android - com.firebase.client.FirebaseException: Failed to bounce to type JSON -

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i have code here..

main_menu.java

@override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main_menu);         getdata();     }  private void getdata(){         string url = config.data_url+a_username;         requestqueue requestqueue = volley.newrequestqueue(this);         log.d(tag,"merging url , name success");         stringrequest stringrequest = new stringrequest(request.method.get, url, new response.listener<string>() {             @override             public void onresponse(string response) {                 showjson(response);                 log.d(tag,"show json success");             }         },                 new response.errorlistener() {                     @override                     public void onerrorresponse(volleyerror error) {                      }                 });         requestqueue.add(stringrequest); } private void showjson(string response){          try {             jsonobject jsonobject = new jsonobject(response);             jsonarray result = jsonobject.getjsonarray(config.json_array);             jsonobject userid = result.getjsonobject(0);             id = userid.getstring(config.key_id).tostring().trim();             toast.maketext(getapplicationcontext(),id,toast.length_long).show();             log.d(tag,"getting id success");         } catch (jsonexception e) {             e.printstacktrace();         }     }  @override     protected void  onstart(){         super.onstart();         real_id = id.tostring();         mref = new firebase("https://connection-4f6d8.firebaseio.com/"+real_id);         mref.addvalueeventlistener(new valueeventlistener() {             @override             public void ondatachange(datasnapshot datasnapshot) {                 string text = datasnapshot.getvalue(string.class);                 if(text.equals("unlocked")){                     senddataonwifi("0");                 }             }              @override             public void oncancelled(firebaseerror firebaseerror) {              }         });     }

execption:

fatal exception: main process: com.example.jaypeetan.mftis, pid: 32112com.firebase.client.firebaseexception: failed bounce type @ com.firebase.client.datasnapshot.getvalue(datasnapshot.java:185) @ com.example.jaypeetan.mftis.main_menu$6.ondatachange(main_menu.java:290) @ com.firebase.client.core.valueeventregistration.fireevent(valueeventregistration.java:56) @ com.firebase.client.core.view.dataevent.fire(dataevent.java:45)                     @ com.firebase.client.core.view.eventraiser$1.run(eventraiser.java:38) @ android.os.handler.handlecallback(handler.java:733) @ android.os.handler.dispatchmessage(handler.java:95) @ android.os.looper.loop(looper.java:149) @ android.app.activitythread.main(activitythread.java:5257) @ java.lang.reflect.method.invokenative(native method) @ java.lang.reflect.method.invoke(method.java:515) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:793) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:609) @ dalvik.system.nativestart.main(native method) caused by: com.fasterxml.jackson.databind.jsonmappingexception: can not deserialize instance of java.lang.string out of start_array token @ [source: java.io.stringreader@22c79a40; line: 1, column: 1] @ com.fasterxml.jackson.databind.deserializationcontext.mappingexception(deserializationcontext.java:575) @ com.fasterxml.jackson.databind.deser.std.stringdeserializer.deserialize(stringdeserializer.java:46) @ com.fasterxml.jackson.databind.deser.std.stringdeserializer.deserialize(stringdeserializer.java:11) @ com.fasterxml.jackson.databind.objectmapper._readmapandclose(objectmapper.java:2888) @ com.fasterxml.jackson.databind.objectmapper.readvalue(objectmapper.java:2034) @ com.firebase.client.datasnapshot.getvalue(datasnapshot.java:183)                                                                                     ... 13 more

i believe error json need user id in database im getting correctly problem when tried connect in firebase giving me error.. tried change variable real_id value number , working when depends on json gives me error.. please me :d

this snapchat of firebase enter image description here

you store mix of string numbers in same list. in code ask string:

// fails when snapshot value number string text = datasnapshot.getvalue(string.class);

that won't work, since number not string (even though can converted one).

if insist on mixing types, code extracts value must able handle mixed types. example:

public void ondatachange(datasnapshot datasnapshot) {     string text = string.valueof(datasnapshot.getvalue());

by using datasnapshot.getvalue() without type, whatever type stored in snapshot. convert string string.valueof().

i recommend sticking single uniform type in list. it'll make code less error prone , easier understand.


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