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Managing State with RxJava Jake Wharton

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Why Reactive? Unless you can model your entire system synchronously...

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Why Reactive? Unless you can model your entire system synchronously, a single asynchronous source breaks imperative programming.

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Why Reactive? interface UserManager { User getUser();
 }A

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Why Reactive? interface UserManager { User getUser(); void setName(String name); void setAge(int age);
 }A

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Why Reactive? interface UserManager { User getUser(); void setName(String name); void setAge(int age);
 }A UserManager um = new UserManager();

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Why Reactive? interface UserManager { User getUser(); void setName(String name); void setAge(int age);
 }A UserManager um = new UserManager(); System.out.println(um.getUser());

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Why Reactive? interface UserManager { User getUser(); void setName(String name); void setAge(int age);
 }A UserManager um = new UserManager(); System.out.println(um.getUser()); um.setName("Jane Doe");

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Why Reactive? interface UserManager { User getUser(); void setName(String name); void setAge(int age);
 }A UserManager um = new UserManager(); System.out.println(um.getUser()); um.setName("Jane Doe"); System.out.println(um.getUser());

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Why Reactive? interface UserManager { User getUser(); void setName(String name); // <-- now async void setAge(int age); // <-- now async
 }A

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Why Reactive? interface UserManager { User getUser(); void setName(String name); void setAge(int age);
 }A UserManager um = new UserManager(); System.out.println(um.getUser()); um.setName("Jane Doe"); System.out.println(um.getUser());

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Why Reactive? interface UserManager { User getUser(); void setName(String name, Runnable callback); void setAge(int age, Runnable callback);
 }A

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Why Reactive? interface UserManager { User getUser(); void setName(String name, Runnable callback);A void setAge(int age, Runnable callback);B
 }A UserManager um = new UserManager(); System.out.println(um.getUser()); um.setName("Jane Doe", () -> { System.out.println(um.getUser()); });

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Why Reactive? interface UserManager { User getUser(); void setName(String name, Listener listener);A void setAge(int age, Listener listener);B interface Listener { void success(User user); void failure(IOException e); }G
 }A

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Why Reactive? UserManager um = new UserManager(); System.out.println(um.getUser()); um.setName("Jane Doe");

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Why Reactive? UserManager um = new UserManager(); System.out.println(um.getUser()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { System.out.println(um.getUser()); }A @Override public void failure(IOException e) { // TODO show the error... }B });

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Why Reactive? UserManager um = new UserManager(); System.out.println(um.getUser()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { System.out.println(um.getUser()); }A @Override public void failure(IOException e) { // TODO show the error... }B }); um.setAge(40, new UserManager.Listener() { @Override public void success() { System.out.println(um.getUser()); }C 2@Override public void failure(IOException e) {2 2// TODO show the error...2 }D });2

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Why Reactive? UserManager um = new UserManager(); System.out.println(um.getUser()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { System.out.println(um.getUser()); um.setAge(40, new UserManager.Listener() { @Override public void success() { System.out.println(um.getUser()); }C 2@Override public void failure(IOException e) {2 2// TODO show the error...2 }D });2 }A @Override public void failure(IOException e) { // TODO show the error... }B });

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Why Reactive? public final class UserActivity extends Activity { private final UserManager um = new UserManager(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.user); TextView tv = (TextView) findViewById(R.id.user_name); tv.setText(um.getUser().toString()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { tv.setText(um.getUser().toString()); }A @Override public void failure(IOException e) { // TODO show the error... }B }); }Y }Z

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Why Reactive? public final class UserActivity extends Activity { private final UserManager um = new UserManager(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.user); TextView tv = (TextView) findViewById(R.id.user_name); tv.setText(um.getUser().toString()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { tv.setText(um.getUser().toString()); }A @Override public void failure(IOException e) { // TODO show the error... }B }); }Y }Z

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Why Reactive? public final class UserActivity extends Activity { private final UserManager um = new UserManager(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.user); TextView tv = (TextView) findViewById(R.id.user_name); tv.setText(um.getUser().toString()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { if (isDestroyed()) { tv.setText(um.getUser().toString()); } }A @Override public void failure(IOException e) { // TODO show the error... }B }); }Y }Z

