android - AlertDialog in PreferenceFragment crashes app -

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i'm trying create alertdialog in preferencefragment user can confirm he/she wants delete user data.

this code i've made:

public class settingsfragment extends preferencefragment {  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      bundle b = getarguments();     addpreferencesfromresource(r.xml.preferences);       preference button = (preference)findpreference(getstring(r.string.delete_user_info));     button.setonpreferenceclicklistener(new preference.onpreferenceclicklistener() {         @targetapi(build.version_codes.m)         @override         public boolean onpreferenceclick(preference preference) {             //an alertbuilder             new alertdialog.builder(getcontext()) //this line crashes app                     .setmessage("do want permanently delete likes?\nyou not able restore them!!")                     .setcancelable(true)                     .setpositivebutton("yes", new dialoginterface.onclicklistener() {                         @override                         public void onclick(dialoginterface dialoginterface, int i) {                             new deleteuserinfo().execute();                         }                     })                     .setnegativebutton("no", new dialoginterface.onclicklistener() {                         @override                         public void onclick(dialoginterface dialoginterface, int i) {                             dialoginterface.cancel();                         }                     })                     .create()                     .show();             return true;         }     }); } }

and result in logcat:

11-01 18:58:38.501 29821-29821/com.astudio.andreas.mapstest e/androidruntime: fatal exception: main 11-01 18:58:38.501 29821-29821/com.astudio.andreas.mapstest e/androidruntime: process: com.astudio.andreas.mapstest, pid: 29821 11-01 18:58:38.501 29821-29821/com.astudio.andreas.mapstest e/androidruntime: java.lang.nosuchmethoderror: no virtual method getcontext()landroid/content/context; in class lcom/astudio/andreas/mapstest/settingsfragment; or super classes (declaration of 'com.astudio.andreas.mapstest.settingsfragment' appears in /data/app/com.astudio.andreas.mapstest-1/base.apk) 11-01 18:58:38.501 29821-29821/com.astudio.andreas.mapstest e/androidruntime:     @ com.astudio.andreas.mapstest.settingsfragment$1.onpreferenceclick(settingsfragment.java:41)

any ideas on how can reference context correctly?

use getactivity() instead of getcontext().


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