1 简介 VelocityTracker用于触摸事件的速度追踪，它可以获取当前触摸事件的速度值，根据速度值，我们可以判断当前的手势是否是fling等。...2 用法简介 先来看下VelocityTracker类对外提供的API接口 static VelocityTracker obtain() //获取VelocityTracker对象 void addMovement...使用该方法前要调用computeCurrentVelocity() */ float getYVelocity(int id) float getYVelocity() void clear() //重置velocityTracker...，回到初始状态 void recycle() //回收复用 用法如下，以onTouchEvent为例 Private VelocityTracker mVelocityTracker; public...if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain(); } switch
/4586793646,5298605a.html android.view.VelocityTracker 主要用跟踪触摸屏事件（flinging事件和其它gestures手势事件）的速率。...obtain () ;//获得VelocityTracker类实例 } mVelocityTracker....final VelocityTracker velocityTracker = mVelocityTracker; // 1000 provides pixels per second .... obtain () ;//获得VelocityTracker类实例 } mVelocityTracker. addMovement (ev); //将事件添�到VelocityTracker...类实例中 //推断当ev事件是MotionEvent.ACTION_UP时：计算速率 final VelocityTracker velocityTracker = mVelocityTracker
VelocityTracker在API中解释如下： Helper for tracking the velocity of touch events, for implementing flinging...; public class MainActivity extends Activity { private VelocityTracker velocityTracker; @Override...== null){ velocityTracker = VelocityTracker.obtain();//必须和recycle()配对 } velocityTracker.addMovement...(1000); int X = (int)velocityTracker.getXVelocity(); int Y = (int)velocityTracker.getYVelocity(...= null){ velocityTracker.recycle(); velocityTracker = null; } break; } return super.onTouchEvent
== null) { velocityTracker = VelocityTracker.obtain(); maxFlingVelocity = ViewConfiguration.get...= null) { velocityTracker.recycle(); velocityTracker = null; } //判断是否返回...== null) { velocityTracker = VelocityTracker.obtain(); maxFlingVelocity = ViewConfiguration.get(this...(1000, maxFlingVelocity); float velocityX = velocityTracker.getXVelocity(); if (velocityTracker !...= null) { velocityTracker.recycle(); velocityTracker = null; } //判断是否返回 if (downX < 50 && velocityX
1.2 VelocityTracker 翻译过来就是追踪速度，可以判断滑动的速度以及单击的速度，首先我们获取VelocityTracker对象velocityTracker = VelocityTracker.obtain...()；在View的onTouchEvent方法中添加：velocityTracker.addMovement(event); 首先要计算速度，计算速度传入计算的时间差值，那么求得的速度就是每像素/时间差...，比如我们计算在1S内的速度，代码如下： velocityTracker.computeCurrentVelocity(1000); int x = (int) velocityTracker.getXVelocity...(); int y = (int) velocityTracker.getYVelocity(); x和y分别为一秒内在x轴滑过的像素和一秒内在y轴滑过的像素。
文档里面提到的方法已经可以完成一些基本的需求，这里解释一下里面提到的方法的作用： //// 通过静态方法实例化这个类的一个对象 VelocityTracker velocityTracker = VelocityTracker.obtain...(); // 设置这个类要检测的触摸事件对象 velocityTracker.addMovement(event); // 设置计算速度的时间间隔（毫秒） velocityTracker.computeCurrentVelocity...velocityTracker = VelocityTracker.obtain(); // 这个接口用于随时获取触摸事件相关信息并返回(坐标、速度) private GetInfFromMotionEvent...velocityTracker = VelocityTracker.obtain(); // 这个接口用于随时获取触摸事件相关信息并返回(坐标、速度) private GetInfFromMotionEvent...(velocityTracker.getXVelocity()*1000); getInfFromMotionEvent.getYVelocity(velocityTracker.getYVelocity
velocityTracker; public MultiGroupHistogramView(Context context) { this(context, null); } public MultiGroupHistogramView...break; } } return super.onTouchEvent(event); } private void initVelocityTrackerIfNotExists() { if (velocityTracker...== null) { velocityTracker = VelocityTracker.obtain(); } } private void recycleVelocityTracker() { if...(velocityTracker !...= null) { velocityTracker.recycle(); velocityTracker = null; } } // ACTION_UP事件触发 private void fling(
(1000,maxVelocity); int dis= (int) velocityTracker.getYVelocity(pointerId); if(scrollOrientationEnum=...添加MotionEvent * * @see android.view.VelocityTracker#obtain() * @see android.view.VelocityTracker#addMovement...) { velocityTracker = VelocityTracker.obtain(); } velocityTracker.addMovement(event); } private int preLeft...=null) { velocityTracker.clear(); try { velocityTracker.recycle(); } catch (IllegalStateException e)...=null) { try { velocityTracker.clear(); velocityTracker.recycle(); } catch (IllegalStateException e)
VelocityTracker 概念： 速度追踪，用于追踪手指在滑动过程中的速度， 包括水平和竖直方向的速度。...使用过程： 首先，在View的onTouchEvent方法中追踪当前单击事件的速度： VelocityTracker velocityTracker = VelocityTracker.obtain(...);//实例化一个VelocityTracker 对象 velocityTracker.addMovement(event);//添加追踪事件 接着在对ACTION_UP事件的处理中 获取当前的速度。...velocityTracker .computeCurrentVelocity(1000);//获取速度前先计算速度，这里计算的是在1000ms内 float xVelocity = velocityTracker...最后不需要使用它时，需调用clear方法来重置,并回收内存： velocityTracker.clear(); velocityTracker.recycle(); GestureDetector
