RelativeLayout.LayoutParams 使用addRule失效的问题解决办法

Button btn1;

btn1.setId(1001);

int width;   // layout width;

int btnWidth; // btn width;

int btnHeight; // btn height;

…….

RelativeLayout.LayoutParams p = new RelativeLayout.LayoutParams(btnWidth, btnHeight);

        p.addRule(RelativeLayout.ALIGN_PARENT_TOP);

p.addRule(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.TRUE);

p.topMargin = config.topMargin;

// 这里必须设置,否则依赖这个左右对齐的控件无法对齐。

//   如果不设置,只使用水平居中的属性,则1001这个控件的leftmargin为0. 导致左右对齐失败

p.leftMargin = (width-btnWidth)/2; 

//

Button btn2;

RelativeLayout.LayoutParams p = new RelativeLayout.LayoutParams(btnWidth, btnHeight);

        p.addRule(RelativeLayout.ALIGN_PARENT_TOP);

p.addRule(RelativeLayout.ALIGN_LEFT, 1001); // 这里要想生效必须,1001这个控件必须添加leftmargin.

 p.topMargin = config.topMargin;

//

Button btn3;

RelativeLayout.LayoutParams p = new RelativeLayout.LayoutParams(btnWidth, btnHeight);

        p.addRule(RelativeLayout.ALIGN_PARENT_TOP);

// 这里要想生效必须,1001这个控件必须添加leftmargin/ right margin.

p.addRule(RelativeLayout.ALIGN_RIGHT, 1001); 

 p.topMargin = config.topMargin;

原文地址:https://www.cnblogs.com/feitianlee/p/3944800.html