public class MyObserver implements LifecycleObserver { public MyObserver(Lifecycle lifecycle) { // Starts lifecycle observation lifecycle.addObserver(this); ... } public void startFragmentTransaction() { // Queries lifecycle state if (lifecycle.getState.isAtLeast(STARTED)) { // perform transaction } } // Annotated methods called when the associated lifecycle goes through these events @OnLifecycleEvent(Lifecycle.Event.ON_RESUME) public void onResume() { } @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE) public void onPause() { } } MyObserver observer = new MyObserver(aLifecycleOwner.getLifecycle());
@Entity public class User { @PrimaryKey private int uid; private String name; // Getters and Setters - required for Room public int getUid() { return uid; } public String getName() { return name; } public void setUid(int uid) { this.uid = uid; } public void setName(String name) { this.name = name; } } @Dao public interface UserDao { @Query("SELECT * FROM user") List getAll(); @Insert void insertAll(User... users); } @Database(entities = {User.class}, version = 1) public abstract class AppDatabase extends RoomDatabase { public abstract UserDao userDao(); }
