ListPreference, get value from fragment

Question

My app contains a listPreference with entries and an entryValues list in my strings.xml

I want to receive the value of the currently selected entry in a PreferenceFragment.

Right now, I use the following code to fetch these values, (and later on, convert the string into an integer to uuse it for an URL that depends on variables).

 @Nullable
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            myView = inflater.inflate(R.layout.first_layout, container, false);


ListPreference lP = (ListPreference) findPreference("example_list");
String currValue = lP.getValue();

int aktuelleklasse = Integer.valueOf(currValue);


return myView;
}

unfortunately, I get an error, saying

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.preference.ListPreference.getValue()' on a null object reference

So what do I need to do to get my value withouut error? (I've got quite basic skills so dont judge me, if thats an obvious problem :))

Thanks in advance!

score 2 · Accepted Answer · edited May 23 '17 at 11:46

2

Are you doing a addPreferencesFromResource(R.xml.preferencesFile) before this code section?
See PreferenceFragment.findPreference always returns NULL

edited May 23 '17 at 11:46

Community

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answered Mar 07 '17 at 18:07

LppEdd

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No, could you please tell me, where I need to look for my corresponding text for "preferencesFile"? – Quacksilber Mar 07 '17 at 18:14
It's the name of your preferences XML file. See the Vogella tutorial at http://www.vogella.com/tutorials/AndroidFileBasedPersistence/article.html#create-preference-file – LppEdd Mar 07 '17 at 18:22
oh, I could have thought about that xD. Thanks a lot! Everything works fine now! – Quacksilber Mar 07 '17 at 18:25
No problems. Awesome! – LppEdd Mar 07 '17 at 18:26

ListPreference, get value from fragment

1 Answers1