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Why Reactive? public final class UserActivity extends Activity { private final UserManager um = new UserManager(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.user); TextView tv = (TextView) findViewById(R.id.user_name); tv.setText(um.getUser().toString()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { if (isDestroyed()) { tv.setText(um.getUser().toString()); } }A @Override public void failure(IOException e) { // TODO show the error... }B }); }Y }Z

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Why Reactive? public final class UserActivity extends Activity { private final UserManager um = new UserManager(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.user); TextView tv = (TextView) findViewById(R.id.user_name); tv.setText(um.getUser().toString()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { if (isDestroyed()) { tv.setText(um.getUser().toString()); }L }A @Override public void failure(IOException e) { // TODO show the error... }B }); }Y }Z

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Why Reactive? public final class UserActivity extends Activity { private final UserManager um = new UserManager(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.user); TextView tv = (TextView) findViewById(R.id.user_name); tv.setText(um.getUser().toString()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { runOnUiThread(new Runnable() { @Override public void run() { if (isDestroyed()) { tv.setText(um.getUser().toString()); }L }4 }); }A @Override public void failure(IOException e) { // TODO show the error... }B }); }Y }Z

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Why Reactive? public final class UserActivity extends Activity { private final UserManager um = new UserManager(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.user); TextView tv = (TextView) findViewById(R.id.user_name); tv.setText(um.getUser().toString()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { runOnUiThread(new Runnable() { @Override public void run() { if (isDestroyed()) { tv.setText(um.getUser().toString()); } }4 }); }A @Override public void failure(IOException e) { // TODO show the error... }B }); }Y }Z

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Why Reactive? GET / 200 OK SELECT * Jane Doe setText onClick

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Why Reactive? GET / 200 OK SELECT * Jane Doe setText onClick

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Why Reactive? GET / 200 OK SELECT * Jane Doe setText onClick

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Why Reactive? GET / 200 OK SELECT * Jane Doe setText onClick

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Why Reactive? GET / 200 OK SELECT * Jane Doe setText onClick

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Why Reactive? GET / 200 OK SELECT * Jane Doe setText onClick SELECT * Jane Doe setText UPDATE user Jane Doe setText

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Why Reactive?

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Why Reactive? Unless you can model your entire system synchronously, a single asynchronous source breaks imperative programming.

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Why Reactive?

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Why Reactive?

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Why Reactive?

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Why Reactive?

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Why Reactive?

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Why Reactive?

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interface UserManager { User getUser(); void setName(String name); void setAge(int age);
 }A Being Reactive

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Being Reactive interface UserManager { Observable getUser(); void setName(String name); void setAge(int age);
 }A

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Being Reactive interface UserManager { Observable getUser(); Completable setName(String name); Completable setAge(int age);
 }A void void


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Being Reactive um.getUser()

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Being Reactive um.getUser() .observeOn(AndroidSchedulers.mainThread())

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Being Reactive um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver() { @Override public void onNext(User user) { }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } });

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Being Reactive um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } });2

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Being Reactive disposables.add(um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } }));2

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Being Reactive // onCreate disposables.add(um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } })); // onDestroy disposables.dispose();

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Being Reactive um.setName("Jane Doe")

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Being Reactive um.setName("Jane Doe") .subscribeOn(Schedulers.io())

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Being Reactive um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread())

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Being Reactive um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { }1 @Override public void onError(Throwable t) { // retry or show }2 });

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Being Reactive um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { // success! re-enable editing }1 @Override public void onError(Throwable t) { // retry or show }2 });3

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Being Reactive disposables.add(um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { // success! re-enable editing }1 @Override public void onError(Throwable t) { // retry or show }2 }));3

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Being Reactive // onCreate disposables.add(um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } })); // onDestroy disposables.dispose(); // button click listener disposables.add(um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { // success! re-enable editing }1 @Override public void onError(Throwable t) { // retry or show }2 }));3

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Being Reactive // onCreate disposables.add(um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } })); // onDestroy disposables.dispose(); // button click listener disposables.add(um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { // success! re-enable editing }1 @Override public void onError(Throwable t) { // retry or show }2 }));3 Push-based updates

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Being Reactive // onCreate disposables.add(um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } })); // onDestroy disposables.dispose(); // button click listener disposables.add(um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { // success! re-enable editing }1 @Override public void onError(Throwable t) { // retry or show }2 }));3 Push-based updates Declarative threading

