API google provided, there is a class , we are familiar with , GestureDetector. Use it, we can identify the user usually use gestures. However , this class does not support multi-touch ( do not think anyone could google in a few fingers on the screen, use gestures it ~ ) , however, and my friends do together recent App, indeed used a multi-point gestures ( mainly onScroll and onFling two gestures ) , so I took this class to expand a bit, to achieve so that each followed by a number of controls to achieve the effect of dragging with your finger and sliding .
By the way, we should all know, Android3.0 after allocation mechanisms Android touch events and previous versions are different . Starting with 3.0 , touch Messaging users on different operating controls do not interfere with each other to produce , touch the message will be assigned to a different control on touchListener processing . And
In previous versions, all touch messages will be routed to the first encounter of the screen controls the operation of the fingers of touchListener processing , that is, is there such a contradictory phenomenon:
at the interface have A, B, C three controls , and then , when you first use the index finger and hold the A, and then again with the middle finger and ring finger ( Well , other fingers also, do not middle finger or ring finger cares ) Hold B, C. And moving means which , when the ring finger , B and C can not receive the ACTION_MOVE message and the received message is A. In version 3.0 and above , this problem does not exist .
use the following class , can be achieved from the 2.2 to 3.2 gesture recognition platform compatible .
began paste code :
package com.finger.utils;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.ViewConfiguration;
public class MultiTouchGestureDetector {
@SuppressWarnings("unused")
private static final String MYTAG = "Ray";
public static final String CLASS_NAME = "MultiTouchGestureDetector";
/**
* 事件信息类 <br/>
* 用来记录一个手势
*/
private class EventInfo {
private MultiMotionEvent mCurrentDownEvent; //当前的down事件
private MultiMotionEvent mPreviousUpEvent; //上一次up事件
private boolean mStillDown; //当前手指是否还在屏幕上
private boolean mInLongPress; //当前事件是否属于长按手势
private boolean mAlwaysInTapRegion; //是否当前手指仅在小范围内移动，当手指仅在小范围内移动时，视为手指未曾移动过，不会触发onScroll手势
private boolean mAlwaysInBiggerTapRegion; //是否当前手指在较大范围内移动，仅当此值为true时，双击手势才能成立
private boolean mIsDoubleTapping; //当前手势，是否为双击手势
private float mLastMotionY; //最后一次事件的X坐标
private float mLastMotionX; //最后一次事件的Y坐标
private EventInfo(MotionEvent e) {
this(new MultiMotionEvent(e));
}
private EventInfo(MultiMotionEvent me) {
mCurrentDownEvent = me;
mStillDown = true;
mInLongPress = false;
mAlwaysInTapRegion = true;
mAlwaysInBiggerTapRegion = true;
mIsDoubleTapping = false;
}
//释放MotionEven对象，使系统能够继续使用它们
public void recycle() {
if (mCurrentDownEvent != null) {
mCurrentDownEvent.recycle();
mCurrentDownEvent = null;
}
if (mPreviousUpEvent != null) {
mPreviousUpEvent.recycle();
mPreviousUpEvent = null;
}
}
@Override
public void finalize() {
this.recycle();
}
}
/**
* 多点事件类 <br/>
* 将一个多点事件拆分为多个单点事件，并方便获得事件的绝对坐标
* <br/> 绝对坐标用以在界面中找到触点所在的控件
* @author ray-ni
*/
public class MultiMotionEvent {
