为第二个添加的ButtonLayoutParams添加规则RelativeLayout.RIGHT_OF:

Add the rule RelativeLayout.RIGHT_OF for the second added 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);