ViewConfiguration.get(context).getScaledTouchSlop()详解

本文详细介绍了Android系统中ViewConfiguration类的各种滑动参数及其作用,包括触摸事件判定、滑动距离阈值等关键配置,有助于开发者更好地理解并调整滑动行为。

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转载请注明出处 http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2013/0225/907.html


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。如果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:

/**    
  * 包含了方法和标准的常量用来设置UI的超时、大小和距离    
  */
 public class ViewConfiguration {     
     // 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     
     private static final int SCROLL_BAR_SIZE = 10;     
           
     //定义滚动条逐渐消失的时间,单位是毫秒     
     private static final int SCROLL_BAR_FADE_DURATION = 250;     
           
     // 默认的滚动条多少秒之后消失,单位是毫秒     
     private static final int SCROLL_BAR_DEFAULT_DELAY = 300;     
           
     // 定义边缘地方褪色的长度     
     private static final int FADING_EDGE_LENGTH = 12;     
           
     //定义子控件按下状态的持续事件     
     private static final int PRESSED_STATE_DURATION = 125;     
               
     //定义一个按下状态转变成长按状态的转变时间     
     private static final int LONG_PRESS_TIMEOUT = 500;     
               
     //定义用户在按住适当按钮,弹出全局的对话框的持续时间     
     private static final int GLOBAL_ACTIONS_KEY_TIMEOUT = 500;     
               
     //定义一个touch事件中是点击事件还是一个滑动事件所需的时间,如果用户在这个时间之内滑动,那么就认为是一个点击事件     
     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.     
      */
     //定义一个touch事件时候是一个点击事件。如果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     
     private static final int JUMP_TAP_TIMEOUT = 500;     
           
     //定义双击事件的间隔时间     
     private static final int DOUBLE_TAP_TIMEOUT = 300;     
               
     //定义一个缩放控制反馈到用户界面的时间     
     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;     
           
    //用来初始化fling的最小速度,单位是每秒多少像素     
     private static final int MINIMUM_FLING_VELOCITY = 50;     
               
     //用来初始化fling的最大速度,单位是每秒多少像素     
     private static final int MAXIMUM_FLING_VELOCITY = 4000;     
           
     //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     
     @Deprecated     
     private static final int MAXIMUM_DRAWING_CACHE_SIZE = 320 * 480 * 4; // HVGA screen, ARGB8888     
           
     //flings和scrolls摩擦力度大小的系数     
     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;   


2025-07-06 16:25:10.644 936-936 ViewConfiguration com.android.launcher3 E Tried to access UI constants from a non-visual Context:com.android.quickstep.inputconsumers.OtherActivityInputConsumer@d0ca171UI constants, such as display metrics or window metrics, must be accessed from Activity or other visual Context. Use an Activity or a Context created with Context#createWindowContext(int, Bundle), which are adjusted to the configuration and visual bounds of an area on screen java.lang.IllegalArgumentException: Tried to access UI constants from a non-visual Context:com.android.quickstep.inputconsumers.OtherActivityInputConsumer@d0ca171 at android.view.ViewConfiguration.get(ViewConfiguration.java:510) at com.android.quickstep.inputconsumers.OtherActivityInputConsumer.<init>(OtherActivityInputConsumer.java:163) at com.android.quickstep.TouchInteractionService.createOtherActivityInputConsumer(TouchInteractionService.java:709) at com.android.quickstep.TouchInteractionService.newBaseConsumer(TouchInteractionService.java:692) at com.android.quickstep.TouchInteractionService.newConsumer(TouchInteractionService.java:587) at com.android.quickstep.TouchInteractionService.onInputEvent(TouchInteractionService.java:493) at com.android.quickstep.TouchInteractionService.lambda$5N8OpQhfWV7_tkhenf8Ys3ECXWs(Unknown Source:0) at com.android.quickstep.-$$Lambda$TouchInteractionService$5N8OpQhfWV7_tkhenf8Ys3ECXWs.onInputEvent(Unknown Source:2) at com.android.systemui.shared.system.InputChannelCompat$InputEventReceiver$1.onInputEvent(InputChannelCompat.java:81) at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:220) at android.os.MessageQueue.nativePollOnce(Native Method) at android.os.MessageQueue.next(MessageQueue.java:335) at android.os.Looper.loop(Looper.java:183) at android.app.ActivityThread.main(ActivityThread.java:7660) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
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07-07
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