private MotionEvent mEvent;
private int mIndex;
private MultiMotionEvent(MotionEvent e) {
mEvent = e;
mIndex = (e.getAction() & MotionEvent.ACTION_POINTER_ID_MASK) >> MotionEvent.ACTION_POINTER_ID_SHIFT; //等效于 mEvent.getActionIndex();
}
private MultiMotionEvent(MotionEvent e, int idx) {
mEvent = e;
mIndex = idx;
}
// 行为
public int getAction() {
int action = mEvent.getAction() & MotionEvent.ACTION_MASK; //等效于 mEvent.getActionMasked();
switch (action) {
case MotionEvent.ACTION_POINTER_DOWN:
action = MotionEvent.ACTION_DOWN;
break;
case MotionEvent.ACTION_POINTER_UP:
action = MotionEvent.ACTION_UP;
break;
}
return action;
}
// 返回X的绝对坐标
public float getX() {
return mEvent.getX(mIndex) + mEvent.getRawX() - mEvent.getX();
}
// 返回Y的绝对坐标
public float getY() {
return mEvent.getY(mIndex) + mEvent.getRawY() - mEvent.getY();
}
// 事件发生的时间
public long getEventTime() {
return mEvent.getEventTime();
}
// 事件序号
public int getIndex() {
return mIndex;
}
// 事件ID
public int getId() {
return mEvent.getPointerId(mIndex);
}
// 释放事件对象，使系统能够继续使用
public void recycle() {
if (mEvent != null) {
mEvent.recycle();
mEvent = null;
}
}
}
// 多点手势监听器
public interface MultiTouchGestureListener {
// 手指触碰到屏幕，由一个 ACTION_DOWN触发
boolean onDown(MultiMotionEvent e);
// 确定一个press事件，强调手指按下的一段时间（TAP_TIMEOUT）内，手指未曾移动或抬起
void onShowPress(MultiMotionEvent e);
// 手指点击屏幕后离开，由 ACTION_UP引发，可以简单的理解为单击事件，即手指点击时间不长（未构成长按事件），也不曾移动过
boolean onSingleTapUp(MultiMotionEvent e);
// 长按，手指点下后一段时间（DOUBLE_TAP_TIMEOUT）内，不曾抬起或移动
void onLongPress(MultiMotionEvent e);
// 拖动，由ACTION_MOVE触发，手指地按下后，在屏幕上移动
boolean onScroll(MultiMotionEvent e1, MultiMotionEvent e2, float distanceX, float distanceY);
// 滑动，由ACTION_UP触发，手指按下并移动一段距离后，抬起时触发
boolean onFling(MultiMotionEvent e1, MultiMotionEvent e2, float velocityX, float velocityY);
}
// 多点双击监听器
public interface MultiTouchDoubleTapListener {
// 单击事件确认，强调第一个单击事件发生后，一段时间内，未发生第二次单击事件，即确定不会触发双击事件
boolean onSingleTapConfirmed(MultiMotionEvent e);
// 双击事件， 由ACTION_DOWN触发，从第一次单击事件的DOWN事件开始的一段时间(DOUBLE_TAP_TIMEOUT)内结束（即手指），
// 并且在第一次单击事件的UP时间开始后的一段时间内（DOUBLE_TAP_TIMEOUT）发生第二次单击事件，
// 除此之外两者坐标间距小于定值（DOUBLE_TAP_SLAP）时，则触发双击事件
boolean onDoubleTap(MultiMotionEvent e);
// 双击事件，与onDoubleTap事件不同之处在于，构成双击的第二次点击的ACTION_DOWN,ACTION_MOVE和ACTION_UP都会触发该事件
boolean onDoubleTapEvent(MultiMotionEvent e);
}
// 事件信息队列，队列的下标与MotionEvent的pointId对应
private static List<EventInfo> sEventInfos = new ArrayList<EventInfo>(10);
// 双击判断队列，这个队列中的元素等待双击超时的判断结果
private static List<EventInfo> sEventForDoubleTap = new ArrayList<EventInfo>(5);
// 指定大点击区域的大小（这个比较拗口），这个值主要用于帮助判断双击是否成立
private int mBiggerTouchSlopSquare = 20 * 20;
// 判断是否构成onScroll手势，当手指在这个范围内移动时，不触发onScroll手势
private int mTouchSlopSquare;
// 判断是否构成双击，只有两次点击的距离小于该值，才能构成双击手势
private int mDoubleTapSlopSquare;
// 最小滑动速度
private int mMinimumFlingVelocity;
// 最大滑动速度
private int mMaximumFlingVelocity;
// 长按阀值，当手指按下后，在该阀值的时间内，未移动超过mTouchSlopSquare的距离并未抬起，则长按手势触发
private static final int LONGPRESS_TIMEOUT = ViewConfiguration.getLongPressTimeout();
// showPress手势的触发阀值，当手指按下后，在该阀值的时间内，未移动超过mTouchSlopSquare的距离并未抬起，则showPress手势触发
private static final int TAP_TIMEOUT = ViewConfiguration.getTapTimeout();
// 双击超时阀值，仅在两次双击事件的间隔（第一次单击的UP事件和第二次单击的DOWN事件）小于此阀值，双击事件才能成立
