Layout File in Sudoku

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.vikesh.gamesudoku.MainActivity">

     <Chronometer
        android:id="@+id/chronometer1"
        android:textColor="#4169E1"
        android:textSize="20dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:text="Chronometer" />
   
    <com.vikesh.gamesudoku.view.sudokugrid.SudokuGridView
        android:id="@+id/sudokuGridView"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_below="@+id/chronometer1"
        android:numColumns="9"
        android:horizontalSpacing="0dp"
        android:verticalSpacing="0dp" />
    <com.vikesh.gamesudoku.view.buttonsgrid.ButtonsGridView
        android:id="@+id/buttonsGridView"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_below="@+id/sudokuGridView"
        android:numColumns="6" />
       
</RelativeLayout>