Develop Reference

Shape not getting applied to Button Selector in Android

Shape Radius defined in xml is not getting applied to Button Focus & Pressed state.
I have
instagram_button_style.xml as below:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/instagram_button_shape" android:state_focused="true" android:textColor="#color/colorAccent" />
<item android:drawable="#drawable/instagram_button_shape" android:state_pressed="true" android:textColor="#color/colorAccent" />
<item android:drawable="#color/colorButton" />
</selector>
and My instagram_button_shape.xml as:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="30dp" />
<solid android:color="#color/colorButton" />
</shape>
</item>
<item android:drawable="#drawable/instagram_gradient" >
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="30dp" />
</shape>
</item>
</layer-list>
Where
instagram_gradient is a jpg image
Using it in button like :
android:background="#drawable/instagram_button_style"
My Initial Button State:
My Pressed Button State
Expectation: I was expecting pressed state to have oval button, but Radius is not getting applied.
FINAL Update:
At last, after numerous research I ended up changing my .JPG gradient file to android_gradient shape file.

You need to set android:radius="30dp" in your #drawable/instagram_gradient
Try this way
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<Button
android:id="#+id/tvKioskMode"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:background="#drawable/instagram_button_style"
android:padding="10dp"
android:text="OPEN IN"
android:textColor="#android:color/white"
android:textStyle="bold"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
drawable/instagram_button_style
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/instagram_button_shape" android:state_selected="true" android:textColor="#color/colorAccent" />
<item android:drawable="#drawable/instagram_button_shape" android:state_pressed="true" android:textColor="#color/colorAccent" />
<item android:drawable="#drawable/normal_button" />
</selector>
#drawable/instagram_button_shape
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="30dp" />
<solid android:color="#color/colorPrimary" />
</shape>
</item>
<item android:drawable="#drawable/instagram_gradient" >
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="30dp" />
</shape>
</item>
</layer-list>
#drawable/normal_button
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="30dp" />
<solid android:color="#color/colorAccent" />
</shape>
#drawable/instagram_gradient
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
<gradient
android:angle="90"
android:centerColor="#00E5FF"
android:endColor="#FF1744"
android:startColor="#3D5AFE"
android:type="linear" />
<corners
android:radius="30dp"/>
</shape>
OUTPUT
UPDATE
#drawable/instagram_button_style
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/instagram_button_shape" android:state_selected="true" android:textColor="#color/colorAccent" />
<item android:drawable="#drawable/instagram_button_shape" android:state_pressed="true" android:textColor="#color/colorAccent" />
<item android:drawable="#drawable/normal_button" />
</selector>
#drawable/instagram_button_shape
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="30dp" />
<solid android:color="#color/colorPrimary" />
</shape>
</item>
<item android:drawable="#drawable/my_gradient"/>
</layer-list>
#drawable/my_gradient
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="30dp" />
</shape>
</item>
<!--add here your instagram image-->
<item
android:drawable="#drawable/insta_gradient_image"
android:bottom="30dp"
android:left="30dp"
android:right="30dp"
android:top="30dp"/>
</layer-list>
#drawable/normal_button
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="30dp" />
<solid android:color="#color/colorAccent" />
</shape>

try this to change instagram_button_shape.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<corners android:radius="30dp" />
<solid android:color="#color/colorButton" />
</shape>
</item>
<item
android:bottom="30dp"
android:drawable="#drawable/instagram_gradient"
android:left="30dp"
android:right="30dp"
android:top="30dp">
<shape android:shape="rectangle">
<solid android:color="#color/colorButton" />
<corners android:radius="30dp" />
</shape>
</item>
</layer-list>

The <layer-list> has items, and you define this item incorrectly:
<item android:drawable="#drawable/instagram_gradient">
<shape android:shape="rectangle">
<corners android:radius="30dp" />
</shape>
</item>
Indeed, android:drawable defines the Drawable used to render the layer. The nested shape is just ignored.
You have three options to reach your goal:
use a shape with a gradient, and remove the android:drawable="#drawable/instagram_gradient"
use a PNG with transparency and rounded corners for the the #drawable/instagram_gradient
and of course implement a custom Drawable

The simplest way is wrap your button with CardView. It has property called CornerRadius. That way you can round your button into custom corner shape.

