Loading previously stored data from SharedPreferences into PreferenceFragment

Question

I've followed the documentation to create a Preference Fragment. All of my preferences are working as expected, but I have a first and last name setting that I'd like to load dynamically from SharedPreferences. These values have already been stored when the user logged in.

Their values in strings.xml:

 <string name="first_name">first_name</string>
 <string name="last_name">last_name</string>

Them being saved on login:

editor.putString(mContext.getResources().getString(R.string.first_name), firstName);
editor.putString(mContext.getResources().getString(R.string.last_name), lastName);
editor.commit();

The preferences in preferences.xml:

   <EditTextPreference
                android:key="@string/first_name"
                android:inputType="text"
                android:persistent="true"
                android:title="First Name"/>
    <EditTextPreference
                android:key="@string/last_name"
                android:inputType="text"
                android:persistent="true"
                android:title="Last Name"/>

Trying to load them in Preference Fragment:

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        sessionManager = SessionManager.getInstance(getActivity());
        addPreferencesFromResource(R.xml.preferences);
        PreferenceManager.setDefaultValues(getActivity(), R.xml.preferences, false);

        // Set first and last name preference default values
        firstNamePreference = (EditTextPreference)findPreference("first_name");
        lastNamePreference = (EditTextPreference)findPreference("last_name");
        nearbyPreference = (CheckBoxPreference)findPreference("show_places");
//        firstNamePreference.setText(sessionManager.getUserFirstName());
//        firstNamePreference.setSummary(sessionManager.getUserFirstName());
//        lastNamePreference.setText(sessionManager.getUserLastName());
//        lastNamePreference.setSummary(sessionManager.getUserLastName());
        nearbyPreference.setDefaultValue(true);
    }

So I can set them manually (as well as the summary), but I'd really like to set them from the already set values in SharedPreferences. How can I do this?

Answer 1

So after looking through my code, I realized that my application stores preferences in a file other than the default. So, I had to do the following from this article:

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preferences);
        PreferenceManager.setDefaultValues(getActivity(), R.xml.preferences, false);


        sharedPreferences = getActivity().getSharedPreferences("file_name", 0); // 0 is private

        // show the current value in the settings screen
        for (int i = 0; i < getPreferenceScreen().getPreferenceCount(); i++) {
            pickPreferenceObject(getPreferenceScreen().getPreference(i));
        }
    }

private void pickPreferenceObject(Preference p) {
        if (p instanceof PreferenceCategory) {
            PreferenceCategory cat = (PreferenceCategory) p;
            for (int i = 0; i < cat.getPreferenceCount(); i++) {
                pickPreferenceObject(cat.getPreference(i));
            }
        } else {
            initSummary(p);
        }
    }

private void initSummary(Preference p) {
        if (p instanceof EditTextPreference) {
            EditTextPreference editTextPref = (EditTextPreference) p;
            String value = sharedPreferences.getString(editTextPref.getKey(), "");
            p.setSummary(value);
            ((EditTextPreference) p).setText(value);
        }
        // More logic for ListPreference, etc...
    }

Otherwise you could probably just set them each with the default prefs, accessed like so:

SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());