{"id":724,"date":"2023-12-07T14:23:55","date_gmt":"2022-08-02T19:07:08","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/%e3%82%a2%e3%83%b3%e3%83%89%e3%83%ad%e3%82%a4%e3%83%89%e3%81%aemvvm-livedata%e3%83%87%e3%83%bc%e3%82%bf%e3%83%90%e3%82%a4%e3%83%b3%e3%83%87%e3%82%a3%e3%83%b3%e3%82%b0\/"},"modified":"2025-08-01T01:57:57","modified_gmt":"2025-07-31T16:57:57","slug":"%e3%82%a2%e3%83%b3%e3%83%89%e3%83%ad%e3%82%a4%e3%83%89%e3%81%aemvvm-livedata%e3%83%87%e3%83%bc%e3%82%bf%e3%83%90%e3%82%a4%e3%83%b3%e3%83%87%e3%82%a3%e3%83%b3%e3%82%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e3%82%a2%e3%83%b3%e3%83%89%e3%83%ad%e3%82%a4%e3%83%89%e3%81%aemvvm-livedata%e3%83%87%e3%83%bc%e3%82%bf%e3%83%90%e3%82%a4%e3%83%b3%e3%83%87%e3%82%a3%e3%83%b3%e3%82%b0\/","title":{"rendered":"\u30a2\u30f3\u30c9\u30ed\u30a4\u30c9\u306eMVVM LiveData\u30c7\u30fc\u30bf\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0"},"content":{"rendered":"<p>MVVM\u3092\u4f7f\u7528\u3057\u305f\u30c7\u30fc\u30bf\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u306e\u5b9f\u88c5\u3068\u5225\u3005\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067LiveData\u3068Data Binding\u3092\u30ab\u30d0\u30fc\u3057\u307e\u3057\u305f\u3002\u4eca\u65e5\u306f\u3001MVVM\u3092\u4f7f\u7528\u3057\u305fAndroid\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u304a\u3044\u3066LiveData\u3068Data Binding\u3092\u7d44\u307f\u5408\u308f\u305b\u307e\u3059\u3002LiveData\u304cViewModel\u304b\u3089UI\u306e\u66f4\u65b0\u3092\u7c21\u5358\u306b\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>MVVM\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u3001LiveData\u3001Data Binding<\/h2>\n<p>\u3053\u308c\u307e\u3067\u3001\u79c1\u305f\u3061\u306fViewModel\u304b\u3089View\u3092\u66f4\u65b0\u3059\u308b\u305f\u3081\u306bData Binding\u3092\u4f7f\u7528\u3057\u3066\u304d\u307e\u3057\u305f\u3002LiveData\u306f\u3001\u6e21\u3055\u308c\u308b\u30c7\u30fc\u30bf\u306e\u30b3\u30f3\u30c6\u30ca\u3068\u3057\u3066\u6a5f\u80fd\u3059\u308b\u4fbf\u5229\u306a\u30c7\u30fc\u30bf\u30db\u30eb\u30c0\u30fc\u3067\u3059\u3002LiveData\u306e\u6700\u5927\u306e\u5229\u70b9\u306f\u3001\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u3092\u8a8d\u8b58\u3057\u3066\u3044\u308b\u3053\u3068\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u3044\u308b\u5834\u5408\u3001UI\u306f\u66f4\u65b0\u3057\u3088\u3046\u3068\u3057\u307e\u305b\u3093\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30e9\u30f3\u30bf\u30a4\u30e0\u3067\u306e\u30af\u30e9\u30c3\u30b7\u30e5\u304c\u5927\u5e45\u306b\u6e1b\u308a\u307e\u3059\u3002public methods setValue()\u3068getValue()\u3092\u63d0\u4f9b\u3059\u308b\u305f\u3081\u3001MutableLiveData\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u4e0a\u8a18\u306e\u6982\u5ff5\u3092\u4f7f\u7528\u3057\u3066\u3001\u30b7\u30f3\u30d7\u30eb\u306a\u30ed\u30b0\u30a4\u30f3\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u4f5c\u6210\u3057\u307e\u3057\u3087\u3046\u3002\u6700\u521d\u306fLiveData\u3068Two-way Data Binding\u3092\u4f7f\u7528\u3057\u3001\u305d\u306e\u5f8c\u3001Data Binding Observables\u3092\u5b8c\u5168\u306bLiveData\u306b\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u3057\u307e\u3059\u3002<\/p>\n<h3>\u59cb\u3081\u308b<\/h3>\n<p>\u30a2\u30d7\u30ea\u306ebuild.gradle\u306b\u6b21\u306e\u4f9d\u5b58\u95a2\u4fc2\u3092\u8ffd\u52a0\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"post-pre\"><code>\r\nandroid {\r\n    ...\r\n\r\n    dataBinding {\r\n        enabled = true\r\n    }\r\n    ...\r\n}\r\n\r\ndependencies {\r\n    ...\r\n    implementation 'android.arch.lifecycle:extensions:1.1.1'\r\n    implementation 'com.android.support:design:28.0.0-beta01'\r\n    ...