
    notifyDataSetChanged();

}

我用Google搜索了,我知道Spannable用于此目的,但它不起作用.如果您需要任何其他相关代码,请帮助我并告诉我.

编辑:

我所遵循的教程就是从这里开始的.我使用相同的代码进行了一些小的更改.我只是想在列表视图中突出显示搜索到的文本(在这种情况下只有一个项目,例如国家/地区).

Answer 1

好吧,我下载了示例项目,最后得到了以下内容.根据您的需求调整代码.

在您的过滤器方法中,存储用于执行过滤器的字符串:

// Filter Class
public void filter(String searchString) {
    this.searchString = searchString;
    ...
    // Filtering stuff as normal.
}

您必须声明一个成员字符串来存储它:

public class ListViewAdapter extends BaseAdapter {
    ...    
    String searchString = "";
    ...

并且,在getView您突出显示搜索词:

public View getView(final int position, View view, ViewGroup parent) {
    ...
    // Set the results into TextViews
    WorldPopulation item = worldpopulationlist.get(position);
    holder.rank.setText(item.getRank());
    holder.country.setText(item.getCountry());
    holder.population.setText(item.getPopulation());

    // Find charText in wp
    String country = item.getCountry().toLowerCase(Locale.getDefault());
    if (country.contains(searchString)) {
        Log.e("test", country + " contains: " + searchString);
        int startPos = country.indexOf(searchString);
        int endPos = startPos + searchString.length();

        Spannable spanText = Spannable.Factory.getInstance().newSpannable(holder.country.getText()); // <- EDITED: Use the original string, as `country` has been converted to lowercase.
        spanText.setSpan(new ForegroundColorSpan(Color.RED), startPos, endPos, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

        holder.country.setText(spanText, TextView.BufferType.SPANNABLE);
    }
    ...
}

希望能帮助到你.