highlightKeywords - highlight Specific word in Sentence / String

highlightKeywords

/**
 * @author Gideon
 *
 * @see "https://medium.com/androiddevelopers/spantastic-text-styling-with-spans-17b0c16b4568"
 * @see "https://stackoverflow.com/a/65000483"
 * @see SpanType -> enum type of Span
 *
 *
 * @param highlightColor -> TIDAK WAJIB, keyword akan di rubah ke warna ini
 * @param message - > WAJIB Di ISI, merupakan kalimat yang akan di tampilkan di text
 * @param keywords -> WAJIB Di ISI, keyword (kata / karakter) yang akan di ubah
 * @param proportion -> TIDAK WAJIB, mengganti Ukuran Keyword
 * @param type -> TIDAK WAJIB, default mengubah keyword menjadi BOLD
 *
 *
 */

fun TextView.highlightKeywords(
    highlightColor: Int = ContextCompat.getColor(
        context,
        androidx.appcompat.R.color.accent_material_light
    ),
    message: String,
    keywords: List<String>,
    proportion: Float = 1f,
    spanType: SpanType = SpanType.BOLD
){
    val spannableString = SpannableString(message)
    keywords.forEach { keyword ->
        if (keyword.isNotBlank()) {
            var startIndex = message.lowercase().indexOf(keyword.lowercase())

            while (startIndex >= 0) {
                spannableString.setSpan(
                    when (spanType) {
                        SpanType.FOREGROUND -> ForegroundColorSpan(highlightColor)
                        SpanType.RELATIVE -> RelativeSizeSpan(proportion)
                        SpanType.QUOTE -> QuoteSpan(highlightColor)
                        SpanType.BOLD -> StyleSpan(Typeface.BOLD)
                    },
                    startIndex,
                    startIndex + keyword.length,
                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
                )
                startIndex = message.lowercase().indexOf(keyword.lowercase(), startIndex + keyword.length)
            }
        }
    }
    text = spannableString
}


/**
*
*
* Example Usage 
*  binding?.apply {
            with(tvTitle) {
                highlightKeywords(
                    message = "Hello World, and Hello to all my Hello Friends.",
                    keywords = listOf("l"),
                    highlightColor = Color.RED,
                    spanType = SpanType.FOREGROUND
                )
            }
        }
*
**/