{"id":1295,"date":"2025-05-19T17:32:38","date_gmt":"2025-05-19T08:32:38","guid":{"rendered":"https:\/\/itstudy365.com\/blog\/?p=1295"},"modified":"2025-05-27T21:58:25","modified_gmt":"2025-05-27T12:58:25","slug":"android-application-development-%e7%ac%ac19%e7%ab%a0%ef%bc%9ajson%e3%83%91%e3%83%bc%e3%82%b9%ef%bc%88gson%ef%bc%89","status":"publish","type":"post","link":"https:\/\/itstudy365.com\/blog\/2025\/05\/19\/android-application-development-%e7%ac%ac19%e7%ab%a0%ef%bc%9ajson%e3%83%91%e3%83%bc%e3%82%b9%ef%bc%88gson%ef%bc%89\/","title":{"rendered":"Android application development \u7b2c19\u7ae0\uff1aJSON\u30d1\u30fc\u30b9\uff08Gson\uff09"},"content":{"rendered":"\n<button id=\"bb1\" type=\"button\" value=\"Play\" class=\"responsivevoice-button\" title=\"ResponsiveVoice Tap to Start\/Stop Speech\"><span>&#128266; Play<\/span><\/button>\n        <script>\n            bb1.onclick = function(){\n                if(responsiveVoice.isPlaying()){\n                    responsiveVoice.cancel();\n                }else{\n                    responsiveVoice.speak(\"\ud83e\uddfe Gson\u3068\u306f\uff1f Gson\uff08Google\u306eJSON\u30e9\u30a4\u30d6\u30e9\u30ea\uff09\u306f\u3001JSON \u2194 Java\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 \u3092\u7c21\u5358\u30fb\u5b89\u5168\u30fb\u9ad8\u901f\u306b\u5909\u63db\u3057\u3066\u304f\u308c\u308b\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u3059\u3002 Java\u3067 toJson() \u3084 fromJson() \u3068\u3044\u3063\u305f\u76f4\u611f\u7684\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u3001\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 \u2192 JSON\uff09\u3001\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\uff08JSON \u2192 \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09\u304c\u3067\u304d\u307e\u3059\u3002 \ud83d\udce6 Gradle\u3067\u306e\u5c0e\u5165 dependencies { implementation &#39;com.google.code.gson:gson:2.10.1&#39; } \ud83d\udd04 \u57fa\u672c\u306e\u4f7f\u3044\u65b9 \u2460 Java\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 \u2192 JSON \u3078\u5909\u63db\uff08\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\uff09 class User { String name; int age; } User user = new User(); user.name = \\\"Taro\\\"; user.age = 25; Gson gson = new Gson(); String json = gson.toJson(user); \/\/ {\\\"name\\\":\\\"Taro\\\",\\\"age\\\":25} \u2461 JSON \u2192 Java\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 \u3078\u5909\u63db\uff08\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\uff09 String json = \\\"{\\\"name\\\":\\\"Taro\\\",\\\"age\\\":25}\\\"; Gson gson = new Gson(); User user = gson.fromJson(json, User.class); System.out.println(user.name); \/\/ \\\"Taro\\\" System.out.println(user.age); \/\/ 25 fromJson() \u30e1\u30bd\u30c3\u30c9\u306b JSON\u6587\u5b57\u5217\u3068 \u5bfe\u5fdc\u3059\u308b\u30af\u30e9\u30b9 \u3092\u6e21\u3059\u3060\u3051\u3067OK\uff01 \ud83d\udca1 \u7279\u5fb4\u3068\u4fbf\u5229\u306a\u70b9 \u7279\u5fb4\u8aac\u660e\u2460 \u975e\u5e38\u306b\u8efd\u91cf\u3067\u901f\u3044Android\u5411\u3051\u306b\u6700\u9069\u5316\u3055\u308c\u3066\u3044\u308b\u2461 \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3067\u5236\u5fa1\u3067\u304d\u308b@SerializedName \u306a\u3069\u3067\u67d4\u8edf\u306b\u30de\u30c3\u30d4\u30f3\u30b0\u53ef\u80fd\u2462 List \u3084 Map \u306e\u5909\u63db\u3082\u7c21\u5358\u578b\u4ed8\u304d\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u3082\u5bfe\u5fdc\u2463 Retrofit\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u304c\u591a\u3044Web