getScaledTouchSlop是一個(gè)距離，表示滑動(dòng)的時(shí)候，手的移動(dòng)要大于這個(gè)距離才開(kāi)始移動(dòng)控件。如果小于這個(gè)距離就不觸發(fā)移動(dòng)控件，如viewpager就是用這個(gè)距離來(lái)判斷用戶是否翻頁(yè)。

ViewConfiguration滑動(dòng)參數(shù)設(shè)置類：

/**    
  * 包含了方法和標(biāo)準(zhǔn)的常量用來(lái)設(shè)置UI的超時(shí)、大小和距離    
  */ 
 public class ViewConfiguration {     
     // 設(shè)定水平滾動(dòng)條的寬度和垂直滾動(dòng)條的高度，單位是像素px     
     private static final int SCROLL_BAR_SIZE = 10;     
          
     //定義滾動(dòng)條逐漸消失的時(shí)間，單位是毫秒     
     private static final int SCROLL_BAR_FADE_DURATION = 250;     
          
     // 默認(rèn)的滾動(dòng)條多少秒之后消失，單位是毫秒     
     private static final int SCROLL_BAR_DEFAULT_DELAY = 300;     
          
     // 定義邊緣地方褪色的長(zhǎng)度     
     private static final int FADING_EDGE_LENGTH = 12;     
          
     //定義子控件按下?tīng)顟B(tài)的持續(xù)事件     
     private static final int PRESSED_STATE_DURATION = 125;     
              
     //定義一個(gè)按下?tīng)顟B(tài)轉(zhuǎn)變成長(zhǎng)按狀態(tài)的轉(zhuǎn)變時(shí)間     
     private static final int LONG_PRESS_TIMEOUT = 500;     
              
     //定義用戶在按住適當(dāng)按鈕，彈出全局的對(duì)話框的持續(xù)時(shí)間     
     private static final int GLOBAL_ACTIONS_KEY_TIMEOUT = 500;     
              
     //定義一個(gè)touch事件中是點(diǎn)擊事件還是一個(gè)滑動(dòng)事件所需的時(shí)間，如果用戶在這個(gè)時(shí)間之內(nèi)滑動(dòng)，那么就認(rèn)為是一個(gè)點(diǎn)擊事件     
     private static final int TAP_TIMEOUT = 115;     
              
     /**    
      * Defines the duration in milliseconds we will wait to see if a touch event     
      * is a jump tap. If the user does not complete the jump tap within this interval, it is    
      * considered to be a tap.     
      */ 
     //定義一個(gè)touch事件時(shí)候是一個(gè)點(diǎn)擊事件。如果用戶在這個(gè)時(shí)間內(nèi)沒(méi)有完成這個(gè)點(diǎn)擊，那么就認(rèn)為是一個(gè)點(diǎn)擊事件     
     private static final int JUMP_TAP_TIMEOUT = 500;     
          
     //定義雙擊事件的間隔時(shí)間     
     private static final int DOUBLE_TAP_TIMEOUT = 300;     
              
     //定義一個(gè)縮放控制反饋到用戶界面的時(shí)間     
     private static final int ZOOM_CONTROLS_TIMEOUT = 3000;     
          
     /**    
      * Inset in pixels to look for touchable content when the user touches the edge of the screen    
      */ 
     private static final int EDGE_SLOP = 12;     
              
     /**    
      * Distance a touch can wander before we think the user is scrolling in pixels    
      */ 
     private static final int TOUCH_SLOP = 16;     
              
     /**    
      * Distance a touch can wander before we think the user is attempting a paged scroll    
      * (in dips)    
      */ 
     private static final int PAGING_TOUCH_SLOP = TOUCH_SLOP * 2;     
              
     /**    
      * Distance between the first touch and second touch to still be considered a double tap    
      */ 
     private static final int DOUBLE_TAP_SLOP = 100;     
              
     /**    
      * Distance a touch needs to be outside of a window's bounds for it to    
      * count as outside for purposes of dismissing the window.    
      */ 
     private static final int WINDOW_TOUCH_SLOP = 16;     
          
    //用來(lái)初始化fling的最小速度，單位是每秒多少像素     
     private static final int MINIMUM_FLING_VELOCITY = 50;     
              
     //用來(lái)初始化fling的最大速度，單位是每秒多少像素     
     private static final int MAXIMUM_FLING_VELOCITY = 4000;     
          
     //視圖繪圖緩存的最大尺寸，以字節(jié)表示。在ARGB888格式下，這個(gè)尺寸應(yīng)至少等于屏幕的大小     
     @Deprecated     
     private static final int MAXIMUM_DRAWING_CACHE_SIZE = 320 * 480 * 4; // HVGA screen, ARGB8888     
          
     //flings和scrolls摩擦力度大小的系數(shù)     
     private static float SCROLL_FRICTION = 0.015f;     
          
     /**    
      * Max distance to over scroll for edge effects    
      */ 
     private static final int OVERSCROLL_DISTANCE = 0;     
          
     /**    
      * Max distance to over fling for edge effects    
      */ 
     private static final int OVERFLING_DISTANCE = 4;     
          
 }