Android 事件分发

• 滑动最新单位像素getScaledTouchSlop

• 关于事件三大方法

  • dispatchTouchEvent
  • onInterceptTouchEvent 在ViewGroup dispatchTouchEvent内部会调用
  • onTouchEvent 在 dispatchTouchEvent内部会调用
  • onTouch

• 先看一下事件分发核心源代码，基本是 ViewGroup 事件分发的起点 dispatchTouchEvent 方法，方法中会调用到onInterceptTouchEvent 方法，询问是否需要自己拦截处理，也会间接调用到 onTouchEvent 方法，接下来一点点拆解关键地方。

  • @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        if (mInputEventConsistencyVerifier != null) {
            mInputEventConsistencyVerifier.onTouchEvent(ev, 1);
        }
    
        // If the event targets the accessibility focused view and this is it, start
        // normal event dispatch. Maybe a descendant is what will handle the click.
        if (ev.isTargetAccessibilityFocus() && isAccessibilityFocusedViewOrHost()) {
            ev.setTargetAccessibilityFocus(false);
        }
    
        boolean handled = false;
        if (onFilterTouchEventForSecurity(ev)) {
            final int action = ev.getAction();
            final int actionMasked = action & MotionEvent.ACTION_MASK;
    
            // Handle an initial down.
            if (actionMasked == MotionEvent.ACTION_DOWN) {
                // Throw away all previous state when starting a new touch gesture.
                // The framework may have dropped the up or cancel event for the previous gesture
                // due to an app switch, ANR, or some other state change.
                cancelAndClearTouchTargets(ev);
                resetTouchState();
            }
    
            // Check for interception.
            // 关键点1
            final boolean intercepted;
            if (actionMasked == MotionEvent.ACTION_DOWN
    || mFirstTouchTarget != null) {
                final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0;
                if (!disallowIntercept) {
                    intercepted = onInterceptTouchEvent(ev);
                    ev.setAction(action); // restore action in case it was changed
                } else {
                    intercepted = false;
                }
            } else {
                // There are no touch targets and this action is not an initial down
                // so this view group continues to intercept touches.
                intercepted = true;
            }
    
            // If intercepted, start normal event dispatch. Also if there is already
            // a view that is handling the gesture, do normal event dispatch.
            if (intercepted || mFirstTouchTarget != null) {
                ev.setTargetAccessibilityFocus(false);
            }
    
            // Check for cancelation.
            final boolean canceled = resetCancelNextUpFlag(this)
                    || actionMasked == MotionEvent.ACTION_CANCEL;
    
            // Update list of touch targets for pointer down, if needed.
            final boolean isMouseEvent = ev.getSource() == InputDevice.SOURCE_MOUSE;
            final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0
                    && !isMouseEvent;
            TouchTarget newTouchTarget = null;
            boolean alreadyDispatchedToNewTouchTarget = false;
            if (!canceled && !intercepted) {
                // If the event is targeting accessibility focus we give it to the
                // view that has accessibility focus and if it does not handle it
                // we clear the flag and dispatch the event to all children as usual.
                // We are looking up the accessibility focused host to avoid keeping
                // state since these events are very rare.
                View childWithAccessibilityFocus = ev.isTargetAccessibilityFocus()
                        ? findChildWithAccessibilityFocus() : null;
    
                if (actionMasked == MotionEvent.ACTION_DOWN
    || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN)
                        || actionMasked == MotionEvent.ACTION_HOVER_MOVE) {
                    final int actionIndex = ev.getActionIndex(); // always 0 for down
                    final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex)
                            : TouchTarget.ALL_POINTER_IDS;
    
