ViewPagerTabScrollViewFragment.java

package com.marshalchen.common.demoofui.observablescrollview;

import android.app.Activity;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;

import com.github.ksoichiro.android.observablescrollview.ObservableScrollView;
import com.github.ksoichiro.android.observablescrollview.ObservableScrollViewCallbacks;
import com.marshalchen.common.demoofui.R;

public class ViewPagerTabScrollViewFragment extends Fragment {

    public static final String ARG_SCROLL_Y = "ARG_SCROLL_Y";

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.observable_scroll_view_fragment_scrollview, container, false);

        final ObservableScrollView scrollView = (ObservableScrollView) view.findViewById(R.id.scroll);
        Activity parentActivity = getActivity();
        if (parentActivity instanceof ObservableScrollViewCallbacks) {
            // Scroll to the specified offset after layout
            Bundle args = getArguments();
            if (args != null && args.containsKey(ARG_SCROLL_Y)) {
                final int scrollY = args.getInt(ARG_SCROLL_Y, 0);
                ViewTreeObserver vto = scrollView.getViewTreeObserver();
                vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
                    @Override
                    public void onGlobalLayout() {
                        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
                            scrollView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
                        } else {
                            scrollView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                        }
                        scrollView.scrollTo(0, scrollY);
                    }
                });
            }
            scrollView.setScrollViewCallbacks((ObservableScrollViewCallbacks) parentActivity);
        }
        return view;
    }
}