How to attach fragment to activity?

Question

I have activity with fragments:

for (String tab_name : tabs) {
    getActionBar().addTab(mActionBar.newTab().setText(tab_name)
                          .setTabListener(this));
}

FragmentManager fm = getSupportFragmentManager();
fm.beginTransaction().add(new FirstFragment(), "TEST").commit();
fm.beginTransaction().add(new SecondFragment(), "TEST").commit();
fm.beginTransaction().add(new ThirdFragment(), "TEST").commit();

When I want to call new Activity from my SecondFragment:

Intent intent =  new Intent(App.context, SomeActivity.class);
startActivity(intent);

It crashes with this error:

03-22 00:22:19.439: E/AndroidRuntime(17438): java.lang.IllegalStateException: Fragment ... not attached to Activity

App.context is from MainActivity:

App.context = getApplicationContext();

What I can know that to attach fragment to activity, can be done by adding the fragment to fragmentManager, but it still crash. What I am wrong here?

holding a static context is VERY VERY BAD, it causes a memory leak — tyczj, Mar 21 '15 at 17:56

score 1 · Answer 1 · answered Mar 21 '15 at 18:02

1

Instead of

Intent intent =  new Intent(App.context, SomeActivity.class);
startActivity(intent);

use

Intent intent =  new Intent(getActivity(), SomeActivity.class);
startActivity(intent);

instead of using App.context use getActivty()

answered Mar 21 '15 at 18:02

Fahim

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It returns null, although I create variable and get activity from onAttach and use that variable in my method.. – Rendy Mar 21 '15 at 18:12
why do you want to create a variable? also share me the onAttach code – Fahim Mar 21 '15 at 18:19
To pass activity. Got this resolved anyway, but startActivity still crash my app. – Rendy Mar 21 '15 at 18:21
what exception do you get now? – Fahim Mar 21 '15 at 18:22
Still the same. isAdded() still returns false because my fragment still not attached to activity. – Rendy Mar 21 '15 at 18:25

score 0 · Answer 2 · answered Mar 21 '15 at 18:07

0

As holding a context is very bad. Just use this

Intent intent =  new Intent(getActivity(), SomeActivity.class);
startActivity(intent);

answered Mar 21 '15 at 18:07

Setu Kumar Basak

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It returns null, although I create variable and get activity from onAttach and use that variable in my method.. – Rendy Mar 21 '15 at 18:13

How to attach fragment to activity?

2 Answers2