SharedPreferences (on a null object reference)

Question

I try to add and get data using sharedPreferences, but I only receive this error in logcat:

Attempt to invoke virtual method 'android.content.SharedPreferences
android.content.Context.getSharedPreferences(java.lang.String, int)'
on a null object reference

The line of code:

public static final String PREFS_NAME = "MyPrefsFile";
SharedPreferences prefs = getSharedPreferences(PREFS_NAME, 0); // <-error here

I need create first the xml file?

http://stackoverflow.com/questions/23024831/android-shared-preferences-example — Apurva, Jun 16 '16 at 10:05
have you written this code in the main activity ? or anywhere else . please explain more . — Sagar Nayak, Jun 16 '16 at 10:10

score 1 · Accepted Answer · answered Jun 16 '16 at 10:05

1

You need to initialize it after activity created:

public static final String PREFS_NAME = "MyPrefsFile";
SharedPreferences prefs;

onCreate(){
    prefs = getSharedPreferences(PREFS_NAME, 0);
}

answered Jun 16 '16 at 10:05

Ozgur

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SharedPreferences (on a null object reference)

1 Answers1