Text Color of a Substring - Android Studio - Kotlin

We will change the color of some sub-strings of text of TextView using the ''SpannableString'', and "ForeGroundColorSpan" classes using Android Studio IDE and Java language
✓RED
✓GREEN
✓BLUE
Check For Java

VIDEO

Step 1: Create a new Project or open new project

Step 2: Code

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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/text_view"
        android:textSize="20sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

MainActivity.kt

package com.blogspot.atifsoftwares.textcolor_kotlin

import android.graphics.Color
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.text.SpannableString
import android.text.Spanned
import android.text.style.ForegroundColorSpan
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

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

        //text to set in TextView
        val mText = "Let's color some substrings: RED color, GREEN color, and BLUE color"

        //creating spannable string from normal string
        //we will use it to apply foregroundcolorspan to substrings
        val mSpannableString = SpannableString(mText)

        //color styles to apply on substrings
        val mRed = ForegroundColorSpan(Color.RED) //red color
        val mGreen = ForegroundColorSpan(Color.GREEN) //green color
        val mBlue = ForegroundColorSpan(Color.BLUE) //blue color

        //applying color styles to substrings
        mSpannableString.setSpan(mRed, 29, 32, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
        mSpannableString.setSpan(mGreen, 38, 46, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
        mSpannableString.setSpan(mBlue, 56, 61, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)

        //setting text to the textview
        text_view.text = mSpannableString
    }
}

Step 3: Run Project

Output