private static final int DOUBLE_TAP_TIMEOUT = ViewConfiguration.getDoubleTapTimeout();
// 双击区域阀值，仅在两次双击事件的距离小于此阀值，双击事件才能成立
private static final int DOUBLE_TAP_SLAP = 64;
// GestureHandler所处理的Message的what属性可能为以下 常量：
// showPress手势
private static final int SHOW_PRESS = 1;
// 长按手势
private static final int LONG_PRESS = 2;
// SingleTapConfirmed手势
private static final int TAP_SINGLE = 3;
// 双击手势
private static final int TAP_DOUBLE = 4;
// 手势处理器
private final GestureHandler mHandler;
// 手势监听器
private final MultiTouchGestureListener mListener;
// 双击监听器
private MultiTouchDoubleTapListener mDoubleTapListener;
// 长按允许阀值
private boolean mIsLongpressEnabled;
// 速度追踪器
private VelocityTracker mVelocityTracker;
private class GestureHandler extends Handler {
GestureHandler() {
super();
}
GestureHandler(Handler handler) {
super(handler.getLooper());
}
@Override
public void handleMessage(Message msg) {
int idx = (Integer) msg.obj;
switch (msg.what) {
case SHOW_PRESS: {
if (idx >= sEventInfos.size()) {
// Log.w(MYTAG, CLASS_NAME + ":handleMessage, msg.what = SHOW_PRESS, idx=" + idx + ", while sEventInfos.size()="
// + sEventInfos.size());
break;
}
EventInfo info = sEventInfos.get(idx);
if (info == null) {
// Log.e(MYTAG, CLASS_NAME + ":handleMessage, msg.what = SHOW_PRESS, idx=" + idx + ", Info = null");
break;
}
// 触发手势监听器的onShowPress事件
mListener.onShowPress(info.mCurrentDownEvent);
break;
}
case LONG_PRESS: {
// Log.d(MYTAG, CLASS_NAME + ":trigger LONG_PRESS");
if (idx >= sEventInfos.size()) {
// Log.w(MYTAG, CLASS_NAME + ":handleMessage, msg.what = LONG_PRESS, idx=" + idx + ", while sEventInfos.size()="
// + sEventInfos.size());
break;
}
EventInfo info = sEventInfos.get(idx);
if (info == null) {
// Log.e(MYTAG, CLASS_NAME + ":handleMessage, msg.what = LONG_PRESS, idx=" + idx + ", Info = null");
break;
}
dispatchLongPress(info, idx);
break;
}
case TAP_SINGLE: {
// Log.d(MYTAG, CLASS_NAME + ":trriger TAP_SINGLE");
// If the user's finger is still down, do not count it as a tap
if (idx >= sEventInfos.size()) {
// Log.e(MYTAG, CLASS_NAME + ":handleMessage, msg.what = TAP_SINGLE, idx=" + idx + ", while sEventInfos.size()="
// + sEventInfos.size());
break;
}
EventInfo info = sEventInfos.get(idx);
if (info == null) {
// Log.e(MYTAG, CLASS_NAME + ":handleMessage, msg.what = TAP_SINGLE, idx=" + idx + ", Info = null");
break;
}
if (mDoubleTapListener != null && !info.mStillDown) { //手指在双击超时的阀值内未离开屏幕进行第二次单击事件，则确定单击事件成立（不再触发双击事件）
mDoubleTapListener.onSingleTapConfirmed(info.mCurrentDownEvent);
}
break;
}
case TAP_DOUBLE: {
if (idx >= sEventForDoubleTap.size()) {
// Log.w(MYTAG, CLASS_NAME + ":handleMessage, msg.what = TAP_DOUBLE, idx=" + idx + ", while sEventForDoubleTap.size()="
// + sEventForDoubleTap.size());
break;
}
EventInfo info = sEventForDoubleTap.get(idx);
if (info == null) {
// Log.w(MYTAG, CLASS_NAME + ":handleMessage, msg.what = TAP_DOUBLE, idx=" + idx + ", Info = null");
break;
}
sEventForDoubleTap.set(idx, null);// 这个没什么好做的，就是把队列中对应的元素清除而已
break;
}
default:
throw new RuntimeException("Unknown message " + msg); // never
}
}
}
/**
* 触发长按事件
* @param info
* @param idx
*/
private void dispatchLongPress(EventInfo info, int idx) {