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Being Reactive // onCreate disposables.add(um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } })); // onDestroy disposables.dispose(); // button click listener disposables.add(um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { // success! re-enable editing }1 @Override public void onError(Throwable t) { // retry or show }2 }));3 Push-based updates Declarative threading Easy error-handling

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Being Reactive // onCreate disposables.add(um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } })); // onDestroy disposables.dispose(); // button click listener disposables.add(um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { // success! re-enable editing }1 @Override public void onError(Throwable t) { // retry or show }2 }));3 Push-based updates Declarative threading Easy error-handling Specialized callbacks

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Being Reactive // onCreate disposables.add(um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } })); // onDestroy disposables.dispose(); // button click listener disposables.add(um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { // success! re-enable editing }1 @Override public void onError(Throwable t) { // retry or show }2 }));3 Push-based updates Declarative threading Easy error-handling Specialized callbacks Lifecycle cancelation

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Managing State Enter name: SUBMIT

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Managing State Enter name: SUBMIT Jane Doe

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Managing State Enter name: SUBMIT Jane Doe

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Managing State Enter name: SUBMIT

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Managing State getText()

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Managing State subscribe(…)

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Managing State doOnNext(…)

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Managing State doOnNext(…) doOnNext(…)

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Managing State getText()

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Managing State flatMap(…)

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Managing State doOnNext(…)

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Managing State subscribe(…)

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Managing State doOnNext(…) doOnNext(…) subscribe(…)

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Managing State doOnNext(…) doOnNext(…) subscribe(…)

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Managing State doOnNext(…) doOnNext(…) subscribe(…)

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Managing State subscribe(ignored -> …)

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Managing State subscribe((SubmitUiModel model) -> …) ignored

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Reactive State

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Reactive State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Reactive State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString()))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> nameView.getText().toString())Y .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(name -> service.setName(name))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString()))Y .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(event -> service.setName(event.name))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); })); name

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString()))Y .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(event -> service.setName(event.name))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString()))Y .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(event -> service.setName(event.name))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString()))Y .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(event -> service.setName(event.name))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Reactive State final class SubmitUiModel { final boolean inProgress; final boolean success; final String errorMessage; private SubmitUiModel( boolean inProgress, boolean success, String errorMessage) { // ... } static SubmitUiModel inProgress() { /* ... */ } static SubmitUiModel success() { /* ... */ } static SubmitUiModel failure(String errorMessage) { /* ... */ } }

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Reactive State final class SubmitUiModel { final boolean inProgress; final boolean success; final String errorMessage; private SubmitUiModel( boolean inProgress, boolean success, String errorMessage) { // ... } static SubmitUiModel inProgress() { /* ... */ } static SubmitUiModel success() { /* ... */ } static SubmitUiModel failure(String errorMessage) { /* ... */ } }

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(event -> service.setName(event.name))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(event -> service.setName(event.name))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .doOnNext(ignored -> { SubmitUiModel.inProgress() }) .flatMap(event -> service.setName(event.name))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); })); .startWith( submitView.setEnabled(false); progressView.setVisibility(VISIBLE);

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .startWith(SubmitUiModel.inProgress()))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .startWith(SubmitUiModel.inProgress()))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Reactive State final class SubmitUiModel { final boolean inProgress; final boolean success; final String errorMessage; private SubmitUiModel( boolean inProgress, boolean success, String errorMessage) { // ... } static SubmitUiModel inProgress() { /* ... */ } static SubmitUiModel success() { /* ... */ } static SubmitUiModel failure(String errorMessage) { /* ... */ } }

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Reactive State final class SubmitUiModel { final boolean inProgress; final boolean success; final String errorMessage; private SubmitUiModel( boolean inProgress, boolean success, String errorMessage) { // ... } static SubmitUiModel inProgress() { /* ... */ } static SubmitUiModel success() { /* ... */ } static SubmitUiModel failure(String errorMessage) { /* ... */ } }

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); })); progressView.setVisibility(GONE) .doOnNext(ignored -> )

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .subscribe(s -> finish(), t -> {})); submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + , LENGTH_SHORT).show();

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .subscribe(s -> finish(), t -> {}));

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .subscribe(s -> finish(), t -> {}));

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); } }, t -> {})); s

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); }X }, t -> {}));

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));

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Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())) .subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));

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Reactive State Observable events = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); disposables.add(events.flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())) .subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));

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Reactive State Observable events = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); Observable models = events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(models.subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));

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Reactive State Observable events = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); ObservableTransformer submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(events.compose(submit).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); })); models models

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Reactive State Observable events = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); ObservableTransformer submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(events.compose(submit).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));

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Reactive State ObservableTransformer submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); .compose(submit) .subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));

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Reactive State ObservableTransformer submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); .compose(submit) .subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));

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Reactive State Observable events = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); ObservableTransformer submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(events.compose(submit).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));

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Reactive State Observable events = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); ObservableTransformer submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(events.compose(submit).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));

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Reactive State class SubmitEventZ{ /* ... */ } Observable events = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); ObservableTransformer submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage()) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(events.compose(submit).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));

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Reactive State abstract class SubmitUiEvent {} class SubmitEventZextends SubmitUiEventY{ /* ... */ } class CheckNameEvent extends SubmitUiEvent { /* ... */ } Observable submitEvents = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); e

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Reactive State abstract class SubmitUiEvent {} class SubmitEventZextends SubmitUiEventY{ /* ... */ } class CheckNameEvent extends SubmitUiEvent { /* ... */ } Observable submitEvents = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); Observable checkNameEvents = RxTextView.afterTextChanges(nameView) .map(text -> new CheckNameEvent(text));

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Reactive State abstract class SubmitUiEvent {} class SubmitEventZextends SubmitUiEventY{ /* ... */ } class CheckNameEvent extends SubmitUiEvent { /* ... */ } Observable submitEvents = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); Observable checkNameEvents = RxTextView.afterTextChanges(nameView) .map(text -> new CheckNameEvent(text)); Observable events = Observable.merge(submitEvents, checkNameEvents);

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Reactive State Observable events = /* ... */; ObservableTransformer submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(events.compose(submit).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); })); abstract class SubmitUiEvent {} O b s e r v a b l e . m e r g e ( s u b m i t E v e n t s , c h e c k N a m e E v e n t s ) class SubmitEventZextends SubmitUiEventY{ /* ... */ } class CheckNameEvent extends SubmitUiEvent { /* ... */ } Observable submitEvents = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); Observable checkNameEvents = RxTextView.afterTextChanges(nameView) .map(text -> new CheckNameEvent(text));

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Reactive State Observable events = /* ... */; ObservableTransformer submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(events.compose(submit).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));

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Reactive State ObservableTransformer submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()));

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Reactive State ObservableTransformer submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); ObservableTransformer checkName = events -> events .switchMap(event -> event .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(event -> service.checkName(event.name)) .map(response -> ???) .onErrorReturn(t -> ???) .observeOn(AndroidSchedulers.mainThread()) .startWith(???));

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Reactive State ObservableTransformer submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); ObservableTransformer checkName = events -> events .switchMap(event -> event .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(event -> service.checkName(event.name)) .map(response -> ???) .onErrorReturn(t -> ???) .observeOn(AndroidSchedulers.mainThread()) .startWith(???));

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Reactive State ObservableTransformer submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); ObservableTransformer checkName = events -> events .switchMap(event -> event .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(event -> service.checkName(event.name)) .map(response -> ???) .onErrorReturn(t -> ???) .observeOn(AndroidSchedulers.mainThread()) .startWith(???));

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Reactive State ObservableTransformer submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); ObservableTransformer checkName = events -> events .switchMap(event -> event .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(event -> service.checkName(event.name)) .map(response -> ???) .onErrorReturn(t -> ???) .observeOn(AndroidSchedulers.mainThread()) .startWith(???));

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Reactive State ObservableTransformer submit = /* ... */; ObservableTransformer checkName = /* ... */;

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Reactive State ObservableTransformer submit = /* ... */; ObservableTransformer checkName = /* ... */; ObservableTransformer submitUi = events -> ???;

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Reactive State ObservableTransformer submit = /* ... */; ObservableTransformer checkName = /* ... */; ObservableTransformer submitUi = events -> ???; events

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Reactive State ObservableTransformer submit = /* ... */; ObservableTransformer checkName = /* ... */; ObservableTransformer submitUi = events -> ???; events checkName submit

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Reactive State ObservableTransformer submit = /* ... */; ObservableTransformer checkName = /* ... */; ObservableTransformer submitUi = events -> ???; events models checkName submit

