android - Does changing the background also change the padding of a LinearLayout?

Question

I have the following LinearLayout. What I don't understand is if I set the background to another image, the padding information are reset. Is there a way to prevent this?

<LinearLayout android:id="@+id/aPanel"
    android:orientation="horizontal" android:layout_width="fill_parent"
    android:layout_height="wrap_content" android:background="@drawable/bkground"
    android:paddingLeft="15dp" android:paddingRight="15dp"> 

     <!-- some children here -->
     </LinearLayout>

I see the position of the children get shifted when I change the background drawable of the LinearLayout aPanel.

Answer 1

This is the default behavior when changing the background Drawable on a View. According to Romain Guy, one of the Android developers, "The reason why setting an image resets the padding is because 9-patch images can encode padding." See his full answer in a similar question.

The fix is to reset the padding in code each time you change the background drawable.