\r\n}\r\n\r\n<\/code><\/pre>\n<h3>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u69cb\u9020<\/h3>\n<p>LoginViewModelOld\u30d5\u30a1\u30a4\u30eb\u306f\u53e4\u3044\u30b3\u30fc\u30c9\u3092\u542b\u307f\u3001LoginViewModel\u30d5\u30a1\u30a4\u30eb\u306b\u306f\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u3055\u308c\u305f\u30b3\u30fc\u30c9\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\u30e2\u30c7\u30eb<\/h3>\n<p>\u79c1\u305f\u3061\u306f\u3001User.java\u30af\u30e9\u30b9\u3067\u30e2\u30c7\u30eb\u3092\u5b9a\u7fa9\u3057\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.androidmvvmdatabindinglivedata;\r\n\r\n\r\nimport android.util.Patterns;\r\n\r\npublic class User {\r\n\r\n    private String mEmail;\r\n    private String mPassword;\r\n\r\n\r\n    public User(String email, String password) {\r\n        mEmail = email;\r\n        mPassword = password;\r\n    }\r\n\r\n    public String getEmail() {\r\n        if (mEmail == null) {\r\n            return \"\";\r\n        }\r\n        return mEmail;\r\n    }\r\n\r\n\r\n    public String getPassword() {\r\n\r\n        if (mPassword == null) {\r\n            return \"\";\r\n        }\r\n        return mPassword;\r\n    }\r\n\r\n    public boolean isEmailValid() {\r\n        return Patterns.EMAIL_ADDRESS.matcher(getEmail()).matches();\r\n    }\r\n\r\n\r\n    public boolean isPasswordLengthGreaterThan5() {\r\n        return getPassword().length() &gt; 5;\r\n    }\r\n\r\n}\r\n\r\n\r\n<\/code><\/pre>\n<h3>\u30ec\u30a4\u30a2\u30a6\u30c8<\/h3>\n<p>\u4ee5\u4e0b\u306bactivity_main.xml\u306e\u30b3\u30fc\u30c9\u304c\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>&lt;?xml version=\"1.0\" encoding=\"utf-8\"?&gt;\r\n&lt;layout xmlns:android=\"https:\/\/schemas.android.com\/apk\/res\/android\"\r\n    xmlns:app=\"https:\/\/schemas.android.com\/apk\/res-auto\"&gt;\r\n\r\n    &lt;data&gt;\r\n\r\n        &lt;variable\r\n            name=\"loginViewModel\"\r\n            type=\"com.scdev.androidmvvmdatabindinglivedata.LoginViewModel\" \/&gt;\r\n    &lt;\/data&gt;\r\n\r\n\r\n    &lt;ScrollView\r\n        android:layout_width=\"match_parent\"\r\n        android:layout_height=\"match_parent\"&gt;\r\n\r\n        &lt;LinearLayout\r\n            android:layout_width=\"match_parent\"\r\n            android:layout_height=\"wrap_content\"\r\n            android:layout_gravity=\"center\"\r\n            android:layout_margin=\"8dp\"\r\n            android:orientation=\"vertical\"&gt;\r\n\r\n            &lt;android.support.design.widget.TextInputLayout\r\n                android:layout_width=\"match_parent\"\r\n                android:layout_height=\"wrap_content\"\r\n                app:error=\"@{loginViewModel.errorEmail}\"\r\n                app:errorEnabled=\"true\"&gt;\r\n\r\n                &lt;EditText\r\n                    android:id=\"@+id\/inEmail\"\r\n                    android:layout_width=\"match_parent\"\r\n                    android:layout_height=\"wrap_content\"\r\n                    android:hint=\"Email\"\r\n                    android:inputType=\"textEmailAddress\"\r\n                    android:padding=\"8dp\"\r\n                    android:text=\"@={loginViewModel.email}\" \/&gt;\r\n\r\n            &lt;\/android.support.design.widget.TextInputLayout&gt;\r\n\r\n            &lt;android.support.design.widget.TextInputLayout\r\n                android:layout_width=\"match_parent\"\r\n                android:layout_height=\"wrap_content\"\r\n                app:error=\"@{loginViewModel.errorPassword}\"\r\n                app:errorEnabled=\"true\"&gt;\r\n\r\n                &lt;EditText\r\n                    android:id=\"@+id\/inPassword\"\r\n                    