[lb8] activity_main.xml (land)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <FrameLayout
        android:id="@+id/frame_left"
        android:layout_weight="2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
    <FrameLayout
        android:id="@+id/frame_right"
        android:layout_weight="1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</LinearLayout>