I am a beginner to android programming. I have created a recycler view which parses data from a JSON. I want to parse another JSON data which has the same data type and same layout everything but it is a different category. do I need to make another adapter for this recycler view?or i can use the same adapter,how i can use? Please help.
My Fragment Code
public class Tab1 extends Fragment implements ExampleAdapter.onItemClickListener{
private RecyclerViewPager mRecyclerView;
private ExampleAdapter mExampleAdapter;
private ArrayList<ExampleItem> mExampleList;
private RequestQueue mRequestQueue;
public static final String EXTRA_URL = "imageUrl";
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
((AppCompatActivity) getActivity()).getSupportActionBar().hide();
View rootView = inflater.inflate(R.layout.tab1, container, false);
mRecyclerView = rootView.findViewById(R.id.recycler_view);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
mExampleList = new ArrayList<>();
mRequestQueue = Volley.newRequestQueue(getActivity().getApplicationContext());
// Set the adapter here.
// Use getActivity() instead of getContext()
parseJson();
mExampleAdapter = new ExampleAdapter(getContext(), mExampleList);
mRecyclerView.setAdapter(mExampleAdapter);
mExampleAdapter.setOnItemClickListener(Tab1.this);
return rootView;
}
private void parseJson() {
String url = "http://maranamassapp.cf/json_getdata.php";
JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray jsonArray = response.getJSONArray("server_response");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject ser = jsonArray.getJSONObject(i);
String creatorname = ser.getString("head");
String imageUrl = ser.getString("image");
String cat = ser.getString("content");
String postdate = ser.getString("weburl");
String dateall = ser.getString("date");
mExampleList.add(new ExampleItem(imageUrl,creatorname,cat,postdate,dateall));
}
// Just call notifyDataSetChanged here
mExampleAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
mRequestQueue.add(request);
}
public void onItemClick(int position) {
Intent detailintent = new Intent(getContext(), DetailActivity.class);
ExampleItem clickeditem = mExampleList.get(position);
detailintent.putExtra(EXTRA_URL, clickeditem.getmDate());
startActivity(detailintent);
}
}
My Adapter Code
public class ExampleAdapter extends RecyclerView.Adapter <ExampleAdapter.ExampleViewHolder>{
private Context mContext;
private ArrayList<ExampleItem> mExampleList;
private onItemClickListener mListener;
public interface onItemClickListener{
void onItemClick(int position);
}
public void setOnItemClickListener(onItemClickListener listener){
mListener = listener;
}
public ExampleAdapter(Context context, ArrayList<ExampleItem> examplelist){
mContext =context;
mExampleList = examplelist;
}
#NonNull
#Override
public ExampleViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(mContext).inflate(R.layout.example_item,parent,false);
return new ExampleViewHolder(v);
}
#Override
public void onBindViewHolder(#NonNull ExampleViewHolder holder, int position) {
ExampleItem currentItem = mExampleList.get(position);
String imageUrl = currentItem.getmImageUrl();
String creatorName = currentItem.getmCreator();
String cat =currentItem.getmCat();
String postdate = currentItem.getmDate();
String dateall = currentItem.getmAll();
holder.mTextViewCreator.setText(creatorName);
holder.mTextViewCat.setText(cat);
holder.mDateAll.setText(dateall);
Glide.with(mContext)
.load(imageUrl)
.into(holder.mImageView);
}
#Override
public int getItemCount() {
return mExampleList.size();
}
public class ExampleViewHolder extends RecyclerView.ViewHolder{
public ImageView mImageView;
public TextView mTextViewCreator;
public TextView mTextViewCat;
public TextView mDateAll;
public ExampleViewHolder(View itemView) {
super(itemView);
mImageView = itemView.findViewById(R.id.image_view);
mTextViewCreator = itemView.findViewById(R.id.text_view_creator);
mTextViewCat = itemView.findViewById(R.id.text_view_cat);
mDateAll = itemView.findViewById(R.id.date_views);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(mListener != null){
int position = getAdapterPosition();
if (position !=RecyclerView.NO_POSITION){
mListener.onItemClick(position);
}
}
}
});
}
}
}
if you have two different category and same layout you can you
getItemViewType(int position)
method of recyclerview.
below is an example link
Every list needs an adapter, otherwise, it won't display data.
Can more than one list have the same adapter? Absolutely.
