小编End*_*der的帖子

我正在编写一个应用程序来测试firebase,用户可以在其中列出带有图像的产品.我有上传的问题,因为虽然图片存储,但它们没有链接到产品(图像数组没有被传递？)和LeakCanary发出了一个内存错误信号.所有帮助和输入赞赏.

这是我的产品型号

@IgnoreExtraProperties
public class Product {

    public String uid;
    public String seller;
    public String name;
    public String description;
    public String city;
    public double price = 0.0;
    public List<Uri> images = new ArrayList<>();

    public Product () {

    }

    public Product(String uid, String seller, String name, String description, String city, double price, List<Uri> images) {
        this.uid = uid;
        this.seller = seller;
        this.name = name;
        this.description = description;
        this.city = city;
        this.price = price;
        this.images = images;
    }

    // [START post_to_map]
    @Exclude …

我目前正在使用Firebase编写Android应用程序.我有一个具有城市属性的产品型号.我正在运行以下查询:

mDatabaseReference = FirebaseDatabase.getInstance().getReference();
mDatabaseReference.keepSynced(true);

productQuery = mDatabaseReference.child("products")
                   .orderByChild("city").equalTo(mCurrentUser).limitToFirst(100);

无论城市如何,此查询都会检索数据库中的所有产品.

我花了最后四个小时审查关于SO的类似问题,并尝试查询函数的不同组合+规则索引无济于事.我有一个我称之为愚蠢的解决方案,它重新复制城市产品树下的数据.但是我猜测有一个更好的方法来利用orderByChild,如果我能得到一些帮助来查询城市数据,我将不胜感激.

感谢您的输入

这是CityFeed片段 - 注意:我检查了mCurrentUserCity已设置

public class CityFeedFragment extends BaseFragment {
    private RecyclerView mRecyclerView;
    private String mCurrentUserCity;
    private FirebaseProductAdapter mAdapter;
    private DatabaseReference mDatabaseReference;
    private LinearLayoutManager mManager;
    private Query productQuery;
    private SwipeRefreshLayout mSwipeRefreshLayout;

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_feed, container, false);
        mDatabaseReference = FirebaseDatabase.getInstance().getReference();
        mDatabaseReference.keepSynced(true);

        retrieveCity();
        fetchProducts();

        mAdapter = new FirebaseProductAdapter(Product.class, …