android:layout_width=\"match_parent\"\r\n                    android:layout_height=\"wrap_content\"\r\n                    android:hint=\"Password\"\r\n                    android:inputType=\"textPassword\"\r\n                    android:padding=\"8dp\"\r\n                    android:text=\"@={loginViewModel.password}\" \/&gt;\r\n\r\n            &lt;\/android.support.design.widget.TextInputLayout&gt;\r\n\r\n\r\n            &lt;Button\r\n                android:id=\"@+id\/button\"\r\n                android:layout_width=\"match_parent\"\r\n                android:layout_height=\"wrap_content\"\r\n                android:layout_marginTop=\"8dp\"\r\n                android:onClick=\"@{()-&gt; loginViewModel.onLoginClicked()}\"\r\n                android:text=\"LOGIN\" \/&gt;\r\n\r\n\r\n            &lt;ProgressBar\r\n                android:id=\"@+id\/progressBar\"\r\n                style=\"?android:attr\/progressBarStyleLarge\"\r\n                android:layout_width=\"wrap_content\"\r\n                android:layout_height=\"wrap_content\"\r\n                android:layout_gravity=\"center_horizontal\"\r\n                android:layout_marginTop=\"8dp\"\r\n                android:visibility=\"@{loginViewModel.busy}\" \/&gt;\r\n\r\n\r\n        &lt;\/LinearLayout&gt;\r\n\r\n    &lt;\/ScrollView&gt;\r\n\r\n&lt;\/layout&gt;\r\n\r\n<\/code><\/pre>\n<p>\u30ed\u30b0\u30a4\u30f3\u6a5f\u80fd\u3092\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3059\u308b\u305f\u3081\u306b\u3001\u30d7\u30ed\u30b0\u30ec\u30b9\u30d0\u30fc\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>\u30d3\u30e5\u30fc\u30e2\u30c7\u30eb<\/h3>\n<p>\u4ee5\u4e0b\u306bLoginViewModel.java\u306e\u30b3\u30fc\u30c9\u304c\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.androidmvvmdatabindinglivedata;\r\n\r\nimport android.arch.lifecycle.LiveData;\r\nimport android.arch.lifecycle.MutableLiveData;\r\nimport android.databinding.BaseObservable;\r\nimport android.databinding.Bindable;\r\nimport android.databinding.ObservableField;\r\nimport android.os.Handler;\r\nimport android.support.annotation.NonNull;\r\n\r\n\r\npublic class LoginViewModel extends BaseObservable {\r\n    private String email;\r\n    private String password;\r\n    private int busy = 8;\r\n    public final ObservableField&lt;String&gt; errorPassword = new ObservableField&lt;&gt;();\r\n    public final ObservableField&lt;String&gt; errorEmail = new ObservableField&lt;&gt;();\r\n\r\n    public LoginViewModel() {\r\n    }\r\n\r\n    private MutableLiveData&lt;User&gt; userMutableLiveData;\r\n\r\n    LiveData&lt;User&gt; getUser() {\r\n        if (userMutableLiveData == null) {\r\n            userMutableLiveData = new MutableLiveData&lt;&gt;();\r\n        }\r\n\r\n        return userMutableLiveData;\r\n    }\r\n\r\n    @Bindable\r\n    @NonNull\r\n    public String getEmail() {\r\n        return this.email;\r\n    }\r\n\r\n    public void setEmail(@NonNull String email) {\r\n        this.email = email;\r\n        notifyPropertyChanged(BR.email);\r\n    }\r\n\r\n    @Bindable\r\n    @NonNull\r\n    public String getPassword() {\r\n        return this.password;\r\n    }\r\n\r\n    public void setPassword(@NonNull String password) {\r\n        this.password = password;\r\n        notifyPropertyChanged(BR.password);\r\n    }\r\n\r\n    @Bindable\r\n    public int getBusy() {\r\n        return this.busy;\r\n    }\r\n\r\n    public void setBusy(int busy) {\r\n        this.busy = busy;\r\n        notifyPropertyChanged(BR.busy);\r\n    }\r\n\r\n\r\n    public void onLoginClicked() {\r\n\r\n        setBusy(0); \/\/View.VISIBLE\r\n        new Handler().postDelayed(new Runnable() {\r\n            @Override\r\n            public void run() {\r\n\r\n\r\n                User user = new User(getEmail(), getPassword());\r\n\r\n                if (!user.isEmailValid()) {\r\n                    errorEmail.set(\"Enter a valid email address\");\r\n                } else {\r\n                    errorEmail.set(null);\r\n                }\r\n\r\n                if (!user.isPasswordLengthGreaterThan5())\r\n                    errorPassword.set(\"Password Length should be greater than 5\");\r\n                else {\r\n                    errorPassword.set(null);\r\n                }\r\n\r\n                userMutableLiveData.setValue(user);\r\n                setBusy(8); \/\/8 == View.GONE\r\n\r\n            }\r\n        }, 5000);\r\n    }\r\n}\r\n\r\n\r\n\r\n<\/code><\/pre>\n<p>ObservableField\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30e9\u30c3\u30d1\u30fc\u3067\u3001\u89b3\u6e2c\u53ef\u80fd\u306b\u3057\u307e\u3059\u3002\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001User\u3092LiveData\u3067\u30ab\u30d7\u30bb\u30eb\u5316\u3057\u307e\u3057\u305f\u3002\u30e6\u30fc\u30b6\u30fc\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5909\u66f4\u3055\u308c\u308b\u305f\u3073\u306b\u3001MainActivity\u3067\u89b3\u6e2c\u3055\u308c\u3001\u9069\u5207\u306a\u30a2\u30af\u30b7\u30e7\u30f3\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u308b\u3068\u3001ProgressBar\u3092Visible\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002View.VISIBLE = 0\u3001View.GONE == 8 5\u79d2\u306e\u9045\u5ef6\u5f8c\u306b\u3001\u30e1\u30fc\u30eb\u3068\u30d1\u30b9\u30ef\u30fc\u30c9\u304c\u691c\u8a3c\u3055\u308c\u3001TextInputLayout\u306e\u30d0\u30a4\u30f3\u30c9\u53ef\u80fd\u306a\u5024\u304c\u66f4\u65b0\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>ObservableField\u306f\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u306b\u6ce8\u610f\u3092\u6255\u3063\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n<p>\u4ee5\u4e0b\u306bMainActivity.java\u30af\u30e9\u30b9\u304c\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.androidmvvmdatabindinglivedata;\r\n\r\nimport android.arch.lifecycle.Observer;\r\nimport android.databinding.DataBindingUtil;\r\nimport android.support.annotation.Nullable;\r\nimport android.support.v7.app.AppCompatActivity;\r\nimport android.os.Bundle;\r\nimport android.widget.Toast;\r\n\r\nimport com.scdev.androidmvvmdatabindinglivedata.databinding.ActivityMainBinding;\r\n\r\npublic class MainActivity extends AppCompatActivity {\r\n\r\n    @Override\r\n    protected void onCreate(Bundle savedInstanceState) {\r\n        super.onCreate(savedInstanceState);\r\n\r\n\r\n        ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);\r\n        LoginViewModel loginViewModel = new LoginViewModel();\r\n        binding.setLoginViewModel(loginViewModel);\r\n\r\n        loginViewModel.getUser().observe(this, new Observer() {\r\n            @Override\r\n            public void onChanged(@Nullable User user) {\r\n                if (user.getEmail().length() &gt; 0 || user.getPassword().length() &gt; 0)\r\n                    Toast.makeText(getApplicationContext(), \"email : \" + user.getEmail() + \" password \" + user.getPassword(), Toast.LENGTH_SHORT).show();\r\n            }\r\n        });\r\n\r\n    }\r\n}\r\n\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001observe\u30e1\u30bd\u30c3\u30c9\u306fMutableLiveData\u306b\u542b\u307e\u308c\u3066\u3044\u305fUser\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5909\u66f4\u3092\u76e3\u8996\u3057\u307e\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u540d\u3068\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u542b\u3080\u30c8\u30fc\u30b9\u30c8\u3092\u8868\u793a\u3057\u307e\u3059\u3002\u305d\u308c\u3067\u306f\u3001ObservableField\u3092\u5b8c\u5168\u306bLiveData\u3067\u7f6e\u304d\u63db\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>ObservableField\u3092LiveData\u306b\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u3059\u308b\u3002<\/h3>\n<p>\u65b0\u3057\u3044LoginViewModel.java\u30af\u30e9\u30b9\u306e\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.androidmvvmdatabindinglivedata;\r\n\r\nimport android.arch.lifecycle.LiveData;\r\nimport android.arch.lifecycle.MutableLiveData;\r\nimport android.arch.lifecycle.ViewModel;\r\nimport android.os.Handler;\r\n\r\n\r\npublic class LoginViewModel extends ViewModel {\r\n\r\n\r\n    public MutableLiveData&lt;String&gt; errorPassword = new MutableLiveData&lt;&gt;();\r\n    public MutableLiveData&lt;String&gt; errorEmail = new MutableLiveData&lt;&gt;();\r\n\r\n    public MutableLiveData&lt;String&gt; email = new MutableLiveData&lt;&gt;();\r\n    public MutableLiveData&lt;String&gt; password = new MutableLiveData&lt;&gt;();\r\n    public MutableLiveData&lt;Integer&gt; busy;\r\n\r\n    public MutableLiveData&lt;Integer&gt; getBusy() {\r\n\r\n        if (busy == null) {\r\n            busy = new MutableLiveData&lt;&gt;();\r\n            busy.setValue(8);\r\n        }\r\n\r\n        return busy;\r\n    }\r\n\r\n\r\n    public LoginViewModel() {\r\n\r\n    }\r\n\r\n    private MutableLiveData&lt;User&gt; userMutableLiveData;\r\n\r\n    LiveData&lt;User&gt; getUser() {\r\n        if (userMutableLiveData == null) {\r\n            userMutableLiveData = new MutableLiveData&lt;&gt;();\r\n        }\r\n\r\n        return userMutableLiveData;\r\n    }\r\n\r\n\r\n    public void onLoginClicked() {\r\n\r\n        getBusy().setValue(0); \/\/View.VISIBLE\r\n        new Handler().postDelayed(new Runnable() {\r\n            @Override\r\n            public void run() {\r\n\r\n\r\n                User user = new User(email.getValue(), password.getValue());\r\n\r\n                if (!user.isEmailValid()) {\r\n                    errorEmail.setValue(\"Enter a valid email address\");\r\n                } else {\r\n                    errorEmail.setValue(null);\r\n                }\r\n\r\n                if (!user.isPasswordLengthGreaterThan5())\r\n                    errorPassword.setValue(\"Password Length should be greater than 5\");\r\n                else {\r\n                    errorPassword.setValue(null);\r\n                }\r\n\r\n                userMutableLiveData.setValue(user);\r\n                busy.setValue(8); \/\/8 == View.GONE\r\n\r\n            }\r\n        }, 3000);\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30af\u30e9\u30b9\u306f\u3001BaseObservable\u306f\u3082\u306f\u3084\u5fc5\u8981\u306a\u3044\u305f\u3081\u3001\u73fe\u5728ViewModel\u3092\u7d99\u627f\u3057\u3066\u3044\u307e\u3059\u3002ObservableFields\u306fMutableLiveData\u306b\u5909\u66f4\u3055\u308c\u307e\u3057\u305f\u3002MutableLiveData\u306e\u5909\u66f4\u306f\u3001Data Binding\u306e\u304a\u304b\u3052\u3067\u81ea\u52d5\u7684\u306b\u30ec\u30a4\u30a2\u30a6\u30c8\u306b\u53cd\u6620\u3055\u308c\u307e\u3059\u3002MainActivity.java\u30af\u30e9\u30b9\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u66f4\u65b0\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.androidmvvmdatabindinglivedata;\r\n\r\nimport android.arch.lifecycle.Observer;\r\nimport android.arch.lifecycle.ViewModelProviders;\r\nimport android.databinding.DataBindingUtil;\r\nimport android.support.annotation.Nullable;\r\nimport android.support.v7.app.AppCompatActivity;\r\nimport android.os.Bundle;\r\nimport android.widget.Toast;\r\n\r\nimport com.scdev.androidmvvmdatabindinglivedata.databinding.ActivityMainBinding;\r\n\r\npublic