{"id":1309,"date":"2025-05-22T05:49:19","date_gmt":"2025-05-21T20:49:19","guid":{"rendered":"https:\/\/itstudy365.com\/blog\/?p=1309"},"modified":"2025-05-27T22:01:15","modified_gmt":"2025-05-27T13:01:15","slug":"android-application-development-%e7%ac%ac22%e7%ab%a0%ef%bc%9amvvm%e3%82%a2%e3%83%bc%e3%82%ad%e3%83%86%e3%82%af%e3%83%81%e3%83%a3%ef%bc%88model-view-viewmodel%ef%bc%89","status":"publish","type":"post","link":"https:\/\/itstudy365.com\/blog\/2025\/05\/22\/android-application-development-%e7%ac%ac22%e7%ab%a0%ef%bc%9amvvm%e3%82%a2%e3%83%bc%e3%82%ad%e3%83%86%e3%82%af%e3%83%81%e3%83%a3%ef%bc%88model-view-viewmodel%ef%bc%89\/","title":{"rendered":"Android application development \u7b2c22\u7ae0\uff1aMVVM\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\uff08Model-View-ViewModel\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(\"\ud83d\udd27 \u306a\u305cMVVM\u3092\u4f7f\u3046\u306e\u304b\uff1f Android\u958b\u767a\u3067\u306f\u3001UI\u3068\u30ed\u30b8\u30c3\u30af\u304c\u5bc6\u7d50\u5408\u306b\u306a\u308a\u3084\u3059\u3044\u305f\u3081\u3001\u898f\u6a21\u304c\u5927\u304d\u304f\u306a\u308b\u3068\u4fdd\u5b88\u304c\u96e3\u3057\u304f\u306a\u308a\u307e\u3059\u3002 MVVM\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u60a9\u307f\u3092\u89e3\u6d88\u3057\u307e\u3059\uff1a Activity\u3084Fragment\u304c\u80a5\u5927\u5316\u3059\u308b\uff08God Class\uff09 \u30c6\u30b9\u30c8\u3057\u3065\u3089\u3044 \u518d\u5229\u7528\u6027\u304c\u4f4e\u3044 \ud83e\uddf1 MVVM\u306e3\u3064\u306e\u8981\u7d20 \u8981\u7d20\u8aac\u660eModel\u30c7\u30fc\u30bf\u3084\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u3002\u305f\u3068\u3048\u3070\u3001DB\u30a2\u30af\u30bb\u30b9\u3084API\u901a\u4fe1\u306a\u3069\u3002ViewUI\uff08Activity\u3084Fragment\uff09\u3002\u57fa\u672c\u7684\u306b\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u8868\u793a\u3068\u64cd\u4f5c\u306e\u53d7\u3051\u4ed8\u3051\u3092\u62c5\u5f53\u3002ViewModelUI\u5411\u3051\u306e\u30c7\u30fc\u30bf\u4fdd\u6301\uff06\u5909\u63db\u3002Model\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3057\u3001View\u306b\u6e21\u3059\u4e2d\u9593\u5f79\u3002UI\u306e\u30ed\u30b8\u30c3\u30af\u3082\u3053\u3053\u306b\u96c6\u7d04\u3002 \ud83d\udce6 \u69cb\u6210\u306e\u30a4\u30e1\u30fc\u30b8\uff08\u56f3\uff09 [ View (Activity \/ Fragment) ] \u2191 \u2195 DataBinding | \u2193 | [ ViewModel (UI\u72b6\u614b\u30fb\u51e6\u7406) ] \u2193 [ Model (DB\/API\u306a\u3069) ] \u2705 \u30b5\u30f3\u30d7\u30eb\uff1aTODO\u30ea\u30b9\u30c8\u98a8\u306e\u7c21\u6613\u69cb\u6210 Model\u5c64\uff08\u30c7\u30fc\u30bf\u53d6\u5f97\uff09 public class TaskRepository { public Listless thanStringgreater than getTasks() { return Arrays.asList(\\\"\u8cb7\u3044\u7269\\\", \\\"\u5bbf\u984c\\\", \\\"\u8aad\u66f8\\\"); } } ViewModel\u5c64 public class TaskViewModel extends ViewModel { private final MutableLiveDataless thanListless thanStringgreater thangreater than tasks = new MutableLiveDataless thangreater than(); private final TaskRepository repository = new TaskRepository(); public LiveDataless thanListless thanStringgreater thangreater than getTasks() { return tasks; } public void loadTasks() { tasks.setValue(repository.getTasks()); } } View\u5c64\uff08Activity\uff09 public class MainActivity extends AppCompatActivity { private TaskViewModel viewModel; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main); viewModel = new ViewModelProvider(this).get(TaskViewModel.class); binding.setViewModel(viewModel); binding.setLifecycleOwner(this); viewModel.loadTasks(); \/\/ \u30c7\u30fc\u30bf\u8aad\u307f\u8fbc\u307f } } XML\uff08activity_main.xml\uff09 less thanlayout xmlns:android=\\\"http:\/\/schemas.android.com\/apk\/res\/android\\\"greater than less thandatagreater than less thanvariable name=\\\"viewModel\\\" type=\\\"com.example.TaskViewModel\\\"\/greater than less than\/datagreater than less thanLinearLayout android:orientation=\\\"vertical\\\" android:layout_width=\\\"match_parent\\\" android:layout_height=\\\"match_parent\\\"greater than less thanTextView