API\u901a\u4fe1 \u2192 \u81ea\u52d5\u3067Java\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u3067\u304d\u308b \ud83d\udd24 JSON\u30ad\u30fc\u3068Java\u30d5\u30a3\u30fc\u30eb\u30c9\u540d\u304c\u7570\u306a\u308b\u3068\u304d class User { @SerializedName(\\\"user_name\\\") String name; @SerializedName(\\\"user_age\\\") int age; } JSON: { \\\"user_name\\\": \\\"Taro\\\", \\\"user_age\\\": 25 } @SerializedName \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u3048\u3070\u3001JSON\u30ad\u30fc\u3068Java\u30d5\u30a3\u30fc\u30eb\u30c9\u540d\u304c\u9055\u3063\u3066\u3044\u3066\u3082OK\uff01 \ud83d\udd01 List \u3084 Map \u306e\u5909\u63db String json = \\\"[{\\\"name\\\":\\\"Taro\\\",\\\"age\\\":25},{\\\"name\\\":\\\"Hanako\\\",\\\"age\\\":30}]\\\"; Type userListType = new TypeTokenless thanListless thanUsergreater thangreater than(){}.getType(); Listless thanUsergreater than users = gson.fromJson(json, userListType); \u203b Java\u306e\u578b\u60c5\u5831\u306f\u578b\u6d88\u53bb\u3055\u308c\u3066\u3057\u307e\u3046\u305f\u3081\u3001TypeToken \u3092\u4f7f\u3063\u3066\u660e\u793a\u7684\u306b\u578b\u3092\u6e21\u3057\u307e\u3059\u3002 \u26a0\ufe0f \u6ce8\u610f\u70b9 \u6ce8\u610f\u70b9\u8aac\u660eprivate\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u7121\u8996\u3055\u308c\u308b\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f public \u3084 package-private \u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u307f\u5bfe\u8c61\u30c7\u30d5\u30a9\u30eb\u30c8\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u5fc5\u8981new \u3057\u3066\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u5024\u3092\u5165\u308c\u308b\u305f\u3081\u3001\u7a7a\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u5fc5\u8981\u3067\u3059\u65e5\u4ed8\u3084\u6642\u523b\u306e\u6271\u3044\u306b\u6ce8\u610fJava 8\u4ee5\u964d\u306e LocalDateTime \u306a\u3069\u306f\u5c11\u3057\u5de5\u592b\u304c\u5fc5\u8981\u3067\u3059 \u2705 \u307e\u3068\u3081 Gson\u306f\u3053\u3093\u306a\u3068\u304d\u306b\u4fbf\u5229\uff01\u2705 Web API\u306eJSON\u30ec\u30b9\u30dd\u30f3\u30b9\u3092Java\u306b\u5909\u63db\u3057\u305f\u3044\u3068\u304d\u2705 \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5185\u5bb9\u3092\u30ed\u30b0\u3068\u3057\u3066\u51fa\u529b\u3057\u305f\u3044\u3068\u304d\u2705 \u30d5\u30a1\u30a4\u30eb\u4fdd\u5b58\u3084\u30ad\u30e3\u30c3\u30b7\u30e5\u7528\u9014\u3067JSON\u5f62\u5f0f\u306b\u3057\u305f\u3044\u3068\u304d\", \"Japanese Female\");\n                }\n            };\n        <\/script>\n    <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83e\uddfe Gson\u3068\u306f\uff1f<\/h2>\n\n\n\n<p><strong>Gson\uff08Google\u306eJSON\u30e9\u30a4\u30d6\u30e9\u30ea\uff09\u306f\u3001<br>JSON \u2194 Java\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 \u3092\u7c21\u5358\u30fb\u5b89\u5168\u30fb\u9ad8\u901f<\/strong>\u306b\u5909\u63db\u3057\u3066\u304f\u308c\u308b\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u3059\u3002<\/p>\n\n\n\n<p>Java\u3067 <code>toJson()<\/code> \u3084 <code>fromJson()<\/code> \u3068\u3044\u3063\u305f\u76f4\u611f\u7684\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u3001<br>\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 \u2192 JSON\uff09\u3001\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\uff08JSON \u2192 \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udce6 Gradle\u3067\u306e\u5c0e\u5165<\/h2>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-scss\" data-lang=\"SCSS\"><code>dependencies {\n    implementation &#39;com.google.code.gson:gson:2.10.1&#39;\n}<\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd04 \u57fa\u672c\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u2460 Java\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 \u2192 JSON \u3078\u5909\u63db\uff08\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\uff09<\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-csharp\" data-lang=\"C#\" data-show-lang=\"0\"><code>class User {\n    String name;\n    int age;\n}\n\nUser user = new User();\nuser.name = &quot;Taro&quot;;\nuser.age = 25;\n\nGson gson = new Gson();\nString json = gson.toJson(user);  \/\/ {&quot;name&quot;:&quot;Taro&quot;,&quot;age&quot;:25}<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">\u2461 JSON \u2192 Java\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 \u3078\u5909\u63db\uff08\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\uff09<\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-csharp\" data-lang=\"C#\" data-show-lang=\"0\"><code>String json = &quot;{\\&quot;name\\&quot;:\\&quot;Taro\\&quot;,\\&quot;age\\&quot;:25}&quot;;\n\nGson gson = new Gson();\nUser user = gson.fromJson(json, User.class);\n\nSystem.out.println(user.name);  \/\/ &quot;Taro&quot;\nSystem.out.println(user.age);   \/\/ 25<\/code><\/pre><\/div>\n\n\n\n<blockquote class=\"wp-block-quote\">\n<p><code>fromJson()<\/code> \u30e1\u30bd\u30c3\u30c9\u306b JSON\u6587\u5b57\u5217\u3068 \u5bfe\u5fdc\u3059\u308b\u30af\u30e9\u30b9 \u3092\u6e21\u3059\u3060\u3051\u3067OK\uff01<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udca1 \u7279\u5fb4\u3068\u4fbf\u5229\u306a\u70b9<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u7279\u5fb4<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>\u2460 \u975e\u5e38\u306b\u8efd\u91cf\u3067\u901f\u3044<\/td><td>Android\u5411\u3051\u306b\u6700\u9069\u5316\u3055\u308c\u3066\u3044\u308b<\/td><\/tr><tr><td>\u2461 \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3067\u5236\u5fa1\u3067\u304d\u308b<\/td><td><code>@SerializedName<\/code> \u306a\u3069\u3067\u67d4\u8edf\u306b\u30de\u30c3\u30d4\u30f3\u30b0\u53ef\u80fd<\/td><\/tr><tr><td>\u2462 List \u3084 Map \u306e\u5909\u63db\u3082\u7c21\u5358<\/td><td>\u578b\u4ed8\u304d\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u3082\u5bfe\u5fdc<\/td><\/tr><tr><td>\u2463 Retrofit\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u304c\u591a\u3044<\/td><td>Web API\u901a\u4fe1 \u2192 \u81ea\u52d5\u3067Java\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u3067\u304d\u308b<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd24 JSON\u30ad\u30fc\u3068Java\u30d5\u30a3\u30fc\u30eb\u30c9\u540d\u304c\u7570\u306a\u308b\u3068\u304d<\/h2>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-csharp\" data-lang=\"C#\" data-show-lang=\"0\"><code>class User {\n    @SerializedName(&quot;user_name&quot;)\n    String name;\n\n    @SerializedName(&quot;user_age&quot;)\n    int age;\n}<\/code><\/pre><\/div>\n\n\n\n<p>JSON:<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-json\" data-lang=\"JSON\" data-show-lang=\"0\"><code>{\n  &quot;user_name&quot;: &quot;Taro&quot;,\n  &quot;user_age&quot;: 25\n}<\/code><\/pre><\/div>\n\n\n\n<blockquote class=\"wp-block-quote\">\n<p><code>@SerializedName<\/code> \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u3048\u3070\u3001JSON\u30ad\u30fc\u3068Java\u30d5\u30a3\u30fc\u30eb\u30c9\u540d\u304c\u9055\u3063\u3066\u3044\u3066\u3082OK\uff01<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd01 