如何在android studio中随时随地访问本地主机数据库

implementation 'androidx.room:room-runtime:2.3.0'
annotationProcessor 'androidx.room:room-compiler:2.3.0'

@Database(entities = {User.class}, version = 1)
public abstract class AppDatabase extends RoomDatabase {
    public abstract UserDao userDao();

    private static AppDatabase instance;

    public static synchronized AppDatabase getInstance(Context context) {
        if (instance == null) {
            instance = Room.databaseBuilder(context.getApplicationContext(),
                    AppDatabase.class, "app_database")
                    .build();
        }
        return instance;
    }
}

@Entity
public class User {
    @PrimaryKey
    public int id;

    public String name;
    // other fields and methods
}

@Dao
public interface UserDao {
    @Insert
    void insert(User user);

    @Query("SELECT * FROM user")
    List<User> getAllUsers();
    // other query and update methods
}

AppDatabase db = AppDatabase.getInstance(getApplicationContext());
UserDao userDao = db.userDao();

User user = new User();
user.id = 1;
user.name = "John";

userDao.insert(user);

List<User> users = userDao.getAllUsers();
// 处理查询结果