Button state_pressed="true" never triggered, why? - android-layout

Question

I have the following button defined in an activity layout:
<Button
android:id="#+id/button_Collect"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_marginBottom="16dp"
android:layout_gravity="center_horizontal"
android:background="#drawable/selector_CollectButton" />
With it I have this selector applied to the button:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<!-- PRESSED STATE (Opacity change to 75) -->
<!-- ==================================== -->
<layer-list>
<!-- Shape for the outer circle -->
<item opacity="75">
<shape android:shape="oval">
<solid android:color="#FFBDC3C7" />
</shape>
</item>
<!-- Shape for the circle -->
<item android:top="18dp" android:left="18dp" android:right="18dp" android:bottom="18dp">
<shape android:shape="oval">
<!--<solid android:color="#FF3498DB" />-->
<solid android:color="#FF22DD44" />
</shape>
</item>
</layer-list>
</item>
<item>
<!-- NORMAL STATE -->
<!-- ============ -->
<layer-list>
<!-- Shape for the outer circle -->
<item>
<shape android:shape="oval">
<solid android:color="#FFBDC3C7" />
</shape>
</item>
<!-- Shape for the circle -->
<item android:top="18dp" android:left="18dp" android:right="18dp" android:bottom="18dp">
<shape android:shape="oval">
<solid android:color="#FF3498DB" />
</shape>
</item>
</layer-list>
</item>
</selector>
Why is it that the pressed state never tiggers whenever I touch the button in my app?
I also tried splitting my "states" into separate xml drawable files, but the problem still remained.
As for the event, I have the following in my activity:
Button btnCollect = FindViewById<Button>(Resource.Id.button_Collect);
btnCollect.Touch += btnCollect_Touch;
This is C# code since I'm working with Xamarin. This code executes without a problem, so I know the touch event is executing.
UPDATE:
I figured something out, it works ONLY if I remove the above event handler:
I have the following code:
private void btnCollect_Touch(object sender, View.TouchEventArgs e)
{
if (e.Event.Action == MotionEventActions.Up)
ScoreManager.Instance.CalculatePoints();
}
If I don't add a handler to this method the selector works fine, anyone know why ???

Answer 1

Fixed!!
I changed the event from Touch to Click for the button and everything works fine now.
Also to note, many people have said (in other posts) that a Selector with Layer-Lists should be split into separate files. This crowds the project with a lot of xml files. IT IS NOT NECESSARY, you can have the states within the same selector file and it works perfectly fine.

Answer 2

Try this tutorial, this work for me
http://www.stealthcopter.com/blog/2010/08/making-prettier-buttons-in-android-xml-rolloverselection-focus-effects-9patch-images-and-transparency/