ViewConfiguration.getScaledTouchSlop () 用法

getScaledTouchSlop是一個距離，表示滑動的時候，手的移動要大於這個距離纔開始移動控件。若是小於這個距離就不觸發移動控件，如viewpager就是用這個距離來判斷用戶是否翻頁

 

ViewConfiguration滑動參數設置類：

1. /**
2. * 包含了方法和標準的常量用來設置UI的超時、大小和距離
3. */
4. public class ViewConfiguration {
5. // 設定水平滾動條的寬度和垂直滾動條的高度，單位是像素px
6. private static final int SCROLL_BAR_SIZE = 10;
7.  
8. //定義滾動條逐漸消失的時間，單位是毫秒
9. private static final int SCROLL_BAR_FADE_DURATION = 250;
10.  
11. // 默認的滾動條多少秒以後消失，單位是毫秒
12. private static final int SCROLL_BAR_DEFAULT_DELAY = 300;
13.  
14. // 定義邊緣地方褪色的長度
15. private static final int FADING_EDGE_LENGTH = 12;
16.  
17. //定義子控件按下狀態的持續事件
18. private static final int PRESSED_STATE_DURATION = 125;
19.  
20. //定義一個按下狀態轉變成長按狀態的轉變時間
21. private static final int LONG_PRESS_TIMEOUT = 500;
22.  
23. //定義用戶在按住適當按鈕，彈出全局的對話框的持續時間
24. private static final int GLOBAL_ACTIONS_KEY_TIMEOUT = 500;
25.  
26. //定義一個touch事件中是點擊事件仍是一個滑動事件所需的時間，若是用戶在這個時間以內滑動，那麼就認爲是一個點擊事件
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. //定義一個touch事件時候是一個點擊事件。若是用戶在這個時間內沒有完成這個點擊，那麼就認爲是一個點擊事件
35. private static final int JUMP_TAP_TIMEOUT = 500;
36.  
37. //定義雙擊事件的間隔時間
38. private static final int DOUBLE_TAP_TIMEOUT = 300;
39.  
40. //定義一個縮放控制反饋到用戶界面的時間
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. //用來初始化fling的最小速度，單位是每秒多少像素
71. private static final int MINIMUM_FLING_VELOCITY = 50;
72.  
73. //用來初始化fling的最大速度，單位是每秒多少像素
74. private static final int MAXIMUM_FLING_VELOCITY = 4000;
75.  
76. //視圖繪圖緩存的最大尺寸，以字節表示。在ARGB888格式下，這個尺寸應至少等於屏幕的大小
77. @Deprecated
78. private static final int MAXIMUM_DRAWING_CACHE_SIZE = 320 * 480 * 4; // HVGA screen, ARGB8888
79.  
80. //flings和scrolls摩擦力度大小的係數
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. }