Can i change title of my toolbar in my constructor if yes then how can it possible?

Question

public DashboardFragment() {


((AppCompatActivity) this.getActivity()).getSupportActionBar().setTitle("DashBoard");
}

If your fragment is embed in xml layout, the constructor will run before activity inited, then your will get an null pointer exception. — firemaples, Mar 29 '16 at 15:51
The call to getActivity() may return null if the Fragment isn't attached yet. So calling getActivity in the constructor will not work. You should call it when you know the Fragment is attached to the Activity, such as in onCreate. — chRyNaN, Mar 29 '16 at 15:53
i know that's why i"m asking for some other method to change my title,...... — Techysense, Mar 29 '16 at 15:54
Or you can add the fragment into fragment manager instead of embed in xml layout — firemaples, Mar 29 '16 at 15:54
http://developer.android.com/reference/android/app/Activity.html#setTitle(java.lang.CharSequence) — firemaples, Mar 29 '16 at 15:56
Why you need to change the title in fragment's constructor? You can do it in fragment's onCreate() or onAttach() method, this two methods will run after activity inited. — firemaples, Mar 29 '16 at 16:00
I have six items in my navigation drawer and i want to set my title according to my selected fragment. — Techysense, Mar 29 '16 at 16:06

score 1 · Answer 1 · answered Mar 29 '16 at 16:04

Assuming you have a Toolbar defined in your Activity's xml, you can access it from a Fragment using the following method:

Override the onAttach() method in your Fragment to get a reference to the parent Activity once it is available. Then, simply get your reference to the Toolbar (that should be defined in your Activity xml) and simply set the title. Like this...

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    Toolbar toolbar = (Toolbar) activity.findViewById(R.id.toolbar);
    toolbar.setTitle("Your Custom Title");
}

Can i change title of my toolbar in my constructor if yes then how can it possible?

1 Answers1