View的onAttachedToWindow引发的图片轮播问题探究

//View.java
void dispatchAttachedToWindow(AttachInfo info, int visibility) {
    mAttachInfo = info;
    /****部分代码省略*****/
    // Transfer all pending runnables.
    if (mRunQueue != null) {
        mRunQueue.executeActions(info.mHandler);
        mRunQueue = null;
    }
    performCollectViewAttributes(mAttachInfo, visibility);
    onAttachedToWindow();
    /****部分代码省略*****/
}
public boolean postDelayed(Runnable action, long delayMillis) {
    final AttachInfo attachInfo = mAttachInfo;
    if (attachInfo != null) {
        return attachInfo.mHandler.postDelayed(action, delayMillis);
    }
    // Postpone the runnable until we know on which thread it needs to run.
    // Assume that the runnable will be successfully placed after attach.
    getRunQueue().postDelayed(action, delayMillis);
    return true;
}
public boolean post(Runnable action) {
    final AttachInfo attachInfo = mAttachInfo;
    if (attachInfo != null) {
        return attachInfo.mHandler.post(action);
    }
    // Postpone the runnable until we know on which thread it needs to run.
    // Assume that the runnable will be successfully placed after attach.
    getRunQueue().post(action);
    return true;
}
public boolean removeCallbacks(Runnable action) {
    if (action != null) {
        final AttachInfo attachInfo = mAttachInfo;
        if (attachInfo != null) {
            attachInfo.mHandler.removeCallbacks(action);
            attachInfo.mViewRootImpl.mChoreographer.removeCallbacks(
                  Choreographer.CALLBACK_ANIMATION, action, null);
        }
        getRunQueue().removeCallbacks(action);
    }
    return true;
}

public class HandlerActionQueue {
    public void removeCallbacks(Runnable action) {
        synchronized (this) {
            final int count = mCount;
            int j = 0;
            final HandlerAction[] actions = mActions;
            for (int i = 0; i < count; i++) {
                if (actions[i].matches(action)) {
                    // Remove this action by overwriting it within
                    // this loop or nulling it out later.
                    continue;
                }
                if (j != i) {
                    // At least one previous entry was removed, so
                    // this one needs to move to the "new" list.
                    actions[j] = actions[i];
                }
                j++;
            }
            // The "new" list only has j entries.
            mCount = j;
            // Null out any remaining entries.
            for (; j < count; j++) {
                actions[j] = null;
            }
        }
    }
}

public class RecyclerView extends ViewGroup implements ScrollingView, NestedScrollingChild2 {
    /***部分代码省略***/
    private void initChildrenHelper() {
        this.mChildHelper = new ChildHelper(new Callback() {
            public int getChildCount() {
                return RecyclerView.this.getChildCount();
            }

            public void addView(View child, int index) {
                RecyclerView.this.addView(child, index);
                RecyclerView.this.dispatchChildAttached(child);
            }

            public int indexOfChild(View view) {
                return RecyclerView.this.indexOfChild(view);
            }

            public void removeViewAt(int index) {
                View child = RecyclerView.this.getChildAt(index);
                if (child != null) {
                    RecyclerView.this.dispatchChildDetached(child);
                    child.clearAnimation();
                }

                RecyclerView.this.removeViewAt(index);
            }
        }
        /***部分代码省略***/
    }
    /***部分代码省略***/
}