Android Button 原理

核心提示：20. ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 0 1 1 1 121. PRESSED_STATE_SET, // 1 0 0 0 022. PRESSED_WINDOW_FOCUSED_STATE_SET, // 1 0 0 0 123. PRES

20. ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 0 1 1 1 1

21. PRESSED_STATE_SET, // 1 0 0 0 0

22. PRESSED_WINDOW_FOCUSED_STATE_SET, // 1 0 0 0 1

23. PRESSED_SELECTED_STATE_SET, // 1 0 0 1 0

24. PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 1 0 0 1 1

25. PRESSED_FOCUSED_STATE_SET, // 1 0 1 0 0

26. PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET, // 1 0 1 0 1

27. PRESSED_FOCUSED_SELECTED_STATE_SET, // 1 0 1 1 0

28. PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 1 0 1 1 1

29. PRESSED_ENABLED_STATE_SET, // 1 1 0 0 0

30. PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET, // 1 1 0 0 1

31. PRESSED_ENABLED_SELECTED_STATE_SET, // 1 1 0 1 0

32. PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 1 1 0 1 1

33. PRESSED_ENABLED_FOCUSED_STATE_SET, // 1 1 1 0 0

34. PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET, // 1 1 1 0 1

35. PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET, // 1 1 1 1 0

36. PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 1 1 1 1 1

37. };

设置background的代码：

1. /**

2. * Set the background to a given Drawable, or remove the background. If the

3. * background has padding, this View's padding is set to the background's

4. * padding. However, when a background is removed, this View's padding isn't

5. * touched. If setting the padding is desired, please use

6. * {@link #setPadding(int, int, int, int)}.

7. *

8. * @param d The Drawable to use as the background, or null to remove the

9. * background

10. */

11. public void setBackgroundDrawable(Drawable d) {

12.

13. ...

14.

15. if (d.isStateful()) {

16. d.setState(getDrawableState());