Try this Updated,
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/instagram_button_shape"
android:state_selected="true" />
<item android:drawable="#drawable/instagram_button_shape" />
<item android:drawable="#color/colorButton" />
</selector>
now, when you click this botton set
buttonId.setSelected(true);

Android custom radiobutton

I want to make custom radio button.I have created a drawable for normal(radio_normal) state.But I find it difficult to create a shape for checked state(radio_pressed).I have tried creating my desired way.But didn't work out well.I don't know if I have done it the right way.For checked state the shape should look like this.The outer border and the inner circle must be white in color.Can anybody help me with that?
radio_normal:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="ring"
android:useLevel="false">
<solid
android:color="#2196f3"></solid>
</shape>
radio_pressed:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="oval"
xmlns:android="http://schemas.android.com/apk/res/android">
<solid
android:color="#android:color/transparent">
</solid>
<size
android:height="60dp"
android:width="60dp">
</size>
<stroke
android:color="#ffffff"
android:width="1dp"
>
</stroke>
</shape>
</item>
<item>
<shape android:shape="oval">
<solid
android:color="#ffffff">
</solid>
</shape>
<size
android:height="30dp"
android:width="30dp">
</size>
</item>
</layer-list>
radio_bg:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_checked="true"
android:drawable="#drawable/radio_pressed"
>
</item>
<item
android:state_checked="false"
android:drawable="#drawable/radio_normal"
>
</item>
</selector>
activity_main:
<RadioButton
android:id="#+id/radio"
android:layout_centerInParent="true"
android:layout_width="10dp"
android:button="#drawable/radio_bg"
android:layout_marginTop="100dp"
android:layout_height="10dp"
/>

This is about as close as I can get you, hope it works on your side and that it helps :)
radio_normal:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="ring"
android:useLevel="false">
<solid android:color="#2196f3" />
<size
android:width="25dp"
android:height="25dp" />
</shape>
radio_pressed:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" android:padding="3dp">
<item>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="ring"
android:useLevel="false">
<solid android:color="#android:color/white" />
<size
android:width="25dp"
android:height="25dp" />
</shape>
</item>
<item
android:bottom="7dp"
android:left="7dp"
android:right="7dp"
android:top="7dp">
<shape
android:shape="oval"
android:useLevel="false">
<solid android:color="#android:color/white" />
</shape>
</item>
</layer-list>
radio_bg:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_checked="true"
android:drawable="#drawable/radio_pressed"
>
</item>
<item
android:state_checked="false"
android:drawable="#drawable/radio_normal"
>
</item>
</selector>
activity_main:
<RadioButton
android:id="#+id/radio"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="100dp"
android:button="#drawable/radio_bg"/>
Let me know if this worked for you :)

Is this maybe what you were looking for ?
radio_pressed:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="ring"
android:useLevel="false">
<solid android:color="#android:color/white" />
<size
android:width="10dp"
android:height="10dp" />
</shape>
</item>
<item
android:bottom="3dp"
android:left="3dp"
android:right="3dp"
android:top="3dp">
<shape
android:shape="oval"
android:useLevel="false">
<solid android:color="#android:color/white" />
</shape>
</item>
</layer-list>
Reaction to comment:
The code:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="ring"
android:useLevel="false">
<solid android:color="#android:color/white" />
<size
android:width="150dp"
android:height="150dp" />
</shape>
</item>
<item
android:bottom="50dp"
android:left="50dp"
android:right="50dp"
android:top="50dp">
<shape
android:shape="oval"
android:useLevel="false">
<solid android:color="#android:color/white" />
</shape>
</item>
</layer-list>
Note: The only changes made was in the sizes to accomodate your imageview of 150dp X 150dp. When using it for your radio button I highly reccomend using the 10x10dp sizes

Android switches - making thumb height larger than track height, how?

Is there any way to make the height of the thumb of a switch bigger than the track height in Android versions prior to Lollipop ?
I am essentially trying to create a material design-like switch widget in Kitkat (and older versions- the problem here is the thumb by default 'fits' inside the track). I have been working on this for quite some time now but I can't seem to arrive at the correct design.
I followed the solutions on this SO post: How to change the size of a Switch Widget.
Any suggestions or a solution would be most appreciated.

I added a transparent stroke to my track drawable shape which results in a padding around the track:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#color/track_color"/>
<size android:height="#dimen/track_height" />
<size android:width="#dimen/track_width" />
<!-- results in the track looking smaller than the thumb -->
<stroke
android:width="6dp"
android:color="#00ffffff"/>
</shape>

Yup
I solved this
<android.support.v7.widget.SwitchCompat
android:id="#+id/mySwitch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textOn="ON"
android:textOff="OFF"
style="#style/Color1SwitchStyle"
android:text="" />
This is My Color1SwitchStyle
<style name="Color1SwitchStyle">
<item name="android:thumb">#drawable/customswitchselector</item>
<item name="android:track">#drawable/my_custom_track</item>
//when use Switch in xml file
<item name="track">#drawable/my_custom_track</item>
//when use android.support.v7.widget.SwitchCompat in xml
</style>
*Hear is my customswitchselector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_checked="true"
android:drawable="#drawable/on" >
<shape
android:shape="rectangle"
android:dither="true"
android:useLevel="false"
android:visible="true">
<gradient
android:startColor="#66AAFF00"
android:endColor="#6600FF00"
android:angle="270"/>
<corners
android:radius="15dp"/>
<size
android:width="200dp"
android:height="80dp" />
<stroke
android:width="4dp"
android:color="#0000ffff"/>
</shape>
</item>
<item android:state_checked="false"
android:drawable="#drawable/off">
<shape
android:shape="rectangle"
android:dither="true"
android:useLevel="false"
android:visible="true">
<gradient
android:startColor="#66AAFF00"
android:endColor="#6600FF00"
android:angle="270"/>
<corners
android:radius="15dp"/>
<size
android:width="200dp"
android:height="80dp" />
<stroke
android:width="4dp"
android:color="#0000ffff"/>
</shape>
</item>
</selector>
And hear is magic my my_custom_track.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_checked="true"
android:state_enabled="true"
android:drawable="#drawable/switch_track_on" />
<item
android:state_checked="false"
android:state_enabled="false"
android:drawable="#drawable/switch_track_off" />
</selector>
switch_track_on.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:shape="rectangle"
android:dither="true"
android:useLevel="false"
android:visible="true">
<gradient
android:startColor="#color/profile_pic_bg"
android:endColor="#color/profile_pic_bg"
android:angle="270"/>
<corners
android:radius="0dp"/>
<size
android:width="100dp"
android:height="10dp" />
<stroke
android:width="12dp"
android:color="#00ffffff"/>
</shape>
</item>
</layer-list>
switch_track_off.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:shape="rectangle"
android:dither="true"
android:useLevel="false"
android:visible="true">
<gradient
android:startColor="#color/gray"
android:endColor="#color/gray"
android:angle="270"/>
<corners
android:radius="0dp"/>
<size
android:width="100dp"
android:height="10dp" />
<stroke
android:width="12dp"
android:color="#00ffffff"/>
</shape>
</item>
</layer-list>
Thanks stevenp without your comment i cannot solve this

Adding top and bottom inset in the 'track' drawable works for me. android:bottom="5dp" android:top="5dp"
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:bottom="5dp"
android:top="5dp">
<shape>
<corners android:radius="15dp" />
<solid android:color="#android:color/transparent" />
<stroke
android:width="2dp"
android:color="#EEEEEE" />
</shape>
</item>
<androidx.appcompat.widget.SwitchCompat
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:track="#drawable/switch_track_drawable" />

The solution I came up with is just to use for the track a shape that is a line instead of a rectangle, and set the width explicitly in its stroke.
For example if the switch is defined as follows:
<android.support.v7.widget.SwitchCompat
android:id="#+id/my_switch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:track="#drawable/switch_track"
app:theme="#android:style/Theme.DeviceDefault.Light" />
The in the switch_track.xml drawable use a line shape with whatever width you desire:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_checked="false" >
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="line" >
<stroke android:color="#50bbb9bf" android:width="5dp"/>
</shape>
</item>
<item android:state_checked="true">
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="line">
<stroke android:color="#5000b6de" android:width="5dp"/>
</shape>
</item>
</selector>

Shape with selector as color doesn't works

I want to create a shape with selector as solid color.
On Android 5.0+, this code works perfectly, but on 4.X, it doesn't works.
shape.xml :
<?xml version="1.0" encoding="utf-8"?>
<shape android:shape="rectangle" xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#color/my_selector"/>
<size android:height="40dp" android:width="40dp"/>
<corners android:radius="10dp" />
</shape>
my_selector.xml
<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:color="#color/color_1"
android:state_checked="false"/>
<item
android:color="#color/color_2"
android:state_checked="true"/>
</selector>
This drawable is applied to CheckBox background.

you should change order to write state like this and use your shape in item:
<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_checked="true">
<shape android:shape="rectangle" >
<solid android:color="#color/my_selector"/>
<size android:height="40dp" android:width="40dp"/>
<corners android:radius="10dp" />
</shape>
</item>
<item>
<shape android:shape="rectangle" >
<solid android:color="#color/my_deselec"/>
<size android:height="40dp" android:width="40dp"/>
<corners android:radius="10dp" />
</shape>
</item>
</selector>

Use in this manner
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" >
<shape>.......</shape>
</item>

How to apply shape and selector simultaneously for Button?

