android - Need to center ImageButton src, not stretch it to match the button size -

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i learning develop android user interfaces. want create imagebutton set of drawables indicate different button states. created 2 pictures each button: 133 dp normal state , scaled copy (126 dp) create pushed button effect.

enter image description here

i painted second picture indicate image selector mechanism works @ least.

here initial state of application

enter image description here

when push button changes color not size expected. both images fitted same size

enter image description here

activity layout xml:

    <?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"     android:layout_height="match_parent" android:paddingleft="@dimen/activity_horizontal_margin"     android:paddingright="@dimen/activity_horizontal_margin"     android:paddingtop="@dimen/activity_vertical_margin"     android:paddingbottom="@dimen/activity_vertical_margin" tools:context=".mainuseractions"     android:background="@android:color/transparent">      <linearlayout         android:orientation="vertical"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:weightsum="3"         android:layout_alignparenttop="true">          <linearlayout             android:orientation="horizontal"             android:layout_width="match_parent"             android:layout_height="match_parent"             android:layout_weight="1"             android:weightsum="2"             android:gravity="top">              <imagebutton                 android:layout_width="match_parent"                 android:layout_height="match_parent"                 android:id="@+id/imagebutton"                 android:clickable="true"                 android:layout_weight="1"                 android:src="@drawable/broom_stick_image_selection"                 android:background="@null"                 android:layout_gravity="center"                 android:scaletype="center" />              <imagebutton                 android:layout_width="match_parent"                 android:layout_height="match_parent"                 android:id="@+id/imagebutton2"                 android:layout_gravity="center"                 android:clickable="true"                 android:layout_weight="1"                 android:background="@null"                 android:src="@drawable/vacuum_selection"                 android:scaletype="center" />         </linearlayout>          <linearlayout             android:orientation="horizontal"             android:layout_width="match_parent"             android:layout_height="match_parent"             android:layout_gravity="center_horizontal"             android:layout_weight="1"></linearlayout>          <linearlayout             android:orientation="horizontal"             android:layout_width="match_parent"             android:layout_height="match_parent"             android:layout_gravity="center_horizontal"             android:layout_weight="1"></linearlayout>     </linearlayout> </relativelayout>

drawable selection xml:

<?xml version="1.0" encoding="utf-8"?>  <selector xmlns:android="http://schemas.android.com/apk/res/android">      <item android:state_pressed="true"            android:drawable="@drawable/broom_stick_white_pressed_rose" /> <!-- pressed -->      <item android:state_focused="true"            android:drawable="@drawable/broom_stick_white" /> <!-- focused -->      <item android:drawable="@drawable/broom_stick_white" /> <!-- default -->  </selector>

how tell system center src images on button layout, not fit them same size?

one way accomplish wrap item in layer-list, allows definition of offsets.

<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android">     <item android:state_pressed="true">         <layer-list>             <item                 android:drawable="@drawable/broom_stick_white_pressed_rose"                 android:top="2dp"                 android:right="2dp"                 android:bottom="2dp"                 android:left="2dp" />         </layer-list>     </item>     <item android:drawable="@drawable/broom_stick_white" /> </selector>

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