Finished storing/retrieving

eight_queens/lib/main.dart

@@ -66,7 +66,7 @@ class _MyHomePageState extends State<MyHomePage> {
     });
     await pr.show();
     await QueenResolver().solve(_boardSize);
-    await pr.dismiss();
+    pr.dismiss();
 
     Navigator.push(context, MaterialPageRoute(builder: (context) => ResultsPage(title: "Results")));
   }

eight_queens/lib/queens.dart

@@ -3,7 +3,7 @@
  * Solved using algorithm found in: https://www.geeksforgeeks.org/n-queen-problem-using-branch-and-bound/
  */
 
-import "dart:io";
+import 'package:shared_preferences/shared_preferences.dart';
 
 class QueenResolver {
 
@@ -58,7 +58,7 @@ class QueenResolver {
     return res;
   }
 
-  void _storeSolution(List<List<int>> board) {
+  _storeSolution(List<List<int>> board) async {
     for(int i = 0; i < board.length; i++) {
       for(int x = 0; x < board[i].length ; x++) {
         if(board[i][x] == null) {
@@ -68,15 +68,23 @@ class QueenResolver {
     }
 
     boards.add(board);
+    await _saveToLocalStorage();
   }
 
+  Future<bool> _saveToLocalStorage() async {
+    SharedPreferences.setMockInitialValues({});
+    final prefs = await SharedPreferences.getInstance();
+    prefs.setString('result', boards.toString());
+  }
+
+
+
 
   Future<bool> solve(int n) async {
     // Create the initial queens board
      List<List<int>> board = new List.generate(n, (_) => new List(n));
 
     if(await _solveQueens(board,0,n) == false) {
-      print("found solutions: "+boards.length.toString());
       return false;
     }
     return true;

eight_queens/lib/results.dart

@@ -1,5 +1,7 @@
 
 import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'dart:convert';
 
 class ResultsPage extends StatefulWidget {
   ResultsPage({Key key, this.title}) : super(key: key);
@@ -10,21 +12,36 @@ class ResultsPage extends StatefulWidget {
 }
 
 class _ResultsPageState extends State<ResultsPage> {
+  var boards;
+
+  Future retrieveEightQueensResults() async {
+    final prefs = await SharedPreferences.getInstance();
+    String boardsString = await prefs.get('result');
+    setState(() {
+      boards = jsonDecode(boardsString);
+    });
+  }
+
+  @override
+  void initState() {
+    retrieveEightQueensResults().then((value) {
+      print('async done');
+    });
+    super.initState();
+  }
 
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
         title: Text(widget.title),
       ),
-      body: Center(
-        child: Column(
-          mainAxisAlignment: MainAxisAlignment.center,
-          children: <Widget>[
-            Text("results")
-          ],
-        ),
-      ),
+      body: new ListView.builder(
+        itemCount: boards.length,
+        itemBuilder: (BuildContext context, int index) {
+          return new Text(boards[index].toString());
+        },
+      )
     );
   }
 }

eight_queens/pubspec.yaml

@@ -19,6 +19,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  shared_preferences : ^0.5.6
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.