java - Null Pointer Exception for Default Shared Preference Manager -


sometimes when call edit on default shared preferences, nullpointerexception. know why is? below code , error.

sharedpreferences sharedpreferencesfinish = preferencemanager.getdefaultsharedpreferences(getactivity()); sharedpreferences.editor spef = sharedpreferencesfinish.edit();   java.lang.nullpointerexception: attempt invoke virtual method        'java.lang.string android.content.context.getpackagename()' on null object reference


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