Added better Entry handling, also added Entry.id

lib/Entry.dart

@@ -1,17 +1,20 @@
 import 'package:intl/intl.dart';
 
 class Entry {
+  final int id;
   final DateTime date;
   final String whatYouDid;
 
-  Entry(this.date, this.whatYouDid);
+  Entry(this.id, this.date, this.whatYouDid);
 
   Entry.fromJson(Map<String, dynamic> json)
-    : date = DateTime.parse(json['date']),
+    : id = json['id'],
+        date = DateTime.parse(json['date']),
         whatYouDid = json['whatyoudid'];
 
   Map<String, dynamic> toJson() =>
       {
+        'id': id,
         'date': date.toString(),
         'whatyoudid': whatYouDid,
       };

lib/FileLoader.dart

@@ -15,6 +15,12 @@ class FileLoader {
     return new File('$path/days.json');
   }
 
+  Future<bool> checkForFile() async {
+    final file = await _localFile;
+
+    return file.exists();
+  }
+
   Future<File> writeFile(String data) async {
     final file = await _localFile;
 

lib/NoZeroDays.dart

@@ -25,49 +25,32 @@ class NoZeroDays extends StatefulWidget {
 
 class _NoZeroDaysState extends State<NoZeroDays> {
   static List<Entry> _firstEntry = <Entry>[
-    Entry(new DateTime.now(), "Made this!")
+    Entry(0, new DateTime.now(), "Made this!")
   ];
+  FileLoader f = new FileLoader();
+
   List<Entry> _zerodayslist = new List<Entry>.from(_firstEntry);
 
-  Future<DateTime> _currentDatePicker() {
-    int currentYear = new DateTime.now().year;
-    return showDatePicker(
-        context: (context),
-        initialDate: new DateTime.now(),
-        firstDate: new DateTime(currentYear),
-        lastDate: new DateTime(currentYear + 1));
+  void _newEntry(DateTime date, String whatyoudid){
+    int highestID = 0;
+    for (var i = 0; i < _zerodayslist.length; ++i) {
+      if (_zerodayslist[i].id > highestID){
+        highestID = _zerodayslist[i].id;
+      }
     }
 
-  Widget _buildFAB() {
-    return new FloatingActionButton(
-      onPressed: () {
-        Future<DateTime> pickedDate = _currentDatePicker();
-        pickedDate.then((value) {
-          setState(() {
-            if (value != null) _zerodayslist.add(Entry(value, "nothing"));
-          });
-        }).catchError((err) {
-          Scaffold
-              .of(context)
-              .showSnackBar(new SnackBar(content: new Text(err.toString())));
-        });
-      },
-      tooltip: 'Make a new entry',
-      child: new Icon(Icons.add),
-    );
+    setState(() => _zerodayslist.add(new Entry(highestID + 1, date, whatyoudid)));
+
+    _save();
   }
 
-  Widget _buildRow(Entry entry) {
-    return new ListTile(
-      title: new Text(entry.toString()),
-      onTap: () {
-        _editEntry(entry);
-      },
-      trailing: new Icon(Icons.edit),
-    );
+  void _removeEntry(Entry entry) {
+    _zerodayslist.removeWhere((testEntry) => testEntry.id == entry.id);
+    _save();
   }
 
   void _editEntry(Entry entry) {
+    _removeEntry(entry);
     Navigator.of(context).push(new MaterialPageRoute(builder: (context) {
       final t = new Form(
         child: new Column(
@@ -83,9 +66,7 @@ class _NoZeroDaysState extends State<NoZeroDays> {
                   newDate.then((newValue) {
                     if (newValue != null) {
                       setState(() {
-                        _zerodayslist.remove(entry);
-                        _zerodayslist
-                            .add(new Entry(newValue, entry.whatYouDid));
+                        _newEntry(newValue, entry.whatYouDid);
                       });
                     }
                     Navigator.pop(context);
@@ -98,8 +79,7 @@ class _NoZeroDaysState extends State<NoZeroDays> {
               initialValue: entry.whatYouDid,
               onFieldSubmitted: (newValue) {
                 setState(() {
-                  _zerodayslist.remove(entry);
-                  _zerodayslist.add(new Entry(entry.date, newValue));
+                  _newEntry(entry.date, newValue);
                 });
                 Navigator.pop(context);
               },
@@ -122,18 +102,50 @@ class _NoZeroDaysState extends State<NoZeroDays> {
     }));
   }
 
+  Future<DateTime> _currentDatePicker() {
+    int currentYear = new DateTime.now().year;
+    return showDatePicker(
+        context: (context),
+        initialDate: new DateTime.now(),
+        firstDate: new DateTime(currentYear),
+        lastDate: new DateTime(currentYear + 1));
+  }
+
+  Widget _buildFAB() {
+    return new FloatingActionButton(
+      onPressed: () {
+        Future<DateTime> pickedDate = _currentDatePicker();
+        pickedDate.then((value) {
+          setState(() {
+            if (value != null) _newEntry(value, "nothing");
+          });
+        }).catchError((err) {
+          Scaffold
+              .of(context)
+              .showSnackBar(new SnackBar(content: new Text(err.toString())));
+        });
+      },
+      tooltip: 'Make a new entry',
+      child: new Icon(Icons.add),
+    );
+  }
+
+  Widget _buildRow(Entry entry) {
+    return new ListTile(
+      title: new Text(entry.toString()),
+      onTap: () {
+        _editEntry(entry);
+      },
+      trailing: new Icon(Icons.edit),
+    );
+  }
+
   void _save() {
-    FileLoader f = new FileLoader();
-
     f.writeFile(json.encode(_zerodayslist));
-
   }
 
   void _load() {
-    FileLoader f = new FileLoader();
-
     f.readFile().then((s) {
-      print(s);
       setState(() {
         List<Entry> newList = <Entry>[];
         List<dynamic> tempList = json.decode(s);
@@ -164,6 +176,15 @@ class _NoZeroDaysState extends State<NoZeroDays> {
       ),
       body: new Scaffold(body: new ListView.builder(
         itemBuilder: (context, entry) {
+          f.checkForFile().then((value) {
+            if (value) {
+              _load();
+            }
+            else {
+              f.writeFile("");
+            }
+          });
+
           if (entry < _zerodayslist.length) {
             return _buildRow(_zerodayslist[entry]);
           } else

pubspec.lock

@@ -63,7 +63,7 @@ packages:
       name: csslib
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.14.3"
+    version: "0.14.4"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -381,5 +381,5 @@ packages:
     source: hosted
     version: "2.1.13"
 sdks:
-  dart: ">=2.0.0-dev.52.0 <=2.0.0-edge.af1436931b93e755d38223c487d33a0a1f5eadf5"
+  dart: ">=2.0.0-dev.52.0 <=2.0.0-dev.54.0.flutter-46ab040e58"
   flutter: ">=0.1.4 <2.0.0"