├── .gitignore ├── .idea ├── .name ├── compiler.xml ├── copyright │ └── profiles_settings.xml ├── encodings.xml ├── gradle.xml ├── inspectionProfiles │ ├── Project_Default.xml │ └── profiles_settings.xml ├── misc.xml ├── modules.xml ├── runConfigurations.xml └── vcs.xml ├── README.md ├── app ├── .gitignore ├── build.gradle ├── proguard-rules.pro └── src │ ├── androidTest │ └── java │ │ └── com │ │ └── nilzor │ │ └── presenterexample │ │ └── ApplicationTest.java │ ├── main │ ├── AndroidManifest.xml │ ├── java │ │ └── com │ │ │ └── nilzor │ │ │ └── presenterexample │ │ │ ├── helpers │ │ │ ├── AppNavigator.java │ │ │ ├── EditTextHelper.java │ │ │ └── ToastPresenter.java │ │ │ ├── ui │ │ │ ├── LoginActivity.java │ │ │ ├── LoginFragment.java │ │ │ └── MainActivity.java │ │ │ └── viewmodels │ │ │ └── LoginFragmentViewModel.java │ └── res │ │ ├── layout │ │ ├── activity_login.xml │ │ ├── activity_main.xml │ │ └── fragment_login.xml │ │ ├── mipmap-hdpi │ │ └── ic_launcher.png │ │ ├── mipmap-mdpi │ │ └── ic_launcher.png │ │ ├── mipmap-xhdpi │ │ └── ic_launcher.png │ │ ├── mipmap-xxhdpi │ │ └── ic_launcher.png │ │ ├── values-v21 │ │ └── styles.xml │ │ ├── values-w820dp │ │ └── dimens.xml │ │ └── values │ │ ├── dimens.xml │ │ ├── strings.xml │ │ └── styles.xml │ └── test │ └── java │ └── com │ └── nilzor │ └── presenterexample │ └── viewmodels │ └── LoginFragmentViewModelTest.java ├── build.gradle ├── gradle.properties ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle /.gitignore: -------------------------------------------------------------------------------- 1 | .gradle 2 | /local.properties 3 | /.idea/workspace.xml 4 | /.idea/libraries 5 | .DS_Store 6 | /build 7 | *.iml 8 | *.keystore 9 | captures/ -------------------------------------------------------------------------------- /.idea/.name: -------------------------------------------------------------------------------- 1 | mvp-to-mvvm-transition -------------------------------------------------------------------------------- /.idea/compiler.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | -------------------------------------------------------------------------------- /.idea/copyright/profiles_settings.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | -------------------------------------------------------------------------------- /.idea/encodings.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /.idea/gradle.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 17 | 18 | -------------------------------------------------------------------------------- /.idea/inspectionProfiles/Project_Default.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 51 | -------------------------------------------------------------------------------- /.idea/inspectionProfiles/profiles_settings.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 7 | -------------------------------------------------------------------------------- /.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 19 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 46 | -------------------------------------------------------------------------------- /.idea/modules.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /.idea/runConfigurations.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 11 | 12 | -------------------------------------------------------------------------------- /.idea/vcs.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | This is an example app which use data binding to illustrate a dynamic and inter-dependent GUI. 2 | 3 | ![image](https://cloud.githubusercontent.com/assets/990654/26285791/cf202b3a-3e56-11e7-9f58-5f47db47af71.png) 4 | 5 | - UI elements are hidden/shown dependent on the radio button states 6 | - There is delayed loading of data ("# of logged in users") which illustrate network requests and async UI update 7 | 8 | Originally written as support code for the blog post named [Android Databinding: Goodbye Presenter, Hello Viewmodel!](http://tech.vg.no/2015/07/17/android-databinding-goodbye-presenter-hello-viewmodel/). 