Develop Reference

create recycler view in fragment?

i want create a fragment and have inside a recycler view for show products ...
but when i render it is show this error : RecyclerView: No adapter attached; skipping layout
below i copy my codes;
this code is for adapter class :
private ArrayList<Products> ProductsList;
private Context context;
public Adapter(ArrayList<Products> productsList, Context context) {
ProductsList = productsList;
this.context = context;
}
#Override
public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(context).inflate(R.layout.row_layout, parent, false);
return new MyHolder(v);
}
#Override
public void onBindViewHolder(MyHolder holder, final int position) {
Products products = ProductsList.get(position);
holder.txtName.setText(products.getName());
holder.txtPrice.setText("$ " + products.getPrice());
Picasso.get().load(Config.ipValue + "/images/" + products.getPhoto()).into(holder.imgV);
holder.imgV.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
v.startAnimation(AnimationUtils.loadAnimation(context, android
.R.anim.slide_in_left));
}
});
}
#Override
public int getItemCount() {
return ProductsList.size();
}
class MyHolder extends RecyclerView.ViewHolder {
TextView txtName;
TextView txtPrice;
ImageView imgV;
public MyHolder(View itemView) {
super(itemView);
txtName = itemView.findViewById(R.id.rowTxtProductName);
txtPrice = itemView.findViewById(R.id.rowTxtPrice);
imgV = itemView.findViewById(R.id.rowImgProduct);
}
}
and this one for web api class :
public class WebApiHandler {
Context context;
String apiLink = "";
ArrayList<Products> products = new ArrayList<>();
public WebApiHandler(Context context) {
this.context = context;
}
void apiConnect(String type) {
switch (type) {
case "getproducts": {
apiLink = Config.getProductsWebApi;
break;
}
}
ProgressDialog dialog = ProgressDialog.show(context, "Connecting...",
"please wait", false, false);
StringRequest request = new StringRequest(Request.Method.POST,
apiLink, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
dialog.dismiss();
showJson(response);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
dialog.dismiss();
}
});
RequestQueue queue = Volley.newRequestQueue(context);
queue.add(request);
}
private void showJson(String response) {
products.clear();
try {
JSONObject jsonObject = new JSONObject(response);
JSONArray jsonArray = jsonObject.getJSONArray("response");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject object = jsonArray.getJSONObject(i);
String id = object.getString("id");
String name = object.getString("name");
String description = object.getString("description");
String price = object.getString("price");
String photo = object.getString("photo");
Products p = new Products(id, name, description, price, photo);
products.add(p);
}
} catch (JSONException e) {
e.printStackTrace();
}
VerticalFragment.productsArrayList = products;
IData iData = (IData) context;
iData.sendData();
}}
and my fragment code :
public class VerticalFragment extends Fragment implements IData {
RecyclerView rcVertical;
WebApiHandler webApiHandler;
static ArrayList<Products> productsArrayList = new ArrayList<>();
public VerticalFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_vertical, container, false);
rcVertical = view.findViewById(R.id.rcVertical);
webApiHandler = new WebApiHandler(getContext());
webApiHandler.apiConnect("getproducts");
rcVertical.addOnItemTouchListener(new RecyclerTouchListener(getContext(), rcVertical,
new RecyclerTouchListener.ClickListener() {
#Override
public void onClick(View view, int position) {
ProductActivity.products = productsArrayList.get(position);
startActivity(new Intent(getContext(), ProductActivity.class));
}
#Override
public void onLongClick(View view, int position) {
}
}));
return view;
}
#Override
public void sendData() {
Adapter adapter = new Adapter(productsArrayList, getContext());
rcVertical.setLayoutManager(new LinearLayoutManager((getContext())));
rcVertical.setItemAnimator(new DefaultItemAnimator());
rcVertical.setAdapter(adapter);
}}
i should say i create a interface and have one method i say it sendData

This is a common error when there is no adapter attached to recyclerview upon showing recyclerview. It will not cause any harm to your app, but you could avoid it by setting empty adapter without data, and later when you get your data, provide it to your adapter and notify it
Edit - Example added
Create setter for your list in adapter. After that, in your fragment make adapter global and in onCreateView make instance of your adapter and attach it to recyclerview
adapter = new Adapter(new ArrayList<>(), getContext());
rcVertical.setAdapter(adapter);
...Initialize recyclerview...
And then in your sendData interface put your loaded values in it
adapter.setData(productsArrayList);
adapter.notifyDataSetChanged();

