java.lang.NullPointerException: (Fragment)

Question

I'm trying to create a Navigation Menu + Tabs, the code for this is fine.

Now I've implemented some code I had as an Activity in a Fragment in order to add it to the Tabs viewer.

When I run the code the app works just fine.. Until I swipe right to the other Tab and then the App crashed and I get this from the logcat:

java.lang.NullPointerException: Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference

I'm leaving you my Main Activity, 'cause I think there's the issue, if you think you might need some Fragments like the Tabs, please just ask!

CODE: http://pastebin.com/TTcJMR77

Please include the relevant code in the question.

Matsemann
– Matsemann

2015-10-23 18:23:25 +00:00
Commented Oct 23, 2015 at 18:23 — Matsemann
– Matsemann, Commented Oct 23, 2015 at 18:23
Did you see the Pastebin? @Matsemann

FET
– FET

2015-10-23 18:54:34 +00:00
Commented Oct 23, 2015 at 18:54 — FET
– FET, Commented Oct 23, 2015 at 18:54

Michele · Accepted Answer · 2015-10-23 20:40:26Z

1

You have to add default case on your switch in getItem(int position) method:

default:
return new Fragment();

Instead of

return null;

Like this:

@Override
public Fragment getItem(int position) {
    switch (position) {
        case 0:
            return new YourFragment();
        default:
            return new Fragment();
    }
}

edited Oct 23, 2015 at 20:40

answered Oct 23, 2015 at 19:50

Michele

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6 Comments

FET Over a year ago

Just to know, are you from Italy?

FET Over a year ago

I think I need to change all my imports on the support.v4 on the simple .app one right?

Michele Over a year ago

Yes, if you want, we can move discussion to chat.

FET Over a year ago

Might be a better option for everyone yeah

FET Over a year ago

But I think ya can start it, not me

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