如何使用 kotlin 检测/定义字符串样式？

Question

我想知道如何检测来自 textView 的字符串是否以粗体书写。

例如：

textView.text = "I love Stackoverflow" // 你应该在 TextView 中看到的内容

它必须返回一个只包含 BOLD TEXT 的字符串：

if ( textView.text.style is BOLD) then //that's just an Algorithm to explain
myString = "Stackoverflow"

Answer 1

尝试使用跨度。

        val tv = TextView(this)
        tv.text = Html.fromHtml("I love <b>Stack</b><i>Overflow</i><b>!!!</b>", Html.TO_HTML_PARAGRAPH_LINES_CONSECUTIVE)
        val spannedString = tv.text as SpannedString
        val allSpans = spannedString.getSpans(0, tv.text.length, Any::class.java)

        //You can check spans; Please check that your span is StyleSpan
        ((allSpans as Array<Object>)[0] as StyleSpan).style == Typeface.BOLD //<b>Stack</b>
        ((allSpans as Array<Object>)[1] as StyleSpan).style == Typeface.ITALIC //<i>Overflow</i>
        ((allSpans as Array<Object>)[2] as StyleSpan).style == Typeface.BOLD //<b>!!!</b>

        //or get start and end
        spannedString.getSpanStart(((allSpans as Array<Object>)[0] as StyleSpan)) //start index of "Stack"
        spannedString.getSpanEnd(((allSpans as Array<Object>)[0] as StyleSpan)) //end index of "Stack"

最后，你可以得到开始和结束之间的子字符串

更新

                val spannedString = Html.fromHtml("" +
                "<b>1. Quels sont les facteurs de risque de la maladie athéromateuse ?</b><br>" + //BOLD 0
                "<b>a. Tabac</b><br>" + //BOLD 1
                "<b>b. hypertension artérielle</b><br>" + //BOLD 2
                "c. alcool<br>" +
                "d. Hypertriglycéridémie<br>" +
                "e. diabète<br>" +
                "<br>" +
                "<b>2. Parmi les facteurs de risque cardio-vasculaire, on ne retrouve pas :</b><br>" + //BOLD 3
                "a. Hypercholestérolémie<br>" +
                "b. <b>Insuffisance rénale</b><br>" + //BOLD 4
                "c. Tabagisme actif<br>" +
                "d. Sédentarité<br>" +
                "e. Sexe masculin<br>" +
                "3. Le tableau de dissection aiguë de l&#39;aorte ne comporte pas de :<br>" +
                "a. Hémopéricarde<br>" +
                "b. insuffisance mitrale aiguë<br>" +
                "c. Hémothorax<br>" +
                "d. Accident vasculaire cérébral<br>" +
                "e. Paraplégie", Html.TO_HTML_PARAGRAPH_LINES_CONSECUTIVE)


        // Find All bold substrings
        val allBoldSpans = spannedString.getSpans(0, spannedString.length, Any::class.java).filter {
//This is BOLD span?
            it is StyleSpan && it.style == Typeface.BOLD
        }

        val ONLY_BOLD_SUBSTRINGS = allBoldSpans.map {
//Extract BOLD text into output collection
            spannedString.substring(spannedString.getSpanStart(it), spannedString.getSpanEnd(it))
        }

it will return array with

    0 = "1. Quels sont les facteurs de risque de la maladie athéromateuse ?"
    1 = "a. Tabac"
    2 = "b. hypertension artérielle"
    3 = "2. Parmi les facteurs de risque cardio-vasculaire, on ne retrouve pas :"
    4 = "Insuffisance rénale"