                    // Clean up earlier touch targets for this pointer id in case they
                    // have become out of sync.
                    removePointersFromTouchTargets(idBitsToAssign);
    
                    final int childrenCount = mChildrenCount;
                    if (newTouchTarget == null && childrenCount != 0) {
                        final float x = ev.getXDispatchLocation(actionIndex);
                        final float y = ev.getYDispatchLocation(actionIndex);
                        // Find a child that can receive the event.
                        // Scan children from front to back.
                        final ArrayList<View> preorderedList = buildTouchDispatchChildList();
                        final boolean customOrder = preorderedList == null
                                && isChildrenDrawingOrderEnabled();
                        final View[] children = mChildren;
                        for (int i = childrenCount - 1; i >= 0; i--) {
                            final int childIndex = getAndVerifyPreorderedIndex(
                                    childrenCount, i, customOrder);
                            final View child = getAndVerifyPreorderedView(
                                    preorderedList, children, childIndex);
    
                            // If there is a view that has accessibility focus we want it
                            // to get the event first and if not handled we will perform a
                            // normal dispatch. We may do a double iteration but this is
                            // safer given the timeframe.
                            if (childWithAccessibilityFocus != null) {
                                if (childWithAccessibilityFocus != child) {
                                    continue;
                                }
                                childWithAccessibilityFocus = null;
                                i = childrenCount;
                            }
    
                            if (!child.canReceivePointerEvents()
                                    || !isTransformedTouchPointInView(x, y, child, null)) {
                                ev.setTargetAccessibilityFocus(false);
                                continue;
                            }
    
                            newTouchTarget = getTouchTarget(child);
                            if (newTouchTarget != null) {
                                // Child is already receiving touch within its bounds.
                                // Give it the new pointer in addition to the ones it is handling.
                                newTouchTarget.pointerIdBits |= idBitsToAssign;
                                break;
                            }
    
                            resetCancelNextUpFlag(child);
                            // 关键点2
                            if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) {
                                // Child wants to receive touch within its bounds.
                                mLastTouchDownTime = ev.getDownTime();
                                if (preorderedList != null) {
                                    // childIndex points into presorted list, find original index
                                    for (int j = 0; j < childrenCount; j++) {
                                        if (children[childIndex] == mChildren[j]) {
                                            mLastTouchDownIndex = j;
                                            break;
                                        }
                                    }
                                } else {
                                    mLastTouchDownIndex = childIndex;
                                }
                                mLastTouchDownX = x;
                                mLastTouchDownY = y;
                                // 关键点3
                                newTouchTarget = addTouchTarget(child, idBitsToAssign);
                                alreadyDispatchedToNewTouchTarget = true;
                                break;
                            }
    
                            // The accessibility focus didn't handle the event, so clear
                            // the flag and do a normal dispatch to all children.
                            ev.setTargetAccessibilityFocus(false);
                        }
                        if (preorderedList != null) preorderedList.clear();
                    }
    
                    if (newTouchTarget == null && mFirstTouchTarget != null) {
                        // Did not find a child to receive the event.
                        // Assign the pointer to the least recently added target.
                        newTouchTarget = mFirstTouchTarget;
                        while (newTouchTarget.next != null) {
                            newTouchTarget = newTouchTarget.next;
                        }
                        newTouchTarget.pointerIdBits |= idBitsToAssign;
                    }
                }
            }
    
            // Dispatch to touch targets.
            if (mFirstTouchTarget == null) {
                // No touch targets so treat this as an ordinary view.
                handled = dispatchTransformedTouchEvent(ev, canceled, null,
                        TouchTarget.ALL_POINTER_IDS);
            } else {
                // Dispatch to touch targets, excluding the new touch target if we already
                // dispatched to it.  Cancel touch targets if necessary.
                TouchTarget predecessor = null;
                TouchTarget target = mFirstTouchTarget;
                while (target != null) {
                    final TouchTarget next = target.next;
                    if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) {
                        handled = true;
                    } else {
                        final boolean cancelChild = resetCancelNextUpFlag(target.child)
                                || intercepted;
                        if (dispatchTransformedTouchEvent(ev, cancelChild,
                                target.child, target.pointerIdBits)) {
                            handled = true;
                        }
                        if (cancelChild) {
                            if (predecessor == null) {
                                mFirstTouchTarget = next;
                            } else {
                                predecessor.next = next;
                            }
                            target.recycle();
                            target = next;
                            continue;
                        }
                    }
                    predecessor = target;
                    target = next;
                }
            }
    
