<androidx.constraintlayout.widget.ConstraintLayout
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=".test">

<com.example.tictactoebot.Activities.SquareGridLayout
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:background="@color/black">

    <ImageView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@color/white"
        android:layout_row="0"
        android:layout_column="0"
        android:layout_rowWeight="1"
        android:layout_columnWeight="1"
        android:layout_margin="10dp"/>
    <ImageView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@color/white"
        android:layout_row="0"
        android:layout_column="1"
        android:layout_rowWeight="1"
        android:layout_columnWeight="1"
        android:layout_margin="10dp"/>
    <ImageView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@color/white"
        android:layout_row="0"
        android:layout_column="2"
        android:layout_rowWeight="1"
        android:layout_columnWeight="1"
        android:layout_margin="10dp"/>
    <ImageView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@color/white"
        android:layout_row="1"
        android:layout_column="0"
        android:layout_rowWeight="1"
        android:layout_columnWeight="1"
        android:layout_margin="10dp"/>
    <ImageView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@color/white"
        android:layout_row="1"
        android:layout_column="1"
        android:layout_rowWeight="1"
        android:layout_columnWeight="1"
        android:layout_margin="10dp"/>
    <ImageView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@color/white"
        android:layout_row="1"
        android:layout_column="2"
        android:layout_rowWeight="1"
        android:layout_columnWeight="1"
        android:layout_margin="10dp"/>
    <ImageView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@color/white"
        android:layout_row="2"
        android:layout_column="0"
        android:layout_rowWeight="1"
        android:layout_columnWeight="1"
        android:layout_margin="10dp"/>
    <ImageView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@color/white"
        android:layout_row="2"
        android:layout_column="1"
        android:layout_rowWeight="1"
        android:layout_columnWeight="1"
        android:layout_margin="10dp"/>
    <ImageView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@color/white"
        android:layout_row="2"
        android:layout_column="2"
        android:layout_rowWeight="1"
        android:layout_columnWeight="1"
        android:layout_margin="10dp"/>

</com.example.tictactoebot.Activities.SquareGridLayout>

private Square[][] board;
private static int boardSize = 3;
private SquareGridLayout grid;
private int squareMargin = 5;


public TicTacToeBoard() {
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_tic_tac_toe_board, container, false);

    FrameLayout frame = view.findViewById(R.id.tic_tac_toe_board);

    frame.setBackgroundColor(getResources().getColor(R.color.colorAccent));

    grid = new SquareGridLayout(getContext());
    grid.setLayoutParams(new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.MATCH_PARENT,
            0
    ));
    grid.setBackgroundColor(getResources().getColor(R.color.colorPrimaryDark));
    grid.setRowCount(boardSize);
    grid.setColumnCount(boardSize);

    frame.addView(grid);

    Square square;

    board = new Square[boardSize][boardSize];

    for(int x=0; x<boardSize; x++){
        for(int y=0; y<boardSize; y++){

            square = new Square(getContext());

            //Square definition
            square.setBackgroundColor(getResources().getColor(R.color.white));
            square.setEnabled(true);

            square.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    humanClickedButton((Square)v);
                }
            });

            //Grid location
            GridLayout.LayoutParams gridParams = new GridLayout.LayoutParams();

            gridParams.height = 0;
            gridParams.width = 0;

            gridParams.topMargin = squareMargin;
            gridParams.bottomMargin = squareMargin;
            gridParams.leftMargin = squareMargin;
            gridParams.rightMargin = squareMargin;

            if(x == 0){
                gridParams.topMargin = 0;
            }
            else if(x == boardSize-1){
                gridParams.bottomMargin = 0;
            }

            if (y == 0) {
                gridParams.leftMargin = 0;
            }
            else if(y == boardSize-1){
                gridParams.rightMargin = 0;
            }

            gridParams.rowSpec = GridLayout.spec(x, 1f);//Setting weight to 1
            gridParams.columnSpec = GridLayout.spec(y, 1f);//Setting weight to 1

            square.setLayoutParams(gridParams);


            //Store copy locally
            board[x][y] = square;


            grid.addView(square, (x*3+y));
        }
    }

    return view;
}

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Activities.Fragments.TicTacToeBoard"
    android:layout_margin="20dp"
    android:layout_gravity="center_vertical"
    android:id="@+id/tic_tac_toe_board">
</FrameLayout>