VelocityTracker 是用来记录手指滑动过程中的速度的，包括水平方向和数值方向。...velocityTracker = VelocityTracker.obtain(); velocityTracker.addMovement(event);...velocityTracker.computeCurrentVelocity(1000); float vX = velocityTracker.getXVelocity...+ ", vY = " + vY); velocityTracker.clear(); velocityTracker.recycle(...： velocityTracker.clear(); velocityTracker.recycle(); ---- GestureDetector GestureDetector 即手势检测，用于辅助我们捕获用户的
3.在测试过程中，如果用户意图是上下滑动时，那么手指在y轴移动速度（我们按每秒移动的像素值，可通过VelocityTracker类计算）非常大，通常在几千到过万，而在正常的水平滑动时，y轴的移动速度通常只有...android.app.Activity; import android.os.Bundle; import android.view.MotionEvent; import android.view.VelocityTracker...private VelocityTracker mVelocityTracker; @Override protected void onCreate(Bundle savedInstanceState...对象，并将触摸界面的滑动事件加入到VelocityTracker当中。...(); } mVelocityTracker.addMovement(event); } /** * 回收VelocityTracker对象。
velocityTracker = VelocityTracker.obtain();//1.VelocityTracker的创建 } ---->[FlowerLayout#onTouchEvent]...break; case MotionEvent.ACTION_MOVE: velocityTracker.computeCurrentVelocity(1000)...;//3.计算速度 //4.获取值 Log.e(TAG, "X velocity: " + velocityTracker.getXVelocity()+..."--Y velocity: " + velocityTracker.getYVelocity()); break; case...break; } return true; } |--注意第5点：在适当的地方取消和回收 velocityTracker.clear();//取消 velocityTracker.recycle
android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.VelocityTracker...SPEED = 8.5f; private boolean isMeasured = false; /** * 用于计算手滑动的速度 */ private VelocityTracker...case MotionEvent.ACTION_DOWN: if (vt == null) vt = VelocityTracker.obtain...();//获得VelocityTracker类实例 else vt.clear(); mLastY...break; case MotionEvent.ACTION_MOVE: vt.addMovement(ev);//将事件加入到VelocityTracker
val pointerId = down.id // 记录手指滑动速度 val velocityTracker...= VelocityTracker() // Stop any ongoing animation. // 停止任何正在进行的动画...import androidx.compose.ui.input.pointer.positionChange import androidx.compose.ui.input.pointer.util.VelocityTracker...onPause() val pointerId = down.id val velocityTracker...= VelocityTracker() // Stop any ongoing animation.
case MotionEvent.ACTION_UP: if (mIsBeingDragged) { final VelocityTracker velocityTracker...= mVelocityTracker; velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);...// 获取拖动速度 int initialVelocity = (int) velocityTracker.getYVelocity(mActivePointerId);
Android为我们提供了VelocityTracker这个类检测速率 使用mVelocityTracker = VelocityTracker.obtain();来初始化 使用mVelocityTracker.addMovement...private int defaultScreen = 0; private Scroller mScroller; private float mLastMotionX = 0; private VelocityTracker...event.getX(); switch (action) { case MotionEvent.ACTION_DOWN: if(mVelocityTracker==null){ mVelocityTracker = VelocityTracker.obtain
android.content.Context; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.VelocityTracker...extends ViewGroup { private static final String TAG = "Workspace"; private Scroller mScroller; private VelocityTracker...mLastMotionX - x); mLastMotionX = x; scrollBy(deltaX, 0); break; case MotionEvent.ACTION_UP: final VelocityTracker...velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000); int velocityX =...(int) velocityTracker.getXVelocity(); if (velocityX SNAP_VELOCITY && mCurScreen 0) { snapToScreen
android.os.AsyncTask; 8 import android.os.Bundle; 9 import android.view.MotionEvent; 10 import android.view.VelocityTracker...80 */ 81 private VelocityTracker mVelocityTracker; 82 @Override 83 protected void...scrollToContent() { 206 new ScrollTask().execute(-30); 207 } 208 209 /** 210 * 创建VelocityTracker...对象，并将触摸content界面的滑动事件加入到VelocityTracker当中。...MotionEvent event) { 216 if (mVelocityTracker == null) { 217 mVelocityTracker = VelocityTracker.obtain
MotionEvent.ACTION_UP: Log.e(TAG, "event : up"); // if (mTouchState == TOUCH_STATE_SCROLLING) { final VelocityTracker...velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000); int velocityX = (int...) velocityTracker.getXVelocity(); Log.e(TAG, "velocityX:" + velocityX); if (velocityX SNAP_VELOCITY...velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000); int velocityX = (int...) velocityTracker.getXVelocity(); Log.e(TAG, "velocityX:" + velocityX); if (velocityX SNAP_VELOCITY
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