Android Button background color not changing on xml

Issue

• Android Stidio 4.1.1
  • SDK 29 (Android 10)

I trying to change button background color on xml, but it doesn't changed.

here's my code

<LinearLayout 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"
    android:orientation="vertical">

<Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#ff0000"/>

</LinearLayout>

enter image description here

I think it might be work fine, but it still purple color :(

Solution

if you are using Android Studio 4.1.1 you are probably using Theme.MaterialComponents check your themes.xml file

so you have to use this attribute

android:backgroundTint="#ff0000"

read this documentation for more information:

https://material.io/components/buttons

If you insist on using android:background you can change your button xml code like this to force it using appcompat :

<androidx.appcompat.widget.AppCompatButton
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="#ff0000"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

or you can change the theme of all your project by changing the theme in themes.xml like this:

I hope this is useful.

Answered By - Ma Jeed