Replace Observable.create with Observable.fromEmitter

Author: Plastix

app/src/main/java/agency/tango/databindingrxjava/MainActivity.java

@@ -1,5 +1,6 @@
 package agency.tango.databindingrxjava;
 
+import android.app.Activity;
 import android.databinding.DataBindingUtil;
 import android.databinding.ObservableBoolean;
 import android.databinding.ObservableField;

app/src/main/java/agency/tango/databindingrxjava/RxUtils.java

@@ -4,10 +4,8 @@
 import android.databinding.ObservableField;
 import android.support.annotation.NonNull;
 
+import rx.AsyncEmitter;
 import rx.Observable;
-import rx.Subscriber;
-import rx.functions.Action0;
-import rx.subscriptions.Subscriptions;
 
 import static android.databinding.Observable.OnPropertyChangedCallback;
 
@@ -17,29 +15,21 @@ private RxUtils() {
     }
 
     public static <T> Observable<T> toObservable(@NonNull final ObservableField<T> observableField) {
-        return Observable.create(new Observable.OnSubscribe<T>() {
-            @Override
-            public void call(final Subscriber<? super T> subscriber) {
-                subscriber.onNext(observableField.get());
-
-                final OnPropertyChangedCallback callback = new OnPropertyChangedCallback() {
-                    @Override
-                    public void onPropertyChanged(android.databinding.Observable dataBindingObservable, int propertyId) {
-                        if (dataBindingObservable == observableField) {
-                            subscriber.onNext(observableField.get());
-                        }
+        return Observable.fromEmitter(asyncEmitter -> {
+
+            final OnPropertyChangedCallback callback = new OnPropertyChangedCallback() {
+                @Override
+                public void onPropertyChanged(android.databinding.Observable dataBindingObservable, int propertyId) {
+                    if (dataBindingObservable == observableField) {
+                        asyncEmitter.onNext(observableField.get());
                     }
-                };
+                }
+            };
 
-                observableField.addOnPropertyChangedCallback(callback);
+            observableField.addOnPropertyChangedCallback(callback);
 
-                subscriber.add(Subscriptions.create(new Action0() {
-                    @Override
-                    public void call() {
-                        observableField.removeOnPropertyChangedCallback(callback);
-                    }
-                }));
-            }
-        });
+            asyncEmitter.setCancellation(() -> observableField.removeOnPropertyChangedCallback(callback));
+
+        }, AsyncEmitter.BackpressureMode.LATEST);
     }
 }