CODEWITHSUNDEEP
androidandroid-viewpager
Emil Adz
Emil Adz

Reputation: 41119

How to recreate all fragments in ViewPager:

I have this problem, I have a FragmentActivity with a ViewPager and a ViewPagerAdapter.

In this ViewPager I have 3 Fragments that each of them contains a TableLayout that gets populated programmaticly using a 2dArrayList.

on a click of a button in the FragmentActivity layout, I filter the data in the 2dArrayList and basically need to recreate all 3 Fragments with the new dataset (run the onCreateView method in all of them).

So I create an onClickListener for this button:

 private class SlicerSelectedOnClickListener implements OnClickListener {

    private ODSharedSlicer slicer;

    public SlicerSelectedOnClickListener(ODSharedSlicer slicer) {
        super();
        this.slicer = slicer;
    }

    public void onClick(View v) {
        String slicerValue = ((Button) v).getText().toString();
        Log.d(TAG,"Slicer value: "+ slicerValue +" chosen");
        application.currentReport.getODSharedSlicers().get(0).getSharedSlicerSelectedMemebers().add(slicerValue);

        ViewGroup parent = (ViewGroup) ((Button) v).getParent();

        for (int i = 0; i < parent.getChildCount(); i++) 
        {
            if ((parent.getChildAt(i) != v) && (parent.getChildAt(i) instanceof ToggleButton))
            {
                ((ToggleButton) parent.getChildAt(i)).setChecked(false);
            }
        }

        mPagerAdapter.notifyDataSetChanged();
    }
}

As you can see I have a mPagerAdapter.notifyDataSetChanged(); As suggested here:

How to recreate fragment with viewpager intentionally?

at the end of this method, So I expect the adapter to recreate all the Fragments, but the onCreateView from any of the fragments never runs.

Can any one suggest what am I doing wrong. any assistance would be appreciated.

Upvotes: 25

Views: 24152

Answers (4)

Ziad Gholmish
Ziad Gholmish

Reputation: 881

for those who still face the same problem which I faced the same problem when I have ViewPager with seven fragment. the default for these fragments to load the English content from the service but the problem here that I want to change the language from settings activity and after finish settings activity I want ViewPager in main activity to refresh the fragment to match the language selection from the user and load the Arabic content if user choose Arabic here what I did to work from the first trr :D

1. you must use FragmentStatePagerAdapter .*

  1. mainActivity I overrided the onResume and did the following

     if (!(mPagerAdapter == null)) {

         mPagerAdapter.notifyDataSetChanged();


     }

  2. I ovveride the getItemPosition() in mPagerAdapter and make it return POSITION_NONE.

     @Override
     public int getItemPosition(Object object) {

         return POSITION_NONE;
     }

works like charm

Upvotes: 24

Afzal Khan
Afzal Khan

Reputation: 346

getActivity.recreate() will recreate activity hence all fragments

Upvotes: 2

ceph3us
ceph3us

Reputation: 7474

on @Emil-adz solution we can go little ahead because we got fragment listy in my case called _fragments we can return fragment position like this:

@Override
public int getItemPosition(Object object) {
    /** check if object is fragment class */
    if (object.getClass().isAssignableFrom(Fragment.class)) {
        /** cast object to fragment */
        Fragment customFragment = (Fragment)object;
        /** return fragment position from our list */
        return _fragments.indexOf(customFragment);
    } else {
        /** else re-create */
        return POSITION_NONE;
    }
}

Upvotes: 0

Emil Adz
Emil Adz

Reputation: 41119

As been suggested here by @Luksprog, changing my adapter class to this:

public class ViewPagerAdapter extends FragmentPagerAdapter 
{
private List<Fragment> fragments;

/**
 * @param fm
 * @param fragments
 */
public ViewPagerAdapter(FragmentManager fm, List<Fragment> fragments) {
    super(fm);
    this.fragments = fragments;
}

/* (non-Javadoc)
 * @see android.support.v4.app.FragmentPagerAdapter#getItem(int)
 */

@Override
public Fragment getItem(int position) {
    return this.fragments.get(position);
}

/* (non-Javadoc)
 * @see android.support.v4.view.PagerAdapter#getCount()
 */

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

@Override
public int getItemPosition(Object object) {
    return POSITION_NONE;
}  
}

Fixed my issue.

what I did was to add this method:

@Override
public int getItemPosition(Object object) {
    return POSITION_NONE;
}

Upvotes: 12

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