how to replace/change image button programmatically android

I have an image button on my view which i need to change after user interaction. I dont find nothing like myImageButton.setDrawable Here is my xml for the button i want to change:

<ImageButton
        android:id="@+id/stopButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/buttons_background"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="5dp"
        android:background="@null"
        android:src="@drawable/btn_play" />

The only line I need to change android:src="@drawable/btn_play" to android:src="@drawable/btn_stop" programmatically. Can this be done? Thanks in advance.