Center-align horizontally UI items

Question

I'm attempting to create my first Android app and I'd like to horizontally align the items on screen and in rows.

I've tried setting the layout_gravity to center_horizontal as shown below however that doesn't appear to do anything. What am I missing?

Code:

<?xml version="1.0" encoding="utf-8"?>
<android.support.wear.widget.BoxInsetLayout 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"
    android:padding="@dimen/box_inset_layout_padding"
    tools:deviceIds="wear">
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:padding="@dimen/inner_frame_layout_padding"
        app:boxedEdges="all"
        android:minWidth="25px"
        android:minHeight="25px">
        <GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent"    
                android:rowCount="8"
                android:layout_gravity="center_horizontal"
                android:columnCount="1"
                android:orientation="horizontal">
            <TextView
                android:id="@+id/text"
                android:visibility="visible"
                android:textSize="9dp"
                android:layout_row="1"/>
            <TextView
                android:id="@+id/text2"
                android:visibility="visible"
                android:text="@string/hello_world"
                android:textAlignment="center"
                android:textSize="9dp"
                android:layout_row="2"/>
            <TextView
                android:id="@+id/serviceScore"
                android:layout_row="4"
                android:visibility="visible"
                android:textAlignment="center"
                android:textSize="50dp"/>
        </GridLayout>
    </FrameLayout>
</android.support.wear.widget.BoxInsetLayout>

UI:

Answer 1

Greet by Nice! Just add Gravity of layout center instead of center_horizontal of GridLayout.

android:layout_gravity="center"