Calling SharedPreferences from DialogFragment inside onClick of another fragment

Question

I'm querying SharedPreferences inside a DialogFragment class called from the onClick method of another fragment.

I've followed these links, but with no luck: Android SharedPreferences in Fragment, Accessing SharedPreferences through static methods, Static SharedPreferences.

My code is as follows:

QueryPreferences.java:

public class QueryPreferences
{
    private static final String PREF_FIRST_RUN = "firstRun";

    public static Boolean getFirstRun(Context context)
    {
        return PreferenceManager.getDefaultSharedPreferences(context).getBoolean(PREF_FIRST_RUN, true);
    }

    public static void setFirstRun(Context context, boolean firstRun)
    {
        PreferenceManager.getDefaultSharedPreferences(context)
                .edit()
                .putBoolean(PREF_FIRST_RUN, firstRun)
                .apply();
    }
}

MainFragment.java:

public class MainFragment extends Fragment
{
    private static final String DIALOG_CHOOSER = "DialogChooser";

    private TextView mTextView;

    public static MainFragment newInstance()
    {
        return new MainFragment();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        View v = inflater.inflate(R.layout.fragment_main, container, false);

        mTextView = (TextView)v.findViewById(R.id.some_text);

        mTextView.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                FragmentManager manager = getFragmentManager();
                SomeDialogFragment dialog = new SomeDialogFragment();
                dialog.show(manager, DIALOG_CHOOSER);
            }
        });

        return v;
    }
}

SomeDialogFragment:

public class SomeDialogFragment extends DialogFragment
{    
    private boolean firstRun = QueryPreferences.getFirstRun(context);
}

I do not know what to put in "context" in the SomeDialogFragment code snippet above.

Whatever i have tried give me a NullPointerException.

The things i have tried so far are:

SomeDialogFragment.this.getParentFragment().getActivity()
SomeDialogFragment.this
SomeDialogFragment.this.getActivity()
SomeDialogFragment.this.getActivity().getApplicationContext()
SomeDialogFragment.this.getParentFragment().getActivity().getApplicationContext()

EDIT: I'm calling firstRun from an inner class.

You need to wait onCreate() to assign your field. `SomeDialogFragment.this.getActivity()` should work for context — Oyashiro, Jun 28 '17 at 15:14

Rami Amro Ahmed · Answer 1 · 2017-06-29T11:15:32.287

0

context can be acquired when the fragment is first created in onCreate Method

class SomeDialogFragment extends DialogFragment
{    
   private boolean firstRun;

   @Override
   public void onCreate(Bundle savedInstanceState) {
      firstRun = QueryPreferences.getFirstRun(getContext());
   }       
}

edited Jun 29 '17 at 11:15

answered Jun 28 '17 at 15:20

Rami Amro Ahmed

782
1
8
11

Please add some text to explain your answer – EBH Jun 28 '17 at 22:17

score 0 · Answer 2 · edited Oct 16 '17 at 01:09

0

You can do something like this

public class SomeDialogFragment extends DialogFragment
{
    private boolean firstRun;  
    private Context context;  
    public SomeDialogFragment()
    {  
        context = getActivity();  
        firstRun = QueryPreferences.getFirstRun(context);  
    }   
}

edited Oct 16 '17 at 01:09

Pang

9,564
146
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answered Jun 28 '17 at 19:41

Roshan Baig

1
3

Calling SharedPreferences from DialogFragment inside onClick of another fragment

2 Answers2