9 | See tags [mvp](https://github.com/Nilzor/mvp-to-mvvm-transition/tree/mvp) and [mvvm](https://github.com/Nilzor/mvp-to-mvvm-transition/tree/mvvm) referred to by that post. 10 | 11 | Later expanded upon to include a more complete Databinding example with full **two-way databinding** of EditText-fields at the 12 | [two-way-implicit](https://github.com/Nilzor/mvp-to-mvvm-transition/tree/two-way-implicit) tag, 13 | or manual read-back if you prefer that by the [two-way-explicit](https://github.com/Nilzor/mvp-to-mvvm-transition/tree/two-way-explicit) tag. 14 | 15 | The final addition is **viewmodel retention** upon device rotation in later commits of branch [two-way](https://github.com/Nilzor/mvp-to-mvvm-transition/tree/twoway), 16 | and also experimentation with using the `LiveData` and `ViewModelProviders` classes of the [Android Architecture Components](https://developer.android.com/topic/libraries/architecture/index.html) 17 | tool box in the branch [androidarch](https://github.com/Nilzor/mvp-to-mvvm-transition/tree/androidarch) 18 | 19 | 20 | -------------------------------------------------------------------------------- /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | apply plugin: 'me.tatarka.retrolambda' 3 | 4 | 5 | repositories { 6 | maven { 7 | url 'https://clojars.org/repo/' // For icepick 8 | } 9 | } 10 | 11 | android { 12 | compileSdkVersion 23 13 | buildToolsVersion "23.0.1" 14 | 15 | dataBinding { 16 | enabled true 17 | } 18 | 19 | defaultConfig { 20 | applicationId "com.nilzor.presenterexample" 21 | minSdkVersion 17 22 | targetSdkVersion 23 23 | versionCode 1 24 | versionName "1.0" 25 | } 26 | buildTypes { 27 | release { 28 | minifyEnabled false 29 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 30 | } 31 | } 32 | compileOptions { 33 | sourceCompatibility JavaVersion.VERSION_1_8 34 | targetCompatibility JavaVersion.VERSION_1_8 35 | } 36 | } 37 | 38 | dependencies { 39 | compile fileTree(dir: 'libs', include: ['*.jar']) 40 | compile 'com.android.support:appcompat-v7:23.1.0' 41 | compile 'com.squareup:otto:1.3.8' 42 | compile 'com.hannesdorfmann.mosby:core:+' 43 | compile 'com.hannesdorfmann.mosby:mvp:+' 44 | retrolambdaConfig 'net.orfjackal.retrolambda:retrolambda:2.0.4' 45 | testCompile 'junit:junit:4.12' 46 | testCompile 'org.mockito:mockito-core:1.+' 47 | } 48 | -------------------------------------------------------------------------------- /app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # By default, the flags in this file are appended to flags specified 3 | # in C:\coding\android-sdk/tools/proguard/proguard-android.txt 4 | # You can edit the include path and order by changing the proguardFiles 5 | # directive in build.gradle. 6 | # 7 | # For more details, see 8 | # http://developer.android.com/guide/developing/tools/proguard.html 9 | 10 | # Add any project specific keep options here: 11 | 12 | # If your project uses WebView with JS, uncomment the following 13 | # and specify the fully qualified class name to the JavaScript interface 14 | # class: 15 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 16 | # public *; 17 | #} 18 | -------------------------------------------------------------------------------- /app/src/androidTest/java/com/nilzor/presenterexample/ApplicationTest.java: -------------------------------------------------------------------------------- 1 | package com.nilzor.presenterexample; 2 | 3 | import android.app.Application; 4 | import android.test.ApplicationTestCase; 5 | 6 | /** 7 | * Testing Fundamentals 8 | */ 9 | public class ApplicationTest extends ApplicationTestCase { 10 | public