更改GridLayout Android Java中按钮的行（位置）

如何在GridLayout中交换btn3和btn的位置

    final Button btn = new Button(this);
    final Button btn2 = new Button(this);
    final Button btn3 = new Button(this);
    btn.setText("2");
    btn2.setText("4");
    btn3.setText("2");
    final GridLayout gl = (GridLayout) this.findViewById(R.id.gridLayout);
    gl.addView(btn);
    gl.addView(btn2);
    gl.addView(btn3);

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只需交换添加按钮的顺序即可

gl.addView(btn3);
gl.addView(btn2);
gl.addView(btn);