mHandler.removeMessages(TAP_SINGLE, idx);//移除单击事件确认
info.mInLongPress = true;
mListener.onLongPress(info.mCurrentDownEvent);
}
------ Solution ------------------------------------- -------
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- ----- Solution --------------------------------------------
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- ---- Solution -------------------------------------------- < br>
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/ **
* Constructor 2
* @ param context
* @ param listener
* @ param handler
* /
public MultiTouchGestureDetector (Context context, MultiTouchGestureListener listener, Handler handler) {
if (handler! = null) {
mHandler = new GestureHandler (handler);
} else {
mHandler = new GestureHandler ();
}
mListener = listener;
if (listener instanceof MultiTouchDoubleTapListener) {
setOnDoubleTapListener ((MultiTouchDoubleTapListener) listener);
}
init (context);
}
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very good. I top
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Results posted the ~
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Thank you for expert advice !
----- - Solution --------------------------------------------
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is very good ah
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too strong. . .
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and single- precision would mean the same?
------ eference --------------------------------------- < br>
/**
* 构造器1
* @param context
* @param listener
*/
public MultiTouchGestureDetector(Context context, MultiTouchGestureListener listener) {
this(context, listener, null);
}
/**
* 构造器2
* @param context
* @param listener
* @param handler
*/
public MultiTouchGestureDetector(Context context, MultiTouchGestureListener listener, Handler handler) {
if (handler != null) {
mHandler = new GestureHandler(handler);
} else {
mHandler = new GestureHandler();
}
mListener = listener;
if (listener instanceof MultiTouchDoubleTapListener) {
setOnDoubleTapListener((MultiTouchDoubleTapListener) listener);
}
init(context);
}
/**
* 初始化识别器
* @param context
*/
private void init(Context context) {
if (mListener == null) {
throw new NullPointerException("OnGestureListener must not be null");
}
mIsLongpressEnabled = true;
int touchSlop, doubleTapSlop;
if (context == null) {
touchSlop = ViewConfiguration.getTouchSlop();
doubleTapSlop = DOUBLE_TAP_SLAP;
mMinimumFlingVelocity = ViewConfiguration.getMinimumFlingVelocity();
mMaximumFlingVelocity = ViewConfiguration.getMaximumFlingVelocity();
} else {//允许识别器在App中，使用偏好的设定
final ViewConfiguration configuration = ViewConfiguration.get(context);
touchSlop = configuration.getScaledTouchSlop();
doubleTapSlop = configuration.getScaledDoubleTapSlop();
mMinimumFlingVelocity = configuration.getScaledMinimumFlingVelocity();
mMaximumFlingVelocity = configuration.getScaledMaximumFlingVelocity();
}
mTouchSlopSquare = touchSlop * touchSlop / 16;
mDoubleTapSlopSquare = doubleTapSlop * doubleTapSlop;
}
/**
* 设置双击监听器
* @param onDoubleTapListener
*/
public void setOnDoubleTapListener(MultiTouchDoubleTapListener onDoubleTapListener) {
mDoubleTapListener = onDoubleTapListener;
