android-calculatorpp/calculatorpp/res/layout/main_calculator.xml

<?xml version="1.0" encoding="utf-8"?>

<!--
  ~ Copyright (c) 2009-2011. Created by serso aka se.solovyev.
  ~ For more information, please, contact se.solovyev@gmail.com
  ~ or visit http://se.solovyev.org
  -->

<LinearLayout
        xmlns:a="http://schemas.android.com/apk/res/android"
        a:layout_width="match_parent"
        a:layout_height="match_parent"
        a:id="@+id/main_layout"
        a:orientation="vertical"
        a:layout_gravity="center"
        a:background="@color/default_background">

    <LinearLayout a:id="@+id/editorContainer"
                  a:layout_weight="2"
                  a:layout_width="match_parent"
                  a:layout_height="0dp"/>

    <LinearLayout a:layout_weight="1"
                  a:layout_width="match_parent"
                  a:layout_height="0dp">

        <include layout="@layout/calc_equals_button"
                 a:layout_weight="1"
                 a:layout_width="0dp"
                 a:layout_height="match_parent"/>

        <LinearLayout a:id="@+id/displayContainer"
                      a:layout_weight="4"
                      a:layout_width="0dp"
                      a:layout_height="match_parent"/>

    </LinearLayout>

    <LinearLayout a:id="@+id/keyboardContainer"
                  a:layout_weight="5"
                  a:layout_width="match_parent"
                  a:layout_height="0dp"/>

</LinearLayout>