猜数字配置存储

lib/guess/guess_page.dart

@@ -2,6 +2,7 @@ import 'dart:math';
 
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import 'package:flutter_first_station/storage/sp_storage.dart';
 import 'guess_app_bar.dart';
 import 'result_notice.dart';
 
@@ -23,11 +24,21 @@ class _GuessPageState extends State<GuessPage> with SingleTickerProviderStateMix
       vsync: this,
       duration: const Duration(milliseconds: 200),
     );
+    _initConfig();
+  }
+
+  void _initConfig() async{
+    Map<String,dynamic> config = await SpStorage.instance.readGuessConfig();
+    _guessing = config['guessing']??false;
+    _value = config['value']??0;
+    setState(() {
+
+    });
   }
 
   int _value = 0;
 
-  Random _random = Random();
+  final Random _random = Random();
   bool _guessing = false;
   bool? _isBig;
 
@@ -43,6 +54,7 @@ class _GuessPageState extends State<GuessPage> with SingleTickerProviderStateMix
     setState(() {
       _guessing = true;
       _value = _random.nextInt(100);
+      SpStorage.instance.saveGuessConfig(guessing: _guessing,value: _value);
       print(_value);
     });
   }
@@ -60,6 +72,7 @@ class _GuessPageState extends State<GuessPage> with SingleTickerProviderStateMix
       setState(() {
         _isBig = null;
         _guessing = false;
+        SpStorage.instance.saveGuessConfig(guessing: _guessing,value: _value);
       });
       return;
     }
@@ -116,5 +129,8 @@ class _GuessPageState extends State<GuessPage> with SingleTickerProviderStateMix
   }
 
   @override
+  // TODO: implement wantKeepAlive
   bool get wantKeepAlive => true;
+
+
 }

lib/storage/sp_storage.dart

@@ -0,0 +1,39 @@
+import 'dart:convert';
+
+import 'package:shared_preferences/shared_preferences.dart';
+
+const String kGuessSpKey = 'guess-config';
+
+class SpStorage {
+  SpStorage._();
+
+  static SpStorage? _storage;
+
+  static SpStorage get instance {
+    _storage = _storage ?? SpStorage._();
+    return _storage!;
+  }
+
+  SharedPreferences? _sp;
+
+  Future<void> initSpWhenNull() async {
+    if (_sp != null) return;
+    _sp = _sp ?? await SharedPreferences.getInstance();
+  }
+
+  Future<bool> saveGuessConfig({
+    bool? guessing,
+    int? value,
+  }) async {
+    await initSpWhenNull();
+    String content = json.encode({'guessing': guessing, 'value': value});
+    return _sp!.setString(kGuessSpKey, content);
+  }
+
+  Future<Map<String,dynamic>> readGuessConfig() async {
+    await initSpWhenNull();
+    String content = _sp!.getString(kGuessSpKey)??"{}";
+    return json.decode(content);
+  }
+
+}