Android的TextView匹配子串并改变子串的字体颜色（所有存在的子串）

一、完全匹配指定字符串并改变指定字符串在TextView中的颜色

 /**
     * @description 改变TextView的部分字体颜色
     * @date: 2021/6/17 9:44
     * @param view 要改变字体颜色的TextView
     * @param textColor 字体颜色
     * @param allString 整串字符串
     * @param partString 要改变颜色的部分字符串
     */
    fun showPartTextColor(
        view: TextView,
        textColor: Int,
        allString: String,
        partString: String
    ) {
        val spannableStringBuilder = SpannableStringBuilder(allString)
        for (index in allString.indices) {
            var start = allString.indexOf(partString, index)
            var end = start + partString.length
            if (start != -1) {
                spannableStringBuilder.setSpan(
                    ForegroundColorSpan(textColor),
                    start,
                    end,
                    Spannable.SPAN_EXCLUSIVE_INCLUSIVE
                )
            }
        }

        view.text = spannableStringBuilder
    }

二、匹配第一个子串，并根据子串的数量设置不同子串的不同字体颜色

/**
     * @description
     * @date: 2021/6/17 10:44
     * @param view 要设置的TextView
     * @param textColors 颜色列表
     * @param allString 全字符串
     * @param partStrings 要变颜色的字符串列表
     * @return
     */
    fun showPartTextColors(
        view: TextView,
        textColors: Array<Int>,
        allString: String,
        partStrings: Array<String>
    ) {
        val spannableStringBuilder = SpannableStringBuilder(allString)
        var len = textColors.size
        for (index in 0 until len) {
            var partStr = partStrings[index]
            var start = allString.indexOf(partStr)
            var end = start + partStr.length
            if (start != -1) {
                spannableStringBuilder.setSpan(
                    ForegroundColorSpan(textColors[index]),
                    start,
                    end,
                    Spannable.SPAN_EXCLUSIVE_INCLUSIVE
                )
            }
        }
        view.text = spannableStringBuilder
    }