Question

我正在使用Android应用程序，我想尝试从上一个活动中获取用户输入并将其解析为value字段。这样用户可以获取与搜索查询有关的所有数据。

这是我的实际代码

private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapater;
private RecyclerView.LayoutManager mLayoutManager;

private FirebaseFirestore db;


@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_packages_list);

    final ArrayList<Packages> packagesList = new ArrayList<>();

    mRecyclerView = findViewById(R.id.packsRecycler);
    mRecyclerView.setHasFixedSize(true);
    mLayoutManager = new LinearLayoutManager(this);
    mAdapater = new PackagesAdapter(packagesList);

    mRecyclerView.setLayoutManager(mLayoutManager);
    mRecyclerView.setAdapter(mAdapater);

    Bundle extras = getIntent().getExtras();
    String startL = extras.getString("startLocation"); //I want to parse this userInput to the value at whereEqualTo()//
    String endL = extras.getString("endLocation");// And is it possible to parse this to another field: called searchCityDrop, value://


    db = FirebaseFirestore.getInstance();

        db.collection("PackageDetails").whereEqualTo(field:"searchCityPick", value:startL).get()
                .addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
                    @Override
                    public void onSuccess(QuerySnapshot queryDocumentSnapshots) {

                        if (!queryDocumentSnapshots.isEmpty()){
                            List<DocumentSnapshot> list = queryDocumentSnapshots.getDocuments();

                            for (DocumentSnapshot d : list){

                                Packages p = d.toObject(Packages.class);
                                packagesList.add(p);
                            }

                            mAdapater.notifyDataSetChanged();
                        }
                        else {
                            Toast.makeText(PackagesListActivity.this, "Results not found! According to your destination.", Toast.LENGTH_LONG).show();
                        }
                    }
                }).addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                Toast.makeText(PackagesListActivity.this, "Something went wong. Please try again.", Toast.LENGTH_SHORT).show();
            }
        });

}

如何将用户输入解析为该数据快照值字段？

Answer 1

我不知道解析的含义，但在我看来，您已经从上一个活动中获得了价值。也许尝试getIntent().getStringExtra("startLocation")并在开始此意图之前检查是否确实在意图附加中放了任何东西。

如何将字符串解析为值：“”字段

1 个答案: