Committed modified sample.

Author: SriramKiranSenthilkumar

android/gradle.properties

@@ -1,5 +1,3 @@
 org.gradle.jvmargs=-Xmx1536M
-org.gradle.java.home=C:\\Program Files\\Java\\jdk1.8.0_144
-android.enableR8=true
 android.useAndroidX=true
 android.enableJetifier=true

assets/data.json

@@ -1,22 +1,22 @@
 [
         {
-            "year": "Jan",
+            "month": "Jan",
             "sales": 35.0
         },
         {
-            "year": "Feb",
+            "month": "Feb",
             "sales": 28.0
         },
         {
-            "year": "Mar",
+            "month": "Mar",
             "sales": 34.0
         },
         {
-            "year": "Apr",
+            "month": "Apr",
             "sales": 32.0
         },
         {
-            "year": "May",
+            "month": "May",
             "sales": 40.0
         }
 ]

lib/main.dart

@@ -30,13 +30,17 @@ class _MyHomePageState extends State<MyHomePage> {
   List<SalesData> chartData = [];
 
   Future loadSalesData() async {
-    String jsonString = await rootBundle.loadString('assets/data.json');
-    final dynamic jsonResponse = json.decode(jsonString);
+    String jsonString = await getJsonFromAssets();
+    final jsonResponse = json.decode(jsonString);
     for (Map<String, dynamic> i in jsonResponse) {
       chartData.add(SalesData.fromJson(i));
     }
   }
 
+  Future<String> getJsonFromAssets() async {
+    return await rootBundle.loadString('assets/data.json');
+  }
+
   @override
   void initState() {
     super.initState();
@@ -50,9 +54,10 @@ class _MyHomePageState extends State<MyHomePage> {
         ),
         body: Center(
             child: FutureBuilder(
-                future: loadSalesData(),
+                future: getJsonFromAssets(),
                 builder: (context, snapshot) {
-                  if (chartData.isNotEmpty) {
+                  loadSalesData();
+                  if (snapshot.hasData) {
                     return SfCartesianChart(
                         primaryXAxis: CategoryAxis(),
                         // Chart title