android - Different behaviour from button images -

following previous question, fitting 3 buttons , background image in android, have wanted, there minor issue don't understand. there 3 buttons,each button image, 3 images have same size, shown differently. image 2 starts @ left border, images 1 , 3 have margin @ left side.

from xml file, don't see reason that:

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="vertical"     android:weightsum="4"     >      <imageview         android:id="@+id/imageview01"         android:layout_width="match_parent"         android:layout_height="5dp"         android:layout_weight="0.5"         android:scaletype="fitxy"         android:src="@drawable/sector1" />      <button         android:id="@+id/button1"         android:layout_width="fill_parent"         android:layout_height="0dp"         android:layout_weight="1"         android:drawableleft="@drawable/agenda_izq"         android:maxlines="1"         android:text="agenda" />      <button         android:id="@+id/button2"         android:layout_width="fill_parent"         android:layout_height="0dp"         android:layout_weight="1"         android:background="@color/fondo"         android:drawableleft="@drawable/actividades_izq"         android:maxlines="1"         android:text="actividades" />      <button         android:id="@+id/button3"         android:layout_width="fill_parent"         android:layout_height="0dp"         android:layout_weight="1"         android:drawableleft="@drawable/suscribete_izq"         android:gravity="left|center_vertical|center_horizontal"         android:maxlines="2"         android:text="recibir información de juventud" />      <imageview         android:id="@+id/imageview1"         android:layout_width="match_parent"         android:layout_height="5dp"         android:layout_weight="0.5"         android:scaletype="fitxy"         android:src="@drawable/sector3" />  </linearlayout> 

i 3 images start left border, without margin.

thank you.

your second image linked left no margin because line:

android:background="@color/fondo"