Question

Really simple but just not getting it.
I want to reference a view by ID that is in the Fragments XML File that I inflate.

I’m declaring the view.

TextView nameView;

I’m getting the view from the layout.

View view = inflater.inflate(R.layout.trackfrag, group, false);
nameView = (TextView)view.findViewById(R.id.trackName);

I get the problem in the below method when it is called from its activity.

 public void setTrackDetails (String name, String description) {
    Log.e("TRACKFRAG", "setTrackDetails Called");
    nameView.setText(name);
    Log.e("TRACKFRAG", "setTrackDetails Finished");
}

Any help would be much appreciated.

ADDED XML

            <TextView
            android:id="@+id/trackName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_above="@id/anchor"
            android:text="Track Name"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:textSize="22sp" />

The Fragment loads up and is displayed fine if I don’t call this method but I need a way of changing the text in one of the Text Views.

ADDED FRAGMENT CREATION

public void onTrackSelected(String track) {
    Log.e("FRAGTRANS","History List Pressed");

    Fragment trackFrag = getFragmentManager().findFragmentByTag("historytrack");
    if (trackFrag == null) {
        trackFrag = new TrackFragment();
        Log.e("TRACKSEL","new trackfrag created");
    }

    addFragment(trackFrag, true, HISTORYTAG, FragmentTransaction.TRANSIT_NONE);

    ((TrackFragment) trackFrag).setTrackDetails(track,"testing");
}

ADD FRAGMENT METHOD

void addFragment(Fragment fragment, boolean addToBackStack, String tag, int transition) {
        FragmentTransaction ft = getFragmentManager().beginTransaction();
        ft.replace(android.R.id.content, fragment);
        ft.setTransition(transition);
        if (addToBackStack)
            ft.addToBackStack(null);
        ft.commit();
    }

Answer 1

Your problem is in invoking setTrackDetails() method. Please look here where you can see that:

Calling commit() does not perform the transaction immediately. Rather, it schedules it to run on the activity’s UI thread (the “main” thread) as soon as the thread is able to do so.

So just after you invoke commit your fragment is not created yet or creating is in progress and your nameView isn’t set yet.
Best solution would be after creating your fragment(can be after setting nameView because fragment already has activity) invoking method from activity which takes text:

View view = inflater.inflate(R.layout.trackfrag, group, false);
nameView = (TextView)view.findViewById(R.id.trackName);
String str = ((MyActivity)getActivity()).getTextForLabel();
nameView.setText(str);

Please read documentation about fragments and its lifecycle.