Question

I am totally new to Android and trying for Fragments for the first time.
I have used a ListView activity which I am converting in a fragment.
But somehow the ListView element retrieved by findViewById() is giving me null.
Can anyone please help me on this.?

Here is the code for ListView Fragment and I m getting error after I call setAdapter method.
Log value shows timeTrackerListView as null.I dont know why.!! 🙁

 package ray.kaushik.nasaapp;

import android.app.Fragment;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;

public class TimeTracker extends Fragment{
    private Time_Tracker_Adapter timeTrackerAdapter;
    private String TAG = "TimeTracker";
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        timeTrackerAdapter = new Time_Tracker_Adapter();

    }

    public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState){
            return inflater.inflate(R.layout.time__tracker_layout, container, false);
    }

    public void onActivityCreated(Bundle savedInstanceState){
        super.onActivityCreated(savedInstanceState);
        ListView timeTrackerListView = (ListView) getActivity().findViewById(R.id.time_tracker_List);
        Log.i(TAG, "timeTrackerListView-->" + timeTrackerListView);
        timeTrackerListView.setAdapter(timeTrackerAdapter);
    }
}

Answer 1

onCreate() is called before onCreateView(). The ListView hasn’t been inflated yet, this is why you cannot find it…

Simply move the current onCreate() code into onCreateView() or onActivityCreated().

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You should be able to set up your ListView in onCreateView() with little trouble by saving a reference to the inflated View:

public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState){
    View view = inflater.inflate(R.layout.time__tracker_layout, container, false);
    ListView timeTrackerListView = (ListView) view.findViewById(R.id.time_tracker_List);
    timeTrackerAdapter = new Time_Tracker_Adapter();
    timeTrackerListView.setAdapter(timeTrackerAdapter);
    return view;
}

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Diagram from Developer’s Guide: