How to dynamically change TextView background color in Kotlin

In this android kotlin source code example, we are going to programmatically change TextView background color in Kotlin.

You can copy and adopt this source code example to your Kotlin android project without reinventing the wheel.

Below is a step by step source code to programmatically change TextView background color in Kotlin.

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:id="@+id/constraintLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".TextViewAndRadioButton.TextViewAndRadioButtonActivity6">

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import android.graphics.Color
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.Gravity
import android.view.ViewGroup
import android.widget.TextView
import androidx.constraintlayout.widget.ConstraintLayout
import androidx.constraintlayout.widget.ConstraintSet
import com.bluapp.kotlinview.R

class TextViewAndRadioButtonActivity6 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_text_view_and_radio_button6)
        val constraintLayout = findViewById(R.id.constraintLayout) as ConstraintLayout
        val conParam = ConstraintLayout.LayoutParams(
            ViewGroup.LayoutParams.MATCH_PARENT,
            ViewGroup.LayoutParams.WRAP_CONTENT
        )
        conParam.topToTop = ConstraintSet.PARENT_ID
        conParam.bottomToBottom = ConstraintSet.PARENT_ID
        conParam.startToStart = ConstraintSet.PARENT_ID
        conParam.endToEnd = ConstraintSet.PARENT_ID
        val textview = TextView(this)
        textview.text = "Hello World"
        textview.gravity = Gravity.CENTER
        textview.setTextColor(Color.WHITE)
        textview.setBackgroundColor(resources.getColor(R.color.colorAccent))
        constraintLayout.addView(textview, conParam)
    }
}

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