If your adapter only can display ExampleItem objects that you've stored from somewhere, though, then that's the only type of object you can use in that adapter, and subsequently show in a list. It's not clear what a "category" in your case means.
If you have a different type of object, you need a different adapter class.
If object types share some common values, you might want to brush up on some Java inheritance patterns with abstract classes and Interfaces
Another option is storing more than one ArrayList within an Adapter and using the concept of "item types". For example, all even rows are from one list, and all odd rows from another
In this code, if you are using multiple Fragments across multiple tabs, then you will need to use new ExampleAdapter and setAdapter() individually, many times
Related
I am a beginner at android. I have created a recyclerview which parses data from a JSON. I have set an onclick listener to all recyclerview item which opens new activity and show details of the recycler view item. My problem is when I click a recyclerview item it takes 4-5 seconds to load can I make this faster please help.
My Activity Code
public class Tab1 extends Fragment implements ExampleAdapter.onItemClickListener{
private RecyclerViewPager mRecyclerView;
private ExampleAdapter mExampleAdapter;
private ArrayList<ExampleItem> mExampleList;
private RequestQueue mRequestQueue;
public static final String EXTRA_URL = "imageUrl";
private ShimmerFrameLayout mShimmerViewContainer;
Button sharebuttonz;
File imagePathz;
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
((AppCompatActivity) getActivity()).getSupportActionBar().hide();
View rootView = inflater.inflate(R.layout.tab1, container, false);
mRecyclerView = rootView.findViewById(R.id.recycler_view);
mRecyclerView.setHasFixedSize(true);
mShimmerViewContainer = rootView.findViewById(R.id.shimmer_view_container);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
mExampleList = new ArrayList<>();
mRequestQueue = Volley.newRequestQueue(getActivity().getApplicationContext());
// Set the adapter here.
// Use getActivity() instead of getContext()
parseJson();
mExampleAdapter = new ExampleAdapter(getActivity(), mExampleList);
mRecyclerView.setAdapter(mExampleAdapter);
mExampleAdapter.setOnItemClickListener(Tab1.this);
return rootView;
}
private void parseJson() {
String url = "http://maranamassapp.cf/json_getdata.php";
JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray jsonArray = response.getJSONArray("server_response");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject ser = jsonArray.getJSONObject(i);
String creatorname = ser.getString("head");
String imageUrl = ser.getString("image");
String cat = ser.getString("content");
String postdate = ser.getString("weburl");
String dateall = ser.getString("date");
int type = ser.getInt("type");
mExampleList.add(new ExampleItem(imageUrl, creatorname, cat, postdate, dateall,type));
}
// Just call notifyDataSetChanged here
mExampleAdapter.notifyDataSetChanged();
mShimmerViewContainer.stopShimmerAnimation();
mShimmerViewContainer.setVisibility(View.GONE);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
mRequestQueue.add(request);
}
public void onItemClick(int position) {
Intent detailintent = new Intent(getContext(), DetailActivity.class);
ExampleItem clickeditem = mExampleList.get(position);
detailintent.putExtra(EXTRA_URL, clickeditem.getmDate());
startActivity(detailintent);
}
}
My Adapter Code
public class ExampleAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context mContext;
private ArrayList<ExampleItem> mExampleList;
private onItemClickListener mListener;
public interface onItemClickListener {
void onItemClick(int position);
}
public void setOnItemClickListener(onItemClickListener listener) {
mListener = listener;
}
public class ExampleViewHolder extends RecyclerView.ViewHolder {
public ImageView mImageView;
public TextView mTextViewCreator;
public TextView mTextViewCat;
public TextView mDateAll;
public ExampleViewHolder(View itemView) {
super(itemView);
mImageView = itemView.findViewById(R.id.image_view);
mTextViewCreator = itemView.findViewById(R.id.text_view_creator);
mTextViewCat = itemView.findViewById(R.id.text_view_cat);
mDateAll = itemView.findViewById(R.id.date_views);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (mListener != null) {
int position = getAdapterPosition();
if (position != RecyclerView.NO_POSITION) {
mListener.onItemClick(position);
}
}
}
});
}
}
Implement listener on RecyclerView instead of individual item. This is better as it avoids unnecessary OnClickListener creation.
