仔细看下就可以发现，只要onTouchEvent()有一次返回true，那么不管之后的返回是不是true都会继续进入onTouchEvent()，而不会向下分发。
补充
- 进入 View 的 onTouch 之前会先判断是否有设置 TouchListener，有则直接调用 TouchListener 的 onTouch
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;
}
- ViewGroup 如果被设置成 disallowIntercept 则不会进入 onInterceptTouchEvent
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;
}
- 但是在此之前还有段代码，如果是 ACTION_DOWN 则会移除 disallowIntercept 的标志，这就代表每次 ACTION_DOWN 都必定进入 onInterceptTouchEvent
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();
}
private void resetTouchState() {
clearTouchTargets();
resetCancelNextUpFlag(this);
mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT;
mNestedScrollAxes = SCROLL_AXIS_NONE;
}
