Retrieving data from Firebase DB and storing in local variable: Android -

my app stores user location data in firebase realtime database. intend retrieve of data , process within app. able fetch desired data firebase db (checked through debugging). want store data in local variables. able store values except 1 value (debugger shows value null, though present in datasnapshot.). data firebase in userdatalocation object form , following class same:

userdatalocation class:

public class userlocationdata {      string mobile, name, latitude, longitude, proximity, connection_limit, last_updated;      public userlocationdata() {     }      public userlocationdata(string mobile, string name, string latitude, string longitude, string proximity, string connection_limit, string last_updated) {          this.mobile = mobile;         this.name = name;         this.latitude = latitude;         this.longitude = longitude;         this.proximity = proximity;         this.connection_limit = connection_limit;         this.last_updated = last_updated;     }      public string getmobile() {         return mobile;     }      public void setmobile(string mobile) {         this.mobile = mobile;     }      public string getname() {         return name;     }      public void setname(string name) {         this.name = name;     }      public string getlatitude() {         return latitude;     }      public void setlatitude(string latitude) {         this.latitude = latitude;     }      public string getlongitude() {         return longitude;     }      public void setlongitude(string longitude) {         this.longitude = longitude;     }      public string getproximity() {         return proximity;     }      public void setproximity(string proximity) {         this.proximity = proximity;     }      public string getconnection_limit() {         return connection_limit;     }      public void setconnection_limit(string connection_limit) {         this.connection_limit = connection_limit;     }      public string getlast_updated() {         return last_updated;     }      public void setlast_updated(string last_updated) {         this.last_updated = last_updated;     } } 

here how retrieving , storing data:

                   @override                     public void ondatachange(datasnapshot datasnapshot) {                          (datasnapshot child : datasnapshot.getchildren()) {                              userlocationdata = child.getvalue(userlocationdata.class);                             string connectionkey = child.getkey();                              if (!connectionkey.equals(currentusermobile)) {                                  (int count = 0; count <= integer.parseint(connections_limit); count++) {                                      **string last_updated = userlocationdata.last_updated;** //this showing null in debugger                                      location connectionlocation = getlocationfromlatlng(userlocationdata.latitude, userlocationdata.longitude);                                    {......}                               }                             }                         }                     }                 } 

all variable except string last_updated = userlocationdata.last_updated; having value.

can me resolve this???

i have resolved problem. error petty significant. actually, using last updated key store last updated time. problem format of key. should have been last_updated or else seems firebase db considers keys spaces invalid. so, changed key last_updated , problem solved.

hope helps someone.