Remove floating action button

lib/api.dart

@@ -262,12 +262,7 @@ class InvenTreeAPI {
 
     response = await get("", expectedStatusCode: 200);
 
-    // Response was invalid for some reason
-    if (!response.isValid()) {
-      return false;
-    }
-
-    if (response.statusCode != 200) {
+    if (!response.successful()) {
       showStatusCodeError(response.statusCode);
       return false;
     }
@@ -319,11 +314,7 @@ class InvenTreeAPI {
     response = await get(_URL_GET_TOKEN);
 
     // Invalid response
-    if (!response.isValid()) {
-      return false;
-    }
-
-    if (response.statusCode != 200) {
+    if (!response.successful()) {
 
       switch (response.statusCode) {
         case 401:
@@ -419,7 +410,7 @@ class InvenTreeAPI {
 
     var response = await get(_URL_GET_ROLES, expectedStatusCode: 200);
 
-    if (!response.isValid() || response.statusCode != 200) {
+    if (!response.successful()) {
       return;
     }
 

lib/api_form.dart

@@ -144,7 +144,7 @@ class APIFormField {
       params: filters,
     );
 
-    if (response.isValid()) {
+    if (response.successful()) {
       initial_data = response.data;
     }
   }

lib/widget/stock_item_test_results.dart

@@ -37,6 +37,18 @@ class _StockItemTestResultDisplayState extends RefreshableState<StockItemTestRes
   @override
   String getAppBarTitle(BuildContext context) => L10().testResults;
 
+  @override
+  List<Widget> getAppBarActions(BuildContext context) {
+    return [
+      IconButton(
+          icon: FaIcon(FontAwesomeIcons.plusCircle),
+          onPressed: () {
+              addTestResult(context);
+          }
+      ),
+    ];
+  }
+
   @override
   Future<void> request() async {
     await item.getTestTemplates();
@@ -220,14 +232,4 @@ class _StockItemTestResultDisplayState extends RefreshableState<StockItemTestRes
       ).toList()
     );
   }
-
-  @override
-  Widget getFab(BuildContext context) {
-    return FloatingActionButton(
-      child: Icon(FontAwesomeIcons.plus),
-      onPressed: () {
-        addTestResult(context);
-      },
-    );
-  }
 }