android 使用代码实现 RelativeLayout布局

只需把代码copy进入oncreate方法即可运行

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

代码参考自:

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