            // Update list of touch targets for pointer up or cancel, if needed.
            if (canceled
                    || actionMasked == MotionEvent.ACTION_UP
    || actionMasked == MotionEvent.ACTION_HOVER_MOVE) {
                resetTouchState();
            } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) {
                final int actionIndex = ev.getActionIndex();
                final int idBitsToRemove = 1 << ev.getPointerId(actionIndex);
                removePointersFromTouchTargets(idBitsToRemove);
            }
        }
    
        if (!handled && mInputEventConsistencyVerifier != null) {
            mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1);
        }
        return handled;
    }
    

• 在 ViewGroup 中询问是否需要拦截，ViewGroup 具备优先处理事件权利，需要自己处理，就可以直接拦截掉

  • // Check for interception.
    final boolean intercepted;
    if (actionMasked == MotionEvent.ACTION_DOWN
    || mFirstTouchTarget != null) {
        final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0;
        if (!disallowIntercept) {
            intercepted = onInterceptTouchEvent(ev);
            ev.setAction(action); // restore action in case it was changed
        } else {
            intercepted = false;
        }
    } else {
        // There are no touch targets and this action is not an initial down
        // so this view group continues to intercept touches.
        intercepted = true;
    }
    

如果想拦截就直接重载 onInterceptTouchEvent 方法，事件就不会继续

public boolean onInterceptTouchEvent(MotionEvent ev) {
    if (ev.isFromSource(InputDevice.SOURCE_MOUSE)
            && ev.getAction() == MotionEvent.ACTION_DOWN
&& ev.isButtonPressed(MotionEvent.BUTTON_PRIMARY)
            && isOnScrollbarThumb(ev.getXDispatchLocation(0), ev.getYDispatchLocation(0))) {
        return true;
    }
    return false;
}

  拦截掉后，就不会循环询问子 View 逻辑了 ，跳过下面查找逻辑，查找逻辑无非就找到一个匹配消费事件的 TouchTarget 一般只有在 ACTION_DOWN 的情况下，才会查找，ACTION_UP，ACTION_MOVE 不会查找

if (!canceled && !intercepted) {
}

  mFirstTouchTarget = null 调用 dispatchTransformedTouchEvent 方法最后直接走 View 分发逻辑 super.dispatchTouchEvent(event) ，在 View dispatchTouchEvent 方法中，最终调用回 ViewGroup onTouchEvent 方法

// Dispatch to touch targets.
if (mFirstTouchTarget == null) {
    // No touch targets so treat this as an ordinary view.
    handled = dispatchTransformedTouchEvent(ev, canceled, null,
            TouchTarget.ALL_POINTER_IDS);
}

if (child == null) {
    handled = super.dispatchTouchEvent(event);
}

• 刚讲到的是关于 ViewGroup 拦截掉事件的情况，接下来分析不拦截的情况，不拦截其实就是分发到下面的子View 处理，关于分发到哪个子 View 会有一个循环查找的逻辑，外层是循环遍历子View，isTransformedTouchPointInView方法主要是看点击区域是否在该子View区域内，dispatchTransformedTouchEvent方法是调用子View分发逻辑，看看该子View是否消费

  • if (actionMasked == MotionEvent.ACTION_DOWN
    || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN)
            || actionMasked == MotionEvent.ACTION_HOVER_MOVE) {
        final int actionIndex = ev.getActionIndex(); // always 0 for down
        final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex)
                : TouchTarget.ALL_POINTER_IDS;
    
        // Clean up earlier touch targets for this pointer id in case they
        // have become out of sync.
        removePointersFromTouchTargets(idBitsToAssign);
    
        final int childrenCount = mChildrenCount;
        if (newTouchTarget == null && childrenCount != 0) {
            final float x = ev.getXDispatchLocation(actionIndex);
            final float y = ev.getYDispatchLocation(actionIndex);
            // Find a child that can receive the event.
            // Scan children from front to back.
            final ArrayList<View> preorderedList = buildTouchDispatchChildList();
            final boolean customOrder = preorderedList == null
                    && isChildrenDrawingOrderEnabled();
            final View[] children = mChildren;
            for (int i = childrenCount - 1; i >= 0; i--) {
                final int childIndex = getAndVerifyPreorderedIndex(
                        childrenCount, i, customOrder);
                final View child = getAndVerifyPreorderedView(
                        preorderedList, children, childIndex);
    
