Passing data between two Fragments in a VIewPager (Android) (NullPointerException)

Question

So basically I have 2 Fragments - `FragmentConverter` and `FragmentFavourites`, and I have one `MainActivity`. I'm trying to pass 4 arrays from the first fragment to the second one using an Interface called `Communicator`. The specific snippets are show below: ``` public interface Communicator { public void respond(String[] names, String[] codes, String[] symbols, int[] images); } ``` This is a method inside `FragmentFavourites`: ``` @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub String[] checkedNames = new String[counter]; String[] checkedCodes = new String[counter]; String[] checkedSymbols = new String[counter]; int[] checkedImages = new int[counter]; comm = (Communicator) getActivity(); int index = 0; if (item.getItemId() == R.id.action_save){ for (int i=0;i<checked.size();i++){ if (checked.get(i) == true){ checkedNames[index] = names[i]; checkedCodes[index] = codes[i]; checkedSymbols[index] = symbols[i]; checkedImages[index] = im…

Accepted Answer

EDITED:

When you call `fragmentPagerAdapter.getItem(1)` you are getting a new instance of the fragment so you are referring to a different object. this is why the view is null and you get the NullPointerException. If you need an adapter for only 2 fragments, you can try with something like that:

```
public class YourPagerAdapter extends android.support.v4.app.FragmentPagerAdapter {

private FragmentFavourites mFragFavourites;
        private FragmentConverter mFragConverter;

public YourPagerAdapter() {

// ... your code above
            this.mFragFavourites = new FragmentFavourites();
            this.mFragConverter = new FragmentConverter();
        }

@Override
        public Fragment getItem(int position) {

switch (position) {
                case 0:  
                    return mFragFavourites;

case 1:
                    return mFragConverter;                      
                default:
                    return null;
            }    
        }
    }
```

Passing data between two Fragments in a VIewPager (Android) (NullPointerException)

Solution

Problem