Android Working with Support GridLayout

build.gradle

compile 'com.android.support:gridlayout-v7:25.3.1'

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="ir.mhdr.a084.MainActivity">


    <android.support.v7.widget.GridLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Left"
            app:layout_column="0"
            app:layout_columnWeight="1"
            app:layout_row="0" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Center"
            app:layout_column="1"
            app:layout_columnWeight="1"
            app:layout_row="0" />


        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Right"
            app:layout_column="2"
            app:layout_gravity="fill_vertical"
            app:layout_row="0"
            app:layout_rowSpan="2"
            app:layout_columnWeight="1"/>


        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Bottom"
            app:layout_column="0"
            app:layout_columnSpan="2"
            app:layout_columnWeight="1"
            app:layout_gravity="fill_horizontal"
            app:layout_row="1" />
    </android.support.v7.widget.GridLayout>
</RelativeLayout>

References
https://github.com/mhdr/AndroidSamples/tree/master/084
https://developer.android.com/reference/android/widget/GridLayout.html
https://www.youtube.com/watch?v=4bXOr5Rk1dk
http://stackoverflow.com/questions/10016343/gridlayout-not-gridview-how-to-stretch-all-children-evenly