protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        Button bt1 = new Button(this);
        bt1.setText("1");
        Button bt2 = new Button(this);
        bt2.setText("2");
        Button bt3 = new Button(this);
        bt3.setText("3");
        Button bt4 = new Button(this);
        bt4.setText("4");
        Button bt5 = new Button(this);
        bt5.setText("5");
        Button bt6 = new Button(this);
        bt6.setText("6");
        Button bt7 = new Button(this);
        bt7.setText("7");
        Button bt8 = new Button(this);
        bt8.setText("8");
        Button bt9 = new Button(this);
        bt9.setText("9");
        Button bt0 = new Button(this);
        bt0.setText("0");
        //bt0.setLayoutParams(params);

//      GridLayout gl = new GridLayout(this);
//      gl.setOrientation(GridLayout.VERTICAL);
        GridLayout gl = new GridLayout(this);
        gl.setOrientation(GridLayout.HORIZONTAL);
        gl.setColumnCount(3);
        gl.setRowCount(4);

        gl.addView(bt1);
        gl.addView(bt2);
        gl.addView(bt3);

        gl.addView(bt4);
        gl.addView(bt5);
        gl.addView(bt6);

        gl.addView(bt7);
        gl.addView(bt8);
        gl.addView(bt9);

        gl.addView(bt0);


        setContentView(gl);



    }