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

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

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

    <include
        layout="@layout/widget_editor"
        a:layout_width="match_parent"
        a:layout_height="0dp"
        a:layout_weight="2" />

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

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

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

    </LinearLayout>

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

</LinearLayout>