Guard for System Error

android/app/src/main/AndroidManifest.xml

@@ -4,6 +4,8 @@
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <!-- io.flutter.app.FlutterApplication is an android.app.Application that
          calls FlutterMain.startInitialization(this); in its onCreate method.
          In most cases you can leave this as-is, but you if you want to provide

lib/config.dart

@@ -1,4 +1,4 @@
 class Config {
   static const String api = "http://192.168.1.7:8080";
-  static const bool dynamicHostSetting = false;
+  static const bool dynamicHostSetting = true;
 }

lib/model/response.dart

@@ -1,4 +1,6 @@
 class ResponseModel {
+  final String errorMessage = "error";
+
   String status;
 
   ResponseModel({this.status});
@@ -8,7 +10,11 @@ class ResponseModel {
   }
 
   ResponseModel.fromNull() {
-    status = "Error";
+    status = errorMessage;
+  }
+
+  isError() {
+    return (status == errorMessage);
   }
 
   Map<String, dynamic> toJson() {

lib/page/map.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 
 import 'package:background_location/background_location.dart';
 import 'package:flutter/material.dart';
+import 'package:fluttertoast/fluttertoast.dart';
 import 'package:geo_app/bloc/position_bloc.dart';
 import 'package:geo_app/bloc/setting.dart';
 import 'package:geo_app/model/position.dart';
@@ -58,14 +59,18 @@ class _MapState extends State<Map> {
       this.host = settingModel.host;
 
       if (settingModel.isNullId()) {
-        Navigator.of(context).pushReplacement(new MaterialPageRoute(
+        settingPage();
-          builder: (BuildContext context) => Setting(),
-        ));
       }
 
       if (this.host != null && this.host != "") {
         setState(() {
           _positionBloc = new PositionBloc(settingModel);
+          _positionBloc.subject.listen((position) {
+            if (position.isError()) {
+              BackgroundLocation.stopLocationService();
+              settingPage();
+            }
+          });
         });
       }
     });
@@ -94,23 +99,21 @@ class _MapState extends State<Map> {
         );
       } else {
         BackgroundLocation.stopLocationService();
-        Navigator.of(context).pushReplacement(new MaterialPageRoute(
+        settingPage();
-          builder: (BuildContext context) => Setting(),
-        ));
       }
 
       if (this._position != null) {
         if (this._position.isValid()) {
-          print("Valid Position");
           if (_positionBloc != null) {
-            print("Send Position " +
-                this._position.lat.toString() +
-                ", " +
-                this._position.lng.toString());
             _positionBloc.sendPosition(
               this._position.lat.toString(),
               this._position.lng.toString(),
             );
+          } else {
+            Fluttertoast.showToast(
+              msg: "Failed to start position service",
+            );
+            settingPage();
           }
         } else {
           print("Invalid Position");
@@ -173,10 +176,18 @@ class _MapState extends State<Map> {
         isTracking = !isTracking;
       });
     } else {
-      print("Access Denied");
+      Fluttertoast.showToast(
+        msg: "Make sure you have turn on location services",
+      );
     }
   }
 
+  settingPage() {
+    Navigator.of(context).pushReplacement(new MaterialPageRoute(
+      builder: (BuildContext context) => Setting(),
+    ));
+  }
+
   @override
   void dispose() {
     print("Disposed");

lib/page/setting.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
+import 'package:fluttertoast/fluttertoast.dart';
 import 'package:geo_app/bloc/setting.dart';
 import 'package:geo_app/bloc/unique_id_bloc.dart';
 import 'package:geo_app/config.dart';
@@ -40,32 +41,38 @@ class _SettingState extends State<Setting> {
 
       _hostController.text = this.host;
 
-      if (settingModel.isNullId()) {
+      if (!settingModel.isNullHost()) {
-        print("Requesting Unique ID");
         _uniqueIDBloc = new UniqueIDBloc(settingModel);
         _uniqueIDBloc.getUniqueID();
-      }
 
-      if (_uniqueIDBloc != null) {
+        if (_uniqueIDBloc != null) {
-        this._uniqueIDBloc.subject.listen((uniqueId) {
+          this._uniqueIDBloc.subject.listen((uniqueId) {
-          print("Your Unique ID " + uniqueId.id.toString());
+            print("Your Unique ID " + uniqueId.id.toString());
-          if (uniqueId.id != null && uniqueId.id != "") {
+            if (uniqueId.id != null && uniqueId.id != "") {
-            if (!settingModel.isNullId()) {
+              if (!settingModel.isNullId()) {
-              Navigator.of(context).pushReplacement(new MaterialPageRoute(
+                mapPage();
-                builder: (BuildContext context) => Map(),
+              } else {
-              ));
+                this._settingBloc.setSetting(
+                      new SettingModel(this._hostController.text, uniqueId.id),
+                    );
+                mapPage();
+              }
             } else {
-              this._settingBloc.setSetting(
+              Fluttertoast.showToast(msg: "Invalid host address");
-                    new SettingModel(this._hostController.text, uniqueId.id),
-                  );
             }
-          }
+          });
-        });
+        }
       }
     });
     super.initState();
   }
 
+  mapPage() {
+    Navigator.of(context).pushReplacement(new MaterialPageRoute(
+      builder: (BuildContext context) => Map(),
+    ));
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -92,13 +99,23 @@ class _SettingState extends State<Setting> {
                     border: OutlineInputBorder(),
                   ),
                 ),
-                FlatButton(
+                SizedBox(
-                  onPressed: () {
+                  height: 10.0,
-                    this._settingBloc.setSetting(
+                ),
-                          new SettingModel(this._hostController.text, null),
+                Container(
-                        );
+                  width: double.infinity,
-                  },
+                  child: FlatButton(
-                  child: Text("Save"),
+                    color: Colors.blueAccent,
+                    onPressed: () {
+                      this._settingBloc.setSetting(
+                            new SettingModel(this._hostController.text, null),
+                          );
+                    },
+                    child: Text(
+                      "Save",
+                      style: TextStyle(color: Colors.white),
+                    ),
+                  ),
                 )
               ],
             ),

lib/provider/position_provider.dart

@@ -23,8 +23,12 @@ class PositionProvider {
       );
       return ResponseModel.fromJson(response.data);
     } on DioError catch (e) {
-      print(e);
+      print(e.response);
-      return ResponseModel.fromJson(e.response.data);
+      if (e.response != null) {
+        return ResponseModel.fromJson(e.response.data);
+      } else {
+        return ResponseModel.fromNull();
+      }
     }
   }
 

pubspec.lock

@@ -149,6 +149,13 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  fluttertoast:
+    dependency: "direct main"
+    description:
+      name: fluttertoast
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.1.3"
   glob:
     dependency: transitive
     description:

pubspec.yaml

@@ -31,6 +31,7 @@ dependencies:
   shared_preferences: ^0.5.6
   rxdart: ^0.23.1
   dio: ^3.0.7
+  fluttertoast: ^3.1.3
 
 dev_dependencies:
   flutter_test: