如何删除Android ViewPager中的页面？

Question

我正在尝试fragments在ViewPager下面的按钮单击中动态添加/删除,但如果我remove通过单击后退按钮获取片段(表单),并再次添加片段,则表单保留其数据(EditText不为空).

这是我的适配器:

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();
    }
}

添加proccess两次使用(在主Activity中):

PlaylistFragment playlistFragment = new PlaylistFragment();

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

删除页面(仍在主Activity中):

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

如何正确删除片段？

编辑:我试过这个,但表格没有重置;

编辑2:在实例化第二个片段后,onCreate()不调用其方法.

Answer 1

扩展FragmentStatePagerAdapter,并覆盖getItemPositionmethode:

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;
    }
}