                // If there is a view that has accessibility focus we want it
                // to get the event first and if not handled we will perform a
                // normal dispatch. We may do a double iteration but this is
                // safer given the timeframe.
                if (childWithAccessibilityFocus != null) {
                    if (childWithAccessibilityFocus != child) {
                        continue;
                    }
                    childWithAccessibilityFocus = null;
                    i = childrenCount;
                }
    
                if (!child.canReceivePointerEvents()
                        || !isTransformedTouchPointInView(x, y, child, null)) {
                    ev.setTargetAccessibilityFocus(false);
                    continue;
                }
    
                newTouchTarget = getTouchTarget(child);
                if (newTouchTarget != null) {
                    // Child is already receiving touch within its bounds.
                    // Give it the new pointer in addition to the ones it is handling.
                    newTouchTarget.pointerIdBits |= idBitsToAssign;
                    break;
                }
    
                resetCancelNextUpFlag(child);
                if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) {
                    // Child wants to receive touch within its bounds.
                    mLastTouchDownTime = ev.getDownTime();
                    if (preorderedList != null) {
                        // childIndex points into presorted list, find original index
                        for (int j = 0; j < childrenCount; j++) {
                            if (children[childIndex] == mChildren[j]) {
                                mLastTouchDownIndex = j;
                                break;
                            }
                        }
                    } else {
                        mLastTouchDownIndex = childIndex;
                    }
                    mLastTouchDownX = x;
                    mLastTouchDownY = y;
                    newTouchTarget = addTouchTarget(child, idBitsToAssign);
                    alreadyDispatchedToNewTouchTarget = true;
                    break;
                }
    
                // The accessibility focus didn't handle the event, so clear
                // the flag and do a normal dispatch to all children.
                ev.setTargetAccessibilityFocus(false);
            }
            if (preorderedList != null) preorderedList.clear();
        }
    
        if (newTouchTarget == null && mFirstTouchTarget != null) {
            // Did not find a child to receive the event.
            // Assign the pointer to the least recently added target.
            newTouchTarget = mFirstTouchTarget;
            while (newTouchTarget.next != null) {
                newTouchTarget = newTouchTarget.next;
            }
            newTouchTarget.pointerIdBits |= idBitsToAssign;
        }
    }
    

  •   dispatchTransformedTouchEvent 方法中 如果child不为空，就调用子View分发逻辑 child.dispatchTouchEvent(event)，找到合适的子View之后，会存储下TouchTarget一个单向链表，当所有子View都不消费的时候，还是会继续回到这个方法，ViewGroup自己调用会View分发逻辑，最后闭环。

  • private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel,
            View child, int desiredPointerIdBits) {
        final boolean handled;
    
        // Canceling motions is a special case.  We don't need to perform any transformations
        // or filtering.  The important part is the action, not the contents.
        final int oldAction = event.getAction();
        if (cancel || oldAction == MotionEvent.ACTION_CANCEL) {
            event.setAction(MotionEvent.ACTION_CANCEL);
            if (child == null) {
                handled = super.dispatchTouchEvent(event);
            } else {
                handled = child.dispatchTouchEvent(event);
                
            }
            event.setAction(oldAction);
            return handled;
        }
    
        // Calculate the number of pointers to deliver.
        final int oldPointerIdBits = event.getPointerIdBits();
        final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits;
    
        // If for some reason we ended up in an inconsistent state where it looks like we
        // might produce a motion event with no pointers in it, then drop the event.
        if (newPointerIdBits == 0) {
            return false;
        }
    