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Reactive State ObservableTransformer submit = /* ... */; ObservableTransformer checkName = /* ... */; ObservableTransformer submitUi = events -> ???; events models checkName submit Observable.merge(…)

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Reactive State ObservableTransformer submit = /* ... */; ObservableTransformer checkName = /* ... */; ObservableTransformer submitUi = events -> ???; events models checkName submit Observable.merge(…) Observable.publish(…);

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Reactive State ObservableTransformer submit = /* ... */; ObservableTransformer checkName = /* ... */; ObservableTransformer submitUi = events -> ???; Observable.merge(…) Observable.publish(…);

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Reactive State ObservableTransformer submit = /* ... */; ObservableTransformer checkName = /* ... */; ObservableTransformer submitUi = events -> events.publish(shared -> Observable.merge( );Z …) Observable …ZG

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Reactive State ObservableTransformer submit = /* ... */; ObservableTransformer checkName = /* ... */; ObservableTransformer submitUi = events -> events.publish(shared -> Observable.merge( shared.ofType(SubmitEvent.class).compose(submit), shared.ofType(CheckNameEvent.class).compose(checkName)));

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Reactive State Observable events = /* ... */; ObservableTransformer submitUi = events -> events.publish(shared -> Observable.merge( shared.ofType(SubmitEvent.class).compose(submit), shared.ofType(CheckNameEvent.class).compose(checkName))); disposables.add(events.compose(submitUi).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); })); ObservableTransformer submit = /* ... */; ObservableTransformer checkName = /* ... */;

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Reactive State Observable events = /* ... */; ObservableTransformer submitUi = events -> events.publish(shared -> Observable.merge( shared.ofType(SubmitEvent.class).compose(submit), shared.ofType(CheckNameEvent.class).compose(checkName))); disposables.add(events.compose(submitUi).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));

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Reactive State Observable events = /* ... */; ObservableTransformer submitUi = events -> events.publish(shared -> Observable.merge( shared.ofType(SubmitEvent.class).compose(submit), shared.ofType(CheckNameEvent.class).compose(checkName))); disposables.add(events.compose(submitUi).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); })); ObservableTransformer submit = /* ... */; ObservableTransformer checkName = /* ... */;

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Reactive State

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Reactive State

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Reactive State Observable

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Reactive State Observable Observable

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Reactive State Observable Observable Observable

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Reactive State Observable Observable Observable Observable

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Reactive State Observable Observable Observable Observable UiEventZ

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Reactive State Observable Observable Observable Observable UiModelZ

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Reactive State Observable Observable Observable Observable

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Reactive State Observable Observable Observable Observable

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Reactive State Observable Observable Observable Observable

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Reactive State final class SubmitUiModel { final boolean inProgress; final boolean success; final String errorMessage; private SubmitUiModel( boolean inProgress, boolean success, String errorMessage) { // ... } static SubmitUiModel inProgress() { /* ... */ } static SubmitUiModel success() { /* ... */ } static SubmitUiModel failure(String errorMessage) { /* ... */ } }

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Reactive State inProgress false success false errorMessage null

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Reactive State inProgress false success false errorMessage null CheckNameResult.IN_FLIGHT

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Reactive State inProgress false success false errorMessage null CheckNameResult.IN_FLIGHT inProgress true success false errorMessage null CheckNameResult.SUCC

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Reactive State rogress se cess se orMessage l CheckNameResult.IN_FLIGHT inProgress true success false errorMessage null CheckNameResult.SUCCESS i f s f e n

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Reactive State ckNameResult.IN_FLIGHT inProgress true success false errorMessage null CheckNameResult.SUCCESS inProgress false success false errorMessage null Ch

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Reactive State rogress e cess se orMessage l CheckNameResult.SUCCESS inProgress false success false errorMessage null CheckNameResult.IN_FLIGHT i t s f e n

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Reactive State ckNameResult.SUCCESS inProgress false success false errorMessage null CheckNameResult.IN_FLIGHT inProgress true success false errorMessage null Su

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Reactive State nProgress alse uccess alse rrorMessage ull CheckNameResult.IN_FLIGHT inProgress true success false errorMessage null SubmitResult.IN_FLIGHT i t s f e n

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Reactive State eckNameResult.IN_FLIGHT inProgress true success false errorMessage null SubmitResult.IN_FLIGHT inProgress true success false errorMessage null Su

