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Firebase RecyclerView no carga datos nuevos (1)

A tus métodos de establecimiento de sondeos les falta this :

public void setQuestion(String question) { this.question = question; } public void setImage_URL(String image_URL) { this.image_URL = image_URL; }

Y reemplace este código:

Map <String, Object> pollMap = poll.toMap(); String key = mBaseRef.child("Polls").push().getKey(); Map<String, Object> childUpdates = new HashMap<String, Object>(); childUpdates.put("/Polls/" + key, pollMap); mBaseRef.updateChildren(childUpdates);

con:

mBaseRef.child("Polls").push().setValue(poll, new DatabaseReference.CompletionListener() { @Override public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) { if (databaseError == null) { Log.i("Poll", "onComplete: SUCCESS"); } else { Log.w("Poll", "onComplete: ", databaseError.toException()); } } });

También mueva el código que crea mFireAdapter y lo establece en mRecyclerview desde onStart() hasta el final de onCreateView() :

//... mRecyclerview.setLayoutManager(mLayoutManager); mFireAdapter = ...; mRecyclerview.setAdapter(mFireAdapter); return v;

La documentación proporciona un ejemplo .

Intento crear un RecyclerView en tiempo real cada vez que un usuario agrega un elemento a una determinada referencia de base de datos en Firebase. Aquí está mi clase de modelo:

@IgnoreExtraProperties public class Poll { private String question; private String image_URL; public Poll() { } public Poll(String Question, String Image_URL){ this.question = Question; this.image_URL = Image_URL; } public String getQuestion() { return question; } public void setQuestion(String question) { question = question; } public String getImage_URL() { return image_URL; } public void setImage_URL(String image_URL) { image_URL = image_URL; } @Exclude public Map<String, Object> toMap(){ HashMap<String, Object> result = new HashMap<>(); result.put("question", question); result.put("image_URL", image_URL); return result; }

Aquí está la clase donde guardo los datos en Firebase. En realidad, se está escribiendo en Firebase, por lo que puedo confirmar que lo estoy escribiendo correctamente:

mSubmitPollCreation.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //TODO: Need to check if poll requirements are added, i.e. Question, Answer, ...... //check if image has been loaded first if (resultImageURL == null){ Toast.makeText(getApplicationContext(),getResources().getString(R.string.no_image_selected),Toast.LENGTH_LONG).show(); return; } Poll poll = new Poll(mCreatePollQuestion.getText().toString(), resultImageURL); Map <String, Object> pollMap = poll.toMap(); String key = mBaseRef.child("Polls").push().getKey(); Map<String, Object> childUpdates = new HashMap<String, Object>(); childUpdates.put("/Polls/" + key, pollMap); mBaseRef.updateChildren(childUpdates); Intent toHomeActivity = new Intent(CreateActivity.this, HomeActivity.class); toHomeActivity.putExtra("viewpager_position", 2); startActivity(toHomeActivity); } });

Quiero que la vista de reciclador se actualice en vivo en todos los dispositivos a medida que se agrega un artículo. Aquí está el fragmento que utilizo para llenar el RecyclerView usando la biblioteca UI de Firebase. A medida que agrego datos / escritura a Firebase como figura en el fragmento de código anterior, no veo actualizaciones en vivo en ningún dispositivo:

public class LiveFragment extends Fragment { // TODO: Rename parameter arguments, choose names that match // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER private static final String ARG_PARAM1 = "param1"; private static final String ARG_PARAM2 = "param2"; private RecyclerView mRecyclerview; private DatabaseReference mBaseRef; private DatabaseReference mPollsRef; private LinearLayoutManager mLayoutManager; private FirebaseRecyclerAdapter <Poll, PollHolder> mFireAdapter; // TODO: Rename and change types of parameters private String mParam1; private String mParam2; private OnFragmentInteractionListener mListener; public LiveFragment() { // Required empty public constructor } /** * Use this factory method to create a new instance of * this fragment using the provided parameters. * * @param param1 Parameter 1. * @param param2 Parameter 2. * @return A new instance of fragment LiveFragment. */ // TODO: Rename and change types and number of parameters public static LiveFragment newInstance(String param1, String param2) { LiveFragment fragment = new LiveFragment(); Bundle args = new Bundle(); args.putString(ARG_PARAM1, param1); args.putString(ARG_PARAM2, param2); fragment.setArguments(args); return fragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getArguments() != null) { mParam1 = getArguments().getString(ARG_PARAM1); mParam2 = getArguments().getString(ARG_PARAM2); } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment final View v = inflater.inflate(R.layout.fragment_new, container, false); mRecyclerview = (RecyclerView) v.findViewById(R.id.new_RecyclerView); mBaseRef = FirebaseDatabase.getInstance().getReference(); mPollsRef = mBaseRef.child("Polls"); if (mRecyclerview != null){ mRecyclerview.setHasFixedSize(true); } mLayoutManager = new LinearLayoutManager(getActivity().getApplicationContext()); mLayoutManager.setOrientation(LinearLayoutManager.VERTICAL ); mRecyclerview.setLayoutManager(mLayoutManager); return v; } // TODO: Rename method, update argument and hook method into UI event public void onButtonPressed(Uri uri) { if (mListener != null) { mListener.onFragmentInteraction(uri); } } @Override public void onStart() { super.onStart(); mFireAdapter = new FirebaseRecyclerAdapter<Poll, PollHolder>( Poll.class, R.layout.latest_item, PollHolder.class, mPollsRef ){ @Override protected void populateViewHolder(PollHolder viewHolder, Poll model, int position) { viewHolder.mPollQuestion.setText(model.getQuestion()); Picasso.with(getActivity().getApplicationContext()) .load(model.getImage_URL()) .fit() .into(viewHolder.mPollImage); Log.v("QUESTION", model.getQuestion()); Log.v("IMAGE", model.getImage_URL()); } }; mRecyclerview.setAdapter(mFireAdapter); } @Override public void onStop() { super.onStop(); if (mFireAdapter != null){ mFireAdapter.cleanup(); } } @Override public void onAttach(Context context) { super.onAttach(context); if (context instanceof OnFragmentInteractionListener) { mListener = (OnFragmentInteractionListener) context; } else { throw new RuntimeException(context.toString() + " must implement OnFragmentInteractionListener"); } } @Override public void onDetach() { super.onDetach(); mListener = null; } public static class PollHolder extends RecyclerView.ViewHolder { TextView mPollQuestion; ImageView mPollImage; public PollHolder(View itemView) { super(itemView); mPollQuestion = (TextView) itemView.findViewById(R.id.latest_item_question); mPollImage = (ImageView) itemView.findViewById(R.id.pollThumbNailImage); } } /** * This interface must be implemented by activities that contain this * fragment to allow an interaction in this fragment to be communicated * to the activity and potentially other fragments contained in that * activity. * <p> * See the Android Training lesson <a href= * "http://developer.android.com/training/basics/fragments/communicating.html" * >Communicating with Other Fragments</a> for more information. */ public interface OnFragmentInteractionListener { // TODO: Update argument type and name void onFragmentInteraction(Uri uri); } }

EDITAR: creo que los datos que se escriben en Firebase son nulos por alguna razón, ya que los registros de la Question y ImageURL no devuelven ningún dato.