Why doesn't my state-list-drawable applied to an ImageView use the drawable for pressed-state when I touch the ImageView?

I have my ImageView defined in XML like this:

<ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/fragment_imageView"
        android:src="@drawable/ic_photo"
        android:background="@drawable/button_state_list_drawable" />

The button_state_list_drawable.xml is:

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

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

    <item android:drawable="@drawable/button_enabled_state_drawable"
        android:state_enabled="true" />

</selector>

The button_pressed_state_drawable.xml is:

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

    <size android:width="50dp"
        android:height="50dp" />

    <padding android:left="25dp"
        android:right="25dp"
        android:top="25dp"
        android:bottom="25dp" />

    <stroke android:color="#fff"
        android:width="1dp" />

    <solid android:color="#1aafd0" />

</shape>

The button_enabled_state_drawable.xml is:

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

    <size android:width="50dp"
        android:height="50dp" />

    <padding android:left="25dp"
        android:right="25dp"
        android:top="25dp"
        android:bottom="25dp" />

    <stroke android:color="#fff"
        android:width="1dp" />

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

</shape>

The problem is that when I click/touch the ImageView, the button_pressed_state_drawable does not seem to be used, i.e. I can't see the <solid android:color="#1aafd0" /> in action (which is basically the only difference between the two drawables), i.e the background color is still transparent instead of changing to blue. Where am I messing up?

I think your ImageView is not clickable.

Try to make it clickable by using ImageView.setClicked(true).

or

        android:clickable="true"
        android:focusable="true"

Also make sure that your image resource is not covered your background.

This is what i've done which works fine.

    <ImageView
        android:id="@+id/fragment_imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/button_state_list_drawable"
        android:clickable="true"
        android:focusable="true"
        android:padding="20dp"
        android:src="@drawable/ic_launcher"/>