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Android Implementing Designs for Android Customizing the Login Screen Customizing Buttons

A bit confused on how to change a default button background color

pleas help

activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <Button
        android:id="@+id/saveButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="@string/save_label" 
            android:background="@drawable/button_custom"/>

</RelativeLayout>
button_custom.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:drawable="@android:color/darker_gray"
        android:state_pressed="true"/>
    <item
        android:drawable="@android:color/holo_blue_light"
        android:state_focused="true"/>

    <item android:drawable="@android:color/holo_red_light"
          android:background="@android:color/white"/>

</selector>

2 Answers

Well since you're not told in which state you should change the color, it's logical to do it in it's normal state. Meaning you've oriented right, but you didn't write the right code. It's not as complex as you think. You should just change this:

<item android:drawable="@android:color/holo_red_light" />

to this

<item android:drawable="@android:color/white" />

You should not change the background color of a button directly by accessing the following property:

android:background

Doing so, you will lose any user interactive animations that come standard in API 21+. For complete compatibility and to maintain Material Design animations in buttons, target the following property:

android:backgroundTint