@Override
    protected void onFinishInflate() {
        final int childCount = getChildCount();
        if (childCount > 2) {
            throw new IllegalStateException("PtrFrameLayout can only contains 2 children");
        } else if (childCount == 2) {
            if (mHeaderId != 0 && mHeaderView == null) {
                mHeaderView = findViewById(mHeaderId);
            }
            if (mContainerId != 0 && mContent == null) {
                mContent = findViewById(mContainerId);
            }

            // not specify header or content
            if (mContent == null || mHeaderView == null) {

                View child1 = getChildAt(0);
                View child2 = getChildAt(1);
                if (child1 instanceof PtrUIHandler) {
                    mHeaderView = child1;
                    mContent = child2;
                } else if (child2 instanceof PtrUIHandler) {
                    mHeaderView = child2;
                    mContent = child1;
                } else {
                    // both are not specified
                    if (mContent == null && mHeaderView == null) {
                        mHeaderView = child1;
                        mContent = child2;
                    }
                    // only one is specified
                    else {
                        if (mHeaderView == null) {
                            mHeaderView = mContent == child1 ? child2 : child1;
                        } else {
                            mContent = mHeaderView == child1 ? child2 : child1;
                        }
                    }
                }
            }
        } else if (childCount == 1) {
            mContent = getChildAt(0);

        } else {
            TextView errorView = new TextView(getContext());
            errorView.setClickable(true);
            errorView.setTextColor(0xffff6600);
            errorView.setGravity(Gravity.CENTER);
            errorView.setTextSize(20);
            errorView.setText("The content view in PtrFrameLayout is empty. Do you forget to specify its id in xml layout file?");
            mContent = errorView;
            addView(mContent);
        }

        if (mHeaderView != null) {
            mHeaderView.bringToFront();
        }
        super.onFinishInflate();
    }
This layout view for "Pull to Refresh(Ptr)" support all of the view, you can contain everything you want.
support: pull to refresh / release to refresh / auto refresh / keep header view while refreshing / hide header view while refreshing
It defines {@link PtrUIHandler}, which allows you customize the UI easily.
common/src/main/java/com/sxjs/common/widget/pulltorefresh/PtrFrameLayout.java