uu-android/app_modular/appbooking/src/main/res/layout/activity_grid_select.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <GridView
        android:id="@+id/gv_topic"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/white"
        android:horizontalSpacing="15dp"
        android:numColumns="2"
        android:paddingLeft="15dp"
        android:paddingRight="15dp"
        android:paddingTop="5dp"
        android:scrollbars="none"
        android:verticalSpacing="10dp" />
</RelativeLayout>