Can't add data from json in ArrayList

I'm trying to display data from JSON in listView, but whenever I'll try to add some value from json, my list shows me nothing.
Activity
public static final String LOG = hourlyWeather.class.getSimpleName();
double test;
RequestQueue mQuene;
ArrayList<Weather> list;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_hourly_weather);
mQuene = Volley.newRequestQueue(this);
list = new ArrayList<Weather>();
test();
hourlyWeatherAdapter adapter = new hourlyWeatherAdapter(this, list);
ListView listView = (ListView) findViewById(R.id.weatherListView);
listView.setAdapter(adapter);
}
public void test() {
String url = "https://api.openweathermap.org/data/2.5/weather?lat=50.7578594&lon=16.2127653&units=metric&appid=ID";
JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
response -> {
try {
JSONObject object = response.getJSONObject("main");
for (int i = 0; i<object.length(); i++){
test = object.getDouble("temp");
}
Log.i(LOG,String.valueOf(test));
list.add(new Weather(test));
} catch (JSONException e) {
e.printStackTrace();
}
}, Throwable::printStackTrace);
mQuene.add(request);
}
}
Adapter
public class hourlyWeatherAdapter extends ArrayAdapter<Weather> {
public hourlyWeatherAdapter(#NonNull Context context, ArrayList<Weather> list) {
super(context, 0, list);
}
#NonNull
#Override
public View getView(int position, #Nullable View convertView, #NonNull ViewGroup parent) {
View view = convertView;
if (view == null) {
view = LayoutInflater.from(getContext()).inflate(R.layout.weather_list_item, parent, false);
}
Weather model = getItem(position);
TextView temperature = (TextView) view.findViewById(R.id.hourly_time);
temperature.append(String.valueOf(model.getTemp()));
return view;
}
}
public class Weather {
private double temp;
public Weather(double temp) {
this.temp = temp;
}
public double getTemp() {
return temp;
}
}
When I'll using the Log.i, I can clearly see value from json in my logcat. Where can be issue? I've tried to add some dummy data, and it works out just fine.

You must declare hourlyWeatherAdapter adapter = new hourlyWeatherAdapter(this, list); outside your onCreate() method, and after change your array, you must call notifyDataSetChanged();. Also, you must initialize your list and adapter before call test().
public static final String LOG = hourlyWeather.class.getSimpleName();
double test;
RequestQueue mQuene;
ArrayList<Weather> list;
hourlyWeatherAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_hourly_weather);
mQuene = Volley.newRequestQueue(this);
list = new ArrayList<Weather>();
adapter = new hourlyWeatherAdapter(this, list);
ListView listView = (ListView) findViewById(R.id.weatherListView);
listView.setAdapter(adapter);
test();
}
public void test() {
String url = "https://api.openweathermap.org/data/2.5/weather?lat=50.7578594&lon=16.2127653&units=metric&appid=ID";
JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
response -> {
try {
JSONObject object = response.getJSONObject("main");
for (int i = 0; i<object.length(); i++){
test = object.getDouble("temp");
}
Log.i(LOG,String.valueOf(test));
list.add(new Weather(test));
// Update list
adapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}, Throwable::printStackTrace);
mQuene.add(request);
}
}

RecyclerView Loading Data Delay for Passing Json Data On ArrayList to New Activity

