I doing a ArrayList with a Class "Company", this list a companys what get for firestore.

The code for class is:

public ArrayList<String> companyList (View view) {

        CompanyList.add(0, "Seleccione un proveedor");
    
        FirebaseUser currentFirebaseUser = FirebaseAuth.getInstance().getCurrentUser() ;
    
        FirebaseFirestore db = FirebaseFirestore.getInstance();
    
        db.collection("users").document(currentFirebaseUser.getUid()).get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
            @Override
            public void onSuccess(DocumentSnapshot documentSnapshot) {
    
                User = (HashMap<String, Object>) documentSnapshot.getData();
    
                if(User.get("List") != "") {
                    List = (HashMap<String, Object>) User.get("List");
                    CompanyList.addAll(List.keySet());
                    Log.i("Current User: ", CompanyList.toString());
                }
            }
        });
    
        return CompanyList;
    }`

This class work fine, i used on spinners but when i use for charge a ArrayList on fragment don't work. The code for fragment is:

Company company = new Company();
ArrayList<String> arrayList = new ArrayList<>(company.companyList(root));
Log.i("Current User: ", arrayList.toString());

When executed code the log show this:

2022-04-02 13:34:12.370 17434-17434/com.martin.preventapp I/Current User:: [Seleccione un proveedor] 2022-04-02 13:34:12.615 17434-17434/com.martin.preventapp I/Current User:: [Seleccione un proveedor, Nutrifresca, Ideas Gastronomicas, Pollo]

The first log show a arrayList from fragment and second log show the class arrayList.

I can't charge the arrayList at fragment as a class show, what's wrong??

I try this methods for charge a ArrayList:

1. ArrayList<String> arrayList = new ArrayList<>(company.companyList(root)

2. ArrayList<String> arrayList = new ArrayList<>(); arrayList.addAll(company.companyList(root));

3. ArrayList<String> arrayList; arrayList = (ArrayList<String>) company.companyList();

CodePudding user response：

I could suggest that you start by declaring a variable as an ArrayList such as :

ArrayList<String> resultArraylist = new ArrayList<>();

And then you add your first item :`

resultArrayList.add("Seleccionne un providor");

With ArrayList except if you always want to add in first position, the method add will put your item at the end of the list.

CodePudding user response：

Louis Wasserman, Cheshiremoe, Thomas Koenig, thanks for reply.

Thomas, i tried with this method but no result.

Louis and Cheshiremoe, i try implemented a AsyncTask. On doInBackground put the code what get arraylist from firestore, in onPostExecute i try compare a arrayList. The code is this:

private class Task extends AsyncTask<String, String, ArrayList<String>> {

    // Runs in UI before background thread is called
    @Override
    protected void onPreExecute() {
        super.onPreExecute();

        // Do something like display a progress bar
    }

    // This is run in a background thread
    @Override
    protected ArrayList<String> doInBackground(String... params) {

        Company company = new Company();

            // Call this to update your progress
            //publishProgress(companyList);

        return company.companyList(getView());
    }

    // This is called from background thread but runs in UI
    protected void onProgressUpdate(ArrayList<String> arr1) {

    }

    // This runs in UI when background thread finishes
    @Override
    protected void onPostExecute(ArrayList<String> result) {
        super.onPostExecute(result);
        ArrayList<String> companyList = new ArrayList<String>(result);
        TextView tvt = getView().findViewById(R.id.textView7);

        if(companyList.size() > 1){
            addFragmentListAdd();
            tvt.setText(companyList.toString());
        }
        Log.i("Current User TASK: ", companyList.toString());
    }
}

and the call is:

new Task().execute();

but this don't work as expected, the log is:

I/Current User TASK:: [Seleccione un proveedor]

Is the first time i implement AsyncTask, is this way correct??