CODEWITHSUNDEEP
androidandroid-fragmentsandroid-viewpagerandroid-arrayadapter
thomas-hiron
thomas-hiron

Reputation: 948

How to remove pages in Android ViewPager?

I'm trying to add/remove dynamically fragments in a ViewPager following a button click, but if I remove the fragment (a form) by clicking on back button, and add the fragment again, the form has kept its data (EditText not empty).

Here is my adapter :

package com.thomas.playlists.viewPager;

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

import java.util.ArrayList;

public class ViewPagerAdapter extends FragmentPagerAdapter
{
    ArrayList<Fragment> mList = null;

    public ViewPagerAdapter(FragmentManager fm)
    {
        super(fm);
        mList = new ArrayList<Fragment>();
    }

    public void add(Fragment fragment)
    {
        mList.add(fragment);
    }

    public void removeLast()
    {
        if(mList.size() > 1)
            mList.remove(getCount() - 1);
    }

    @Override
    public Fragment getItem(int i)
    {
        return mList.get(i);
    }

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

Adding proccess used twice (in main Activity) :

PlaylistFragment playlistFragment = new PlaylistFragment();

mViewPagerAdapter.add(playlistFragment);
mViewPagerAdapter.notifyDataSetChanged();
mViewPager.setCurrentItem(mViewPagerAdapter.getCount() - 1, true);

Removing a page (still in main Activity) :

mViewPagerAdapter.removeLast();
mViewPagerAdapter.notifyDataSetChanged();
mViewPager.setCurrentItem(mViewPagerAdapter.getCount() - 1, true);

How can I remove the fragment properly ?

EDIT : I tried this but the form isn't reseted;

EDIT 2 : After instanciating the second fragment, its onCreate() method isn't called.

Upvotes: 2

Views: 5668

Answers (1)

Feng Dai
Feng Dai

Reputation: 633

Extend FragmentStatePagerAdapter, and override getItemPosition methode:

public class ViewPagerAdapter extends FragmentStatePagerAdapter
{
    //... your existing code

    @Override
    public int getItemPosition(Object object) {
        int position = mList.indexOf(object);
        return position == -1 ? POSITION_NONE : position;
    }
}

Upvotes: 9

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