}
/**
* 设置是否允许长按
* @param isLongpressEnabled
*/
public void setIsLongpressEnabled(boolean isLongpressEnabled) {
mIsLongpressEnabled = isLongpressEnabled;
}
/**
* 判断是否允许长按
* @return
*/
public boolean isLongpressEnabled() {
return mIsLongpressEnabled;
}
/**
* 判断当前事件是否为双击事件
* <br/> 通过遍历sEventForDoubleTap来匹配是否存在能够构成双击事件的单击事件
* @param e
* @return
*/
private EventInfo checkForDoubleTap(MultiMotionEvent e) {
if (sEventForDoubleTap.isEmpty()) {
// Log.e(MYTAG, CLASS_NAME + ":checkForDoubleTap(), sEventForDoubleTap is empty !");
return null;
}
for (int i = 0; i < sEventForDoubleTap.size(); i++) {
EventInfo info = sEventForDoubleTap.get(i);
if (info != null && isConsideredDoubleTap(info, e)) {
sEventForDoubleTap.set(i, null);// 这个单击事件已经被消耗了，所以置为null
mHandler.removeMessages(TAP_DOUBLE, i);// 移除Handler内的为处理消息
return info;
}
}
return null;
}
/**
* 判断当前按下事件是否能和指定的单击事件构成双击事件
*
* @param info
* @param secondDown
* @return
*/
private boolean isConsideredDoubleTap(EventInfo info, MultiMotionEvent secondDown) {
if (!info.mAlwaysInBiggerTapRegion) { //如多第一次单击事件有过较大距离的移动，则无法构成双击事件
return false;
}
if (secondDown.getEventTime() - info.mPreviousUpEvent.getEventTime() > DOUBLE_TAP_TIMEOUT) {
//如果第一次单击的UP时间和第二次单击的down时间时间间隔大于DOUBLE_TAP_TIMEOUT，也无法构成双击事件
return false;
}
int deltaX = (int) info.mCurrentDownEvent.getX() - (int) secondDown.getX();
int deltaY = (int) info.mCurrentDownEvent.getY() - (int) secondDown.getY();
return (deltaX * deltaX + deltaY * deltaY < mDoubleTapSlopSquare);//最后判断两次单击事件的距离
}
/**
* 将事件信息放入双击判断队列，并返回序号
*
* @param info
* @return
*/
private int addIntoTheMinIndex(EventInfo info) {
for (int i = 0; i < sEventForDoubleTap.size(); i++) {
if (sEventForDoubleTap.get(i) == null) {
sEventForDoubleTap.set(i, info);
return i;
}
}
sEventForDoubleTap.add(info);
return sEventForDoubleTap.size() - 1;
}
/**
* 从事件信息队列中移除指定序号的事件
*
* @param idx
*/
private void removeEventFromList(int id) {
if (id > sEventInfos.size() || id < 0) {
// Log.e(MYTAG, CLASS_NAME + ".removeEventFromList(), id=" + id + ", while sEventInfos.size() =" + sEventInfos.size());
return;
}
sEventInfos.set(id, null);
}
/**
* 向事件队列中添加新信息
*
* @param e
*/
private void addEventIntoList(EventInfo info) {
int id = info.mCurrentDownEvent.getId();
if (id < sEventInfos.size()) {
// if (sEventInfos.get(id) != null)
// Log.e(MYTAG, CLASS_NAME + ".addEventIntoList, info(" + id + ") has not set to null !");
sEventInfos.set(info.mCurrentDownEvent.getId(), info);
} else if (id == sEventInfos.size()) {
sEventInfos.add(info);
} else {
// Log.e(MYTAG, CLASS_NAME + ".addEventIntoList, invalidata id !");
}
}
------ eference ----------------------------------- ----
public boolean onTouchEvent(MotionEvent ev) {
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
}
mVelocityTracker.addMovement(ev);//把所有事件都添加到速度追踪器，为计算速度做准备
boolean handled = false;
final int action = ev.getAction(); //获取Action
// int idx = (action & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;//获取触摸事件的序号
int idx = ev.getPointerId(ev.getActionIndex());//获取触摸事件的id
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_POINTER_DOWN: {
EventInfo info = new EventInfo(MotionEvent.obtain(ev));
this.addEventIntoList(info);//将手势信息保存到队列中
