dispatchTouchEvent sample of a ViewGroup in the Android framework.

ViewGroup_dispatchTouchEvent.java

// Complete source code:
// https://github.com/android/platform_frameworks_base/blob/master/core/java/android/view/ViewGroup.java#L2143-L2357
public boolean dispatchTouchEvent(MotionEvent ev) {
    boolean handled = false;

    // Ignore ...
  
    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;
    }

    // Ignore ...

    // Check for cancelation.
    final boolean canceled = resetCancelNextUpFlag(this)
            || actionMasked == MotionEvent.ACTION_CANCEL;
    if (!canceled && !intercepted) {
        
        // Ignore ...
        
        for (int i = childrenCount - 1; i >= 0; i--) {
            final int childIndex = getAndVerifyPreorderedIndex(
                    childrenCount, i, customOrder);
            final View child = getAndVerifyPreorderedView(
                    preorderedList, children, childIndex);

            resetCancelNextUpFlag(child);
            // dispatchTransformedTouchEvent will call dispatchTouchEvent
            if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) {
                // Child wants to receive touch within its bounds.

                // Ignore ...

                break;
            }
        }
    }
    
    // Ignore ...
    
    return handled;
}