        // If the number of pointers is the same and we don't need to perform any fancy
        // irreversible transformations, then we can reuse the motion event for this
        // dispatch as long as we are careful to revert any changes we make.
        // Otherwise we need to make a copy.
        final MotionEvent transformedEvent;
        if (newPointerIdBits == oldPointerIdBits) {
            if (child == null || child.hasIdentityMatrix()) {
                if (child == null) {
                    handled = super.dispatchTouchEvent(event);
                } else {
                    final float offsetX = mScrollX - child.mLeft;
                    final float offsetY = mScrollY - child.mTop;
                    event.offsetLocation(offsetX, offsetY);
    
                    handled = child.dispatchTouchEvent(event);
    
                    event.offsetLocation(-offsetX, -offsetY);
                }
                return handled;
            }
            transformedEvent = MotionEvent.obtain(event);
        } else {
            transformedEvent = event.split(newPointerIdBits);
        }
    
        // Perform any necessary transformations and dispatch.
        if (child == null) {
            handled = super.dispatchTouchEvent(transformedEvent);
        } else {
            final float offsetX = mScrollX - child.mLeft;
            final float offsetY = mScrollY - child.mTop;
            transformedEvent.offsetLocation(offsetX, offsetY);
            if (! child.hasIdentityMatrix()) {
                transformedEvent.transform(child.getInverseMatrix());
            }
    
            handled = child.dispatchTouchEvent(transformedEvent);
        }
    
        // Done.
        transformedEvent.recycle();
        return handled;
    }
    

• 当ACTION_DOWN的时候，如果找到了一个合适消费子View，会存储到一个TouchTarget链表中，事件是一系列执行的，连续的，ACTION_MOVE，ACTION_UP，会直接跳过查找逻辑了，直接分发事件dispatchTransformedTouchEvent，alreadyDispatchedToNewTouchTarget变量只有ACTION_DOWN，并且第一次找到子View，才会等于true

  • final TouchTarget next = target.next;
    if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) {
        handled = true;
    } else {
        final boolean cancelChild = resetCancelNextUpFlag(target.child)
                || intercepted;
        if (dispatchTransformedTouchEvent(ev, cancelChild,
                target.child, target.pointerIdBits)) {
            handled = true;
        }
        if (cancelChild) {
            if (predecessor == null) {
                mFirstTouchTarget = next;
            } else {
                predecessor.next = next;
            }
            target.recycle();
            target = next;
            continue;
        }
    }
    

• 再来看看onTouchEvent方法，该方法是由dispatchTouchEvent方法调用，其中如果View是*CLICKABLE，LONG_CLICKABLE，CONTEXT_CLICKABLE默认是可以消费事件的。否则不会消费事件，比如但是当一个ViewGroup* ，被调用*setOnClickListener之后，它会修改成功CLICKABLE*

  • public void setOnClickListener(@Nullable OnClickListener l) {
        if (!isClickable()) {
            setClickable(true);
        }
        getListenerInfo().mOnClickListener = l;
    }
    

  • public boolean onTouchEvent(MotionEvent event) {
        final float x = event.getX();
        final float y = event.getY();
        final int viewFlags = mViewFlags;
        final int action = event.getAction();
    
        final boolean clickable = ((viewFlags & CLICKABLE) == CLICKABLE
    || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)
                || (viewFlags & CONTEXT_CLICKABLE) == CONTEXT_CLICKABLE;
    
        if ((viewFlags & ENABLED_MASK) == DISABLED
    && (mPrivateFlags4 & PFLAG4_ALLOW_CLICK_WHEN_DISABLED) == 0) {
            if (action == MotionEvent.ACTION_UP && (mPrivateFlags & PFLAG_PRESSED) != 0) {
                setPressed(false);
            }
            mPrivateFlags3 &= ~PFLAG3_FINGER_DOWN;
            // A disabled view that is clickable still consumes the touch
            // events, it just doesn't respond to them.
            return clickable;
        }
        if (mTouchDelegate != null) {
            if (mTouchDelegate.onTouchEvent(event)) {
                return true;
            }
        }
    
        if (clickable || (viewFlags & TOOLTIP) == TOOLTIP) {
            switch (action) {
                case MotionEvent.ACTION_UP:
                    mPrivateFlags3 &= ~PFLAG3_FINGER_DOWN;
                    if ((viewFlags & TOOLTIP) == TOOLTIP) {
                        handleTooltipUp();
                    }
                    if (!clickable) {
                        removeTapCallback();
                        removeLongPressCallback();
                        mInContextButtonPress = false;
                        mHasPerformedLongPress = false;
                        mIgnoreNextUpEvent = false;
                        break;
                    }
                    boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0;
                    if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) {
                        // take focus if we don't have it already and we should in
                        // touch mode.
                        boolean focusTaken = false;
                        if (isFocusable() && isFocusableInTouchMode() && !isFocused()) {
                            focusTaken = requestFocus();
                        }
    