As for the slow loading of activity, this seems to be layout optimization issue. As suggested by Oğuzhan Döngül, you should find out if problem persists on actual device. I would suggest reading Improving Layout Performance nevertheless, they show many tricks which will be of great help.
hi guys i have a card view that populate it's data from a json. I parse json with volley and it is successfull .
but in card view there is nothing to show
here is my json
{"photo":[{"id":"4","profile_id":"mahdi","caption":"hello","image_url":"https:\/\/hemispheric-suggest.000webhostapp.com\/img\/img\/birjand.jpg","profile_img_url":"https:\/\/hemispheric-suggest.000webhostapp.com\/prof\/prof\/prof_1.jpg","insert_time":"2017-07-09 11:21:44"}
and my fragment adapter :
private RecyclerView recyclerView;
private RequestQueue mRequestQueue;
ArrayList<Card> list = new ArrayList<>();
String url = "My url";
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.frag,container,false);
recyclerView = (RecyclerView) view.findViewById(R.id.recycler);
mRequestQueue = Volley.newRequestQueue(getActivity());
list();
LinearLayoutManager MyLayoutManager = new LinearLayoutManager(getActivity());
MyLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setAdapter(new Adapter(list));
return view;
}
public class Adapter extends RecyclerView.Adapter<Adapter.MyviewHolder>{
// private ArrayList<Card> list;
public Adapter(ArrayList<Card> data) {
list = data;
}
public class MyviewHolder extends RecyclerView.ViewHolder{
public TextView textView;
public ImageView imageView;
public MyviewHolder(View itemView) {
super(itemView);
textView = (TextView) itemView.findViewById(R.id.textView);
imageView = (ImageView) itemView.findViewById(R.id.imageView);
}
}
#Override
public MyviewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_row,parent,false);
return new MyviewHolder(view);
}
#Override
public void onBindViewHolder(MyviewHolder holder, int position) {
Card card = list.get(position);
holder.textView.setText(card.getName());
Glide.with(getActivity()).load(card.getImg()).into(holder.imageView);
}
#Override
public int getItemCount() {
return list.size();
}
}
public void list() {
JsonObjectRequest object = new JsonObjectRequest(Request.Method.GET, url,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try{
JSONArray array = response.getJSONArray("photo");
for (int i = 0; i <array.length() ; i++) {
JSONObject temp = array.getJSONObject(i);
Card card = new Card();
card.setName(temp.getString("profile_id"));
card.setImg(temp.getString("image_url"));
list.add(card);
}
}catch (Exception ex){
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
}
);
mRequestQueue.add(object);
}
}
Volley is asynchronus, so when you call:
recyclerView.setAdapter(new Adapter(list));
just a few milliseconds after you enqueued your request, It's very likely that the list is still empty because Volley hasn't received any response yet. You should set your adapter once you get the response inside the onResponse callback.
homepageThis is my fragment class
public class Premiums extends Fragment {
private RecyclerView recyclerPremium;
private RecyclerView.LayoutManager mLayoutManager;
private List<FeaturedAddDetails> featuredAddDetailsList = new ArrayList<>();
private List<PremiumDetails> premiumDetailslist = new ArrayList<>();
private NewestAdapter newestAdapter;
private PremiumAdapter premiumAdapter;
private String jsonResponse;
private PremiumDetails premiumDetails;
private JSONObject jsonobject;
public Premiums() {
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View mainView = inflater.inflate(R.layout.premium_fragment, container, false);
recyclerPremium = (RecyclerView) mainView.findViewById(R.id.recycler_premium);
premiumAdd();
premiumAdapter = new PremiumAdapter(getActivity().getApplicationContext(), premiumDetailslist);
recyclerPremium.setAdapter(premiumAdapter);
return mainView;
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mLayoutManager = new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);
recyclerPremium.setLayoutManager(mLayoutManager);
recyclerPremium.setHasFixedSize(true);
}
private void premiumAdd() {
PremiumRequestHandler premiumHandler = new PremiumRequestHandler("premiumADD");
premiumHandler.executeAsStringRequest(new Response.Listener<String>() {
