Question

I have a imagebutton with a image source with transparency, but the background color of the imagebutton is the tipical gray button color.

I want set background = @null and this works fine.

But, when i press this imagebutton i can not see the color that indicates that I am pressing the button.

if i remove background = @null when i pressing the button, change the color for the user know you are pressing.

I read that you can make a xml with 3 images specifying when the button is pressed, when this normal and when it has focus. But I think exists an easier way to do.

Answer 1

Following the above answers, use a selector drawable(for the background, instead of null) that has the default state set to a transparent color:

*selector_with_transparency:*

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

    <item android:state_pressed="true" android:drawable="@drawable/pressed" />
    <item android:drawable="@drawable/transparent" />

</selector>

pressed:

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

    <solid android:color="#0077cc" />

</shape>

transparent:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
    <solid android:color="#00000000"/>

</shape>

and then for the ImageButton:

background = "@drawable/selector_with_transparency"