Android SharedPreferences in Fragment
AndroidAndroid FragmentsSharedpreferencesAndroid Problem Overview
I am trying to read SharedPreferences inside Fragment. My code is what I use to get preferences in any other Activity.
SharedPreferences preferences = getSharedPreferences("pref", 0);
I get error
Cannot make a static reference to the non-static method getSharedPreferences(String, int) from the type ContextWrapper
I have tried to follow these links but with no luck <https://stackoverflow.com/questions/3806051/accessing-sharedpreferences-through-static-methods> and <https://stackoverflow.com/questions/6241340/static-sharedpreferences>;. Thank you for any solution.
Android Solutions
Solution 1 - Android
The method getSharedPreferences
is a method of the Context
object, so just calling getSharedPreferences from a Fragment
will not work...because it is not a Context! (Activity is an extension of Context, so we can call getSharedPreferences from it).
So you have to get your applications Context by
// this = your fragment
SharedPreferences preferences = this.getActivity().getSharedPreferences("pref", Context.MODE_PRIVATE);
Solution 2 - Android
The marked answer didn't work for me, I had to use
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
EDIT:
Or just try removing the this
:
SharedPreferences prefs = getActivity().getSharedPreferences("pref", Context.MODE_PRIVATE);
Solution 3 - Android
As a note of caution this answer provided by the user above me is correct.
SharedPreferences preferences = this.getActivity().getSharedPreferences("pref",0);
However, if you attempt to get anything in the fragment before onAttach is called getActivity() will return null.
Solution 4 - Android
You can make the SharedPrefences
in onAttach
method of fragment like this:
@Override
public void onAttach(Context context) {
super.onAttach(context);
SharedPreferences preferences = context.getSharedPreferences("pref", 0);
}
Solution 5 - Android
This did the trick for me
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getContext());
Check here https://developer.android.com/guide/topics/ui/settings.html#ReadingPrefs
Solution 6 - Android
getActivity()
and onAttach()
didnot help me in same situation
maybe I did something wrong
but! I found another decision
I have created a field Context thisContext
inside my Fragment
And got a current context from method onCreateView
and now I can work with shared pref from fragment
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
...
thisContext = container.getContext();
...
}
Solution 7 - Android
To define the preference in Fragment:
SharedPreferences pref = getActivity().getSharedPreferences("CargaDatosCR",Context.MODE_PRIVATE); editor.putString("credi_credito",cre); editor.commit();
To call another activity or fragment the preference data:
SharedPreferences pref = getActivity().getSharedPreferences("CargaDatosCR", Context.MODE_PRIVATE); credit=pref.getString("credi_credito",""); if(credit.isNotEmpty)...
Solution 8 - Android
Maybe this is helpfull to someone after few years.
New way, on Androidx, of getting SharedPreferences()
inside fragment is to implement into gradle dependencies
implementation "androidx.preference:preference:1.1.1"
and then, inside fragment call
SharedPreferences preferences;
preferences = androidx.preference.PreferenceManager.getDefaultSharedPreferences(getActivity());
Solution 9 - Android
Given a fragment, you can setup your SharedPreferences like so:
val sharedPreferences = activity!!.applicationContext.getSharedPreferences(TAG, Context.MODE_PRIVATE) // kotlin
SharedPreferences sharedPreferences = getActivity().getApplicationContext().getSharedPreferences(TAG, Context.MODE_PRIVATE); // java
Let me know if you have any further questions.
Solution 10 - Android
It is possible to get a context from within a Fragment
Just do
public class YourFragment extends Fragment {
public View onCreateView(@NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
final View root = inflater.inflate(R.layout.yout_fragment_layout, container, false);
// get context here
Context context = getContext();
// do as you please with the context
// if you decide to go with second option
SomeViewModel someViewModel = ViewModelProviders.of(this).get(SomeViewModel.class);
Context context = homeViewModel.getContext();
// do as you please with the context
return root;
}
}
You may also attached an AndroidViewModel
in the onCreateView
method that implements a method that returns the application context
public class SomeViewModel extends AndroidViewModel {
private MutableLiveData<ArrayList<String>> someMutableData;
Context context;
public SomeViewModel(Application application) {
super(application);
context = getApplication().getApplicationContext();
someMutableData = new MutableLiveData<>();
.
.
}
public Context getContext() {
return context
}
}
Solution 11 - Android
use requiredactivity in fragment kotlin
val sharedPreferences = requireActivity().getSharedPreferences(loginmasuk.LOGIN_DATA, Context.MODE_PRIVATE)
Solution 12 - Android
Get Current Date and Time or get each every attributes from it:
import java.sql.Date;
import java.text.SimpleDateFormat;
import java.util.Calendar;
String timeStamp = new SimpleDateFormat( "dd/MM/yy HH:mm:ss").format(Calendar.getInstance().getTime());
String timeStamp1 = new SimpleDateFormat("dd/MM/yy").format(Calendar.getInstance().getTime());
String timeStamp2 = new SimpleDateFormat("dd").format(Calendar.getInstance().getTime());
System.out.print(timeStamp1);
if(timeStamp1.contains("10/03/21")) {
System.out.print("\ntrue");
}
else {
System.out.print("false");
}