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Adds ViewModel Example
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‎com.vogella.android.viewmodel/app/build.gradle

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apply plugin: 'com.android.application'
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android {
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compileSdkVersion 26
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buildToolsVersion "26.0.0"
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defaultConfig {
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applicationId "com.vogella.android.viewmodel"
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minSdkVersion 25
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targetSdkVersion 26
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versionCode 1
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versionName "1.0"
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testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
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}
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buildTypes {
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release {
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minifyEnabled false
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proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
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}
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}
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}
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dependencies {
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compile fileTree(dir: 'libs', include: ['*.jar'])
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androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
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exclude group: 'com.android.support', module: 'support-annotations'
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})
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compile 'com.android.support.constraint:constraint-layout:1.0.2'
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testCompile 'junit:junit:4.12'
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compile "android.arch.lifecycle:runtime:1.0.0-alpha3"
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compile "android.arch.lifecycle:extensions:1.0.0-alpha3"
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annotationProcessor "android.arch.lifecycle:compiler:1.0.0-alpha3"
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compile 'com.android.support:appcompat-v7:25.3.1'
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}

‎com.vogella.android.viewmodel/app/proguard-rules.pro

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# Add project specific ProGuard rules here.
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# By default, the flags in this file are appended to flags specified
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# in /home/vogella/Android/Sdk/tools/proguard/proguard-android.txt
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# You can edit the include path and order by changing the proguardFiles
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# directive in build.gradle.
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#
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# For more details, see
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# http://developer.android.com/guide/developing/tools/proguard.html
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# Add any project specific keep options here:
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# If your project uses WebView with JS, uncomment the following
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# and specify the fully qualified class name to the JavaScript interface
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# class:
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#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
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# public *;
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#}
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# Uncomment this to preserve the line number information for
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# debugging stack traces.
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#-keepattributes SourceFile,LineNumberTable
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# If you keep the line number information, uncomment this to
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# hide the original source file name.
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#-renamesourcefileattribute SourceFile

‎com.vogella.android.viewmodel/app/src/androidTest/java/com/vogella/android/viewmodel/ExampleInstrumentedTest.java

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package com.vogella.android.viewmodel;
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import android.content.Context;
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import android.support.test.InstrumentationRegistry;
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import android.support.test.runner.AndroidJUnit4;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import static org.junit.Assert.*;
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/**
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* Instrumentation test, which will execute on an Android device.
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*
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* @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
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*/
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@RunWith(AndroidJUnit4.class)
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public class ExampleInstrumentedTest {
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@Test
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public void useAppContext() throws Exception {
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// Context of the app under test.
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Context appContext = InstrumentationRegistry.getTargetContext();
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assertEquals("com.vogella.android.viewmodel", appContext.getPackageName());
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}
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}

‎com.vogella.android.viewmodel/app/src/main/AndroidManifest.xml

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.vogella.android.viewmodel">
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<application
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android:allowBackup="true"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:roundIcon="@mipmap/ic_launcher_round"
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android:supportsRtl="true"
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android:theme="@style/AppTheme">
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<activity android:name=".MainActivity">
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<intent-filter>
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<action android:name="android.intent.action.MAIN"/>
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<category android:name="android.intent.category.LAUNCHER"/>
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎com.vogella.android.viewmodel/app/src/main/java/com/vogella/android/viewmodel/MainActivity.java

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package com.vogella.android.viewmodel;
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import android.arch.lifecycle.LifecycleActivity;
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import android.arch.lifecycle.Observer;
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import android.arch.lifecycle.ViewModelProviders;
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import android.os.Bundle;
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import android.support.annotation.Nullable;
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import android.widget.TextView;
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import java.util.List;
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public class MainActivity extends LifecycleActivity {
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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final MyViewModel model = ViewModelProviders.of(this).get(MyViewModel.class);
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model.getUsers().observe(MainActivity.this, new Observer<List<User>>() {
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@Override
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public void onChanged(@Nullable List<User> users) {
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// update UI
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TextView textView = findViewById(R.id.result);
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textView.setText(model.getUsers().getValue().get(0).toString());
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}
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});
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}
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}

‎com.vogella.android.viewmodel/app/src/main/java/com/vogella/android/viewmodel/MyViewModel.java

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package com.vogella.android.viewmodel;
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import android.arch.lifecycle.LiveData;
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import android.arch.lifecycle.MutableLiveData;
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import android.arch.lifecycle.ViewModel;
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import java.util.ArrayList;
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import java.util.List;
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public class MyViewModel extends ViewModel {
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private MutableLiveData<List<User>> users;
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public LiveData<List<User>> getUsers() {
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if (users == null) {
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users = new MutableLiveData<List<User>>();
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loadUsers();
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}
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return users;
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}
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private void loadUsers() {
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try {
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Thread.sleep(5000);
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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List<User> list = new ArrayList<>();
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User user = new User();
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user.name = "Testing";
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list.add(user);
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users.setValue(list);
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// do async operation to fetch users
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}
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}

