How to programmatically change the color of a Floating Button in Kotlin

In this android kotlin programming source code example, we are going to programmatically change the color of a Floating Button 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 the color of a Floating Button 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Button.ButtonActivity4">

    <androidx.appcompat.widget.AppCompatTextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="#1F1F1F"
        android:text="Changing fab background"
        android:gravity="center"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/faBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:src="@android:drawable/ic_menu_share"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import android.content.res.ColorStateList
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.core.content.ContextCompat
import com.bluapp.kotlinview.R
import com.google.android.material.floatingactionbutton.FloatingActionButton

class ButtonActivity4 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_button4)
        val faBtn = findViewById<FloatingActionButton>(R.id.faBtn) as FloatingActionButton
        faBtn.backgroundTintList= ColorStateList.valueOf(getColor(R.color.colorPrimaryDark))
    }
}

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