class MainActivity extends AppCompatActivity {\r\n\r\n    @Override\r\n    protected void onCreate(Bundle savedInstanceState) {\r\n        super.onCreate(savedInstanceState);\r\n\r\n\r\n        ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);\r\n        LoginViewModel loginViewModel = ViewModelProviders.of(this).get(LoginViewModel.class);\r\n        binding.setLoginViewModel(loginViewModel);\r\n        binding.setLifecycleOwner(this);\r\n        \r\n\r\n        loginViewModel.getUser().observe(this, new Observer() {\r\n            @Override\r\n            public void onChanged(@Nullable User user) {\r\n                if (user.getEmail().length() &gt; 0 || user.getPassword().length() &gt; 0)\r\n                    Toast.makeText(getApplicationContext(), \"email : \" + user.getEmail() + \" password \" + user.getPassword(), Toast.LENGTH_SHORT).show();\r\n            }\r\n        });\r\n\r\n    }\r\n}\r\n\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u4f8b\u306e\u3088\u3046\u306b\u3001ViewModelProviders.of\u3092\u4f7f\u7528\u3057\u3066ViewModel\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306fViewModel\u3092\u4e00\u5ea6\u3060\u3051\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3057\u307e\u3059\u3002\u4ee5\u964d\u306e\u3059\u3079\u3066\u306e\u547c\u3073\u51fa\u3057\u3067\u306f\u3001\u540c\u3058\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u518d\u5229\u7528\u3055\u308c\u307e\u3059\u3002LifecycleOwner\u306f\u3001\u79c1\u305f\u3061\u306eActivity\u304c\u30d0\u30a4\u30f3\u30c9\u3067\u304d\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u3059\u3002\u4e0a\u8a18\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u51fa\u529b\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a\u8868\u793a\u3055\u308c\u308b\u3088\u3046\u306b\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u96e2\u308c\u308b\u3068\u3001Toast\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u8868\u793a\u3055\u308c\u307e\u305b\u3093\u3002LiveData\u306f\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u518d\u5ea6\u958b\u304f\u3068\u3001\u30c8\u30fc\u30b9\u30c8\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u3067\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306f\u7d42\u4e86\u3067\u3059\u3002\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306f\u4ee5\u4e0b\u306e\u30ea\u30f3\u30af\u304b\u3089\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>AndroidMVVMDataBindingLiveData\u3092\u65e5\u672c\u8a9e\u3067\u8868\u73fe\u3059\u308b\u3068\u3001\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059:<\/p>\n<p>\u30a2\u30f3\u30c9\u30ed\u30a4\u30c9\u306eMVVM\u30c7\u30fc\u30bf\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u30e9\u30a4\u30d6\u30c7\u30fc\u30bf<\/p>\n<p>GitHub\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u30ea\u30f3\u30af<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MVVM\u3092\u4f7f\u7528\u3057\u305f\u30c7\u30fc\u30bf\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u306e\u5b9f\u88c5\u3068\u5225\u3005\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067LiveData\u3068Data Binding\u3092\u30ab\u30d0\u30fc\u3057\u307e\u3057\u305f\u3002\u4eca\u65e5\u306f\u3001MVVM\u3092\u4f7f\u7528\u3057\u305fAndroid\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u304a\u3044\u3066LiveData\u3068Data  [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-724","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u30a2\u30f3\u30c9\u30ed\u30a4\u30c9\u306eMVVM LiveData\u30c7\u30fc\u30bf\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u30a2\u30f3\u30c9\u30ed\u30a4\u30c9\u306eMVVM 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