notifyDataSetChanged on RecyclerView - json

Question

I have a recyclerView and customAdaprer. I pass an list of an object (earthquakeList)to recycleradapter and then i do setAdapter:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
earthquakeList = new ArrayList<>();
adapter = new RecyclerViewAdapter(earthquakeList);
recyclerView.setAdapter(adapter);
}
I create AsyncTask on onResume method:
#Override
protected void onResume() {
super.onResume();
// Kick off an {#link AsyncTask} to perform the network request
new EarthQuakeAsyncTask().execute();
}
in AsyncTask my class i get a new List from my object that i get from internet and when I replaced this new list with older list and call notifyDataSetChanged, recyclerView still nothing show??
I debug my app and I get object from net.
I do in this way on list view but recylerview seems efferent.
I replace old list with the new list one like blow:
private class EarthQuakeAsyncTask extends AsyncTask<Void, Void, List<Earthquake>> {
#Override
protected List<Earthquake> doInBackground(Void... urls) {
// Create URL object
URL url = HttpRequest.createUrl(USGS_REQUEST_URL);
// perform HTTP request to the URL and receive a JSON response back
String jsonResponse = "";
try {
jsonResponse = HttpRequest.makeHttpRequest(url);
} catch (IOException e) {
e.printStackTrace();
}
List<Earthquake> earthquakes = HttpRequest.extractFeaturesFromJson(jsonResponse);
return earthquakes;
}
#Override
protected void onPostExecute(List<Earthquake> earthquakeList) {
super.onPostExecute(earthquakeList);
MainActivity.this.earthquakeList.clear();
MainActivity.this.earthquakeList.addAll(earthquakeList);
adapter.notifyDataSetChanged();
}
what is exactly my wrong?
************************ EDIT ********************
this is Adapter :
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.MyHolder> {
List<Earthquake> earthquakes;
public RecyclerViewAdapter(List<Earthquake> earthquakes) {
this.earthquakes = earthquakes;
}
#Override
public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(
R.layout.earthquak_list_item, parent, false);
MyHolder myHolder = new MyHolder(view);
return myHolder;
}
#Override
public void onBindViewHolder(MyHolder holder, int position) {
Earthquake earthquake = earthquakes.get(position);
holder.magnitude.setText(earthquake.getmMagnitude());
holder.location.setText(earthquake.getmLocation());
holder.time.setText(earthquake.getmDate());
}
#Override
public int getItemCount() {
return (null != earthquakes ? earthquakes.size() : 0);
}
public void setItems(List<Earthquake> earthquakeList) {
this.earthquakes = earthquakeList;
}
public class MyHolder extends RecyclerView.ViewHolder {
#BindView(R.id.magnitude)
TextView magnitude;
#BindView(R.id.location)
TextView location;
#BindView(R.id.date)
TextView time;
public MyHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}

Answer 1

Ops ,I forgot put LayoutManager for recyclerView .
this is right code:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
earthquakeList = new ArrayList<>();
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
adapter = new RecyclerViewAdapter(earthquakeList);
recyclerView.setAdapter(adapter);
}