CODEWITHSUNDEEP
androidandroid-fragmentsandroid-viewpagerandroid-pageradapter
Jack Stern
Jack Stern

Reputation: 405

Remove or Clear All Fragments From ViewPager

I'm populating view pager through fragments likes this

pagerAdapter = new PagerAdapter(getSupportFragmentManager());
        mViewPager = (ViewPager) findViewById(R.id.container);

        for (int i = 0; i < 10; i++) {
            newfragment fragobj = new newfragment();
            fragobj.setArguments(bundle);
            pagerAdapter.addFragment(fragobj, "Category");
        }

            mViewPager.setAdapter(pagerAdapter);
            mViewPager.setCurrentItem(page);

I want to clear all fragments and add new fragments after clearing. If I add new fragments now it ads on with old fragments.

I tried many stack overflow answers but none of them worked for me.

Upvotes: 7

Views: 18503

Answers (5)

Grzesiek Eman
Grzesiek Eman

Reputation: 86

I use navController fragment and in one fragment I also had viewPager with few slides set in a "parent fragment, which was part of the nav tree".

Sadly after the parent fragment was destoryed, the frags created within it for view pager were not getting cleared and they were restored while resuming the app, even tho they couldn't be shown!!

I've set adapter to null in parent's fragment onDestroy()-. and it clears all frags used inside viewPager. enter image description here enter image description here

If you have similiar problem, this wokrs 100%.

Upvotes: 2

jeroent
jeroent

Reputation: 2138

With ViewPager2 (1.0.0) and FragmentStateAdapter I also found the current view not to be recreated after updating the data set using notifyDataSetChanged, even when the data corresponding to the current view is changed. Apparently, notifyDataSetChanged doesn't perform a very thorough investigation of what has been changed and assumes the current view to be still correct.

The workaround I found was to simply set the same adapter that I had already set for the previous data set again:

viewPager2.setAdapter(myFragmentStateAdapter);

Apparently, setting an adapter makes it flush the cached views, which makes very good sense of course. Luckily, it doesn't check whether it's the same adapter.

Upvotes: 1

C. Alen
C. Alen

Reputation: 214

Add this method in ViewPagerAdapter and call it when you want to clear fragments from viewPager

public void clear() {
    FragmentTransaction transaction = manager.beginTransaction();
    for (Fragment fragment : mFragmentList) {
        transaction.remove(fragment);
    }
    mFragmentList.clear();
    transaction.commitAllowingStateLoss();
}

Upvotes: 8

Kathan Shah
Kathan Shah

Reputation: 1755

the fragment was already getting removed and destroyed. the issue was of viewpages.

Only this worked for me

myViewPager.setSaveFromParentEnabled(false);

Cheers !

Upvotes: 21

ZeroOne
ZeroOne

Reputation: 9117

mViewPager : is the view you are using to set you Fragment

mViewPager = (YourViewPager) findViewById(R.id.myPager);

TABLE : is just a Integer list of the position of all my Fragments

public void destroyAllItem() {
        int mPosition = mViewPager.getCurrentItem();
        int mPositionMax = mViewPager.getCurrentItem()+1;
        if (TABLE.size() > 0 && mPosition < TABLE.size()) {
            if (mPosition > 0) {
                mPosition--;
            }

            for (int i = mPosition; i < mPositionMax; i++) {
                try {
                    Object objectobject = this.instantiateItem(mViewPager, TABLE.get(i).intValue());
                    if (objectobject != null)
                        destroyItem(mViewPager, TABLE.get(i).intValue(), objectobject);
                } catch (Exception e) {
                    Log.i(TAG, "no more Fragment in FragmentPagerAdapter");
                }
            }
        }
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        super.destroyItem(container, position, object);

        if (position <= getCount()) {
            FragmentManager manager = ((Fragment) object).getFragmentManager();
            FragmentTransaction trans = manager.beginTransaction();
            trans.remove((Fragment) object);
            trans.commit();
        }
    }

Upvotes: 1

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