How to update fragment content from activity (viewpager)?

Question

I have a simple viewPager with two fragments. Each fragment contains a TextView. I would like to be able to update the text of the current textView displayed from the activi

Answer 1

In your MyPagerAdapter class, Android calls getItem(...) only if it wants to create new Fragments. So it's problematic to use references there instead you should instatiate the fragments.

Check this Answer support-fragmentpageradapter-holds-reference-to-old-fragments

Answer 2

I solved this issue like this, create the adapter like this

package com.yubraj.sample.adapter;

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

import com.yubaraj.sample.activities.RashiFragment;
import java.util.List;


public class PageSliderAdapter extends FragmentStatePagerAdapter {
    static String[] titleList = new String[] { "today",
            "this month", "this year" };
    List<String> rashi;
    // private static String TAG = "pagerscreenslider";

    public PageSliderAdapter(FragmentManager fm, List<String> rashiList) {
        super(fm);
        this.rashi = rashiList;
    }
    public void updateData(List<String> rashisList){
        rashi.clear();
        this.rashi = rashisList;
        notifyDataSetChanged();
    }
    @Override
    public int getItemPosition(Object object) {
        // TODO Auto-generated method stub
        return POSITION_NONE;
    }

    @Override
    public Fragment getItem(int position) {
        Fragment fragment = new RashiFragment();
        Bundle bundle = new Bundle();
        bundle.putString("RASHI", rashi.get(position));
        bundle.putInt("RASHI_TYPE", position);
        fragment.setArguments(bundle);
        return fragment;
    }

    @Override
    public int getCount() {
        return titleList.length;
    }

    @Override
    public String getPageTitle(int position) {
        return titleList[position];
    }


}

Then from Your activity

List<String> rashiCollection = getJSONFromDb(Dates);
adapter.updateData(rashiCollection);

Answer 3

@Override
    public int getItemPosition(Object object) {
    XXXFragment fragment = (XXXFragment) object;
        if(…condition){
    fragment.refresh(…);
    }
        return super.getItemPosition(object);
    }

override the above. when you call notifyDataSetChanged(), the above method's triggered. do your refresh as you can.