private void findScrollableView(View content, RefreshKernel kernel) {
    mScrollableView = findScrollableViewInternal(content, true);
    try {
        if (mScrollableView instanceof CoordinatorLayout) {
            kernel.getRefreshLayout().setNestedScrollingEnabled(false);
            wrapperCoordinatorLayout(((CoordinatorLayout) mScrollableView), kernel.getRefreshLayout());
        }
    } catch (Throwable e) {//try 不能删除
    }
    if (mScrollableView instanceof NestedScrollingParent
            && !(mScrollableView instanceof NestedScrollingChild)) {
        mScrollableView = findScrollableViewInternal(mScrollableView, false);
    }
    if (mScrollableView instanceof ViewPager) {
        wrapperViewPager((ViewPager) this.mScrollableView);
    }
    if (mScrollableView == null) {
        mScrollableView = content;
    }
}
 

private View findScrollableViewInternal(View content, boolean selfable) {
    View scrollableView = null;
    Queue<View> views = new LinkedBlockingQueue<>(Collections.singletonList(content));
    while (!views.isEmpty() && scrollableView == null) {
        View view = views.poll();
        if (view != null) {
            if ((selfable || view != content) && (view instanceof AbsListView
                    || view instanceof ScrollView
                    || view instanceof ScrollingView
                    || view instanceof NestedScrollingChild
                    || view instanceof NestedScrollingParent
                    || view instanceof WebView
                    || view instanceof ViewPager)) {
                scrollableView = view;
            } else if (view instanceof ViewGroup) {
                ViewGroup group = (ViewGroup) view;
                for (int j = 0; j < group.getChildCount(); j++) {
                    views.add(group.getChildAt(j));
                }
            }
        }
    }
    return scrollableView;
}
 

@Override
public void setPrimaryItem(ViewGroup container, int position, Object object) {
    super.setPrimaryItem(container, position, object);
    if (object instanceof View) {
        mScrollableView = ((View) object);
    } else if (object instanceof Fragment) {
        mScrollableView = ((Fragment) object).getView();
    }
    if (mScrollableView != null) {
        mScrollableView = findScrollableViewInternal(mScrollableView, true);
        if (mScrollableView instanceof NestedScrollingParent
                && !(mScrollableView instanceof NestedScrollingChild)) {
            mScrollableView = findScrollableViewInternal(mScrollableView, false);
        }
    }
}
 

@Override
protected void onFinishInflate() {
    super.onFinishInflate();
    if (getChildCount() > 1) {
        throw new IllegalStateException("QRefreshLayout can only have one child");
    }
    mTarget = getChildAt(0);
    mTarget.setClickable(true);
    boolean targetNestedScrollingEnabled = false;
    if (mTarget instanceof NestedScrollingChild) {
        targetNestedScrollingEnabled = ((NestedScrollingChild) mTarget).isNestedScrollingEnabled();
    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        targetNestedScrollingEnabled = mTarget.isNestedScrollingEnabled();
    }
    setNestedScrollingEnabled(targetNestedScrollingEnabled);
    ViewGroup.LayoutParams params = mTarget.getLayoutParams();
    params.width = LayoutParams.MATCH_PARENT;
    params.height = LayoutParams.MATCH_PARENT;
    mTarget.setLayoutParams(params);
    if (mHeaderView == null) {
        setHeaderView(new HeaderView(getContext()));
    }
    if (mFooterView == null) {
        setFooterView(new FooterView(getContext()));
    }
}
 

private View findScrollingChild(View view) {
    if (view instanceof NestedScrollingChild) {
        return view;
    }
    if (view instanceof ViewGroup) {
        ViewGroup group = (ViewGroup) view;
        for (int i = 0, count = group.getChildCount(); i < count; i++) {
            View scrollingChild = findScrollingChild(group.getChildAt(i));
            if (scrollingChild != null) {
                return scrollingChild;
            }
        }
    }
    return null;
}
 

private View findScrollingChild(View view) {
    if (view instanceof NestedScrollingChild) {
        return view;
    }
    if (view instanceof ViewGroup) {
        ViewGroup group = (ViewGroup) view;
        for (int i = 0, count = group.getChildCount(); i < count; i++) {
            View scrollingChild = findScrollingChild(group.getChildAt(i));
            if (scrollingChild != null) {
                return scrollingChild;
            }
        }
    }
    return null;
}
 

private View findScrollingChild(View view) {
    if (view instanceof NestedScrollingChild) {
        return view;
    }
    if (view instanceof ViewGroup) {
        ViewGroup group = (ViewGroup) view;
        for (int i = 0, count = group.getChildCount(); i < count; i++) {
            View scrollingChild = findScrollingChild(group.getChildAt(i));
            if (scrollingChild != null) {
                return scrollingChild;
            }
        }
    }
    return null;
}
 

private View findScrollingChild(View view) {
  if (view instanceof NestedScrollingChild) {
    return view;
  }
  if (view instanceof ViewGroup) {
    ViewGroup group = (ViewGroup) view;
    for (int i = 0, count = group.getChildCount(); i < count; i++) {
      View scrollingChild = findScrollingChild(group.getChildAt(i));
      if (scrollingChild != null) {
        return scrollingChild;
      }
    }
  }
  return null;
}
 

private View findScrollingChild(View view) {
    if (view instanceof NestedScrollingChild) {
        return view;
    }
    if (view instanceof ViewGroup) {
        ViewGroup group = (ViewGroup) view;
        for (int i = 0, count = group.getChildCount(); i < count; i++) {
            View scrollingChild = findScrollingChild(group.getChildAt(i));
            if (scrollingChild != null) {
                return scrollingChild;
            }
        }
    }
    return null;
}
 

