Salve, nel logcat mi da il seguente errore
codice:
E/RecyclerView: No adapter attached; skipping layout

dal menu devo aprire la schermata per la ricerca e mi visualizza una pagina bianca


il RecyclerView è il seguente


[code=xml]<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android: orientation="vertical">


<android.support.v7.widget.RecyclerView
android:id="@+id/utentiList"
android:layout_width="match_parent"
android:layout_height="match_parent"
android: paddingTop="10dp"
android:layout_weight="1"
/>
</LinearLayout>[/code]


il file Java della schermata di ricerca è il seguente:
[code=java]public class SearchActivity extends AppCompatActivity {


// CONNECTION_TIMEOUT and READ_TIMEOUT are in milliseconds
public static final int CONNECTION_TIMEOUT = 10000;
public static final int READ_TIMEOUT = 15000;
private RecyclerView mRVUtenti;
private AdapterUtenti mAdapter;


SearchView searchView = null;




@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_searchmain);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {


// adds item to action bar
getMenuInflater().inflate(R.menu.search_main, menu);


// Get Search item from action bar and Get Search service
MenuItem searchItem = menu.findItem(R.id.action_search);
SearchManager searchManager = (SearchManager) SearchActivity.this.getSystemService(Context.SEARC H_SERVICE);
if (searchItem != null) {
searchView = (SearchView) searchItem.getActionView();
}
if (searchView != null) {
searchView.setSearchableInfo(searchManager.getSear chableInfo(SearchActivity.this.getComponentName()) );
searchView.setIconified(false);
}


return true;
}


@Override
public boolean onOptionsItemSelected(MenuItem item) {


return super.onOptionsItemSelected(item);
}


// Every time when you press search button on keypad an Activity is recreated which in turn calls this function
@Override
protected void onNewIntent(Intent intent) {
// Get search query and create object of class AsyncFetch
if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
String query = intent.getStringExtra(SearchManager.QUERY);
if (searchView != null) {
searchView.clearFocus();
}
new AsyncFetch(query).execute();


}
}


// Create class AsyncFetch
private class AsyncFetch extends AsyncTask<String, String, String> {


ProgressDialog pdLoading = new ProgressDialog(SearchActivity.this);
HttpURLConnection conn;
URL url = null;
String searchQuery;


public AsyncFetch(String searchQuery){
this.searchQuery=searchQuery;
}


@Override
protected void onPreExecute() {
super.onPreExecute();


//this method will be running on UI thread
pdLoading.setMessage("\tLoading...");
pdLoading.setCancelable(false);
pdLoading.show();


}


@Override
protected String doInBackground(String... params) {
try {


// Enter URL address where your php file resides
url = new URL("http://www.sito.com/utenti_search.php");


} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return e.toString();
}
try {


// Setup HttpURLConnection class to send and receive data from php and mysql
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(READ_TIMEOUT);
conn.setConnectTimeout(CONNECTION_TIMEOUT);
conn.setRequestMethod("POST");


// setDoInput and setDoOutput to true as we send and recieve data
conn.setDoInput(true);
conn.setDoOutput(true);


// add parameter to our above url
Uri.Builder builder = new Uri.Builder().appendQueryParameter("searchQuery", searchQuery);
String query = builder.build().getEncodedQuery();


OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
writer.write(query);
writer.flush();
writer.close();
os.close();
conn.connect();


} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return e1.toString();
}


try {


int response_code = conn.getResponseCode();


// Check if successful connection made
if (response_code == HttpURLConnection.HTTP_OK) {


// Read data sent from server
InputStream input = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
StringBuilder result = new StringBuilder();
String line;


while ((line = reader.readLine()) != null) {
result.append(line);
}


// Pass data to onPostExecute method
return (result.toString());


} else {
return("Connection error");
}


} catch (IOException e) {
e.printStackTrace();
return e.toString();
} finally {
conn.disconnect();
}




}


@Override
protected void onPostExecute(String result) {


//this method will be running on UI thread
pdLoading.dismiss();
List<DataUtenti> data=new ArrayList<>();


pdLoading.dismiss();
if(result.equals("no rows")) {
Toast.makeText(SearchActivity.this, "No Results found for entered query", Toast.LENGTH_LONG).show();
}else{


try {


JSONArray jArray = new JSONArray(result);


// Extract data from json and store into ArrayList as class objects
for (int i = 0; i < jArray.length(); i++) {
JSONObject json_data = jArray.getJSONObject(i);
DataUtenti utentiData = new DataUtenti();
utentiData.Cognome = json_data.getString("cognome");
utentiData.Nome = json_data.getString("nome");
utentiData.Paese = json_data.getString("paese");
utentiData.Zodiacale = json_data.getString("zodiacale");
data.add(utentiData);
}


// Setup and Handover data to recyclerview
mRVUtenti = (RecyclerView) findViewById(R.id.utentiList);
mAdapter = new AdapterUtenti(SearchActivity.this, data);
mRVUtenti.setAdapter(mAdapter);
mRVUtenti.setLayoutManager(new LinearLayoutManager(SearchActivity.this));


} catch (JSONException e) {
// You to understand what actually error is and handle it appropriately
Toast.makeText(SearchActivity.this, e.toString(), Toast.LENGTH_LONG).show();
Toast.makeText(SearchActivity.this, result.toString(), Toast.LENGTH_LONG).show();
}


}


}


}
}[/code]


come posso risolverlo?


Grazie