Q:

Round corner button: Where am I wrong

I want to create round corner button. This is what I tried:
I have defined the button's background drawable button_bg.xml :
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:state_enabled="false"
        android:drawable="@color/grey">

        <shape>
          <solid
              android:color="#ef4444" />
          <stroke
              android:width="1dp"
              android:color="#992f2f" />
          <corners
              android:radius="16dp" />
        </shape>
    </item>

    <item
        android:state_pressed="true"
        android:state_enabled="true"
        android:drawable="@color/dark_grey"
    >
        <shape>
          <solid
              android:color="#ef4444" />
          <stroke
              android:width="1dp"
              android:color="#992f2f" />
          <corners
              android:radius="16dp" />
        </shape>
    </item>

    <item
        android:state_enabled="true"
        android:drawable="@color/blue"
    >
        <shape>
          <solid
              android:color="#ef4444" />
          <stroke
              android:width="1dp"
              android:color="#992f2f" />
          <corners
              android:radius="16dp" />
        </shape>

    </item>
</selector>

Then, I apply it to my button in layout file:
<Button
      android:text="@string/press_me"
      android:layout_margin="12dp"
      android:layout_width="fill_parent"
      android:layout_height="30dp"

      android:background="@drawable/button_bg"
/>

But my button is still showing sharp corner instead of the round one, why?? 
(Please don't just throw me a link about how to make round corner, my above code followed those tutorials, I just want to know where am I wrong. Thanks)

A:

remove android:drawable from the item node have it like this.
 <item  android:state_pressed="true"
        android:state_enabled="true">

EDIT :  (How can I specify the color from colors.xml for item then?) 
Create a stateful color drawable for your button text color.
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="true" android:state_pressed="false" android:color="#ffffff" />
    <item android:state_focused="true" android:state_pressed="true" android:color="#000000" />
    <item android:state_focused="false" android:state_pressed="true" android:color="#000000" />
    <item android:color="#ffffff" />
</selector>

and then set this as your text color for your button .
android:textColor="@drawable/button_text_color"

