Hi.I addCallback like this,but it's not call onCreate(), But onOpen() .it's have.Please tell me why.Thanks a lot

[HarryHaiVn]

return RoomAsset.databaseBuilder(appContext, AppDatabase.class, DATABASE_NAME) .addCallback(new Callback() { @Override public void onCreate(@NonNull SupportSQLiteDatabase db) { super.onCreate(db); Log.d("RoomAsset:------", "onCreate"); }

                @Override
                public void onOpen(@NonNull SupportSQLiteDatabase db) {
                    super.onOpen(db);
                    Log.d("RoomAsset:------", "onOpen");
                }
            })
            .build();

[humazed]

Because the creation of the database and the migration happens before onCreate has a chance to be called.

so after the method databaseBuilder is called the database is guaranteed to be created and you can perform your logic there.

I'm curious, why you need to know when the DB is created?