ApplicationTest() { 11 | super(Application.class); 12 | } 13 | } -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 10 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 23 | 24 | 25 | 26 | 27 | -------------------------------------------------------------------------------- /app/src/main/java/com/nilzor/presenterexample/helpers/AppNavigator.java: -------------------------------------------------------------------------------- 1 | package com.nilzor.presenterexample.helpers; 2 | 3 | import android.content.Context; 4 | import android.content.Intent; 5 | 6 | import com.nilzor.presenterexample.ui.MainActivity; 7 | 8 | public class AppNavigator { 9 | private final Context mContext; 10 | 11 | public AppNavigator(Context context) { 12 | mContext = context; 13 | } 14 | 15 | public void gotoMainScreen() { 16 | mContext.startActivity(new Intent(mContext, MainActivity.class)); 17 | } 18 | } 19 | -------------------------------------------------------------------------------- /app/src/main/java/com/nilzor/presenterexample/helpers/EditTextHelper.java: -------------------------------------------------------------------------------- 1 | package com.nilzor.presenterexample.helpers; 2 | 3 | import android.text.Editable; 4 | import android.text.TextWatcher; 5 | import android.widget.EditText; 6 | 7 | public class EditTextHelper { 8 | public interface AfterTextChangedInterface { 9 | void afterTextChanged(); 10 | } 11 | 12 | public static void bindOnChangeListener(EditText editText, AfterTextChangedInterface afterTextChangedListener) { 13 | editText.addTextChangedListener(new TextWatcher() { 14 | @Override 15 | public void beforeTextChanged(CharSequence s, int start, int count, int after) { 16 | 17 | } 18 | 19 | @Override 20 | public void onTextChanged(CharSequence s, int start, int before, int count) { 21 | 22 | } 23 | 24 | @Override 25 | public void afterTextChanged(Editable s) { 26 | afterTextChangedListener.afterTextChanged(); 27 | } 28 | }); 29 | } 30 | } 31 | -------------------------------------------------------------------------------- /app/src/main/java/com/nilzor/presenterexample/helpers/ToastPresenter.java: -------------------------------------------------------------------------------- 1 | package com.nilzor.presenterexample.helpers; 2 | 3 | import android.content.Context; 4 | import android.widget.Toast; 5 | 6 | public class ToastPresenter { 7 | private final Context mContext; 8 | 9 | /** @param appContext ApplicationContext. Will not accept contet tied to activity or fragment in order to avoid memory leaks */ 10 | public ToastPresenter(Context appContext) { 11 | if (appContext != appContext.getApplicationContext()) throw new IllegalArgumentException("Context must be appContext"); 12 | mContext = appContext; 13 | } 14 | 15 | public void showShortToast(String text) { 16 | Toast.makeText(mContext, text, Toast.LENGTH_SHORT).show(); 17 | } 18 | 19 | public void showLongToast(String text) { 20 | Toast.makeText(mContext, text, Toast.LENGTH_LONG).show(); 21 | } 22 | } 23 | -------------------------------------------------------------------------------- /app/src/main/java/com/nilzor/presenterexample/ui/LoginActivity.java: -------------------------------------------------------------------------------- 1 | package com.nilzor.presenterexample.ui; 2 | 3 | import android.support.v7.app.AppCompatActivity; 4 | import android.os.Bundle; 5 | import android.view.Menu; 6 | import android.view.MenuItem; 7 | import android.view.View; 8 | 9 | import com.nilzor.presenterexample.R; 10 | 11 | public class LoginActivity extends AppCompatActivity { 12 | 13 | @Override 14 | protected void onCreate(Bundle savedInstanceState) { 15 | super.onCreate(savedInstanceState); 16 | setContentView(R.layout.activity_login); 17 | } 18 | 19 | public void logInClicked(View view) { 20 | ((LoginFragment) getFragmentManager().findFragmentById(R.id.main_login_fragment)).loginClicked(); 21 | } 22 | } 23 | -------------------------------------------------------------------------------- /app/src/main/java/com/nilzor/presenterexample/ui/LoginFragment.java: -------------------------------------------------------------------------------- 1 | package com.nilzor.presenterexample.ui; 2 | 3 | import android.app.Fragment; 4 | import android.os.Bundle; 5 | import android.view.LayoutInflater; 6 | import android.view.View; 7 | import android.view.ViewGroup; 8 | 9 | import com.nilzor.presenterexample.R; 10 | import com.nilzor.presenterexample.databinding.FragmentLoginBinding; 11 | import com.nilzor.presenterexample.viewmodels.LoginFragmentViewModel; 12 | import com.nilzor.presenterexample.helpers.AppNavigator; 13 | import com.nilzor.presenterexample.helpers.ToastPresenter; 14 | 15 | public class LoginFragment extends Fragment { 16 | private FragmentLoginBinding mBinding; 17 | private LoginFragmentViewModel mViewModel; 18 | 19 | public LoginFragment() { 20 | } 21 | 22 | @Override 23 | public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 24 | View view = inflater.inflate(R.layout.fragment_login, container, false); 25 | mBinding = FragmentLoginBinding.bind(view); 26 | ToastPresenter toastPresenter = new ToastPresenter(getActivity().getApplicationContext()); 27 | AppNavigator navigator = new AppNavigator(getActivity()); 28 | mViewModel = new LoginFragmentViewModel(navigator, toastPresenter, getResources()); 29 | mBinding.setData(mViewModel); 30 | attachListeners(); 31 | return view; 32 | } 33 | 34 | @Override 35 | public void onViewCreated(View view, Bundle savedInstanceState) { 36 | ensureModelDataIsLodaded(); 37 | } 38 | 39 | private void attachListeners() { 40 | mBinding.existingOrNewUser.setOnCheckedChangeListener((group, checkedId) -> { 41 | uiToModel(); 42 | mViewModel.updateDependentViews(); 43 | }); 44 | } 45 | 46 | public void loginClicked() { 47 | uiToModel(); 48 | mViewModel.logInClicked(); 49 | } 50 | 51 | private void uiToModel() { 52 | mViewModel.isExistingUserChecked.set(mBinding.returningUserRb.isChecked()); 53 | mViewModel.password.set(mBinding.password.getText().toString()); 54 | mViewModel.username.set(mBinding.username.getText().toString()); 55 | } 56 | 57 | private void ensureModelDataIsLodaded() { 58 | if (!mViewModel.isLoaded()) { 59 | mViewModel.loadAsync(); 60 | } 61 | } 62 | } 63 | -------------------------------------------------------------------------------- /app/src/main/java/com/nilzor/presenterexample/ui/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.nilzor.presenterexample.ui; 2 | 3 | import android.os.Bundle; 4 | import android.support.v7.app.AppCompatActivity; 5 | 6 | import com.nilzor.presenterexample.R; 7 | 8 | public class MainActivity extends AppCompatActivity { 9 | 10 | @Override 11 | protected void onCreate(Bundle savedInstanceState) { 12 | super.onCreate(savedInstanceState); 13 | setContentView(R.layout.activity_main); 14 | } 15 | } 16 | -------------------------------------------------------------------------------- /app/src/main/java/com/nilzor/presenterexample/viewmodels/LoginFragmentViewModel.java: -------------------------------------------------------------------------------- 1 | package com.nilzor.presenterexample.viewmodels; 2 | 3 | import android.content.res.Resources; 4 | import android.databinding.ObservableField; 5 | import android.os.AsyncTask; 6 | import android.view.View; 7 | 8 | import com.nilzor.presenterexample.R; 9 | import com.nilzor.presenterexample.helpers.AppNavigator; 10 | import com.nilzor.presenterexample.helpers.ToastPresenter; 11 | 12 | import java.util.Random; 13 | 14 | public class LoginFragmentViewModel { 15 | public ObservableField numberOfUsersLoggedIn = new ObservableField<>(); 16 | public ObservableField