I am using Button to pass JSON data with ArrayList to another Activity on RecyclerView But When I run My App at first RecyclerView display empty lists and after presssing back button and clicking that button again RecyclerView show my list I don't know What's Wrong with my code Please Help me
mainList = gson.fromJson(getIntent().getStringExtra("key"), new TypeToken<List<MyData>>(){}.getType());
if (mainList != null) {
setrecyclerview(mainList);
} else {
pr.show();
}
I'll try to use this but Don't Work:(
MainActivity
public class MainActivity extends AppCompatActivity {
private List<MyData> data_list;
private RequestQueue requestQueue;
String get_info_url = "http://192.168.170.2/iVolleyPractice/user_info_check.php";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//recyclerView = (RecyclerView) findViewById(R.id.data_recycler);
data_list = new ArrayList<>();
//load_from_data();
}
public void GoOnClick(View view) {
load_from_data();
Gson gson = new Gson();
String json = new Gson().toJson(data_list);
Intent intent = new Intent(MainActivity.this, Main2Activity.class);
intent.putExtra("key", json);
startActivity(intent);
}
private void load_from_data() {
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, get_info_url, null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray jsonArray = response.getJSONArray("users");
for (int i = 0 ; i < jsonArray.length() ; i++)
{
JSONObject users = jsonArray.getJSONObject(i);
MyData myData = new MyData();
myData.setName(users.getString("name"));
myData.setPassword(users.getString("password"));
data_list.add(myData);
}
} catch (Exception e) {}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
//setrecyclerview(data_list);
requestQueue = Volley.newRequestQueue(MainActivity.this);
requestQueue.add(jsonObjectRequest);
}
MAinActivity 2
public class Main2Activity extends AppCompatActivity {
public RecyclerView recyclerView;
public List<MyData> mainList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
recyclerView = (RecyclerView) findViewById(R.id.go_recycle);
Gson gson = new Gson();
ProgressDialog pr = new ProgressDialog(this);
this.getIntent().getExtras().getParcelableArrayList("key");
ProgressDialog pr = new ProgressDialog(this);
this.getIntent().getExtras().getParcelableArrayList("key");
mainList = gson.fromJson(getIntent().getStringExtra("key"), new TypeToken<List<MyData>>(){}.getType());
setrecyclerview(mainList);
}
private boolean setrecyclerview(List<MyData> data_list) {
CustomAdapter adapter = new CustomAdapter(this, data_list);
DividerItemDecoration divider = new DividerItemDecoration(recyclerView.getContext(), new LinearLayoutManager(this).getOrientation());
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.addItemDecoration(divider);
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(adapter);
return true;
}
}
Adapter
class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.ViewHolder> {
private Context context;
private List<MyData> myData;
public CustomAdapter(Context context, List<MyData> myData) {
this.context = context;
this.myData = myData;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int i) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_inflater, parent, false);
return new ViewHolder(itemView);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.name.setText(myData.get(position).getName());
holder.pass.setText(myData.get(position).getPassword());
}
#Override
public int getItemCount() {
return myData.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView name,pass;
public ViewHolder(View itemView) {
super(itemView);
name = (TextView) itemView.findViewById(R.id.name_txt);
pass = (TextView) itemView.findViewById(R.id.pass_txt);
}
}
MyData
public class MyData implements Parcelable {
private String name,password;
public MyData() {
this.name = name;
this.password = password;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
protected MyData(Parcel in) {
name = in.readString();
password = in.readString();
}
public static final Creator<MyData> CREATOR = new Creator<MyData>() {
#Override
public MyData createFromParcel(Parcel in) {
return new MyData(in);
}
#Override
public MyData[] newArray(int size) {
return new MyData[size];
}
};
#Override
public int describeContents() {
return 0;
}
#Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(name);
dest.writeString(password);
}
I wan when Click my button in MainActivity Display MyData In RecyclerView In MainActivity2 but For First run of my App Showing empty Recycler but when use back press button and click pass data button again display data

In your MainActivity2, at first time when you call setrecyclerview() mainList is empty.
change your mainActivity2 code as below:
public RecyclerView recyclerView;
public List<MyData> mainList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
recyclerView = (RecyclerView) findViewById(R.id.go_recycle);
Gson gson = new Gson();
ProgressDialog pr = new ProgressDialog(this);
this.getIntent().getExtras().getParcelableArrayList("key");
mainList = gson.fromJson(getIntent().getStringExtra("key"), new TypeToken<List<MyData>>(){}.getType());
if (!setrecyclerview(mainList) ) {
//I don't know why you are doing this.because setrecyclerview() always returns true
pr.show();
} else {
setrecyclerview(mainList);
}
}
private boolean setrecyclerview(List<MyData> data_list) {
CustomAdapter adapter = new CustomAdapter(this, data_list);
DividerItemDecoration divider = new DividerItemDecoration(recyclerView.getContext(), new LinearLayoutManager(this).getOrientation());
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.addItemDecoration(divider);
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(adapter);
return true;
}

Replace this...
if (!setrecyclerview(mainList) ) {
pr.show();
} else {
mainList = gson.fromJson(getIntent().getStringExtra("key"), new TypeToken<List<MyData>>(){}.getType());
setrecyclerview(mainList);
}
with...
mainList = gson.fromJson(getIntent().getStringExtra("key"), new TypeToken<List<MyData>>(){}.getType());
setrecyclerview(mainList);

