open Fragment from ActionBarActivity

Question

I have an ActionBarDrawerToggle which contains many fragments for example

RootFragment LoginFragment RegistrationFragment

from RootFragment i navigate to another activity like

Intent activity = new Intent(getActivity().getApplicationContext(),TestActivity.class);
activity.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(activity);
getActivity().finish();

how to navigate from TestActivity to LoginFragment

i'm using the following code for example:

startActivity(new Intent(TestActivity.this, RegistrationFragment.class));
                                            finish();

and the app crashes with the following message RegistrationFragment cannot be cast to android.app.Activity

Any help?

your `RegistrationFragment` should be inside an `Activity` right? — Blaze Tama, Dec 04 '14 at 12:15
MainActivity contains ActionBarDrawerToggle so to answer your question is MainActivity sorry i'm very new to android world — sger, Dec 04 '14 at 12:18
looks like you don't know what `Fragment` is and how its used. Read this before using `Fragment`: http://developer.android.com/guide/components/fragments.html — M-Wajeeh, Dec 04 '14 at 12:19
well my question is how to open from MainActivity a fragment — sger, Dec 04 '14 at 12:24

score 1 · Answer 1 · answered Dec 04 '14 at 12:19

the startActivity method is for starting an Activity not for adding Fragment. for adding Fragment you should do this :

      FragmentTransaction ft = getFragmentManager()
                        .beginTransaction();
      ft.replace(R.id.container, new RegistrationFragment());
      ft.commit();

and R.id.container is your fragment container's id in your xml

michal.z · Answer 2 · 2014-12-04T12:23:51.750

You cannot pass Fragment class as an argument in startActivity method. You have to pass Activity class there and when it'll be created show appropriate Fragment in just started Activity. In your case do:

startActivity(new Intent(TestActivity.this, ActionBarActivity.class));
finish();

And then in onCreate method of ActionBarActivity add fragment.

getFragmentManager().beginTransaction().add(containerViewId , RegistrationFragment).commit();

open Fragment from ActionBarActivity

2 Answers2