如何将视图动态添加到已在 xml 布局中声明的relativelayout？

我宣布了一个RelativeLayout在 xml 布局文件中。现在我想添加Views从代码到现有布局。我添加了一个Button通过代码动态地更改为现有布局，如下所示：

rLayout = (RelativeLayout)findViewById(R.id.rlayout); 
        LayoutParams lprams = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
        Button tv1 = new Button(this); 
        tv1.setText("Hello"); 
        tv1.setLayoutParams(lprams); 
        tv1.setId(1); 
        rLayout.addView(tv1); 

现在我需要添加另一个Button在已添加的右侧Button。我无法找到将新按钮添加到先前添加的按钮右侧的方法。

添加规则RelativeLayout.RIGHT_OF对于第二个添加的Button LayoutParams:

    // first Button
    RelativeLayout rLayout = (RelativeLayout) findViewById(R.id.rlayout);
    RelativeLayout.LayoutParams lprams = new RelativeLayout.LayoutParams(
            RelativeLayout.LayoutParams.WRAP_CONTENT,
            RelativeLayout.LayoutParams.WRAP_CONTENT);
    Button tv1 = new Button(this);
    tv1.setText("Hello");
    tv1.setLayoutParams(lprams);
    tv1.setId(1);
    rLayout.addView(tv1);

    // second Button
    RelativeLayout.LayoutParams newParams = new RelativeLayout.LayoutParams(
            RelativeLayout.LayoutParams.WRAP_CONTENT,
            RelativeLayout.LayoutParams.WRAP_CONTENT);
    Button tv2 = new Button(this);
    tv1.setText("Hello2");
    newParams.addRule(RelativeLayout.RIGHT_OF, 1);
    tv2.setLayoutParams(newParams);
    tv2.setId(2);
    rLayout.addView(tv2);