RecyclerView not showing data

I am new to android, developing an android application but I stuck here. RecyclerView shows empty. There are no errors or crashes in the log. I deleted and created new but same issue. I cant find what's wrong.
java code for main activity
public class HomeActivity extends AppCompatActivity {
private RecyclerView rcview1;
private RecyclerView.Adapter cmpadapter1;
private List<commdtylist> listitems2;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
rcview1 = (RecyclerView) findViewById(R.id.commoditylist);
rcview1.setItemAnimator(new DefaultItemAnimator());
listitems2 = new ArrayList<>();
rcview1.setHasFixedSize(true);
viewcmp();
}
public void viewcmp() {
StringRequest stringRequest=new StringRequest(Request.Method.POST, otpur, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jobj = new JSONObject(response);
JSONArray jsonArray = jobj.getJSONArray("Details");
for (int i = 0; i < jsonArray.length(); i++) {
jobj = jsonArray.getJSONObject(i);
commdtylist item = new commdtylist(
jobj.getString("quantity_entitle"),
jobj.getString("comm_code"),
jobj.getString("item_description")
);
listitems2.add(item);
}
cmpadapter1 = new CommdityviewAdapter(listitems2, getApplicationContext());
rcview1.setAdapter(cmpadapter1);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
}){
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> param = new HashMap<>();
param.put("rc_no", crd);
return param;
}
};
RequestQueue requestQueue= Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
commdtylist
public class commdtylist {
private String quantity_entitle;
private String comm_code;
private String item_description;
public commdtylist(String quantity_entitle, String comm_code, String item_description) {
this.quantity_entitle = quantity_entitle;
this.comm_code = comm_code;
this.item_description = item_description;
}
public String getquantity_entitle() {
return quantity_entitle;
}
public String getcomm_code() {
return comm_code;
}
public String getitem_description() {
return item_description;
}
}
Adapter
public class CommdityviewAdapter extends RecyclerView.Adapter<CommdityviewAdapter.RViewHolder> {
private List<commdtylist> listitems2;
private Context context;
int lastPosition = -1;
public CommdityviewAdapter(List<commdtylist> listitems2, Context context) {
this.listitems2 = listitems2;
this.context = context;
}
public static Toast t = null;
#Override
public RViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v= LayoutInflater.from(parent.getContext()).inflate(R.layout.view_cmdstyle,parent,false);
return new RViewHolder(v);
}
#Override
public void onBindViewHolder(final RViewHolder holder,final int position) {
final commdtylist listitem=listitems2.get(position);
holder.quantity_entitle.setText(listitem.getquantity_entitle());
holder.comm_code.setText(listitem.getcomm_code());
holder.item_description.setText(listitem.getitem_description());
setAnimation(holder.itemView, position);
}
private void setAnimation(View itemView, int position) {
// If the bound view wasn't previously displayed on screen, it's animated
if (position > lastPosition)
{
Animation animation = AnimationUtils.loadAnimation(itemView.getContext(), R.anim.up_from_bottom);
itemView.startAnimation(animation);
lastPosition = position;
}
else{
Animation animation = AnimationUtils.loadAnimation(itemView.getContext(), R.anim.down_from_top);
//android.R.anim.slide_in_left
itemView.startAnimation(animation);
lastPosition = position;
}
}
#Override
public int getItemCount() {
return listitems2.size();
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public int getItemViewType(int position) {
return position;
}
public class RViewHolder extends RecyclerView.ViewHolder{
public TextView quantity_entitle,comm_code,item_description;
public RViewHolder(View itemView) {
super(itemView);
quantity_entitle=(TextView)itemView.findViewById(R.id.quantity_entitle);
comm_code=(TextView)itemView.findViewById(R.id.comm_code);
item_description=(TextView)itemView.findViewById(R.id.item_description);
}
}
}

You have to add LayoutManager to RecyclerView . Use setLayoutManager (RecyclerView.LayoutManager layout) method to set LayoutManager to RecyclerView. If you don't set any LayoutManager you will not see any data.
LinearLayoutManager manager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(manager);

final LinearLayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerview.setLayoutManager(layoutManager);
Hope to help you.

Please set RecyclerView's layoutmanager with setLayoutManager method.

Set the layout manager to the recylerView
rcview1.setAdapter(cmpadapter1);
rcview1.setLayoutManager(new LinearLayoutManager(this));

make some change in home activity like
private CommdityviewAdapter cmpadapter1; // replace private RecyclerView.Adapter cmpadapter1;
rcview1.setLayoutManager(new LinearLayoutManager(this));
and when you set the adapter in recyclerview then after notifiy to adapter.
cmpadapter1.notifyDataSetChanged();