                        if (prepressed) {
                            // The button is being released before we actually
                            // showed it as pressed.  Make it show the pressed
                            // state now (before scheduling the click) to ensure
                            // the user sees it.
                            setPressed(true, x, y);
                        }
    
                        if (!mHasPerformedLongPress && !mIgnoreNextUpEvent) {
                            // This is a tap, so remove the longpress check
                            removeLongPressCallback();
    
                            // Only perform take click actions if we were in the pressed state
                            if (!focusTaken) {
                                // Use a Runnable and post this rather than calling
                                // performClick directly. This lets other visual state
                                // of the view update before click actions start.
                                if (mPerformClick == null) {
                                    mPerformClick = new PerformClick();
                                }
                                if (!post(mPerformClick)) {
                                    performClickInternal();
                                }
                            }
                        }
    
                        if (mUnsetPressedState == null) {
                            mUnsetPressedState = new UnsetPressedState();
                        }
    
                        if (prepressed) {
                            postDelayed(mUnsetPressedState,
                                    ViewConfiguration.getPressedStateDuration());
                        } else if (!post(mUnsetPressedState)) {
                            // If the post failed, unpress right now
                            mUnsetPressedState.run();
                        }
    
                        removeTapCallback();
                    }
                    mIgnoreNextUpEvent = false;
                    break;
    
                case MotionEvent.ACTION_DOWN:
                    if (event.getSource() == InputDevice.SOURCE_TOUCHSCREEN) {
                        mPrivateFlags3 |= PFLAG3_FINGER_DOWN;
                    }
                    mHasPerformedLongPress = false;
    
                    if (!clickable) {
                        checkForLongClick(
                                ViewConfiguration.getLongPressTimeout(),
                                x,
                                y,
                                TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__LONG_PRESS);
                        break;
                    }
    
                    if (performButtonActionOnTouchDown(event)) {
                        break;
                    }
    
                    // Walk up the hierarchy to determine if we're inside a scrolling container.
                    boolean isInScrollingContainer = isInScrollingContainer();
    
                    // For views inside a scrolling container, delay the pressed feedback for
                    // a short period in case this is a scroll.
                    if (isInScrollingContainer) {
                        mPrivateFlags |= PFLAG_PREPRESSED;
                        if (mPendingCheckForTap == null) {
                            mPendingCheckForTap = new CheckForTap();
                        }
                        mPendingCheckForTap.x = event.getX();
                        mPendingCheckForTap.y = event.getY();
                        postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout());
                    } else {
                        // Not inside a scrolling container, so show the feedback right away
                        setPressed(true, x, y);
                        checkForLongClick(
                                ViewConfiguration.getLongPressTimeout(),
                                x,
                                y,
                                TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__LONG_PRESS);
                    }
                    break;
    
                case MotionEvent.ACTION_CANCEL:
                    if (clickable) {
                        setPressed(false);
                    }
                    removeTapCallback();
                    removeLongPressCallback();
                    mInContextButtonPress = false;
                    mHasPerformedLongPress = false;
                    mIgnoreNextUpEvent = false;
                    mPrivateFlags3 &= ~PFLAG3_FINGER_DOWN;
                    break;
    
                case MotionEvent.ACTION_MOVE:
                    if (clickable) {
                        drawableHotspotChanged(x, y);
                    }
    
