v7/gridlayout/tests/res/layout/use_default_margin_test.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2015 The Android Open Source Project
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~      http://www.apache.org/licenses/LICENSE-2.0
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  ~ distributed under the License is distributed on an "AS IS" BASIS,
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<android.support.v7.widget.GridLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/gridView"
        android:background="@android:color/white"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        app:useDefaultMargins="true"
        app:columnCount="2"
        app:rowCount="1"
        app:orientation="horizontal">

    <TextView
            android:id="@+id/leftView"
            android:layout_width="0dp"
            app:layout_gravity="fill_horizontal"
            android:background="@color/red"
            app:layout_columnWeight="2"
            android:maxLines="3"
            android:text="column 1, with weight of 2"/>

    <TextView
            android:id="@+id/rightView"
            android:layout_width="0dp"
            app:layout_gravity="fill_horizontal"
            android:background="@color/blue"
            app:layout_columnWeight="1"
            android:minLines="3"
            android:text="column 2, with weight of 1"/>
</android.support.v7.widget.GridLayout>