List \u3084 Map \u306e\u5909\u63db<\/h2>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-csharp\" data-lang=\"C#\" data-show-lang=\"0\"><code>String json = &quot;[{\\&quot;name\\&quot;:\\&quot;Taro\\&quot;,\\&quot;age\\&quot;:25},{\\&quot;name\\&quot;:\\&quot;Hanako\\&quot;,\\&quot;age\\&quot;:30}]&quot;;\n\nType userListType = new TypeToken&lt;List&lt;User&gt;&gt;(){}.getType();\nList&lt;User&gt; users = gson.fromJson(json, userListType);<\/code><\/pre><\/div>\n\n\n\n<p>\u203b Java\u306e\u578b\u60c5\u5831\u306f\u578b\u6d88\u53bb\u3055\u308c\u3066\u3057\u307e\u3046\u305f\u3081\u3001<code>TypeToken<\/code> \u3092\u4f7f\u3063\u3066\u660e\u793a\u7684\u306b\u578b\u3092\u6e21\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u26a0\ufe0f \u6ce8\u610f\u70b9<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u6ce8\u610f\u70b9<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>private\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u7121\u8996\u3055\u308c\u308b<\/td><td>\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f public \u3084 package-private \u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u307f\u5bfe\u8c61<\/td><\/tr><tr><td>\u30c7\u30d5\u30a9\u30eb\u30c8\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u5fc5\u8981<\/td><td><code>new<\/code> \u3057\u3066\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u5024\u3092\u5165\u308c\u308b\u305f\u3081\u3001\u7a7a\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u5fc5\u8981\u3067\u3059<\/td><\/tr><tr><td>\u65e5\u4ed8\u3084\u6642\u523b\u306e\u6271\u3044\u306b\u6ce8\u610f<\/td><td>Java 8\u4ee5\u964d\u306e <code>LocalDateTime<\/code> \u306a\u3069\u306f\u5c11\u3057\u5de5\u592b\u304c\u5fc5\u8981\u3067\u3059<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u2705 \u307e\u3068\u3081<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Gson\u306f\u3053\u3093\u306a\u3068\u304d\u306b\u4fbf\u5229\uff01<\/th><\/tr><\/thead><tbody><tr><td>\u2705 Web API\u306eJSON\u30ec\u30b9\u30dd\u30f3\u30b9\u3092Java\u306b\u5909\u63db\u3057\u305f\u3044\u3068\u304d<\/td><\/tr><tr><td>\u2705 \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5185\u5bb9\u3092\u30ed\u30b0\u3068\u3057\u3066\u51fa\u529b\u3057\u305f\u3044\u3068\u304d<\/td><\/tr><tr><td>\u2705 \u30d5\u30a1\u30a4\u30eb\u4fdd\u5b58\u3084\u30ad\u30e3\u30c3\u30b7\u30e5\u7528\u9014\u3067JSON\u5f62\u5f0f\u306b\u3057\u305f\u3044\u3068\u304d<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[54],"_links":{"self":[{"href":"https:\/\/itstudy365.com\/blog\/wp-json\/wp\/v2\/posts\/1295"}],"collection":[{"href":"https:\/\/itstudy365.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itstudy365.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itstudy365.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itstudy365.com\/blog\/wp-json\/wp\/v2\/comments?post=1295"}],"version-history":[{"count":2,"href":"https:\/\/itstudy365.com\/blog\/wp-json\/wp\/v2\/posts\/1295\/revisions"}],"predecessor-version":[{"id":1402,"href":"https:\/\/itstudy365.com\/blog\/wp-json\/wp\/v2\/posts\/1295\/revisions\/1402"}],"wp:attachment":[{"href":"https:\/\/itstudy365.com\/blog\/wp-json\/wp\/v2\/media?parent=1295"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itstudy365.com\/blog\/wp-json\/wp\/v2\/categories?post=1295"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itstudy365.com\/blog\/wp-json\/wp\/v2\/tags?post=1295"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}