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);