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;
//定義子控件按下狀態(tài)的持續(xù)事件
private static final int PRESSED_STATE_DURATION = 125;
//定義一個(gè)按下狀態(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;
}