fragment嵌套viewpager viewpager嵌套fragment 的bug

项目需要的框架是上面是可滑动隐藏的头布局,下面是滑动切换的viewpager
之前填充viewpager 用的adapter是

package com.example.panghaha12138.testapp;

import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;

import java.util.ArrayList;


public class MyPagerAdapter extends PagerAdapter {


    private final ArrayList views;

    public MyPagerAdapter(ArrayList views) {
        this.views = views;
    }

    @Override
    public int getCount() {
        return views.size();
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }

    @Override
    public void destroyItem(ViewGroup container, int position,
                            Object object) {
        container.removeView(views.get(position));
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        container.addView(views.get(position));
        return views.get(position);
    }
}

不过这是我在自己demo 里写的 没有考虑到解耦的问题
因为是通过inflate 吹起来的view,操作代码都需要在一个fragment里写

view1 = View.inflate(getActivity(), R.layout.view3, null);
recyclerView1 = (RecyclerView) view1.findViewById(R.id.dongtailist);
swipeRefreshLayout1 = (SwipeRefreshLayout) view1.findViewById(R.id.refsh);

view2 = View.inflate(getActivity(), R.layout.view3, null);
recyclerView2 = (RecyclerView) view2.findViewById(R.id.dongtailist);
swipeRefreshLayout2 = (SwipeRefreshLayout) view2.findViewById(R.id.refsh);

这样不利于扩展和维护
所以采取用fragmentstatepageradapter

package com.example.panghaha12138.testapp;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;

import java.util.List;

/**
 * ━━━━ Code is far away from ━━━━━━
 *     ()      ()
 *     ( )    ( )
 *     ( )    ( )
 *   ┏┛┻━━━┛┻┓
 *   ┃   ━   ┃
 *   ┃ ┳┛ ┗┳ ┃
 *   ┃   ┻   ┃
 *   ┗━┓   ┏━┛
 *     ┃   ┃
 *     ┃   ┗━━━┓
 *     ┃       ┣┓
 *     ┃       ┏┛
 *     ┗┓┓┏━┳┓┏┛
 *      ┃┫┫ ┃┫┫
 *      ┗┻┛ ┗┻┛
 * ━━━━ bug with the more protecting ━━━
 *
 * @ClassName: Myadapter
 * @Description:
 * @Author: panghaha12138
 * @Create On 2017/8/8 00:01
 */

public class Myadapter extends FragmentStatePagerAdapter {

    public Myadapter(FragmentManager fm, List list) {
        super(fm);
        this.list = list;
    }

    public List list;
    public Myadapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {


        return list.get(position);
    }

    @Override
    public int getCount() {
        return list.size();
    }
}
package com.example.panghaha12138.testapp;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.view.ViewGroup;

/**
 * ━━━━ Code is far away from ━━━━━━
 *     ()      ()
 *     ( )    ( )
 *     ( )    ( )
 *   ┏┛┻━━━┛┻┓
 *   ┃   ━   ┃
 *   ┃ ┳┛ ┗┳ ┃
 *   ┃   ┻   ┃
 *   ┗━┓   ┏━┛
 *     ┃   ┃
 *     ┃   ┗━━━┓
 *     ┃       ┣┓
 *     ┃       ┏┛
 *     ┗┓┓┏━┳┓┏┛
 *      ┃┫┫ ┃┫┫
 *      ┗┻┛ ┗┻┛
 * ━━━━ bug with the more protecting ━━━
 *
 * @ClassName: Test2Adapter
 * @PackageName: com.example.panghaha12138.testapp
 * @Create On 2017/8/3 00:48
 * @Author: PangHaHa12138
 * @CSDN: http://blog.csdn.net/panghaha12138
 * @GitHub: https://github.com/PangHaHa12138
 * @jianshu: http://www.jianshu.com/u/4e577623e3f8
 * @Copyrights 2017/8/3 PangHaHa12138 All rights reserved.
 */

public class Test2Adapter extends FragmentPagerAdapter {
    private FragmentManager manager;

    public Test2Adapter(FragmentManager fm) {

        super(fm);
        this.manager = fm;
    }
    @Override
    public Fragment getItem(int position) {
        Fragment fragment = null;
        if (0 == position) {

            fragment = new Fraglab1();
        }
        if (1 == position) {
            fragment = new Fraglab2();
        }
        return fragment;
    }
    @Override
    public int getCount() {
        return 2;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        switch (position) {
            case 0:
                return "动态";
            case 1:
                return "头条";

        }
        return null;
    }
}

最最重要的一点!

在activity 里面我们经常是

getSupportFragmentManager()

来获取 fragmentmanger
但是在fragment里 需要

test2Adapter = new Test2Adapter(getChildFragmentManager());

因为现在是在fragment里面嵌套fragment 需要找到子fragment 的manger 如果
这样写

getActivity().getSupportFragmentManager()

获取到的是activity里面的 manger
工作时出现的bug 这里记录一下

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