android - how can I edit "user_mobile" value -


i want edit "user_mobile" , "user_blood".

[1]: https://i.stack.imgur.com/6pljf.png

i have tried code.

 mauth = firebaseauth.getinstance();         string online_user_id = mauth.getcurrentuser().getuid();         getuserdatareference = firebasedatabase.getinstance().getreference().child("users").child(online_user_id);  getuserdatareference.addvalueeventlistener(new valueeventlistener() {             @override             public void ondatachange(datasnapshot datasnapshot) {                 //datasnapshot.get                  string name = datasnapshot.child("user_name").getvalue().tostring();                 string status = datasnapshot.child("user_status").getvalue().tostring();                 string image = datasnapshot.child("user_image").getvalue().tostring();                 mobile = datasnapshot.child("user_mobile").getvalue().tostring();                 string thumb_image = datasnapshot.child("user_thumb_image").getvalue().tostring();                  settingdisplayname.settext(name);                 settingdisplaystatus.settext(status);                  if (!image.equals("default_profile"))                 {                     picasso.with(settingactivity.this).load(image).placeholder(r.drawable.default_profile).into(settingsdisplayimage);                 }              }              @override             public void oncancelled(databaseerror databaseerror) {              }         });

here error.

fatal exception: main                                                                       process: com.logictex.bloodbank, pid: 2486                                                                       java.lang.nullpointerexception: attempt invoke virtual method 'java.lang.string java.lang.object.tostring()' on null object reference                                                                           @ com.logictex.bloodbank.settingactivity$1.ondatachange(settingactivity.java:77)                                                                           @ com.google.android.gms.internal.zzbmz.zza(unknown source)                                                                           @ com.google.android.gms.internal.zzbnz.zzyj(unknown source)                                                                           @ com.google.android.gms.internal.zzboc$1.run(unknown source)                                                                           @ android.os.handler.handlecallback(handler.java:739)                                                                           @ android.os.handler.dispatchmessage(handler.java:95)                                                                           @ android.os.looper.loop(looper.java:135)                                                                           @ android.app.activitythread.main(activitythread.java:5254)                                                                           @ java.lang.reflect.method.invoke(native method)                                                                           @ java.lang.reflect.method.invoke(method.java:372)                                                                           @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:903)                                                                           @ com.android.internal.os.zygoteinit.main(zygoteinit.java:698) 

databasereference xyz=  firebasedatabase.getinstance().getreference().child("users").child(online_user_id).child("user_mobile"); xyz.setvalue("set_desired vaule");

do same use_blood


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