是否可以在FirestoreRecyclerOptions中使用Algolia查询?

Kme*_*mel 0 android google-cloud-firestore

为了让我的用户执行更复杂的搜索,我正在与Algolia合作。

com.algolia.search.saas.Query algolia_query =
                    new com.algolia.search.saas.Query(mLastQuery)
                    .setAttributesToRetrieve("content")
                    .setAttributesToRetrieve("category")
                    .setHitsPerPage(10);
            index.searchAsync(algolia_query, new CompletionHandler() {
                @Override
                public void requestCompleted(JSONObject jsonObject, AlgoliaException e) {
                    Log.d("algolia", jsonObject.toString());
                }
            });
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我想将此jsonObject转换为兼容的东西,FirestoreRecyclerOptions以便能够使用FirestoreRecyclerAdapter

谢谢 !

Ale*_*amo 6

为了更好地理解,我将尝试通过一个示例对此进行解释。假设我们有一个FirebaseFirestore指向数据库根引用的CollectionReference对象和一个指向名为的集合的对象products。为此,我们可以使用以下两行代码:

FirebaseFirestore rootRef = FirebaseFirestore.getInstance();
CollectionReference productsRef = rootRef.collection("products");
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我们还假设我们有一个Cloud Firestore数据库,看起来像这样:

Firestore-root
     |
     --- products
            |
            --- productIdOne
            |      |
            |      --- productName: "Milk"
            |
            --- productIdTwo
                   |
                   --- productName: "Soy Milk"
            |
            --- productIdThree
                   |
                   --- productName: "Bacon"
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为了实现这种结构,让我们使用以下代码将这些产品以及相应的索引添加到数据库中:

Map<String, Object> mapOne = new HashMap<>();
mapOne.put("productName", "Milk");
Map<String, Object> mapTwo = new HashMap<>();
mapTwo.put("productName", "Soy Milk");
Map<String, Object> mapThree = new HashMap<>();
mapThree.put("productName", "Bacon");

WriteBatch writeBatch = rootRef.batch();
writeBatch.set(productsRef.document(), mapOne);
writeBatch.set(productsRef.document(), mapTwo);
writeBatch.set(productsRef.document(), mapThree);
writeBatch.commit();

Client client = new Client(YourApplicationID, YourAPIKey);
Index index = client.getIndex("products");

List<JSONObject> productList = new ArrayList<>();
productList.add(new JSONObject(mapOne));
productList.add(new JSONObject(mapTwo));
productList.add(new JSONObject(mapThree));
index.addObjectsAsync(new JSONArray(productList), null);
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我们还假设我们在out布局文件中有2个视图,分别是an EditText和a ListView

EditText editText = findViewById(R.id.edit_text);
ListView listView = findViewById(R.id.list_view);
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要实际在我们的产品中显示这些产品,请ListView使用以下代码:

productsRef.get()
        .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
            @Override
            public void onComplete(@NonNull Task<QuerySnapshot> task) {
                if (task.isSuccessful()) {
                    List<String> list = new ArrayList<>();
                    for (DocumentSnapshot document : task.getResult()) {
                        list.add(document.getString("productName"));
                    }
                    ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(context, android.R.layout.simple_list_item_1, list);
                    listView.setAdapter(arrayAdapter);
                } else {
                    Log.d(TAG, "Error getting documents: ", task.getException());
                }
            }
        });
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为了根据我们输入的文本过滤产品EditText,我们需要添加TextChangedListener如下内容:

editText.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {}

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {}

    @Override
    public void afterTextChanged(Editable editable) {
        Query query = new Query(editable.toString())
                .setAttributesToRetrieve("productName")
                .setHitsPerPage(50);
        index.searchAsync(query, new CompletionHandler() {
            @Override
            public void requestCompleted(JSONObject content, AlgoliaException error) {
                try {
                    JSONArray hits = content.getJSONArray("hits");
                    List<String> list = new ArrayList<>();
                    for (int i = 0; i < hits.length(); i++) {
                        JSONObject jsonObject = hits.getJSONObject(i);
                        String productName = jsonObject.getString("productName");
                        list.add(productName);
                    }
                    ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(context, android.R.layout.simple_list_item_1, list);
                    listView.setAdapter(arrayAdapter);
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        });
    }
});
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因此,为了使其工作,我们创建了一个新的适配器对象。这意味着,对于我们输入的每个字符EditText,我们都会创建一个新的适配器,并使用来自数据库的结果填充该适配器。为了回答您的问题,为了实现您想要的目标,您不必更改JSONObject,您已经创建了一个新的查询对象,该对象应该传递给setQuery()在该FirestoreRecyclerOptions对象上调用的方法。我只是给了您一个简单的示例来了解流程。有关更多信息,我也建议您观看此视频