/**
 * 通过id得到相应的view
 */
@Override
protected void onFinishInflate()
{
    final int childCount = getChildCount();

    if (childCount > 0)
    {
        mRefreshView = findViewById(com.lib.ptrview.R.id.common_ptrview_refresh_view);
        mContentView = findViewById(com.lib.ptrview.R.id.common_ptrview_content);
        mLoadMoreView = findViewById(com.lib.ptrview.R.id.common_ptrview_loadmore_view);
        mScrollContentView = findViewById(com.lib.ptrview.R.id.common_ptrview_content_scroll);
    }

    if (mContentView == null)
    {
        throw new IllegalStateException("CommonPtrLayout: mContentView is null");
    }

    if (mIsCoo)
    {
        if (mContentView instanceof CoordinatorLayout)
        {
            CoordinatorLayout coo = (CoordinatorLayout) mContentView;
            mAppBar = (AppBarLayout) coo.getChildAt(0);
            setAppBarListener();
        } else
        {
            throw new IllegalStateException("CommonPtrLayout: mContentView is not CoordinatorLayout");
        }

        if (mScrollContentView == null)
        {
            throw new IllegalStateException("CommonPtrLayout: mScrollContentView is null");
        }

        if (!(mScrollContentView instanceof NestedScrollingChild))
        {
            throw new IllegalStateException("CommonPtrLayout: mScrollContentView is not NestedScrollingChild");
        }
    }

    if (mRefreshEnabled)
    {
        if (mRefreshView == null)
            throw new IllegalStateException("CommonPrtLayout : You must set a refreshView when the refreshEnabled is true.");
        if (!(mRefreshView instanceof CommonPtrViewImpl))
            throw new IllegalStateException("CommonPrtLayout : The refreshView must instanceof CommonPtrViewImpl.");

        mRefreshView.setBackgroundResource(mRefreshBgResId);
        getRefreshView().setIsPullDownMode(true);
    }

    if (mLoadMoreEnabled)
    {
        if (mLoadMoreView == null)
            throw new IllegalStateException("CommonPrtLayout : You must set a loadMoreView when the refreshEnabled is true.");
        if (!(mLoadMoreView instanceof CommonPtrViewImpl))
            throw new IllegalStateException("CommonPrtLayout : The loadMoreView must instanceof CommonPtrViewImpl.");

        mLoadMoreView.setBackgroundResource(mLoadMoreBgResId);
        getLoadMoreView().setIsPullDownMode(false);
    }

    super.onFinishInflate();

    for (int i = 0; i < childCount; i++)
    {
        View v = getChildAt(i);
        if (v != mContentView)
            bringChildToFront(v);
    }
}
 

/**
 * 通过id得到相应的view
 */
@Override
protected void onFinishInflate() {

    final int childCount = getChildCount();

    if (childCount > 0) {
        mHeaderView = findViewById(com.canyinghao.canrefresh.R.id.can_refresh_header);
        mContentView = findViewById(com.canyinghao.canrefresh.R.id.can_content_view);
        mFooterView = findViewById(com.canyinghao.canrefresh.R.id.can_refresh_footer);
        mScrollView = findViewById(com.canyinghao.canrefresh.R.id.can_scroll_view);
    }

    if (mContentView == null) {
        throw new IllegalStateException("mContentView is null");
    }

    if (mIsCoo) {
        if (mContentView instanceof CoordinatorLayout) {

            CoordinatorLayout coo = (CoordinatorLayout) mContentView;

            mAppBar = (AppBarLayout) coo.getChildAt(0);


            setAppBarListener();

        } else {
            throw new IllegalStateException("mContentView is not CoordinatorLayout");
        }

        if (mScrollView == null) {
            throw new IllegalStateException("mScrollView is null");
        }

        if (mScrollView instanceof ViewPager) {

            mViewPager = (ViewPager) mScrollView;
            mIsViewPager = true;

        } else if (mScrollView instanceof NestedScrollingChild) {

            mIsViewPager = false;

        } else {
            throw new IllegalStateException("mScrollView is not NestedScrollingChild or ViewPager");
        }
    }

    if (mHeaderView != null && !(mHeaderView instanceof CanRefresh)) {

        throw new IllegalStateException("mHeaderView  error");
    }
    if (mFooterView != null && !(mFooterView instanceof CanRefresh)) {

        throw new IllegalStateException("mFooterView error");
    }

    if (mHeaderView != null) {

        getHeaderInterface().setIsHeaderOrFooter(true);
    }

    if (mFooterView != null) {

        getFooterInterface().setIsHeaderOrFooter(false);
    }


    super.onFinishInflate();


    setStyle(mHeadStyle, mFootStyle);

}