                    final int motionClassification = event.getClassification();
                    final boolean ambiguousGesture =
                            motionClassification == MotionEvent.CLASSIFICATION_AMBIGUOUS_GESTURE;
                    int touchSlop = mTouchSlop;
                    if (ambiguousGesture && hasPendingLongPressCallback()) {
                        if (!pointInView(x, y, touchSlop)) {
                            // The default action here is to cancel long press. But instead, we
                            // just extend the timeout here, in case the classification
                            // stays ambiguous.
                            removeLongPressCallback();
                            long delay = (long) (ViewConfiguration.getLongPressTimeout()
                                    * mAmbiguousGestureMultiplier);
                            // Subtract the time already spent
                            delay -= event.getEventTime() - event.getDownTime();
                            checkForLongClick(
                                    delay,
                                    x,
                                    y,
                                    TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__LONG_PRESS);
                        }
                        touchSlop *= mAmbiguousGestureMultiplier;
                    }
    
                    // Be lenient about moving outside of buttons
                    if (!pointInView(x, y, touchSlop)) {
                        // Outside button
                        // Remove any future long press/tap checks
                        removeTapCallback();
                        removeLongPressCallback();
                        if ((mPrivateFlags & PFLAG_PRESSED) != 0) {
                            setPressed(false);
                        }
                        mPrivateFlags3 &= ~PFLAG3_FINGER_DOWN;
                    }
    
                    final boolean deepPress =
                            motionClassification == MotionEvent.CLASSIFICATION_DEEP_PRESS;
                    if (deepPress && hasPendingLongPressCallback()) {
                        // process the long click action immediately
                        removeLongPressCallback();
                        checkForLongClick(
                                0 /* send immediately */,
                                x,
                                y,
                                TOUCH_GESTURE_CLASSIFIED__CLASSIFICATION__DEEP_PRESS);
                    }
    
                    break;
            }
    
            return true;
        }
    
        return false;
    }
    

• View 中onTouch 优先级高于 onTouchEvent，如果onTouch消费了，就不会走onTouchEvent方法

  • if (onFilterTouchEventForSecurity(event)) {
        if ((mViewFlags & ENABLED_MASK) == ENABLED && handleScrollBarDragging(event)) {
            result = true;
        }
        //noinspection SimplifiableIfStatement
        ListenerInfo li = mListenerInfo;
        if (li != null && li.mOnTouchListener != null
                && (mViewFlags & ENABLED_MASK) == ENABLED
    && li.mOnTouchListener.onTouch(this, event)) {
            result = true;
        }
    
        if (!result && onTouchEvent(event)) {
            result = true;
        }
    }
    

• 当ACTION_UP事件发生时，会触发performClick方法

  • if (!mHasPerformedLongPress && !mIgnoreNextUpEvent) {
        // This is a tap, so remove the longpress check
        removeLongPressCallback();
    
        // Only perform take click actions if we were in the pressed state
        if (!focusTaken) {
            // Use a Runnable and post this rather than calling
            // performClick directly. This lets other visual state
            // of the view update before click actions start.
            if (mPerformClick == null) {
                mPerformClick = new PerformClick();
            }
            if (!post(mPerformClick)) {
                performClickInternal();
            }
        }
    }
    

• View 源码中有大量位运算符

& 运算 如果两个操作数的对应位都为1，则结果位为1；否则，结果位为0

int a = 9;    // 二进制表示为 1001
int b = 5;    // 二进制表示为 0101
int result = a & b;    // 二进制结果为 0001，十进制结果为 1
System.out.println(result);    // 输出: 1

|运算 对两个二进制数的每一位进行逻辑或运算，结果为1的位只需要两个数的对应位中有一个为1即可

int a = 5;    // 二进制表示为 0101
int b = 3;    // 二进制表示为 0011
int c = a | c;  // 二进制结果为 0111，十进制结果为：7
System.out.println(result);    // 输出: 7

• 事件流转都是从父 ViewGroup 开始，优先父 View 考虑是否消费，默认是不消费的，不消费再继续循环查找子 View 是否要消费，子View 不消费，会继续回到父 View
• 事件只有在第一次ACTION_DOWN 的时候才会去查找子View是否要消费，找到后会放入到一个TouchTarget 链表中存储起来，在ACTION_MOVE的时候，直接处理。