如何在Android的Firestore数据库中获取文档ID或名称以传递到其他活动?

问题描述

我正在使用FirestoreRecyclerAdapter.

我能够获取文档的每个模型和属性.但我想获取文档ID.

I'm able to get each model and attributes of documents. But I want to get the document id.

我尝试使用model.自动提示，但是没有文档ID或名称

I tried using model. Autosuggestions, but there was no document id or name

我有以下DealsHolder类.这是在科特林.但是其余所有类都在java中.

I have the following DealsHolder class. This is in Kotlin. However the rest of all the classes are in java.

package com.guidoapps.firestorerecycleradaptersample


import com.google.firebase.firestore.IgnoreExtraProperties

@IgnoreExtraProperties
data class DealsResponse(var title:String? = null,
                var price:String? = null,
                var dealPrice:String? = null,
                var image:String? = null,
                var description: String? = null)

我在onCreate()中初始化的以下函数

The following function which I initialize in onCreate()

 private void getDealsList(){
        Query query = db.collection("deals").orderBy("dateTime", Query.Direction.DESCENDING);

        FirestoreRecyclerOptions<DealsResponse> response = new FirestoreRecyclerOptions.Builder<DealsResponse>()
                .setQuery(query, DealsResponse.class)
                .build();

        adapter = new FirestoreRecyclerAdapter<DealsResponse, MainActivity.DealsHolder>(response) {
            @Override
            public void onBindViewHolder(MainActivity.DealsHolder holder, int position, DealsResponse model) {
                progressBar.setVisibility(View.GONE);
                holder.textTitle.setText(model.getTitle());
                holder.textPrice.setText(model.getPrice());
                holder.textDesc.setText(model.getDescription());
                holder.textDealPrice.setText(model.getDealPrice());

                holder.textPrice.setPaintFlags(holder.textPrice.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);

                Glide.with(getApplicationContext())
                        .load(model.getImage())
                        .into(holder.imageView);

                holder.itemView.setOnClickListener(v -> {
                    Snackbar.make(DealsList, model.getTitle(), Snackbar.LENGTH_LONG)
                            .setAction("Action", null).show();

                });
            }

在holder.itemView onClickListener中，我想获取文档ID以便传递给另一个活动

然后选择以下DealsHolder.

Then the following DealsHolder.

public class DealsHolder extends RecyclerView.ViewHolder {
    @BindView(R.id.title)
    TextView textTitle;
    @BindView(R.id.thumbnail)
    ImageView imageView;
    @BindView(R.id.description)
    TextView textDesc;
    @BindView(R.id.price)
    TextView textPrice;
    @BindView(R.id.dealPrice)
    TextView textDealPrice;

    public DealsHolder(View itemView) {
        super(itemView);
        ButterKnife.bind(this, itemView);
    }
}

推荐答案

使用适配器的getSnapshots()方法:

@Override
public void onBindViewHolder(MainActivity.DealsHolder holder, int position, DealsResponse model) {
    // ...
    holder.itemView.setOnClickListener(v -> {
        DocumentSnapshot snapshot = getSnapshots().getSnapshot(holder.getAdapterPosition());
        snapshot.getId();
        // ...
    });
}

getId() 方法返回文档的ID，因此在collection/myDoc/someField中，myDoc将是该ID.

The getId() method returns the document's id, so in collection/myDoc/someField, myDoc would be the id.

如果您知道下一个活动中的数据结构，则可以通过标准的firestore.collection("foo").document("bar")方法重新创建具有该ID的引用.如果您正在寻找一般的解决方案，请使用getPath()一堆:

If you know your data structure in the next activity, you can recreate the reference with that id through the standard firestore.collection("foo").document("bar") methods. If you're looking for the general solution, I use getPath() a bunch:

fun Bundle.putRef(ref: DocumentReference) = putString(REF_KEY, ref.path)

fun Bundle.getRef() = FirebaseFirestore.getInstance().document(getString(REF_KEY))

如果要在模型中使用ID，请使用自定义SnapshotParser:

If you want the id in your model, use a custom SnapshotParser:

val options = FirestoreRecyclerOptions.Builder<DealsResponse>()
        .setQuery(query) {
            it.toObject(DealsResponse::class.java).apply { id = it.id }
        }
        .build()

这篇关于如何在Android的Firestore数据库中获取文档ID或名称以传递到其他活动?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！