isExistingUserChecked = new ObservableField<>(); 17 | public ObservableField emailBlockVisibility = new ObservableField<>(); 18 | public ObservableField loginOrCreateButtonText = new ObservableField<>(); 19 | public ObservableField username = new ObservableField<>(); 20 | public ObservableField password = new ObservableField<>(); 21 | public ObservableField passwordError = new ObservableField<>(); 22 | private boolean mIsLoaded; 23 | private AppNavigator mAppNavigator; 24 | private ToastPresenter mToastPresenter; 25 | private Resources mResources; 26 | 27 | public LoginFragmentViewModel(AppNavigator appNavigator, ToastPresenter toastPresenter, Resources resources) { 28 | mAppNavigator = appNavigator; 29 | mToastPresenter = toastPresenter; 30 | mResources = resources; // You might want to abstract this for testability 31 | setInitialState(); 32 | updateDependentViews(); 33 | hookUpDependencies(); 34 | } 35 | public boolean isLoaded() { 36 | return mIsLoaded; 37 | } 38 | 39 | private void setInitialState() { 40 | numberOfUsersLoggedIn.set("..."); 41 | isExistingUserChecked.set(true); 42 | } 43 | 44 | private void hookUpDependencies() { 45 | isExistingUserChecked.addOnPropertyChangedCallback(new android.databinding.Observable.OnPropertyChangedCallback() { 46 | @Override 47 | public void onPropertyChanged(android.databinding.Observable sender, int propertyId) { 48 | updateDependentViews(); 49 | } 50 | }); 51 | } 52 | 53 | public void updateDependentViews() { 54 | resetErrors(); 55 | if (isExistingUserChecked.get()) { 56 | emailBlockVisibility.set(View.GONE); 57 | loginOrCreateButtonText.set(mResources.getString(R.string.log_in)); 58 | } 59 | else { 60 | emailBlockVisibility.set(View.VISIBLE); 61 | loginOrCreateButtonText.set(mResources.getString(R.string.create_user)); 62 | } 63 | } 64 | 65 | public void loadAsync() { 66 | new AsyncTask() { 67 | @Override 68 | protected Void doInBackground(Void... params) { 69 | // Simulating some asynchronous task fetching data from a remote server 70 | try {Thread.sleep(2000);} catch (Exception ex) {}; 71 | numberOfUsersLoggedIn.set("" + new Random().nextInt(1000)); 72 | mIsLoaded = true; 73 | return null; 74 | } 75 | }.execute((Void) null); 76 | } 77 | 78 | public void logInClicked() { 79 | boolean isValid = validateInput(); 80 | if (isValid) { 81 | attemptLoginOrCreate(); 82 | } 83 | } 84 | 85 | /** Validate input data */ 86 | public boolean validateInput() { 87 | resetErrors(); 88 | if (!isExistingUserChecked.get()) { 89 | if (password.get().length() < 8) { 90 | passwordError.set("Password must be at least 8 characters long"); 91 | } 92 | else { 93 | } 94 | } 95 | return passwordError.get() == null; 96 | } 97 | 98 | public void attemptLoginOrCreate() { 99 | // Illustrating the need for calling back to the view though testable interfaces. 100 | boolean ok = true; 101 | if (isExistingUserChecked.get()) { 102 | if (!password.get().contains("a")) { 103 | mToastPresenter.showShortToast("Invalid username or password"); 104 | ok = false; 105 | } 106 | } 107 | if (ok) { 108 | mAppNavigator.gotoMainScreen(); 109 | } 110 | }; 111 | 112 | private void resetErrors() { 113 | passwordError.set(null); 114 | } 115 | } 116 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_login.xml: -------------------------------------------------------------------------------- 1 | 8 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 11 | 18 | 19 | 20 | -------------------------------------------------------------------------------- /app/src/main/res/layout/fragment_login.xml: -------------------------------------------------------------------------------- 1 | 3 | 4 | 5 | 6 | 14 | 15 | 21 | 22 | 28 | 29 | 37 | 38 | 44 | 45 | 51 | 52 | 53 | 54 | 60 | 61 | 68 | 69 | 75 | 76 | 77 | 84 | 85 | 91 | 92 | 100 | 101 | 102 | 103 | 110 | 111 | 117 | 118 | 124 | 125 | 126 |