update example to 2.0.0 (#29)

Author: kevin-sakemaer

example/lib/main.dart

@@ -97,7 +97,10 @@ class _ScanPageState extends State<ScanPage> {
             },
             detector: FirebaseVision.instance.barcodeDetector().detectInImage,
             onResult: (List<Barcode> barcodes) {
-              if (!mounted || resultSent) {
+              if (!mounted ||
+                  resultSent ||
+                  barcodes == null ||
+                  barcodes.isEmpty) {
                 return;
               }
               resultSent = true;

example/lib/main_live.dart

@@ -43,7 +43,10 @@ class _MyHomePageState extends State<MyHomePage> {
             key: _scanKey,
             detector: FirebaseVision.instance.barcodeDetector().detectInImage,
             onResult: (barcodes) {
-              if (data.contains(barcodes.first.displayValue) || !mounted) {
+              if (barcodes == null ||
+                  barcodes.isEmpty ||
+                  data.contains(barcodes.first.displayValue) ||
+                  !mounted) {
                 return;
               }
               setState(() {

example/pubspec.lock

@@ -70,7 +70,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "1.5.1"
+    version: "2.0.0"
   flutter_test:
     dependency: "direct dev"
     description: flutter