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Reactive State T inProgress true success false errorMessage null SubmitResult.IN_FLIGHT inProgress true success false errorMessage null SubmitResult.SUCCESS i f s t e n

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Reactive State SubmitResult.IN_FLIGHT inProgress true success false errorMessage null SubmitResult.SUCCESS inProgress false success true errorMessage null

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Reactive State SubmitUiModel initialState = SubmitUiModel.idle();

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Reactive State SubmitUiModel initialState = SubmitUiModel.idle(); Observable results = /* ... */;

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Reactive State SubmitUiModel initialState = SubmitUiModel.idle(); Observable results = /* ... */; Observable uiModels = results .scan(initialState, (state, result) -> /* ... */);

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Reactive State SubmitUiModel initialState = SubmitUiModel.idle(); Observable results = /* ... */; Observable uiModels = results .scan(initialState, (state, result) -> { if (result == CheckNameResult.IN_FLIGHT || result == SubmitResult.IN_FLIGHT) return SubmitUiModel.inProgress(); if (result == CheckNameResult.SUCCESS) return SubmitUiModel.idle(); if (result == SubmitResult.SUCCESS) return SubmitUiModel.success(); // TODO handle check name and submit failures... throw new IllegalArgumentException("Unknown result: " + result); }); /* ... */

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Reactive State ObservableTransformer submit = events -> events.flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); ObservableTransformer checkName = events -> events.switchMap(event -> event .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(event -> service.checkName(event.name)) .map(response -> ???) .onErrorReturn(t -> ???) .observeOn(AndroidSchedulers.mainThread()) .startWith(???));

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Reactive State ObservableTransformer submit = actions -> actions.flatMap(action -> service.setName(action.name) .map(response -> SubmitUiModel.success())A .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage()))B .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); ObservableTransformer checkName = actions -> actions.switchMap(action -> action .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(action -> service.checkName(action.name)) .map(response -> ???)Y .onErrorReturn(t -> ???)Z .observeOn(AndroidSchedulers.mainThread()) .startWith(???)); SubmitEvent SubmitUiModel events events event event CheckNameEvent SubmitUiModel events events event event event event

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Reactive State ObservableTransformer submit = actions -> actions.flatMap(action -> service.setName(action.name) .map(response -> SubmitUiModel.success())A .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage()))B .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); ObservableTransformer checkName = actions -> actions.switchMap(action -> action .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(action -> service.checkName(action.name)) .map(response -> ???)Y .onErrorReturn(t -> ???)Z .observeOn(AndroidSchedulers.mainThread()) .startWith(???));

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Reactive State ObservableTransformer submit = actions -> actions.flatMap(action -> service.setName(action.name) .map(response -> SubmitResult.SUCCESS)A .onErrorReturn(t -> SubmitResult.failure(t.getMessage()))B .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitResult.IN_FLIGHT)); ObservableTransformer checkName = actions -> actions.switchMap(action -> action .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(action -> service.checkName(action.name)) .map(response -> CheckNameResult.SUCCESS)Y .onErrorReturn(t -> CheckNameResult.failure(t.getMessage()))Z .observeOn(AndroidSchedulers.mainThread()) .startWith(CheckNameResult.IN_FLIGHT)); SubmitUiModel.success() SubmitUiModel.failure(t.getMessage()) SubmitUiModel.inProgress() ??? ??? ???

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Reactive State ObservableTransformer submit = actions -> actions.flatMap(action -> service.setName(action.name) .map(response -> SubmitResult.SUCCESS)A .onErrorReturn(t -> SubmitResult.failure(t.getMessage()))B .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitResult.IN_FLIGHT)); ObservableTransformer checkName = actions -> actions.switchMap(action -> action .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(action -> service.checkName(action.name)) .map(response -> CheckNameResult.SUCCESS)Y .onErrorReturn(t -> CheckNameResult.failure(t.getMessage()))Z .observeOn(AndroidSchedulers.mainThread()) .startWith(CheckNameResult.IN_FLIGHT));

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Observable Observable Observable Observable Log.d

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Observable Observable Observable Observable Log.d

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Observable Observable Observable Observable Subject TestObserver

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Observable Observable Observable Observable

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Observable Observable TestObserver Subject

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Observable Observable Observable Observable Redux / Cycle

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jakewharton jakewharton jakewharton twitter.com/ github.com/ .com Managing State with RxJava