title: center only icons (not text also) horizontally and vertically on a button
body: <p>I have 3 buttons at the bottom of an app im creating, and I'm just trying to use some stock android icons instead of text or a combination of both. There is the <code>andoid:drawableStart / top / bottom / etc</code> commands but I just would like these icons to appear smack dab in the middle. There seems to be no easy solution for this? Here is what I am working with:</p>
  
  <pre><code>&lt;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:background="@drawable/calm"
      android:paddingBottom="@dimen/activity_vertical_margin"
      android:paddingLeft="@dimen/activity_horizontal_margin"
      android:paddingRight="@dimen/activity_horizontal_margin"
      android:paddingTop="@dimen/activity_vertical_margin"
      tools:context=".PiktuurMain" &gt;
  
      &lt;LinearLayout
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          android:layout_alignParentBottom="true"
          android:layout_centerHorizontal="true" &gt;
  
          &lt;Button
              android:id="@+id/takepic"
              android:layout_width="0dp"
              android:layout_height="wrap_content"
              android:layout_weight="1"
              android:background="@drawable/round" /&gt;
  
          &lt;Button
              android:id="@+id/editpic"
              android:layout_width="0dp"
              android:layout_height="wrap_content"
              android:layout_marginLeft="15dp"
              android:layout_marginRight="15dp"
              android:layout_weight="1"
              android:background="@drawable/round" /&gt;
  
          &lt;Button
              android:id="@+id/sharepic"
              android:layout_width="0dp"
              android:layout_height="wrap_content"
              android:layout_weight="1"
              android:background="@drawable/round"
              android:drawableStart="@android:drawable/ic_dialog_email" /&gt;
      &lt;/LinearLayout&gt;
  &lt;/RelativeLayout&gt;
  </code></pre>