#Override
public void onResponse(String response) {
Log.e("response", response);
JSONArray jsonarray = null;
try {
jsonarray = new JSONArray(response);
} catch (JSONException e) {
e.printStackTrace();
}
for (int i = 0; i < jsonarray.length(); i++) {
try {
jsonobject = jsonarray.getJSONObject(i);
Log.e("id", String.valueOf(jsonobject.getInt("id")));
premiumDetails = new PremiumDetails(jsonobject.getInt("id"),
jsonobject.getInt("userid"),
jsonobject.getInt("mobile"),
jsonobject.getInt("cityid"),
jsonobject.getInt("price"),
jsonobject.getInt("comments"),
jsonobject.getInt("created"),
jsonobject.getInt("categoryid"),
jsonobject.getInt("MainCategoryID"),
jsonobject.getInt("views"),
jsonobject.getInt("ImageCount"),
jsonobject.getInt("storeid"),
jsonobject.getString("title"),
jsonobject.getString("default_photo"),
jsonobject.getString("CityName"),
jsonobject.getString("CategoryName"),
jsonobject.getString("currency"),
jsonobject.getString("description"));
premiumDetailslist.add(premiumDetails);
premiumAdapter.setPremiumDetails(premiumDetailslist);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}, new BaseRequest.ErrorResponseCallback() {
#Override
public void onError(Exception exception) {
}
});
}
This is my adapter class
public class PremiumAdapter extends RecyclerView.Adapter<PremiumAdapter.MyViewHolderPremium> {
private List<PremiumDetails> premiumDetailsList;
private ImageLoader imageLoader;
private Context context;
public PremiumAdapter(Context context, List<PremiumDetails> premiumDetailsList) {
this.premiumDetailsList = premiumDetailsList;
this.context = context;
notifyDataSetChanged();
}
public void setPremiumDetails(List<PremiumDetails> premiumDetailsList) {
this.premiumDetailsList = premiumDetailsList;
notifyDataSetChanged();
}
public class MyViewHolderPremium extends RecyclerView.ViewHolder {
private TextView txtTitle,txtDescription,txtCityName,txtPrice,txtCategory,txtHour,txtPhotoNo;
private NetworkImageView imgPhoto;
public MyViewHolderPremium(View itemView) {
super(itemView);
txtTitle = (TextView)itemView.findViewById(R.id.txt_title_fad);
txtDescription = (TextView)itemView.findViewById(R.id.description_fad);
txtCityName = (TextView)itemView.findViewById(R.id.city_name_fad);
txtPrice = (TextView)itemView.findViewById(R.id.price_fad);
txtCategory = (TextView)itemView.findViewById(R.id.category_fad);
txtHour = (TextView)itemView.findViewById(R.id.hours_fad);
txtPhotoNo = (TextView)itemView.findViewById(R.id.txt_photo_no_fad);
imgPhoto=(NetworkImageView)itemView.findViewById(R.id.img_photo_lod_fad);
}
}
#Override
public MyViewHolderPremium onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.featured_ad_adapter_layout,parent,false);
final MyViewHolderPremium myViewHolderPremium = new MyViewHolderPremium(itemView);
return myViewHolderPremium;
}
#Override
public void onBindViewHolder(MyViewHolderPremium holder, int position) {
PremiumDetails premiumDetails = premiumDetailsList.get(position);
holder.txtTitle.setText(premiumDetails.getTitle());
holder.txtDescription.setText(premiumDetails.getDescription());
holder.txtCityName.setText(premiumDetails.getCityName());
holder.txtPrice.setText(Integer.toString(premiumDetails.getPrice()));
holder.txtCategory.setText(premiumDetails.getCategoryName());
holder.txtHour.setText(Integer.toString(premiumDetails.getCreated()));
holder.txtPhotoNo.setText(Integer.toString(premiumDetails.getImageCount())+" photos " );
try {
imageLoader= VolleyHandler.getImageLoader();
} catch (Exception e) {
e.printStackTrace();
}
//imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();
//imageLoader.get(featuredAddDetails.getDefault_photo(), ImageLoader.getImageListener(holder.imgPhoto, R.mipmap.ic_launcher, android.R.drawable.ic_dialog_alert));
holder.imgPhoto.setImageUrl(premiumDetails.getDefault_photo(),imageLoader);
}
#Override
public int getItemCount() {
Log.e("size", String.valueOf(premiumDetailsList.size()));
return premiumDetailsList.size();
}}
I am getting error on showing values but I got values from json and I can't add it to adapter and model class, plz help me I look stackoverflow whole day but I can't find my issue
my getItemCount() is showing as 0"
You are setting the adapter and then you are calling premiumAdd() method.First call that method and then set the adapter.