Null pointer exception at method RecyclerView.setLayoutManager

Im facing issues with RecyclerViewAdapter
Following is my error :
java.lang.NullPointerException: Attempt to invoke virtual method 'void
android.support.v7.widget.RecyclerView.setLayoutManager(andr‌​oid.support.v7.widge‌​t.RecyclerView$Layou‌​tManager)'
on line :
recyclerView.setLayoutManager(mLayoutManager);
I set adapter recyclerview when fragment is create and when user click an item in recyclerview , it calls api to update this recyclerview but problem is when user click item above exception occurs
How to fix it
Following is my code :
recyclerView = (RecyclerView) lay_custom_center_post_topic.findViewById(R.id.lv_poll_feed);
AdapDetailTopicPoll adapDetailTopicPoll = new AdapDetailTopicPoll(timelineFeedListModels.get(i).getPost().getPoll());
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getActivity().getApplicationContext());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(adapDetailTopicPoll);
adapDetailTopicPoll.notifyDataSetChanged();
new_position = i;
public void sendVodePoll(final int position, String poll_id,final int new_position, final List<ProfileFeedListModelTwo.PostBean.PollBean> poll) {
RequestParams params = new RequestParams();
String URL = "xxxx/xx";
params.put("poll_id", poll_id);
AsyncHttpClient client = new AsyncHttpClient();
client.post(URL, params, new JsonHttpResponseHandler() {
#Override
public void onSuccess(int statusCode, Header[] headers, JSONArray response) {
ArrayList<ProfileFeedListModelTwo.PostBean.PollBean> pollBeanArrayList = new ArrayList<ProfileFeedListModelTwo.PostBean.PollBean>();
StringBuilder result = new StringBuilder();
String vote = null;
String poll_id=null;
String status_vote=null;
Gson gson = new Gson();
try {
List<TopicVoteModel> topicVoteModels = new ArrayList<>();
for (int i=0 ; i<response.length() ; i++){
JSONObject jsonObject = response.getJSONObject(i);
vote = jsonObject.getString("vote");
topicVoteModels.add(gson.fromJson(String.valueOf(jsonObject), TopicVoteModel.class));
}
boolean new_status_vote = Boolean.parseBoolean(status_vote);
poll.get(position).setVote(Integer.parseInt(vote));
poll.get(position).setStatus_vote(new_status_vote);
for (ProfileFeedListModelTwo.PostBean.PollBean pollBean : poll){
pollBeanArrayList.add(pollBean);
}
adapDetailTopicPoll = new AdapDetailTopicPoll(pollBeanArrayList, context);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(mLayoutManager); //inline this error
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(adapDetailTopicPoll);
adapDetailTopicPoll.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
adapter
public class AdapDetailTopicPoll extends RecyclerView.Adapter<AdapDetailTopicPoll.MyViewHolder> {
SearchDetailFragment searchDetailFragment = new SearchDetailFragment();
Context context;
private List<ProfileFeedListModelTwo.PostBean.PollBean> poll = new ArrayList<ProfileFeedListModelTwo.PostBean.PollBean>();
public AdapDetailTopicPoll( List<ProfileFeedListModelTwo.PostBean.PollBean> poll ,Context context){
this.poll = poll;
this.context=context;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.custom_profile_feed_topic_poll,parent,false);
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
holder.tx_poll.setText(""+poll.get(position).getName());
if (poll.get(position).isStatus_vote()==false){
holder.img_vote.setImageResource(R.drawable.vote_t_1);
holder.tx_count_vote.setText(""+poll.get(position).getVote());
}else {
holder.img_vote.setImageResource(R.drawable.vote_t_2);
holder.tx_count_vote.setText(""+poll.get(position).getVote());
}
}
#Override
public int getItemCount() {
return poll.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView tx_poll,tx_count_vote;
public ImageView img_vote;
public MyViewHolder(View view) {
super(view);
tx_poll = (TextView) view.findViewById(R.id.tx_poll);
tx_count_vote = (TextView) view.findViewById(R.id.tx_count_vote);
img_vote = (ImageView) view.findViewById(R.id.img_vote);
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ProfileFragment.poll_id = String.valueOf(poll.get(getAdapterPosition()).getId());
searchDetailFragment.sendVodePoll(getAdapterPosition(),ProfileFragment.poll_id,SearchDetailFragment.new_position,poll);
}
});
}
}
}

Write these lines directly in onCreate() method of the activity
adapDetailTopicPoll = new AdapDetailTopicPoll(pollBeanArrayList, context);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(adapDetailTopicPoll);
and initialize the adapter and arraylist as the global variable.

In RecyclerView there are 2 ways that are commonly used - In the form of a List or in the form of a Grid. So for list formation you'll provide a layout manager like this -
LinearLayoutManager layoutManagerFuture = new LinearLayoutManager(context);
layoutManagerFuture.setOrientation(LinearLayoutManager.VERTICAL);
and for Grid formation
GridLayoutManager layoutManager = new GridLayoutManager(context, totalItemsInOneRow);
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);