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public class EventLiveData extends LiveData<Object> {

    private final int mSubject;
    private final LifecycleRegistryOwner mLifecycle;

    public EventLiveData(@LiveDataBus.Subject int subject, @NonNull LifecycleRegistryOwner lifecycle) {
        mSubject = subject;
        mLifecycle = lifecycle;
    }

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public final class LiveDataBus {

    private static SparseArray<Map<LifecycleRegistryOwner, EventLiveData>> sSubjectMap = new SparseArray<>();

    public static final int SUBJECT_DATA_LOADED = 0, SUBJECT_DOWNLOAD_COMPLETE = 1;

    @Retention(SOURCE)
    @IntDef({SUBJECT_DATA_LOADED, SUBJECT_DOWNLOAD_COMPLETE})
    @interface Subject {
    }

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Zoo myZoo = new Zoo();

Animal elephant = new Animal();
Animal giraffe = new Animal();

// To-one relation: Set the Zoo that an animal belongs to and save it to the database
elephant.zoo.setTarget(myZoo);
animalBox.put(elephant);

// To-one relation: Get the Zoo that an animal belongs to

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@Entity
public class Zoo {

    @Id
    private long id;


    // a Zoo can have many Animals
    @Backlink
    ToMany<Animal> animals;

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BoxStore boxStore = App.getApp().getBoxStore();
Box<Animal> animalBox = boxStore.boxFor(Animal.class);

// loads all animals
List<Animal> animals = animalBox.getAll();

// find a specific animal in the database
long myDogId = 12;
Animal myDog = animalBox.get(myDogId);

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public class App extends Application {

    private static App sApp;
    private BoxStore mBoxStore;

    @Override
    public void onCreate() {
        super.onCreate();
        sApp = this;
        mBoxStore = MyObjectBox.builder().androidContext(App.this).build();

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@Entity
public class Animal {
    @Id(assignable = true)
    private long id;

    private String name;

    private boolean flying;

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<android.support.constraint.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <android.support.constraint.Guideline
        android:id="@+id/guideline1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.25"/>

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<android.support.constraint.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintLeft_toLeftOf="parent"
        android:background="@android:color/holo_blue_bright"

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<RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:background="@android:color/holo_blue_bright"