Button - Change background color on click

Question

I have 8 buttons in my activity. What I am looking for is, The buttons have a default background and when a button is clicked, the background color should change to some other color. This part is pretty straight forward. But, when I click on any other button, the background color of the first button should change back to default color. I understand that this will be done using "selector states", but I am not quite sure of how to implement it. The more i read about it, the more confused I am.

Right now, the xml that I have is as follows: in drawable folder

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

    <item android:drawable="@color/blue" android:state_pressed="true"/>
    <item android:drawable="@color/dark_grey" android:state_focused="true"/>  
    <item android:drawable="@drawable/image_border"/>

 </selector>

the drawable/image_border in the xml is used to define shape for the button. Below is the image_border.xml

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >

    <solid android:color="@color/dark_grey" />

    <stroke
        android:width="4dp"
        android:color="@color/light_grey" />

    <padding
        android:bottom="1dp"
        android:left="1dp"
        android:right="1dp"
        android:top="1dp" />

</shape>

Can someone help me with how to change the xml to behave the way I need it to be?

[EDIT 1]

All the below answers are pointing towards similar kind of solution. Here are the changes that I did. But, still, when i press the button, it turns to the specified color but immediately turns back to the default color.

button_background_blue.xml

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

    <item android:drawable="@drawable/image_border_blue" android:state_pressed="true"/>
    <item android:drawable="@color/dark_grey" android:state_focused="true"/>  
    <item android:drawable="@drawable/image_border"/>

 </selector>

image_border_blue.xml

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >

    <solid android:color="@color/blue" />

    <stroke
        android:width="4dp"
        android:color="@color/blue" />

    <padding
        android:bottom="1dp"
        android:left="1dp"
        android:right="1dp"
        android:top="1dp" />

</shape>

Any thoughts?

Answer 1

use this selector & put it in drawable folder & set button background to this selector.

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

<item android:drawable="@color/blue" android:state_pressed="true"/>
<item android:drawable="@color/AliceBlue" android:state_focused="true"/>  
<item android:drawable="@color/Azure"/>

 </selector>

OR You can use Color instead of Background. hope it helps.