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View mainView = inflater.inflate(R.layout.premium_fragment, container, false);
recyclerPremium = (RecyclerView) mainView.findViewById(R.id.recycler_premium);
premiumAdd();
premiumAdapter = new PremiumAdapter(getActivity().getApplicationContext(), premiumDetailslist);
recyclerPremium.setAdapter(premiumAdapter);
return mainView;
Try notifyDataSetChanged() after setting data in the Constructor of your Adapter
[EDIT] Whenever your data changes, you need to inform your Adapter about it also, then call notifyDataSetChanged() on it.
You are probably setting empty data into the Adapter, your List changes, but the Adapter does not know about it.
[Update]
In addition to your Adapter constructor, add a setData(List) to your adapter to change your dataset at runtime.
public void setPremiumDetails(List<PremiumDetails> premiumDetailsList) {
this.premiumDetailsList = premiumDetailsList;
notifyDataSetChanged();
}
When your request in premiumAdd() returns, and you receive a new set of data, you call setPremiumDetails on your Adapter with the new data and the List will update.
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View mainView = inflater.inflate(R.layout.premium_fragment, container, false);
recyclerPremium = (RecyclerView) mainView.findViewById(R.id.recycler_premium);
mLayoutManager = new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);
recyclerPremium.setLayoutManager(mLayoutManager);
recyclerPremium.setHasFixedSize(true);
premiumAdd();
premiumAdapter = new PremiumAdapter(getActivity().getApplicationContext(), premiumDetailslist);
recyclerPremium.setAdapter(premiumAdapter);
return mainView;
}
and remove premiumAdapter.notifyDataSetChanged();
added adapter code:
public class RVAdapter extends RecyclerView.Adapter<RVAdapter.ViewHolder> {
ArrayList<Model> dataset;
public RVAdapter(ArrayList<Model> dataset) {
this.dataset = dataset;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.rv_item,parent,false);
return new ViewHolder(v);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
Model model = dataset.get(position);
holder.name.setText(model.name) ;
holder.status.setText(model.status);
if (model.status.equalsIgnoreCase("good"))
holder.ivStatus.setImageResource(R.drawable.ic_tick_48);
else
holder.ivStatus.setImageResource(R.drawable.ic_delete_48);
}
#Override
public int getItemCount() {
Log.e("TAG","SIZE: "+dataset.size());
return dataset.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder {
TextView name;
TextView status;
ImageView ivStatus;
RelativeLayout parent;
public ViewHolder(View itemView) {
super(itemView);
name = (TextView) itemView.findViewById(R.id.rv_item_name);
status = (TextView) itemView.findViewById(R.id.rv_item_status);
ivStatus = (ImageView) itemView.findViewById(R.id.rv_item_iv);
parent = (RelativeLayout) itemView.findViewById(R.id.rv_item_parent);
}
}
}
your notifiy adapter on every single add
for (...){
....
premiumDetailslist.add(premiumDetails);
premiumAdapter.notifyDataSetChanged();// called every time wrong
}
also provide what exact error log says
and move the notifyDataSetChanged() after the for not in the loop
if no data is showing try recyclerview.invalidate , but i wont particularly do that way, would try debugging, log every step, inspect with method in the expected sequence isnt working
please any one explain RecyclerView in fragment using volley to get json data.
Already i refered below link coding Google recyclerview in fragment
this is my first project in android, so i cannot understand that coding.
Please any one help me.
