{"id":796,"date":"2020-05-16T12:26:45","date_gmt":"2020-05-16T03:26:45","guid":{"rendered":"http:\/\/www.typea.info\/blog\/?p=796"},"modified":"2020-05-16T12:26:47","modified_gmt":"2020-05-16T03:26:47","slug":"flutter-sharedpreferences","status":"publish","type":"post","link":"https:\/\/www.typea.info\/blog\/index.php\/2020\/05\/16\/flutter-sharedpreferences\/","title":{"rendered":"Flutter : SharedPreferences\u3092\u4f7f\u3063\u3066\u8a2d\u5b9a\u753b\u9762\u3092\u4f5c\u6210\u3059\u308b"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/pub.dev\/packages\/shared_preferences\">https:\/\/pub.dev\/packages\/shared_preferences<\/a> \u3092\u4f7f\u7528\u3057\u3066\u3001Flutter\u306b\u8a2d\u5b9a\u753b\u9762\u3092\u4f5c\u6210\u3059\u308b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Switch Widget\u306e\u5024\u3092\u4fdd\u5b58\u3001\u8868\u793a\u3055\u305b\u308b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/zh4h50tO7n0\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe>\n\n\n\n<p class=\"wp-block-paragraph\">\u30bd\u30fc\u30b9\u3002<\/p>\n\n\n\n<pre class=\"prettyprint\">import 'package:flutter\/cupertino.dart';\nimport 'package:flutter\/material.dart';\nimport 'package:shared_preferences\/shared_preferences.dart';\n\nimport '..\/..\/resources\/string.dart' as SR;\n\nclass SettingsPage extends StatefulWidget {\n  @override\n  State&lt;StatefulWidget&gt; createState() =&gt; SettingsPageState();\n}\n\nclass SettingsPageState extends State&lt;SettingsPage&gt; {\n  static const switch_default_value = false;\n  static const switch_key = \"test_switch\";\n\n  SharedPreferences _prefs;\n  bool _switchValue = switch_default_value;\n\n  @override\n  void initState() {\n    _initPreferences();\n    super.initState();\n  }\n\n  void _initPreferences() {\n    SharedPreferences.getInstance().then((value){\n      _prefs = value;\n\n      setState(() {\n        _switchValue = _prefs.getBool(switch_key) ?? switch_default_value;\n      });\n    });\n  }\n\n  @override\n  Widget build(BuildContext context) {\n    return Scaffold(\n      appBar: AppBar(\n        title: const Text(SR.page_title_settings),\n      ),\n      body: Column(\n        children: &lt;Widget&gt;[\n          Switch(\n              onChanged: switchChanged,\n              value:_switchValue,\n          ),\n        ],\n      ),\n    );\n  }\n  void switchChanged(bool value) {\n    _prefs.setBool(switch_key, value);\n  }\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/amzn.to\/36aCdoL\">GCP \u306e\u30a2\u30a6\u30c8\u30e9\u30a4\u30f3\u3092\u63b4\u307f\u3064\u3064\u3001\u6280\u8853\u8996\u70b9\u306e\u30d0\u30e9\u30f3\u30b9\u3082\u53d6\u308c\u3066\u3044\u3066\u6709\u7528<\/a>\u3002<\/p>\n\n\n\n<a href=\"https:\/\/www.amazon.co.jp\/Google-Cloud-Platform-%E3%82%A8%E3%83%B3%E3%82%BF%E3%83%BC%E3%83%97%E3%83%A9%E3%82%A4%E3%82%BA%E8%A8%AD%E8%A8%88%E3%82%AC%E3%82%A4%E3%83%89-%E9%81%A0%E5%B1%B1-%E9%99%BD%E4%BB%8B-ebook\/dp\/B07C85YMCW\/ref=as_li_ss_il?__mk_ja_JP=%E3%82%AB%E3%82%BF%E3%82%AB%E3%83%8A&#038;crid=3JS6LBTTIJ8O0&#038;dchild=1&#038;keywords=google+cloud+platform&#038;qid=1589599365&#038;sprefix=Google+Cloud,aps,263&#038;sr=8-2&#038;linkCode=li2&#038;tag=typea09-22&#038;linkId=2adb4e29e301711dfdec002cb9f58577&#038;language=ja_JP\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" border=\"0\" src=\"\/\/ws-fe.amazon-adsystem.com\/widgets\/q?_encoding=UTF8&#038;ASIN=B07C85YMCW&#038;Format=_SL160_&#038;ID=AsinImage&#038;MarketPlace=JP&#038;ServiceVersion=20070822&#038;WS=1&#038;tag=typea09-22&#038;language=ja_JP\" ><\/a><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ir-jp.amazon-adsystem.com\/e\/ir?t=typea09-22&#038;language=ja_JP&#038;l=li2&#038;o=9&#038;a=B07C85YMCW\" width=\"1\" height=\"1\" border=\"0\" alt=\"\" style=\"border:none !important; margin:0px !important;\" \/>\n","protected":false},"excerpt":{"rendered":"<p>https:\/\/pub.dev\/packages\/shared_preferences \u3092\u4f7f\u7528\u3057\u3066\u3001Flutter\u306b\u8a2d\u5b9a\u753b\u9762\u3092\u4f5c\u6210\u3059\u308b\u3002 Switch Widget\u306e\u5024\u3092\u4fdd\u5b58\u3001\u8868\u793a\u3055\u305b\u308b\u3002 \u30bd\u30fc\u30b9\u3002 import &#8216;pa [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"sns_share_botton_hide":"","vkExUnit_sns_title":"","_vk_print_noindex":"","sitemap_hide":"","_veu_custom_css":"","veu_display_promotion_alert":"","vkexunit_cta_each_option":"","footnotes":""},"categories":[111],"tags":[],"class_list":["post-796","post","type-post","status-publish","format-standard","hentry","category-flutter"],"veu_head_title_object":{"title":"","add_site_title":""},"_links":{"self":[{"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/posts\/796","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/comments?post=796"}],"version-history":[{"count":1,"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/posts\/796\/revisions"}],"predecessor-version":[{"id":797,"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/posts\/796\/revisions\/797"}],"wp:attachment":[{"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/media?parent=796"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/categories?post=796"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.typea.info\/blog\/index.php\/wp-json\/wp\/v2\/tags?post=796"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}