Android uses code to implement RelativeLayout Layout

You only need to copy the code to the oncreate method to run it.

Java code

1. RelativeLayout rl = new RelativeLayout (this );
3. Button btn1 = new Button (this );
4. Btn1.setText ("----------------------");
5. Btn1.setId (1 );
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 is located at the top of the parent View and horizontally centered in the parent View
11. Rl. addView (btn1, lp1 );
13. Button btn2 = new Button (this );
14. Btn2.setText ("| \ n | ");
15. Btn2.setId (2 );
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 is located below btn1 and alignment to the left of btn1
21. Rl. addView (btn2, lp2 );
23. Button btn3 = new Button (this );
24. Btn3.setText ("| \ n | ");
25. Btn3.setId (3 );
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 is located at the bottom of btn1, right of btn2, and right of btn3 is aligned with the right of btn1 (to be expanded)
32. Rl. addView (btn3, lp3 );
34. Button btn4 = new Button (this );
35. Btn4.setText ("--------------------------------------------");
36. Btn4.setId (4 );
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 is located below btn2 and horizontally centered in the parent Veiw
42. Rl. addView (btn4, lp4 );
45. SetContentView (rl );