My fragmnet Coding:
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View drawer = inflater.inflate(R.layout.fragment_progress, container, false);
orderLists = new ArrayList<>();
getProgressData();
recyclerView = (RecyclerView) drawer.findViewById(R.id.progress);
adapter = new ProgressOrderListAdapter(orderLists, this);
adapter.clearAdaptor();
recyclerView.setAdapter(adapter);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
return recyclerView;
}
private void getProgressData(){
String mobilecustomertoken = SharedPreferencesManager.readPreferenceString("MobileCustomerToken", "D/N");
JSONObject progressData = new JSONObject();
try{
progressData.put("mobilecustomertoken", mobilecustomertoken);
JsonObjectRequest progressObject = new JsonObjectRequest(1, Common.OrderDetails + "progress", progressData, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject progressResponse) {
Log.d("Responseprogress", progressResponse.toString());
try {
int status = progressResponse.getInt("status");
if(status == 1) {
progressOrderProgress(progressResponse);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
Log.d("Response", "PROGRESS ERROR");
}
});
progressObject.setShouldCache(false);
ServiceBellApp.getInstance().addToRequestQueue(progressObject);
}
catch (JSONException localJSONException){
localJSONException.printStackTrace();
return;
}
}
private void progressOrderProgress(JSONObject progressResponse) throws JSONException {
JSONArray result = progressResponse.getJSONArray("orderdata");
OrderList orderListModule = new OrderList();
for(int i=0; i<result.length(); i++){
JSONObject orderData = result.getJSONObject(i);
orderListModule.setPackage_name(orderData.getString("package_name"));
orderListModule.setOrderdate(orderData.getString("orderdate"));
orderListModule.setServicedate(orderData.getString("servicedate"));
orderListModule.setServicetime(orderData.getString("servicetime"));
orderListModule.setOrderid(orderData.getString("orderid"));
orderListModule.setOrdstatus(orderData.getString("ordstatus"));
orderListModule.setOrderamount(orderData.getInt("orderamount"));
}
orderLists.add(orderListModule);
}
My adapter code:
public class OrderListAdapter extends RecyclerView.Adapter<OrderListAdapter.ViewHolder> {
List<OrderList> List;
private FragmentPending mContext;
public OrderListAdapter(List<OrderList> List, FragmentPending context) {
this.mContext = context;
this.List = List;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.order_list_view, null);
ViewHolder holder = new ViewHolder(view);
// this is where the each item is inflated.
return holder;
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
OrderList orderListsPos = List.get(position);
// this is where the data for each item is assigned
holder.textViewPackageName.setText(orderListsPos.getPackage_name());
holder.textOrderdate.setText(orderListsPos.getOrderdate());
holder.textServicedate.setText(orderListsPos.getServicedate());
holder.textServicetime.setText(orderListsPos.getServicetime());
holder.textOrderid.setText(orderListsPos.getOrderid());
holder.textOrderamount.setText("Rs." + orderListsPos.getOrderamount());
holder.textStatus.setText(orderListsPos.getOrdstatus());
}
#Override
public int getItemCount() {
return List.size();
}
public void clearAdaptor() {
List.clear();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView textViewPackageName;
public TextView textServicedate;
public TextView textServicetime;
public TextView textOrderdate;
public TextView textOrderid;
public TextView textOrderamount;
public TextView textStatus;
public ViewHolder(View itemView) {
super(itemView);
textViewPackageName = (TextView) itemView.findViewById(R.id.productName);
textOrderdate = (TextView) itemView.findViewById(R.id.orderdate);
textOrderid = (TextView) itemView.findViewById(R.id.orderno);
textOrderamount = (TextView) itemView.findViewById(R.id.orderprice);
textStatus = (TextView) itemView.findViewById(R.id.orderstatus);
}
}}
First you need four things
1 ) layout that holds the each recycler view layout item
2 ) A view holder for creating each layout
3 ) A Model Class to holds the data
4 ) Recycler Adaptor which deals with the data for the Each Layout item
FIrst create a layout item
for eample lets create a single view with only TextView in it
XML
each_item.xml
<TextView
android:id="#+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="2dp"
android:gravity="start|center_vertical"
android:textColor="#color/white"
android:textSize="18sp" />
and lets now create a view holder
i will post both code for the view holder and RecyclerAdaptor
public class Adaptor extends RecyclerView.Adapter<Adaptor.ViewHolder> {
List<Model> List = Collections.emptyList();
private Context mContext;
private LayoutInflater inflater;
public Adaptor(Context context, List<Model> List) {
inflater = LayoutInflater.from(context);
this.mContext = context;
this.List = List;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.each_item, parent, false);
final ViewHolder holder = new ViewHolder(view);
// this is where the each item is inflated.