if (mDoubleTapListener != null) {//如果双击监听器不为null
if (mHandler.hasMessages(TAP_DOUBLE)) {
MultiMotionEvent e = new MultiMotionEvent(ev);
EventInfo origInfo = checkForDoubleTap(e);//检查是否构成双击事件
if (origInfo != null) {
info.mIsDoubleTapping = true;
handled |= mDoubleTapListener.onDoubleTap(origInfo.mCurrentDownEvent);
handled |= mDoubleTapListener.onDoubleTapEvent(e);
}
}
if (!info.mIsDoubleTapping) {//当前事件不构成双击事件，那么发送延迟消息以判断onSingleTapConfirmed事件
mHandler.sendMessageDelayed(mHandler.obtainMessage(TAP_SINGLE, idx), DOUBLE_TAP_TIMEOUT);
// Log.d(MYTAG, CLASS_NAME + ": add TAP_SINGLE");
}
}
// 记录X坐标和Y坐标
info.mLastMotionX = info.mCurrentDownEvent.getX();
info.mLastMotionY = info.mCurrentDownEvent.getY();
if (mIsLongpressEnabled) {//允许长按
mHandler.removeMessages(LONG_PRESS, idx);
mHandler.sendMessageAtTime(mHandler.obtainMessage(LONG_PRESS, idx), info.mCurrentDownEvent.getEventTime() + TAP_TIMEOUT
+ LONGPRESS_TIMEOUT);//延时消息以触发长按手势
// Log.d(MYTAG, CLASS_NAME +
// ":add LONG_PRESS to handler for idx " + idx);
}
mHandler.sendMessageAtTime(mHandler.obtainMessage(SHOW_PRESS, idx), info.mCurrentDownEvent.getEventTime() + TAP_TIMEOUT);// 延时消息，触发showPress手势
handled |= mListener.onDown(info.mCurrentDownEvent);//触发onDown（）
break;
}
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP: {
MultiMotionEvent currentUpEvent = new MultiMotionEvent(ev);
if (idx >= sEventInfos.size()) {
// Log.e(MYTAG, CLASS_NAME + ":ACTION_POINTER_UP, idx=" + idx + ", while sEventInfos.size()=" + sEventInfos.size());
break;
}
EventInfo info = sEventInfos.get(currentUpEvent.getId());
if (info == null) {
// Log.e(MYTAG, CLASS_NAME + ":ACTION_POINTER_UP, idx=" + idx + ", Info = null");
break;
}
info.mStillDown = false;
if (info.mIsDoubleTapping) { //处于双击状态，则触发onDoubleTapEvent事件
handled |= mDoubleTapListener.onDoubleTapEvent(currentUpEvent);
} else if (info.mInLongPress) {//处于长按状态
mHandler.removeMessages(TAP_SINGLE, idx);//可以无视这行代码
info.mInLongPress = false;
} else if (info.mAlwaysInTapRegion) {//尚未移动过
if (mHandler.hasMessages(TAP_SINGLE, idx)) {//还在双击的时间阀值内，所以要为双击判断做额外处理
mHandler.removeMessages(TAP_SINGLE, idx);
info.mPreviousUpEvent = new MultiMotionEvent(MotionEvent.obtain(ev));
int index = this.addIntoTheMinIndex(info);// 把当前事件放入队列，等待双击的判断
mHandler.sendMessageAtTime(mHandler.obtainMessage(TAP_DOUBLE, index), info.mCurrentDownEvent.getEventTime()
+ DOUBLE_TAP_TIMEOUT); // 将双击超时判断添加到Handler
// Log.d(MYTAG, CLASS_NAME + ": add TAP_DOUBLE");
}
handled = mListener.onSingleTapUp(currentUpEvent);//触发onSingleTapUp事件
} else {
// A fling must travel the minimum tap distance
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000, mMaximumFlingVelocity);//计算1秒钟内的滑动速度
//获取X和Y方向的速度
final float velocityX = velocityTracker.getXVelocity(idx);
final float velocityY = velocityTracker.getYVelocity(idx);
// Log.i(MYTAG, CLASS_NAME + ":ACTION_POINTER_UP, idx=" + idx +
// ", vx=" + velocityX + ", vy=" + velocityY);
// 触发滑动事件
if ((Math.abs(velocityY) > mMinimumFlingVelocity) || (Math.abs(velocityX) > mMinimumFlingVelocity)) {
handled = mListener.onFling(info.mCurrentDownEvent, currentUpEvent, velocityX, velocityY);
}
}
// Hold the event we obtained above - listeners may have changed the
// original.
