[Kotlin] SpannableStringBuilder

문자열에서 특정 문자의 색상, 스타일을 바꾸고싶다.

---

SpannableStringBuilder

setSpan()

ForegroundColorSpan(Color.RED)

Spannable.SPAN_EXCLUSIVE_EXCLUSIVE

StyleSpan(Typeface.BOLD)

UnderlineSpan()

RelativeSizeSpan(1.5f)

BackgroundColorSpan(Color.CYAN)

Spannable.SPAN_EXCLUSIVE_INCLUSIVE

SpannableStringBuilder.insert(36, "INCLUSIVE")

---

 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/tv_"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="26sp"
        android:gravity="center"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="RED BLUE NORMAL BOLD UNDERLINE SIZE CYAN SIZE AND MAGENTA GREEN INCLUSIVE" />

</androidx.constraintlayout.widget.ConstraintLayout>

activity_main.xml

 

 

MainActivity.kt

package com.example.spannableexample

import android.graphics.Color
import android.graphics.Typeface
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.text.Spannable
import android.text.SpannableStringBuilder
import android.text.TextPaint
import android.text.style.*
import android.widget.TextView
import androidx.annotation.ColorInt

class MainActivity : AppCompatActivity() {

    private val tv: TextView by lazy {
        findViewById(R.id.tv_)
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val ssb = SpannableStringBuilder("RED BLUE NORMAL BOLD UNDERLINE SIZE CYAN SIZE AND MAGENTA GREEN")
        ssb.apply {
            setSpan(ForegroundColorSpan(Color.RED), 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
            setSpan(ForegroundColorSpan(Color.BLUE), 4, 8, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
            setSpan(StyleSpan(Typeface.BOLD), 16, 20, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
            setSpan(UnderlineSpan(), 21, 30, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
            // 폰트 사이즈 50% 커짐
            setSpan(RelativeSizeSpan(1.5f), 31, 35, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
            setSpan(BackgroundColorSpan(Color.CYAN), 36, 40, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
            setSpan(RelativeSizeColorSpan(1.5f, Color.MAGENTA), 41, 57, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
            setSpan(ForegroundColorSpan(Color.GREEN), 58, 63, Spannable.SPAN_EXCLUSIVE_INCLUSIVE)
            insert(63, " INCLUSIVE")
        }

        tv.text = ssb
    }

    /** 사이즈랑 색상 둘 다 동시에 설정하고 싶어 */
    inner class RelativeSizeColorSpan(
        size: Float,
        @ColorInt private val color: Int
    ) : RelativeSizeSpan(size) {
        override fun updateDrawState(textPaint: TextPaint) {
            super.updateDrawState(textPaint)
            textPaint.color = color
        }
    }

}

실행 결과