ViewConfiguration.getScaledTouchSlop () 用法

getScaledTouchSlop是一个距离，表示滑动的时候，手的移动要大于这个距离才开始移动控件。若是小于这个距离就不触发移动控件，如viewpager就是用这个距离来判断用户是否翻页

 

ViewConfiguration滑动参数设置类：

1. /**
2. * 包含了方法和标准的常量用来设置UI的超时、大小和距离
3. */
4. public class ViewConfiguration {
5. // 设定水平滚动条的宽度和垂直滚动条的高度，单位是像素px
6. private static final int SCROLL_BAR_SIZE = 10;
7.  
8. //定义滚动条逐渐消失的时间，单位是毫秒
9. private static final int SCROLL_BAR_FADE_DURATION = 250;
10.  
11. // 默认的滚动条多少秒以后消失，单位是毫秒
12. private static final int SCROLL_BAR_DEFAULT_DELAY = 300;
13.  
14. // 定义边缘地方褪色的长度
15. private static final int FADING_EDGE_LENGTH = 12;
16.  
17. //定义子控件按下状态的持续事件
18. private static final int PRESSED_STATE_DURATION = 125;
19.  
20. //定义一个按下状态转变成长按状态的转变时间
21. private static final int LONG_PRESS_TIMEOUT = 500;
22.  
23. //定义用户在按住适当按钮，弹出全局的对话框的持续时间
24. private static final int GLOBAL_ACTIONS_KEY_TIMEOUT = 500;
25.  
26. //定义一个touch事件中是点击事件仍是一个滑动事件所需的时间，若是用户在这个时间以内滑动，那么就认为是一个点击事件
27. private static final int TAP_TIMEOUT = 115;
28.  
29. /**
30. * Defines the duration in milliseconds we will wait to see if a touch event
31. * is a jump tap. If the user does not complete the jump tap within this interval, it is
32. * considered to be a tap.
33. */
34. //定义一个touch事件时候是一个点击事件。若是用户在这个时间内没有完成这个点击，那么就认为是一个点击事件
35. private static final int JUMP_TAP_TIMEOUT = 500;
36.  
37. //定义双击事件的间隔时间
38. private static final int DOUBLE_TAP_TIMEOUT = 300;
39.  
40. //定义一个缩放控制反馈到用户界面的时间
41. private static final int ZOOM_CONTROLS_TIMEOUT = 3000;
42.  
43. /**
44. * Inset in pixels to look for touchable content when the user touches the edge of the screen
45. */
46. private static final int EDGE_SLOP = 12;
47.  
48. /**
49. * Distance a touch can wander before we think the user is scrolling in pixels
50. */
51. private static final int TOUCH_SLOP = 16;
52.  
53. /**
54. * Distance a touch can wander before we think the user is attempting a paged scroll
55. * (in dips)
56. */
57. private static final int PAGING_TOUCH_SLOP = TOUCH_SLOP * 2;
58.  
59. /**
60. * Distance between the first touch and second touch to still be considered a double tap
61. */
62. private static final int DOUBLE_TAP_SLOP = 100;
63.  
64. /**
65. * Distance a touch needs to be outside of a window's bounds for it to
66. * count as outside for purposes of dismissing the window.
67. */
68. private static final int WINDOW_TOUCH_SLOP = 16;
69.  
70. //用来初始化fling的最小速度，单位是每秒多少像素
71. private static final int MINIMUM_FLING_VELOCITY = 50;
72.  
73. //用来初始化fling的最大速度，单位是每秒多少像素
74. private static final int MAXIMUM_FLING_VELOCITY = 4000;
75.  
76. //视图绘图缓存的最大尺寸，以字节表示。在ARGB888格式下，这个尺寸应至少等于屏幕的大小
77. @Deprecated
78. private static final int MAXIMUM_DRAWING_CACHE_SIZE = 320 * 480 * 4; // HVGA screen, ARGB8888
79.  
80. //flings和scrolls摩擦力度大小的系数
81. private static float SCROLL_FRICTION = 0.015f;
82.  
83. /**
84. * Max distance to over scroll for edge effects
85. */
86. private static final int OVERSCROLL_DISTANCE = 0;
87.  
88. /**
89. * Max distance to over fling for edge effects
90. */
91. private static final int OVERFLING_DISTANCE = 4;
92.  
93. }