‎com.vogella.android.viewmodel/app/src/main/java/com/vogella/android/viewmodel/User.java

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package com.vogella.android.viewmodel;
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/**
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* Created by vogella on 12.07.17.
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*/
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public class User {
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public String name;
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@Override
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public String toString() {
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return "User{" +
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"name='" + name + '\'' +
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'}';
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}
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}

‎com.vogella.android.viewmodel/app/src/main/res/layout/activity_main.xml

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<?xml version="1.0" encoding="utf-8"?>
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<android.support.constraint.ConstraintLayout
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xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:app="http://schemas.android.com/apk/res-auto"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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tools:context="com.vogella.android.viewmodel.MainActivity"
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>
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<TextView
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android:id="@+id/result"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="Hello World!"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintLeft_toLeftOf="parent"
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app:layout_constraintRight_toRightOf="parent"
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app:layout_constraintTop_toTopOf="parent"
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/>
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</android.support.constraint.ConstraintLayout>

‎com.vogella.android.viewmodel/app/src/main/res/mipmap-hdpi/ic_launcher.png

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‎com.vogella.android.viewmodel/app/src/main/res/mipmap-hdpi/ic_launcher_round.png

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‎com.vogella.android.viewmodel/app/src/main/res/mipmap-mdpi/ic_launcher.png

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‎com.vogella.android.viewmodel/app/src/main/res/mipmap-mdpi/ic_launcher_round.png

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‎com.vogella.android.viewmodel/app/src/main/res/mipmap-xhdpi/ic_launcher.png

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‎com.vogella.android.viewmodel/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png

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‎com.vogella.android.viewmodel/app/src/main/res/mipmap-xxhdpi/ic_launcher.png

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‎com.vogella.android.viewmodel/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png

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‎com.vogella.android.viewmodel/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png

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‎com.vogella.android.viewmodel/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png

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‎com.vogella.android.viewmodel/app/src/main/res/values/colors.xml

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<?xml version="1.0" encoding="utf-8"?>
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<resources>
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<color name="colorPrimary">#3F51B5</color>
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<color name="colorPrimaryDark">#303F9F</color>
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<color name="colorAccent">#FF4081</color>
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</resources>

‎com.vogella.android.viewmodel/app/src/main/res/values/strings.xml

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<resources>
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<string name="app_name">ViewModel</string>
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</resources>

‎com.vogella.android.viewmodel/app/src/main/res/values/styles.xml

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<resources>
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<!-- Base application theme. -->
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<style name="AppTheme" parent="android:Theme.Material.Light.DarkActionBar">
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<!-- Customize your theme here. -->
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</style>
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</resources>

‎com.vogella.android.viewmodel/app/src/test/java/com/vogella/android/viewmodel/ExampleUnitTest.java

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package com.vogella.android.viewmodel;
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import org.junit.Test;
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import static org.junit.Assert.*;
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/**
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* Example local unit test, which will execute on the development machine (host).
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*
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* @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
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*/
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public class ExampleUnitTest {
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@Test
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public void addition_isCorrect() throws Exception {
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assertEquals(4, 2 + 2);
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}
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}

‎com.vogella.android.viewmodel/build.gradle

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// Top-level build file where you can add configuration options common to all sub-projects/modules.
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buildscript {
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repositories {
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jcenter()
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}
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dependencies {
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classpath 'com.android.tools.build:gradle:2.3.3'
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// NOTE: Do not place your application dependencies here; they belong
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// in the individual module build.gradle files
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}
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}
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allprojects {
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repositories {
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jcenter()
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maven { url 'https://maven.google.com' }
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}
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}
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task clean(type: Delete) {
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delete rootProject.buildDir
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}

‎com.vogella.android.viewmodel/gradle.properties

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# Project-wide Gradle settings.
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# IDE (e.g. Android Studio) users:
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# Gradle settings configured through the IDE *will override*
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# any settings specified in this file.
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# For more details on how to configure your build environment visit
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# http://www.gradle.org/docs/current/userguide/build_environment.html
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# Specifies the JVM arguments used for the daemon process.
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# The setting is particularly useful for tweaking memory settings.
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org.gradle.jvmargs=-Xmx1536m
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# When configured, Gradle will run in incubating parallel mode.
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# This option should only be used with decoupled projects. More details, visit
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# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
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# org.gradle.parallel=true

‎com.vogella.android.viewmodel/gradle/wrapper/gradle-wrapper.jar

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‎com.vogella.android.viewmodel/gradle/wrapper/gradle-wrapper.properties

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#Wed Jul 12 07:34:42 CEST 2017
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distributionBase=GRADLE_USER_HOME
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distributionPath=wrapper/dists
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zipStoreBase=GRADLE_USER_HOME
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zipStorePath=wrapper/dists
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distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip

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