Android GridView: two colulmns of equal width and height centred in the parent - android-layout

Question

How can such a simple requirement be so impossible?
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="3">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:layout_weight="1"
android:orientation="vertical">
<GridLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="18dp"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_weight="1"
android:paddingLeft="12dp"
android:background="#drawable/box_background"
android:columnCount="2"
>
<TextView
android:layout_gravity="center"
android:padding="4dp"
android:text="text"
android:textSize="24dp"
/>
<TextView
android:layout_gravity="center"
android:padding="4dp"
android:text="text"
android:textSize="24dp"
/>
<TextView
android:layout_gravity="center"
android:padding="4dp"
android:text="text"
android:textSize="24dp"
/>
<TextView
android:layout_gravity="center"
android:padding="4dp"
android:text="text"
android:textSize="24dp"
/>
<TextView
android:layout_gravity="center"
android:padding="4dp"
android:text="text"
android:textSize="24dp"
/>
<TextView
android:layout_gravity="center"
android:padding="4dp"
android:text="text"
android:textSize="24dp"
/>
</GridLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:background="#fff"
android:paddingLeft="6dp"
android:paddingRight="6dp"
android:text="Box title" />
</RelativeLayout>
</LinearLayout>
Produces this rubbish:
WTF is the gap above the third row?
Is it possible -- I swear it isn't -- to get two centred columns with the rows evenly spaced?

Answer 1

Use this add android:layout_columnWeight="1" to gridlayout childrens
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="3">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:layout_weight="1"
android:orientation="vertical">
<GridLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/grid_layout"
android:columnCount="2"
android:layout_below="#id/title"
android:orientation="horizontal"
android:useDefaultMargins="true"
android:alignmentMode="alignBounds"
>
<TextView
android:layout_gravity="center_horizontal"
android:padding="4dp"
android:gravity="center"
android:text="text"
android:layout_columnWeight="1"
android:textSize="20sp"
/>
<TextView
android:layout_gravity="center_horizontal"
android:padding="4dp"
android:gravity="center"
android:text="text"
android:layout_columnWeight="1"
android:textSize="20sp"
/>
<TextView
android:layout_gravity="center_horizontal"
android:padding="4dp"
android:gravity="center"
android:text="text"
android:layout_columnWeight="1"
android:textSize="20sp"
/>
<TextView
android:layout_gravity="center_horizontal"
android:padding="4dp"
android:gravity="center"
android:text="text"
android:layout_columnWeight="1"
android:textSize="20sp"
/>
<TextView
android:layout_gravity="center_horizontal"
android:padding="4dp"
android:gravity="center"
android:text="text"
android:layout_columnWeight="1"
android:textSize="20sp"
/>
<TextView
android:layout_gravity="center_horizontal"
android:padding="4dp"
android:gravity="center"
android:text="text"
android:layout_columnWeight="1"
android:textSize="20sp"
/>
</GridLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:background="#fff"
android:paddingLeft="6dp"
android:id="#+id/title"
android:textSize="16sp"
android:paddingRight="6dp"
android:text="Box title" />
</RelativeLayout>
</LinearLayout>
</LinearLayout>
Output :