如何从firestore获取字段并更新textview？

Question

I am trying to get a value from Firestore but I am getting null every time. Can someone tell me what wrong I am doing? This is my Firestore collections and documents.

DocumentReference docRef =  dbase.collection("newsImage").document("cqmpNF45IZsHDSx9hSuq");
colref.get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
    @Override
    public void onComplete(@NonNull @NotNull Task<DocumentSnapshot> task) {
        if (task.isSuccessful()) {
            DocumentSnapshot document = task.getResult();
            if (document.exists()) {
                str = document.getString("imgNews");
                tv.setText(str);
            } else
                Log.d("docv", "No such document");
        } else
            Log.d("docv", "get failed with ", task.getException());
    }
});

Answer 1

Most likely the problem comes from the following lines of code:

String newsText= ipustr;
tv.setText(sectorText);

Where you try to assign a value that doesn't come from the database. So most probably you should do something like this:

str = document.getString("imgNews");
tv.setText(str);

Or even simples:

tv.setText(document.getString("imgNews"));

Edit:

The name of the filed is incorrect, so please use:

tv.setText(document.getString("imgnews"));