facebook - Why i am lose my Access Token in android? -


i working on facebook application in android.i running application 1 r 2 times access token works after third time loss access token.why,i lose access token?what can without lose of access token when run.

any 1 please me....

edit 1 :

protected void onactivityresult(int requestcode, int resultcode, intent data) {     // todo auto-generated method stub     super.onactivityresult(requestcode, resultcode, data);     mfacebook.authorizecallback(requestcode, resultcode, data); }

login button click::::

mbtnfblogin.setonclicklistener(new view.onclicklistener() {

        @override         public void onclick(view v) {             log.d("image button", "button clicked");             logintofacebook();         }     });

login method ::::::

public void logintofacebook() {

    mprefs = getpreferences(mode_private);     string access_token = mprefs.getstring("access_token", null);     long expires = mprefs.getlong("access_expires", 0);      if (access_token != null) {         mfacebook.setaccesstoken(access_token);          log.d("fb sessions", "" + mfacebook.issessionvalid());         toast.maketext(getapplicationcontext(), "login successfully",                 toast.length_long).show();        }      if (expires != 0) {         mfacebook.setaccessexpires(expires);     }      if (!mfacebook.issessionvalid()) {         mfacebook.authorize(this,                 new string[] { "email", "publish_stream" },                 new dialoglistener() {                      @override                     public void oncancel() {                         // function handle cancel event                         log.d("fb sessions",                                 "" + mfacebook.issessionvalid());                         toast.maketext(getapplicationcontext(),                                 "login cancel", toast.length_long).show();                     }                      @override                     public void oncomplete(bundle values) {                         // function handle complete event                         // edit preferences , update facebook acess_token                         sharedpreferences.editor editor = mprefs.edit();                         editor.putstring("access_token",                                 mfacebook.getaccesstoken());                         editor.putlong("access_expires",                                 mfacebook.getaccessexpires());                         editor.commit();                          log.d("fb sessions",                                 "" + mfacebook.issessionvalid());                         toast.maketext(getapplicationcontext(),                                 "login successfully", toast.length_long)                                 .show();                       }                      @override                     public void onerror(dialogerror error) {                         // function handle error                      }                      @override                     public void onfacebookerror(facebookerror fberror) {                         // function handle facebook errors                      }                  });     } }

access token expires every hour may running third time after hour


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