Populating ListView from Firebase Database

Question

I have a ListView populated from a Firebase Database:

This is my code:

final DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReferenceFromUrl(".../comunidades");

    FirebaseListAdapter<String> firebaseListAdapter = new FirebaseListAdapter<String>(
            this.getActivity(),
            String.class,
            android.R.layout.simple_list_item_1,
            databaseReference
    ) {
        @Override
        protected void populateView(View v, String model, int position) {
            TextView textView = (TextView) v.findViewById(android.R.id.text1);
            textView.setText(model);
            mProgress.dismiss();

        }
    };

And this is the Firebase console for this database, branch:"comunidades":

But I am using the same code at another fragment to populate a listview with objects from another branch from the same database, but I get an error.

This is the new code:

final DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReferenceFromUrl(".../Enclaves");

    FirebaseListAdapter<String> firebaseListAdapter = new FirebaseListAdapter<String>(
            this.getActivity(),
            String.class,
            android.R.layout.simple_list_item_1,
            databaseReference
    ) {
        @Override
        protected void populateView(View v, String model, int position) {
            TextView textView = (TextView) v.findViewById(android.R.id.text1);
            textView.setText(model);


        }
    };

What should I change to get the value for the key "Nombre_enclave" from branch "Enclaves":

Answer 1

What you have under enclaves is not a list of String+String pairs. Instead it's a list of String+Object pairs, with each object having a Comunidad_enclave, Descripcion_enclave, etc.

The quickest way to make this work is to decide what property you want to show and then override parseSnapshot():

FirebaseListAdapter<String> firebaseListAdapter = new FirebaseListAdapter<String>(
        this.getActivity(),
        String.class,
        android.R.layout.simple_list_item_1,
        databaseReference
) {
    @Override
    protected String parseSnapshot(DataSnapshot snapshot) {
        return snapshot.child("Comunidad_enclave").getValue(String.class);
    }

    @Override
    protected void populateView(View v, String model, int position) {
        TextView textView = (TextView) v.findViewById(android.R.id.text1);
        textView.setText(model);
    }
};

A better way to solve this is to create a class that represents each comunidad. In its simplest form that could look like this:

class Comunidad {
    public String Comunidad_enclave;
    public String Descripcion__enclave;
    // TODO: the same for the other properties
}

With this class, you can make your adapter of type Comunidad:

FirebaseListAdapter<Comunidad> firebaseListAdapter = new FirebaseListAdapter<Comunidad>(
        this.getActivity(),
        String.class,
        android.R.layout.simple_list_item_2,
        databaseReference
) {
    @Override
    protected void populateView(View v, Comunidad model, int position) {
        TextView textView1 = (TextView) v.findViewById(android.R.id.text1);
        textView1.setText(model.Comunidad_enclave);
        TextView textView2 = (TextView) v.findViewById(android.R.id.text2);
        textView2.setText(model.Descripcion_enclave);
    }
};