使用微调器填充RecyclerView

Question

I am loading a list from Firebase's Firestore DB to populate a spinner. That works. I want to populate a RecyclerView upon ItemSelected in the spinner.

I have this code to populate RecyclerView:

private void populateRecycler(final String RootCollection, final String UserID) {
    final String UserID = getIntent().getExtras().getString(UserIDKey);
    mQuery = mFirestore
            .collection(RootCollection)
            .whereEqualTo("UID", UserID)
            .orderBy("DateAdded", Query.Direction.DESCENDING);

    mAdapter = new OrdersAdapter(mQuery, HomeActivity.this);

    mOrdersRecycler.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
    mOrdersRecycler.setAdapter(mAdapter);
}

This code works fine if it's placed or called from onCreate. But I want to modify the code later to populate base on String in the spinner later. (probably just to add another .whereEqualto)

When I call populateRecycler() from here, it doesn't work (I'm using ButterKnife, fyi):

@OnItemSelected(R.id.storespinner)
public void spinnerItemSelected(Spinner spinner, int position) {
    String spinnerValue = mStoreSpinner.getItemAtPosition(position).toString();
    Toast.makeText(getBaseContext(), "Selected item " + spinnerValue, Toast.LENGTH_SHORT).show();
populateRecycler("test", UserID);
}

Or if I call populateRecycler from another onSuccess listener (Firebase Firestore DB call), it also does not work:

    public void onSuccess(DocumentSnapshot documentSnapshot) {
                    UIDOrg uidOrg = documentSnapshot.toObject(UIDOrg.class);
                    mOrgTextView.setText(uidOrg.getOrg()); 
                    RootCollection = uidOrg.getRootCollection();
                    populateRecycler("test", UserID);

Can someone please point me in the right direction ?

Why does populateRecycler only work when called from onCreate?

Edit: This is how I fill the spinner array.

                public void onSuccess(DocumentSnapshot documentSnapshot) {
                    UIDOrg uidOrg = documentSnapshot.toObject(UIDOrg.class);
                    mOrgTextView.setText(uidOrg.getOrg());
                    RootCollection = uidOrg.getRootCollection();

                    //Populate Spinner here
                    readData(new FirestoreCallBack() {
                        @Override
                        public void onCallback(List<String> list) {
                            ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_spinner_item, list);
                            adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                            mStoreSpinner.setAdapter(adapter);
                        }
                    });
                    //End of Spinner
                }

And in readData() it's:

                public void onComplete(@NonNull Task<QuerySnapshot> task) {
                    if (task.isSuccessful()) {
                        for (DocumentSnapshot document : task.getResult()) {
                           spinnerArray.add(String.valueOf(document.getId()));
                        }
                        firestoreCallBack.onCallback(spinnerArray);
                    } else {
                        Log.d(TAG, "Error getting documents: ", task.getException());
                    }
                }

Answer 1

firstly check with this method, your onItemSelected working properly on not:

   spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
         @Override
         public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
             Toast.makeText(MainActivity.this, "test"+ position, Toast.LENGTH_SHORT).show();

         }

         @Override
         public void onNothingSelected(AdapterView<?> parent) {

         }
     });

if it is working fine then issue may be in your declaration with ButterKnife . See my example its working properly. firstly declare spinner in Activity like this:

  @InjectView(R.id.spinner)
    Spinner spinner;

then in oncreate method:

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.inject(this);

        ArrayList<String> list = new ArrayList<>();
        list.add("test");
        list.add("test1");
        list.add("test2");
        list.add("test3");
        list.add("test4");
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item,list);
        spinner.setAdapter(adapter);

    }

then outside this method i declare OnItemSelected in activity

   @OnItemSelected(R.id.spinner)
    public void spinnerItemSelected(Spinner spinner, int position) {
        Toast.makeText(this, "test", Toast.LENGTH_SHORT).show();
    }

try this and check what going wrong with your code.

Answer 2

if you call populateRecycler method on spinner value selection time that used below code i not provide the code in butter kinfe library but provide simple java code and you will convert into butter kinfe code ...

spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
            String spinnerValue = spinner.getSelectedItem().toString();
            Toast.makeText(getBaseContext(), "Selected item " + spinnerValue, Toast.LENGTH_SHORT).show();
            populateRecycler("test", UserID);        
        }

        @Override
        public void onNothingSelected(AdapterView<?> adapterView) {

        }
    });

Answer 3

I've solved it. I guess after-all it's really a Firestore solution.

I really just needed this line when populateRecycler is called from elsewhere other than onCreate.

   mAdapter.setQuery(query);

Firestore is already updating the Recycler dynamically, all I needed to do was to update a new query and then .setQuery(query) so that the Recycler view is updated.