android - Global variables not passing properly -

i have created class holds common variables , functions , inherited activity classes interface different ui pages in app. have been passing information between classes , activities using getvariable() , setvariable(input) functions. suddenly, can no longer pass information way (it had been working until recent edits, , can't figure out change screwed up). have used log outputs determine data storing - setvariable(input) functions - when called later getvariable() functions returns null. thoughts?

*note, started incorporating fragments project, extending fragmentactivity instead of activity on main class. don't think causing problem, it? if does, whats best practice pass global variable info, , use fragments?

code samples:

main inherited class:

public class menubaractivity extends fragmentactivity { private string keya; private string keyb; private int token; private string salt; private long expires;  public string getkeyb() {     return keyb; }  public string getkeya() {     return keya; }  public int gettokenid() {     return token; }  public void settoken(int tkn) {     token = tkn; }  public void setkeyb(string kyb) {     keyb = kyb; }  public void setkeya(string kya) {     keya = kya; }  //other common functions } 

login activity class (gets log in info web, stores global variables):

public class webcontentget extends menubaractivity{  public int trylogon(string uemail, string pw) {     //call new keys on start     jsonobject jobsend = new jsonobject();     try {         jobsend.put("email", uemail);         jobsend.put("password", pw);         t.start();         t.join();         if(getstatus() == user_status_successfullogin){             string data = getdata();             jsonobject jobreturn = new jsonobject(data);             string kya = jobreturn.getstring("keya");             string kyb = jobreturn.getstring("keyb");             int tkn = integer.parseint(jobreturn.getstring("tokenid"));             string salt = jobreturn.getstring("salt");             long exp = long.parselong(jobreturn.getstring("expiration"));             int uid = integer.parseint(jobreturn.getstring("userid")); // log outputs confirm data being read properly, , reported setx() functions             settoken(tkn);             setkeya(kya);             setkeyb(kyb);             setsalt(salt);             setexpires(exp);             log.d("webcontentget trylogin","login values stored");          }          return getstatus();     } catch (exception e) {         // todo auto-generated catch block         e.printstacktrace();         return getstatus();     }  } 

activity class, checks if keya/b/etc stored:

public class userlogin2 extends menubaractivity implements emaillistener { string emailin; string pwin; context context = this;  @override public void onemailloginclick(string email, string pw) {     log.d("userlogin2", "onemailloginclick");     emailin = email;     pwin = pw;     emailin = emailin.trim();     emailin = emailin.touppercase();     log.d("prepped email", emailin);      pwin = pwin.trim();     webcontentget webob = new webcontentget();     int weblog = webob.trylogon(emailin, pwin);     if (weblog == user_status_successfullogin) {         int tkn = gettokenid();         long exp = getexpires();         string kya = getkeya();         string kyb = getkeyb();         string slt = getsalt();         log.d("userlogin2 - token", string.valueof(tkn)); //log statements confirm getx() functions returning null         session.storeloginsession(emailin, pwin, thisuser, tkn, exp, kya, kyb, slt);              intent intent1 = new intent(context, mainactivitiy.class);             startactivity(intent1);      } else {         showdialog(this, "log in failure", "incorrect password");     }  }  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.userlogin2);  } } 

this cannot work, because have 2 differend instances of menubaractivity. not way pass data 1 activity in android.

if want use data 1 activity in activity, have add them intent in activity provides data, , extract them in other. more information see here: how pass data between activities in android application?

if don't want start activity , send data intent, have store data somewhere e.g. sharedpreferences , fetch them again: how use sharedpreferences in android store, fetch , edit values