Null object reference Android Azure -
i have problem azure mobile services on android, see exmaple todoitem , create instance called user to save data. code
public class user { @com.google.gson.annotations.serializedname("email") private string email; @com.google.gson.annotations.serializedname("password") private string password; @com.google.gson.annotations.serializedname("name") private string name; @com.google.gson.annotations.serializedname("lastname") private string lastname; @com.google.gson.annotations.serializedname("phone") private string phone; public user(){ } public user(string email, string password, string name, string lastname, string phone){ this.setemail(email); this.setpassword(password); this.setname(name); this.setlastname(lastname); this.setphone(phone); } public string getemail() { return email; } public string getpassword() { return password; } public string getname() { return name; } public string getlastname() { return lastname; } public string getphone() { return phone; } public void setemail(string email) { this.email = email; } public void setpassword(string password) { this.password = password; } public void setname(string name) { this.name = name; } public void setlastname(string lastname) { this.lastname = lastname; } public void setphone(string phone) { this.phone = phone; } }
and code of useractivity
public class useractivity extends activity { private mobileserviceclient muser; private mobileservicetable<user> mtodotable; private edittext edittextemail; private edittext edittextmp; private edittext edittextname; private edittext edittextlastname; private edittext edittextphone; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_user); edittextemail = (edittext) findviewbyid(r.id.edittextemail); edittextmp = (edittext) findviewbyid(r.id.edittextmp); edittextname = (edittext) findviewbyid(r.id.edittextname); edittextlastname = (edittext) findviewbyid(r.id.edittextlastname); edittextphone = (edittext) findviewbyid(r.id.edittextphone); try { // create mobile service client instance, using provided // mobile service url , key muser = new mobileserviceclient( "******", "******", this); } catch (malformedurlexception e) { createandshowdialog(new exception("there error creating mobile service. verify url"), "error"); } } public user additemintable(user user) throws executionexception, interruptedexception { user entity = mtodotable.insert(user).get(); return entity; } private asynctask<void, void, void> runasynctask(asynctask<void, void, void> task) { if (build.version.sdk_int >= build.version_codes.honeycomb) { return task.executeonexecutor(asynctask.thread_pool_executor); } else { return task.execute(); } } public void additem(view view) { if (muser == null) { return; } final user user = new user(); user.setemail(edittextemail.gettext().tostring()); user.setpassword(edittextmp.gettext().tostring()); user.setname(edittextname.gettext().tostring()); user.setlastname(edittextlastname.gettext().tostring()); user.setphone(edittextphone.gettext().tostring()); // insert new item asynctask<void, void, void> task = new asynctask<void, void, void>(){ @override protected void doinbackground(void... params) { try { final user entity = additemintable(user); } catch (final exception e) { createandshowdialogfromtask(e, "error"); } return null; } }; runasynctask(task); edittextemail.settext(""); edittextmp.settext(""); edittextname.settext(""); edittextlastname.settext(""); edittextphone.settext(""); } /** * creates dialog , shows * * @param exception * exception show in dialog * @param title * dialog title */ private void createandshowdialogfromtask(final exception exception, string title) { runonuithread(new runnable() { @override public void run() { createandshowdialog(exception, "error"); } }); } /** * creates dialog , shows * * @param exception * exception show in dialog * @param title * dialog title */ private void createandshowdialog(exception exception, string title) { throwable ex = exception; if(exception.getcause() != null){ ex = exception.getcause(); } createandshowdialog(ex.getmessage(), title); } /** * creates dialog , shows * * @param message * dialog message * @param title * dialog title */ private void createandshowdialog(final string message, final string title) { final alertdialog.builder builder = new alertdialog.builder(this); builder.setmessage(message); builder.settitle(title); builder.create().show(); } private asynctask<void, void, void> initlocalstore() throws mobileservicelocalstoreexception, executionexception, interruptedexception { asynctask<void, void, void> task = new asynctask<void, void, void>() { @override protected void doinbackground(void... params) { try { mobileservicesynccontext synccontext = muser.getsynccontext(); if (synccontext.isinitialized()) return null; sqlitelocalstore localstore = new sqlitelocalstore(muser.getcontext(), "offlinestore", null, 1); map<string, columndatatype> tabledefinition = new hashmap<string, columndatatype>(); tabledefinition.put("email", columndatatype.string); tabledefinition.put("password", columndatatype.string); tabledefinition.put("name", columndatatype.string); tabledefinition.put("lastname", columndatatype.string); tabledefinition.put("phone", columndatatype.string); localstore.definetable("user", tabledefinition); simplesynchandler handler = new simplesynchandler(); synccontext.initialize(localstore, handler).get(); } catch (final exception e) { createandshowdialogfromtask(e, "error"); } return null; } }; return runasynctask(task); } }
after click on button, exception shown: attempt invoke virtual method 'com.google.common.util.concurrent.listenablefutre com.microsoft.windowsazure.mobileservices.table.mobileservicetable.insert(java.lang.object)' on null object refrence. help
you declared field mtodotable in class, never initialized it. can initialize after creating mobileserviceclient instance:
try { // create mobile service client instance, using provided // mobile service url , key muser = new mobileserviceclient( "******", "******", this); mtodotable = muser.gettable("user", user.class); } catch (...) you'll need add new member user class, id, represent identifier of user in database.
public class user { // ... @com.google.gson.annotations.serializedname("id") private string id; // can add get/set if want. }
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