android 使用代码实现 RelativeLayout布局

来自：http://kukuqiu.iteye.com/blog/1018396

只需把代码copy进入oncreate方法即可运行 

Java代码  

1. RelativeLayout rl = new RelativeLayout(this);  
2.          
3.        Button btn1 = new Button(this);  
4.        btn1.setText("----------------------");  
5.        btn1.setId(1);  
6.          
7.        RelativeLayout.LayoutParams lp1 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);  
8.        lp1.addRule(RelativeLayout.ALIGN_PARENT_TOP);  
9.        lp1.addRule(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.TRUE);  
10.        // btn1 位于父 View 的顶部，在父 View 中水平居中  
11.        rl.addView(btn1, lp1 );  
12.         
13.        Button btn2 = new Button(this);  
14.        btn2.setText("|\n|\n|\n|\n|\n|");  
15.        btn2.setId(2);  
16.         
17.        RelativeLayout.LayoutParams lp2 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);  
18.        lp2.addRule(RelativeLayout.BELOW, 1);  
19.        lp2.addRule(RelativeLayout.ALIGN_LEFT, 1);  
20.        // btn2 位于 btn1 的下方、其左边和 btn1 的左边对齐  
21.        rl.addView(btn2, lp2);  
22.         
23.        Button btn3 = new Button(this);  
24.        btn3.setText("|\n|\n|\n|\n|\n|");  
25.        btn3.setId(3);  
26.         
27.        RelativeLayout.LayoutParams lp3 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);  
28.       lp3.addRule(RelativeLayout.BELOW, 1);  
29.        lp3.addRule(RelativeLayout.RIGHT_OF, 2);  
30.        lp3.addRule(RelativeLayout.ALIGN_RIGHT, 1);  
31.        // btn3 位于 btn1 的下方、btn2 的右方且其右边和 btn1 的右边对齐（要扩充）  
32.        rl.addView(btn3,lp3);  
33.         
34.        Button btn4 = new Button(this);  
35.        btn4.setText("--------------------------------------------");  
36.        btn4.setId(4);  
37.         
38.        RelativeLayout.LayoutParams lp4 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);  
39.        lp4.addRule(RelativeLayout.BELOW, 2);  
40.        lp4.addRule(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.TRUE);  
41.        // btn4 位于 btn2 的下方，在父 Veiw 中水平居中  
42.        rl.addView(btn4,lp4);  
43.         
44.         
45.        setContentView(rl);  

代码参考自: 
http://hi.baidu.com/xiechengfa/blog/item/5a3570eb3afb1a31b90e2d54.html, 有改动