if (action == MotionEvent.ACTION_UP) { //释放速度追踪器
mVelocityTracker.recycle();
mVelocityTracker = null;
// Log.w(MYTAG, CLASS_NAME +
// ":ACTION_POINTER_UP, mVelocityTracker.recycle()");
}
info.mIsDoubleTapping = false;
// Log.d(MYTAG, CLASS_NAME + "remove LONG_PRESS");
// 移除showPress和长按消息
mHandler.removeMessages(SHOW_PRESS, idx);
mHandler.removeMessages(LONG_PRESS, idx);
removeEventFromList(currentUpEvent.getId());//手指离开，则从队列中删除手势信息
break;
}
case MotionEvent.ACTION_MOVE:
for (int rIdx = 0; rIdx < ev.getPointerCount(); rIdx++) {//因为无法确定当前发生移动的是哪个手指，所以遍历处理所有手指
MultiMotionEvent e = new MultiMotionEvent(ev, rIdx);
if (e.getId() >= sEventInfos.size()) {
// Log.e(MYTAG, CLASS_NAME + ":ACTION_MOVE, idx=" + rIdx + ", while sEventInfos.size()=" + sEventInfos.size());
break;
}
EventInfo info = sEventInfos.get(e.getId());
if (info == null) {
// Log.e(MYTAG, CLASS_NAME + ":ACTION_MOVE, idx=" + rIdx + ", Info = null");
break;
}
if (info.mInLongPress) { //长按，则不处理move事件
break;
}
//当前坐标
float x = e.getX();
float y = e.getY();
//距离上次事件移动的位置
final float scrollX = x - info.mLastMotionX;
final float scrollY = y - info.mLastMotionY;
if (info.mIsDoubleTapping) {//双击事件
handled |= mDoubleTapListener.onDoubleTapEvent(e);
} else if (info.mAlwaysInTapRegion) {//该手势尚未移动过（移动的距离小于mTouchSlopSquare,视为未移动过）
// 计算从落下到当前事件，移动的距离
final int deltaX = (int) (x - info.mCurrentDownEvent.getX());
final int deltaY = (int) (y - info.mCurrentDownEvent.getY());
// Log.d(MYTAG, CLASS_NAME + "deltaX="+deltaX+";deltaY=" +
// deltaX +"mTouchSlopSquare=" + mTouchSlopSquare);
int distance = (deltaX * deltaX) + (deltaY * deltaY);
if (distance > mTouchSlopSquare) { // 移动距离超过mTouchSlopSquare
handled = mListener.onScroll(info.mCurrentDownEvent, e, scrollX, scrollY);
info.mLastMotionX = e.getX();
info.mLastMotionY = e.getY();
info.mAlwaysInTapRegion = false;
// Log.d(MYTAG, CLASS_NAME +
// ":remove LONG_PRESS for idx" + rIdx +
// ",mTouchSlopSquare("+mTouchSlopSquare+"), distance("+distance+")");
// 清除onSingleTapConform，showPress,longPress三种消息
int id = e.getId();
mHandler.removeMessages(TAP_SINGLE, id);
mHandler.removeMessages(SHOW_PRESS, id);
mHandler.removeMessages(LONG_PRESS, id);
}
if (distance > mBiggerTouchSlopSquare) {//移动距离大于mBiggerTouchSlopSquare，则无法构成双击事件
info.mAlwaysInBiggerTapRegion = false;
}
} else if ((Math.abs(scrollX) >= 1) || (Math.abs(scrollY) >= 1)) {//之前已经移动过了
handled = mListener.onScroll(info.mCurrentDownEvent, e, scrollX, scrollY);
info.mLastMotionX = x;
info.mLastMotionY = y;
}
}
break;
case MotionEvent.ACTION_CANCEL:
cancel();//清理
}
return handled;
}
// 清理所有队列
private void cancel() {
mHandler.removeMessages(SHOW_PRESS);
mHandler.removeMessages(LONG_PRESS);
mHandler.removeMessages(TAP_SINGLE);
mVelocityTracker.recycle();
mVelocityTracker = null;
sEventInfos.clear();
sEventForDoubleTap.clear();
}
} Finally, hang a tiny ad here :
I wrote App and friends here , I hope to give a support:
electronics market link address Youtube demo video 1 (see over the wall ) Youtube demo video 2 (see over the wall ) ------ eference ---------------------------------------
Oh, thank you
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The reply was deleted at 2011-12-07 09:38:16 moderator
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The reply was deleted at the moderator 2011-12-07 10:37:32
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The reply was deleted at the moderator 2011-12-08 10:00:09
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The reply was deleted at the moderator 2011-12-07 09:39:44
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The reply was deleted at the moderator 2011-12-07 10:39:47
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The reply was deleted at the moderator 2011-12-07 09:22:04
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The reply was deleted at 2011-12-07 09:42:22 moderator
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The reply was deleted at 2011-12-07 09:24:47 moderator
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The reply was deleted at 2011-12-07 09:42:22 moderator
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up early is recommended , for the first time is recommended , very happy ~