I have applied a shape for a button like:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<gradient android:startColor="#DD000000" android:endColor="#DD2d2d2d" android:angle="90"></gradient>
<corners android:radius="15dip"></corners>
</shape>
Now I want to use a selector like:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/active"
android:state_pressed="true" />
<item android:drawable="#drawable/passive"/>
for this Button as well. Is it possible ...???

use this way:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" >
<shape>.......</shape>
</item>
..........
..........
</selector>

Detailed to the point answer
Create a color resource in
res/values/colors.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<item name="yellow" type="color">#F7B500</item>
<item name="yellow_dark" type="color">#AC7E00</item>
<integer-array name="androidcolors">
<item>#color/yellow</item>
<item>#color/yellow_dark</item>
</integer-array>
</resources>
Create a drawable at
res/drawable/bg_yellow_round.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<solid android:color="#color/yellow" />
<stroke
android:width="2dp"
android:color="#color/yellow" />
<corners
android:bottomLeftRadius="20dp"
android:bottomRightRadius="20dp"
android:topLeftRadius="20dp"
android:topRightRadius="20dp" />
</shape>
Create another drawable, you want for transition at same place and name it
res/drawable/bg_yellow_dark_round.xml
<solid android:color="#color/yellow_dark" />
<stroke
android:width="2dp"
android:color="#color/yellow_dark" />
<corners
android:bottomLeftRadius="20dp"
android:bottomRightRadius="20dp"
android:topLeftRadius="20dp"
android:topRightRadius="20dp" />
Now create a color state list at
res/color/btn_selector_yellow.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" android:exitFadeDuration="#android:integer/config_shortAnimTime">
<item android:drawable="#color/yellow" android:state_focused="true" android:state_pressed="false"/>
<item android:drawable="#drawable/bg_yellow_dark_round" android:state_pressed="true"/>
<item android:drawable="#drawable/bg_yellow_round"/>
</selector>
Now set it to your button as following
<Button
android:id="#+id/button1"
android:layout_width="248dp"
android:layout_height="44dp"
android:layout_gravity="center_horizontal"
android:layout_marginBottom="10dp"
android:layout_marginTop="20dp"
android:background="#color/btn_selector_yellow"
android:text="AZ_ is so cool" />
Now this will do transition from
to
.

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>

You can also create a shape that is using a selector inside. If your shape is just changing its color in different states, this is a lot cleaner.
color/color_selector.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="#color/blue_dark" android:state_pressed="true" />
<item android:color="#color/blue_light" />
</selector>
drawable/shape.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#color/color_selector" />
<corners android:bottomLeftRadius="6dip" android:bottomRightRadius="6dp" />
<padding android:bottom="0dip" android:left="0dip" android:right="0dip" android:top="0dip" />
</shape>

Well I know it's way too late
But here is a solved example
<TextView
android:id="#+id/txt_out_going_calls"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="04dp"
android:layout_weight="1"
android:background="#drawable/header_text_view_selector"
android:gravity="center"
android:text="#string/outgoing_calls_tab_button_text"
android:textColor="#color/home_text_color" />
and my header_text_view_selector
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true">
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#color/home_fragment_tab_color_selected"/>
<corners android:radius="25dip" />
<padding android:bottom="08dip" android:left="9dip" android:right="9dip" android:top="08dip" />
</shape>
</item>
<item android:state_selected="false">
<shape>
<solid android:color="#color/home_fragment_tab_color_simple"/>
<corners android:radius="25dip" />
<padding android:bottom="08dip" android:left="9dip" android:right="9dip" android:top="08dip" />
</shape>
</item>
</selector>
So basically i m creating a rounded textview with selector. Here i m handling only state_selected and not_selected. Hope it helps

This is my way, and it works!
<item android:state_pressed="true">
<shape android:shape="oval">
<gradient android:centerX=".6"
android:centerY=".40"
android:endColor="#color/colorPrimary"
android:gradientRadius="20"
android:startColor="#color/colorPrimary"
android:type="radial" />
<stroke android:width="1dp"
android:color="#FFFFFF" />
<size android:width="55dp"
android:height="55dp" />
</shape>
</item>
<item android:state_focused="false">
<shape android:shape="oval">
<gradient android:centerX=".6"
android:centerY=".40"
android:endColor="#android:color/transparent"
android:gradientRadius="20"
android:startColor="#android:color/transparent"
android:type="radial" />
<stroke android:width="1dp"
android:color="#FFFFFF" />
<size android:width="55dp"
android:height="55dp" />
</shape>
</item>

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>

Use your shape name as you use any image and use it selector as you use image. Try out you will not face any problem. Is that what you were asking?

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.