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Update LiveData value when becoming active #6301

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Update LiveData value when becoming active #6301

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2b555bb
Update LiveData value when becoming active
RemiLatapy Nov 15, 2018
0fe3392
store object in the ctor to set it when becoming active for the first…
RemiLatapy Dec 2, 2018
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10 changes: 8 additions & 2 deletions ...tureComponentsExample/src/main/java/io/realm/examples/arch/livemodel/LiveRealmObject.java
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,9 @@
* @param <T> the type of the RealmModel
*/
public class LiveRealmObject<T extends RealmModel> extends LiveData<T> {
// The listener will listen until the object is deleted.
private final T object;

// The listener will listen until the object is deleted.
// An invalidated object shouldn't be set in LiveData, null is set instead.
private RealmObjectChangeListener<T> listener = new RealmObjectChangeListener<T>() {
@Override
Expand Down Expand Up @@ -72,7 +74,7 @@ public LiveRealmObject(@NonNull T object) {
if (!RealmObject.isValid(object)) {
throw new IllegalArgumentException("The provided RealmObject is no longer valid, and therefore cannot be observed for changes.");
}
setValue(object);
this.object = object;
}

// We should start observing and stop observing, depending on whether we have observers.
Expand All @@ -87,7 +89,11 @@ protected void onActive() {
super.onActive();
T object = getValue();
if (object != null && RealmObject.isValid(object)) {
setValue(object);
RealmObject.addChangeListener(object, listener);
} else if (RealmObject.isValid(this.object)) {
setValue(this.object);
RealmObject.addChangeListener(this.object, listener);
}
}

Expand Down