一个带有两个带有动态片段的viewpager的活动

Question

我的问题是1个活动有2个viewpager来改变片段。顶部viewpager与固定片段（没有问题），但底部viewpager与变量（不固定计数）片段。
例如：top viewpage有片段-1，片段-1有它的viewpager，可以用固定片段改变片段（没问题）。
我可以声明变量片段（例如：fragment_4作为模板片段），但我不知道如何在片段中获取/设置对象。
谁能帮我 ？我试了好几天但没有解决方案，谢谢

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.text.Layout;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

import pl.droidsonroids.gif.GifImageView;

public class Fragment1 extends Fragment {

ViewPager pager;
ArrayList<View> pagerList;
private fragment_4 fragment4 = new fragment_4();
private fragment_5 fragment5 = new fragment_5();
private ListView lv;

public Fragment1() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_1, container, false);

    final List<Fragment> FragArr = new ArrayList<Fragment>();
    FragArr.add(fragment4);
    FragArr.add(fragment5);

    pager = (ViewPager)view.findViewById(R.id.viewPager);

    pager.setAdapter(new FragmentPagerAdapter(getChildFragmentManager()) {
        @Override
        public Fragment getItem(int position) {

            return FragArr.get(position);
            //return null;
        }

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




    /*  Set Data From Server    */
    TextView user_tv = (TextView)view.findViewById(R.id.family_name);
    String mammy = getResources().getString(R.string.mammy);
    user_tv.setText(mammy);

    ImageView user_iv = (ImageView)view.findViewById(R.id.main_img);
    user_iv.setImageResource(R.drawable.mammy);

    ImageView lock_iv = (ImageView)view.findViewById(R.id.lock_img);
    lock_iv.setImageResource(R.drawable.lock);

    ImageView battery_iv = (ImageView)view.findViewById(R.id.battery_img);
    battery_iv.setImageResource(R.drawable.battery_full);

    GifImageView giv = (GifImageView)view.findViewById(R.id.status_img);
    giv.setImageResource(R.drawable.away_always);

    TextView status_time_tv = (TextView)view.findViewById(R.id.status_time);
    String min = getResources().getString(R.string.minute);
    status_time_tv.setText("15 "+min);


    return view;
}
}