How can I stretch the image in imagebutton to the whole area of the imagebutton?

Question

Here is a picture that will help you understand my problem:

I want to stretch

Answer 1

You should consider creating a 9-patch image to make the image fit correctly on an ImageButton in case you need to stretch it, but you don't want the image to become distorted.

To have a button with an image that completely covers it, you can use something like this:

<ImageButton android:id="@+id/iconBtn"
  android:layout_width="64dip"
  android:layout_height="64dip"
  android:src="@drawable/icon_button"
  android:scaleType="fitCenter"
  android:background="#00000000"/>

For a full tutorial on creating buttons with custom skins and the use of selectors to manage their states, you can check a tutorial I've written some time ago here (Creating a custom Android button with a resizable skin).