Thank you for your support! ~
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The reply was deleted at the moderator 2011-12-07 09:48:32
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The reply was deleted at the moderator 2011-12-07 10:21:33
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have not tried the engine , the low-end . . .
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The reply was deleted at the moderator 2011-12-07 10:41:26
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The reply was deleted at 2011-12-07 11:03:01 moderator
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The reply was deleted at 2011-12-07 13:12:07 moderator
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Well, last November began to touch android, learning time in the middle for a long , finally made two App, the company has said to learn Win8, hard to force programmers. . .
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Thank you advice , personal little App years later , will try to use the
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The reply was deleted at the moderator 2011-12-07 14:57:52
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The reply was deleted at the moderator 2011-12-07 15:29:06
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severe agree - in fact, went to her room early in the morning thanked the
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The reply was deleted at the moderator 2011-12-08 08:59:44
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The reply was deleted at the moderator 2011-12-08 08:57:21
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The reply was deleted at the moderator 2011-12-08 08:53:16
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The reply was deleted at the moderator 2011-12-08 08:51:00
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The reply was deleted at the moderator 2011-12-08 08:49:54
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The reply was deleted at the moderator 2011-12-08 09:03:52
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The reply was deleted at the moderator 2011-12-08 09:05:39
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in fact, it is also a selfish , no moderator said so selfless . However, the fact App promotion does not matter, anyway , failure is no big deal .
Unfortunately, the future may also post a few in the Android area . Because of company policy , and now basically turning Win8 development , the current project is to make Win8 platform sharing tools . Android learned only two projects have made a transfer platform , very egg pain .
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Thank you , recently starting a new GLAXY S2 hardware resources to be provided for my amateur play android, huh. He still will do something with android gadgets .
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The reply was deleted at the moderator 2011-12-08 14:26:43
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The reply was deleted at the moderator 2011-12-08 15:16:12
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The reply was deleted at the moderator 2011-12-08 15:27:08
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The reply was deleted at the moderator 2011-12-08 16:42:05
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The reply was deleted at the moderator 2011-12-09 09:32:53
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Well, for this code have a problem?
or to join in words. . .
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The reply was deleted at the moderator 2011-12-09 13:03:39
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The reply was deleted at the moderator 2011-12-09 13:22:50
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The reply was deleted at the moderator 2011-12-09 13:32:51
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The reply was deleted at the moderator 2011-12-09 13:40:33
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The reply was deleted at the moderator 2011-12-12 09:30:21
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The reply was deleted at the moderator 2011-12-12 09:16:34
do not understand.