通过canViewReceivePointerEvents判断子View是否能够接收到点击事件。必须符合2种情况，缺一不可：1、点击事件的坐标落在在子View的区域内；2、子View没有正在播放动画。满足条件后，调用dispatchTransformedTouchEvent，其实也是调用子View的dispatchTouchEvent。
private static boolean canViewReceivePointerEvents(@NonNull View child) { return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null; } protected boolean isTransformedTouchPointInView(float x, float y, View child, PointF outLocalPoint) { final float[] point = getTempPoint(); point[0] = x; point[1] = y; transformPointToViewLocal(point, child); final boolean isInView = child.pointInView(point[0], point[1]); if (isInView && outLocalPoint != null) { outLocalPoint.set(point[0], point[1]); } return isInView; } private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, View child, int desiredPointerIdBits) { final boolean handled; 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; } ... // 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dispatchTransformedTouchEvent返回true时，结束for循环遍历，赋值newTouchTarget，相当于发现了可以接收事件的View，不用再继续找了。
newTouchTarget = addTouchTarget(child, idBitsToAssign); alreadyDispatchedToNewTouchTarget = true; break;在addTouchTarget方法赋值mFirstTouchTarget。
private TouchTarget addTouchTarget(@NonNull View child, int pointerIdBits) { final TouchTarget target = TouchTarget.obtain(child, pointerIdBits); target.next = mFirstTouchTarget; mFirstTouchTarget = target; return target; } 3.2.2 ViewGroup自己处理事件另一种情况是mFirstTouchTarget为空时，ViewGroup自己处理事件，这里注意第三个参数为null，ViewGroup的super.dispatchTouchEvent将调用View的dispatchTouchEvent。
if (mFirstTouchTarget == null) { // No touch targets so treat this as an ordinary view. handled = dispatchTransformedTouchEvent(ev, canceled, null, TouchTarget.ALL_POINTER_IDS); } 3.3 View处理点击事件的过程View的dispatchTouchEvent是怎么处理事件的呢？
public boolean dispatchTouchEvent(MotionEvent event) { boolean result = false; ... 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; } } ... return result; }
首先使用onFilterTouchEventForSecurity方法过滤不符合应用安全策略的触摸事件。
public boolean onFilterTouchEventForSecurity(MotionEvent event) { //noinspection RedundantIfStatement if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { // Window is obscured, drop this touch. return false; } return true; }mOnTouchListener != null判断是否设置了OnTouchEvent，设置了就执行mOnTouchListener.onTouch并返回true,不再执行onTouchEvent。这里得出OnTouchEvent的优先级高于OnTouchEvent，便于使用setOnTouchListener设置处理点击事件。
另一种情况是进入onTouchEvent进行处理。
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) { 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; } ... }当View不可用时，依然会处理事件，只是看起来不可用。
接着执行mTouchDelegate.onTouchEvent
if (mTouchDelegate != null) { if (mTouchDelegate.onTouchEvent(event)) { return true; } }