How to highlight a button when is pressed?

Question

I'm making an Andorid quiz and I want to highlight a button when it's clicked but when the user lets go of the button that it turns in it original colour. You see I've set the background of the button so the buttons can be rounded. I've set that in drawable.

<Button
    android:id="@+id/btn1"
    android:background="@drawable/roundedbutton"
    android:textColor="#ffffff"
    android:textStyle="italic"
    android:layout_width="225sp"
    android:layout_marginTop="23sp"
    android:layout_height="38sp"
    android:layout_alignLeft="@+id/btn2"
    android:layout_below="@+id/textView1"
    android:text="Button" />

roundedbutton.xml

<?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
 android:shape="rectangle" android:padding="10dp">   
<solid android:color="#848482"/> <!-- this one is ths color of the Rounded Button -->

<corners
android:bottomRightRadius="6.5dp"
android:bottomLeftRadius="6.5dp"
android:topLeftRadius="6.5dp"
android:topRightRadius="6.5dp"/>
</shape>

Answer 1

If you don't want to create 2 drawables with a selector xml, or 2 shapes or even don't want to bother doing it programmatically with a color filter, you can use the Android built-in highlight by ussing the selectableItemBackground attibute :

<!-- Background drawable for bordered standalone items that need focus/pressed states. -->
<attr name="selectableItemBackground" format="reference" />

in your xml. For instance :

<ImageButton
   android:id="@+id/btn_help"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:src="@drawable/ic_help"
   android:background="?android:selectableItemBackground"/>

Answer 2

If you want to do it programmatically then you can also try one of following two methods:

btn1.getBackground().setColorFilter(new LightingColorFilter(0xFFFFFFFF, 0xFFAA0000));

or this way:

btn1.getBackground().setColorFilter(0xFFAA4400,PorterDuff.Mode.MULTIPLY);

just put this code in your onCreate method of activity and it will do. You can change the color codes according to your choice.