android-calculatorpp/app-android/res/layout/widget_layout.xml

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

<LinearLayout xmlns:a="http://schemas.android.com/apk/res/android"
              a:layout_width="match_parent"
              a:layout_height="match_parent"
              a:orientation="vertical"
              style="@style/cpp_widget_main_layout_style">

    <include layout="@layout/widget_editor"
             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/widget_equals_button"
                 a:layout_margin="@dimen/cpp_button_margin"
                 a:layout_weight="1"
                 a:layout_width="0dp"
                 a:layout_height="match_parent"/>

        <include layout="@layout/widget_display"
                      a:layout_weight="5"
                      a:layout_width="0dp"
                      a:layout_height="wrap_content"/>

    </LinearLayout>

    <include layout="@layout/widget_keyboard"
             a:layout_weight="5"
             a:layout_width="match_parent"
             a:layout_height="0dp"/>

</LinearLayout>