How to apply shape and selector simultaneously for Button?

Question

I have applied a shape for a button like:

Answer 1

My example is a circle button with state_pressed. code bellow:

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


    <item android:state_pressed="true">
        <shape android:shape="oval">
            <solid android:color="@color/light_primary_color" />
        </shape>

    </item>
    <item>
        <shape android:shape="oval">
            <solid android:color="@color/accent_color" />
        </shape>
    </item>

</selector>

Answer 2

shape.xml

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="@color/star_off"/>
    <corners android:radius="5dp"/>
    <padding android:left="0dp" android:top="0dp" android:right="0dp" android:bottom="0dp" />
</shape>

selector.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android" android:exitFadeDuration="@android:integer/config_mediumAnimTime">

    <item android:drawable="@color/tab_focused" android:state_focused="true" android:state_pressed="false"/>
    <item android:drawable="@color/tab_pressed" android:state_pressed="true"/>
    <item android:drawable="@drawable/shape"/>

</selector>

Answer 3

To be more reusable, you can set states on single properties. Avoid duplicating your shapes

<selector
    xmlns:android="http://schemas.android.com/apk/res/android"
>
    <item>
        <shape android:shape="rectangle" >
            <corners android:radius="5dp"/>
            <solid
                android:state_enabled="false"
                android:color="@color/transparent"
            />
            <solid
                android:state_enabled="true"
                android:color="@color/background"
            />
            <stroke
                android:width="@dimen/dividerHeight"
                android:color="@color/dividerLight"
            />
        </shape>
    </item>
</selector>

I was able to set background programmatically once disabled using this method.