将列表视图上的文本粗体设置为动态指定单词

时间:2015-05-30 11:10:04

标签: java android listview arraylist spannable

我正在尝试将颜色和粗体添加到与ArrayList项目/值中的句子匹配的单词上。到目前为止我所做的事情如下......所以我有一个名为filter" Hello"现在我想遍历ArrayList itemList并找到" Hello"从ArrayList项目中,使其变为粗体和蓝色。

String filter = "Hello";
    String itemValue = "I just want to say Hello world! Hello";

    itemList = new ArrayList<String>();
    for(int i = 0; i<10; i++)
    {
        itemList.add("I just want to say Hello world! Hello");
    }
    sentence = new ArrayList<String>();
    for(int j=0; j<itemList.size(); j++)
    {
        int startPos = itemList.get(j).toString().toLowerCase(Locale.US).indexOf(filter.toLowerCase(Locale.US));
        int endPos = startPos + filter.length();

        if (startPos != -1) // This should always be true, just a sanity check
        {
            Spannable spannable = new SpannableString(itemValue);
            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);
            tv.setText(spannable);

            sentence.add(itemValue);

            ListView lv = (ListView)findViewById(R.id.listView1);
            //ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
              //      android.R.layout.simple_list_item_1, android.R.id.text1, sentence);
            MyPerformanceArrayAdapter adapter = new MyPerformanceArrayAdapter(this, spannable, counterArrayList);
            lv.setAdapter(adapter);
        }
        else
            tv.setText(itemValue);                 
    }             

它无法正常工作,请你帮助我

1 个答案:

答案 0 :(得分:3)

你应该让另一个构造函数传递另一个参数String filter,它将包含你的字符串为粗体。

将其分配给arrayAdapter

中的其他数据成员

现在在显示视图时 你应该在每个句子中替换filter。即sentence.replace(filter, "<b>" + filter + "</b>")

并将其显示在textView中,如myTextView.setText(Html.fromHtml(sentence));

之后您需要做的就是重置适配器