android:layout_width=\\\"wrap_content\\\" android:layout_height=\\\"wrap_content\\\" android:text=&#39;@{viewModel.tasks[0]}&#39; \/greater than less than\/LinearLayoutgreater than less than\/layoutgreater than \ud83c\udfaf MVVM\u3067\u610f\u8b58\u3059\u3079\u304d\u30dd\u30a4\u30f3\u30c8 ViewModel\u306bUI\u306e\u72b6\u614b\u3068\u30ed\u30b8\u30c3\u30af\u3092\u96c6\u7d04 Model\u306f\u5916\u90e8\u3068\u306e\u63a5\u70b9\uff08DB, API\uff09\u306b\u96c6\u4e2d View\u306f\u3067\u304d\u308b\u3060\u3051\u8868\u793a\u3060\u3051\u306b\u5fb9\u3059\u308b \ud83d\udcdd \u88dc\u8db3\uff1aJava\u3067MVVM\u3092\u66f8\u304f\u5834\u5408\u306e\u6ce8\u610f\u70b9 DataBinding\u306fKotlin\u3068\u6bd4\u3079\u308b\u3068Java\u3067\u306f\u3084\u3084\u5197\u9577\u306b\u306a\u308a\u304c\u3061\u3067\u3059\u304c\u3001\u5341\u5206\u5b9f\u7528\u7684\u3067\u3059\u3002 LiveData \u3092\u4f7f\u3048\u3070\u3001\u72b6\u614b\u306e\u76e3\u8996\u304c\u7c21\u5358\u306b\u306a\u308a\u307e\u3059\uff08\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u5730\u7344\u304b\u3089\u8131\u51fa\uff09\u3002 ViewModelProvider \u3067 ViewModel \u3092\u9069\u5207\u306b\u30b9\u30b3\u30fc\u30d7\u7ba1\u7406\u3057\u307e\u3057\u3087\u3046\u3002\", \"Japanese Female\");\n                }\n            };\n        <\/script>\n    <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd27 \u306a\u305cMVVM\u3092\u4f7f\u3046\u306e\u304b\uff1f<\/h2>\n\n\n\n<p>Android\u958b\u767a\u3067\u306f\u3001<strong>UI\u3068\u30ed\u30b8\u30c3\u30af\u304c\u5bc6\u7d50\u5408\u306b\u306a\u308a\u3084\u3059\u3044<\/strong>\u305f\u3081\u3001\u898f\u6a21\u304c\u5927\u304d\u304f\u306a\u308b\u3068\u4fdd\u5b88\u304c\u96e3\u3057\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>MVVM\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u60a9\u307f\u3092\u89e3\u6d88\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ul>\n<li>Activity\u3084Fragment\u304c\u80a5\u5927\u5316\u3059\u308b\uff08God Class\uff09<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u3057\u3065\u3089\u3044<\/li>\n\n\n\n<li>\u518d\u5229\u7528\u6027\u304c\u4f4e\u3044<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83e\uddf1 MVVM\u306e3\u3064\u306e\u8981\u7d20<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u8981\u7d20<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td><strong>Model<\/strong><\/td><td>\u30c7\u30fc\u30bf\u3084\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u3002\u305f\u3068\u3048\u3070\u3001DB\u30a2\u30af\u30bb\u30b9\u3084API\u901a\u4fe1\u306a\u3069\u3002<\/td><\/tr><tr><td><strong>View<\/strong><\/td><td>UI\uff08Activity\u3084Fragment\uff09\u3002\u57fa\u672c\u7684\u306b\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u8868\u793a\u3068\u64cd\u4f5c\u306e\u53d7\u3051\u4ed8\u3051\u3092\u62c5\u5f53\u3002<\/td><\/tr><tr><td><strong>ViewModel<\/strong><\/td><td>UI\u5411\u3051\u306e\u30c7\u30fc\u30bf\u4fdd\u6301\uff06\u5909\u63db\u3002Model\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3057\u3001View\u306b\u6e21\u3059\u4e2d\u9593\u5f79\u3002UI\u306e\u30ed\u30b8\u30c3\u30af\u3082\u3053\u3053\u306b\u96c6\u7d04\u3002<\/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\udce6 \u69cb\u6210\u306e\u30a4\u30e1\u30fc\u30b8\uff08\u56f3\uff09<\/h2>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-scss\" data-lang=\"SCSS\" data-show-lang=\"0\"><code>[ View (Activity \/ Fragment) ]\n         \u2191        \u2195\n    DataBinding   |\n         \u2193        |\n[ ViewModel (UI\u72b6\u614b\u30fb\u51e6\u7406) ]\n         \u2193\n[ Model (DB\/API\u306a\u3069) ]<\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\u2705 \u30b5\u30f3\u30d7\u30eb\uff1aTODO\u30ea\u30b9\u30c8\u98a8\u306e\u7c21\u6613\u69cb\u6210<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Model\u5c64\uff08\u30c7\u30fc\u30bf\u53d6\u5f97\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>public class TaskRepository {\n    public List&lt;String&gt; getTasks() {\n        return Arrays.asList(&quot;\u8cb7\u3044\u7269&quot;, &quot;\u5bbf\u984c&quot;, &quot;\u8aad\u66f8&quot;);\n    }\n}<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">ViewModel\u5c64<\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-csharp\" data-lang=\"C#\" data-show-lang=\"0\"><code>public class TaskViewModel extends ViewModel {\n    private final MutableLiveData&lt;List&lt;String&gt;&gt; tasks = new MutableLiveData&lt;&gt;();\n    private final TaskRepository repository = new TaskRepository();\n\n    public LiveData&lt;List&lt;String&gt;&gt; getTasks() {\n        return tasks;\n    }\n\n    public void loadTasks() {\n        tasks.setValue(repository.getTasks());\n    }\n}<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">View\u5c64\uff08Activity\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>public class MainActivity extends AppCompatActivity {\n    private TaskViewModel viewModel;\n\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);\n\n        viewModel = new ViewModelProvider(this).get(TaskViewModel.class);\n        binding.setViewModel(viewModel);\n        binding.setLifecycleOwner(this);\n\n        viewModel.loadTasks(); \/\/ \u30c7\u30fc\u30bf\u8aad\u307f\u8fbc\u307f\n    }\n}<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">XML\uff08<code>activity_main.xml<\/code>\uff09<\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-scss\" data-lang=\"SCSS\" data-show-lang=\"0\"><code>&lt;layout xmlns:android=&quot;http:\/\/schemas.android.com\/apk\/res\/android&quot;&gt;\n    &lt;data&gt;\n        &lt;variable name=&quot;viewModel&quot; type=&quot;com.example.TaskViewModel&quot;\/&gt;\n    &lt;\/data&gt;\n    &lt;LinearLayout\n        android:orientation=&quot;vertical&quot;\n        android:layout_width=&quot;match_parent&quot;\n        android:layout_height=&quot;match_parent&quot;&gt;\n        \n        &lt;TextView\n            android:layout_width=&quot;wrap_content&quot;\n            android:layout_height=&quot;wrap_content&quot;\n            android:text=&#39;@{viewModel.tasks[0]}&#39; \/&gt;\n    &lt;\/LinearLayout&gt;\n&lt;\/layout&gt;<\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83c\udfaf MVVM\u3067\u610f\u8b58\u3059\u3079\u304d\u30dd\u30a4\u30f3\u30c8<\/h2>\n\n\n\n<ul>\n<li><strong>ViewModel\u306bUI\u306e\u72b6\u614b\u3068\u30ed\u30b8\u30c3\u30af\u3092\u96c6\u7d04<\/strong><\/li>\n\n\n\n<li><strong>Model\u306f\u5916\u90e8\u3068\u306e\u63a5\u70b9\uff08DB, API\uff09\u306b\u96c6\u4e2d<\/strong><\/li>\n\n\n\n<li><strong>View\u306f\u3067\u304d\u308b\u3060\u3051\u8868\u793a\u3060\u3051\u306b\u5fb9\u3059\u308b<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udcdd \u88dc\u8db3\uff1aJava\u3067MVVM\u3092\u66f8\u304f\u5834\u5408\u306e\u6ce8\u610f\u70b9<\/h2>\n\n\n\n<ul>\n<li>DataBinding\u306fKotlin\u3068\u6bd4\u3079\u308b\u3068Java\u3067\u306f\u3084\u3084\u5197\u9577\u306b\u306a\u308a\u304c\u3061\u3067\u3059\u304c\u3001\u5341\u5206\u5b9f\u7528\u7684\u3067\u3059\u3002<\/li>\n\n\n\n<li><code>LiveData<\/code> \u3092\u4f7f\u3048\u3070\u3001\u72b6\u614b\u306e\u76e3\u8996\u304c\u7c21\u5358\u306b\u306a\u308a\u307e\u3059\uff08\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u5730\u7344\u304b\u3089\u8131\u51fa\uff09\u3002<\/li>\n\n\n\n<li><code>ViewModelProvider<\/code> \u3067 ViewModel \u3092\u9069\u5207\u306b\u30b9\u30b3\u30fc\u30d7\u7ba1\u7406\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/ul>\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\/1309"}],"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=1309"}],"version-history":[{"count":2,"href":"https:\/\/itstudy365.com\/blog\/wp-json\/wp\/v2\/posts\/1309\/revisions"}],"predecessor-version":[{"id":1408,"href":"https:\/\/itstudy365.com\/blog\/wp-json\/wp\/v2\/posts\/1309\/revisions\/1408"}],"wp:attachment":[{"href":"https:\/\/itstudy365.com\/blog\/wp-json\/wp\/v2\/media?parent=1309"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itstudy365.com\/blog\/wp-json\/wp\/v2\/categories?post=1309"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itstudy365.com\/blog\/wp-json\/wp\/v2\/tags?post=1309"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}