return holder;
}
#Override
public void onBindViewHolder(WinnersViewHolder holder, int position) {
Model mModel = List.get(position);
// this is where the data for each item is assigned
holder.nameView.setText("" + mModel.getName());
}
#Override
public int getItemCount() {
return List.size();
}
public void clearAdaptor() {
List.clear();
}
public class ViewHolder extends RecyclerView.ViewHolder {
protected TextView nameView;
public ViewHolder(View itemView) {
super(itemView);
this.nameView = (TextView) itemView.findViewById(R.id.name);
}
}
}
Now the model class
public class Model {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name= name;
}
}
Now the back end is done, Lets implement it on the Fragment
List<Model> List = new ArrayList<>();
private RecyclerView mRecyclerView;
private Adaptor adaptor;
public Fragment() {
// constructor of fragment
// Required empty public constructor
}
in the onCreatView() get the id of recyclerView
View fragmentView = inflater.inflate(R.layout.fragment_layout, container, false);
mRecyclerView = (RecyclerView) fragmentView .findViewById(R.id.recycler_view);
and then pass the data to the Adaptor by creating its object
adaptor = new Adaptor(getContext(), List);
adaptor.clearAdaptor();
mRecyclerView.setAdapter(adaptor);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
You are done now, only thing pending is if you are accessing data form server call notifyDataSetChanged() or adaptor = new Adaptor(getContext(), getList()); where the getList() returns the Model data and do not call adaptor.clearAdaptor() .
hope this helps ..
EDIT
you can two ways infalte the each layout item .. one is above and second is in onCreateViewHolder
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.each_item, null);
Check this link It is really helpful for beginners for understanding concepts from start to mastering the RecyclerView.
https://github.com/codepath/android_guides/wiki/Using-the-RecyclerView
Hope this helps you to understand recycler view concepts.
RecycerView + Fragment + Volley
Fragment Code:
public class DogListFragment extends Fragment{
private RecyclerView rv;
private StaggeredGridLayoutManager llm;
private DogListAdapter adapter;
private ArrayList<DogModel> dogList;
private Context context;
public static DogListFragment getInstance(){
return new DogListFragment();
}
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
dogList = new ArrayList<>();
adapter = new DogListAdapter(context, dogList, this);
getListFromServer();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState){
View view = inflater.inflate(R.layout.fragment_dog_list, parent, false);
rv = view.findViewById(R.id.rv);
llm = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
rv.setLayoutManager(llm);
rv.setAdapter(adapter);
return view;
}
public void getListFromServer(){
String url = "https://dog.ceo/api/breed/hound/images/random/20";
RequestQueue requestQueue = Volley.newRequestQueue(context);
StringRequest request = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
JSONArray array = jsonObject.getJSONArray("message");
for(int i=0;i<array.length();i++){
String imageUrl = array.getString(i);
dogList.add(new DogModel(imageUrl));
}
adapter.updateDataSet(dogList);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
}
);
requestQueue.add(request);
}
}
Full code
Woof Repository
It has the following implementations
Fragment communication via interface
Reusing fragment by
getSupportFragmentManager().findFragmentByTag(TAG)
Which lifecycle method should have API call so that it is called just
once
How to save RecylcerView state in Fragment (Scroll position + content)
Pagination in RecyclerView
Rest Calls (Volley)
Image Rendering (Glide)
JSON Parsing
I have an adapter which won't get notified after fetching new data by Retrofit however, I'm using notifyDataSetChanged and get success in the logs but nothing works either :(
Also I tried to use local array with this adapter and it works great.
public class alberrClassNews extends Fragment {
private RecyclerView recyclerView;
private List<alberrNewsListContent> alberrNews = new ArrayList<alberrNewsListContent>();
private final String TAG = "Get JSONArray";
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.alberrnewsclass, container, false);
getActivity().setTitle("nnnn");
recyclerView = (RecyclerView) view.findViewById(R.id.alberrNewsList);
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(layoutManager);
layoutManager.setReverseLayout(true);
layoutManager.setStackFromEnd(true);
final alberrNewsAdapter aNA = new alberrNewsAdapter(getActivity(), alberrNews);
recyclerView.setAdapter(aNA);
final ProgressDialog progressDialog = new ProgressDialog(getActivity());
progressDialog.setMessage("loading");
progressDialog.show();
final Retrofit alberrRetrofit = new Retrofit.Builder()
.baseUrl("http://nn.com/abbn/")
.addConverterFactory(GsonConverterFactory.create()).build();
alberrService service = alberrRetrofit.create(alberrService.class);
Call<JSONArray> call = service.alberrNews();
call.enqueue(new Callback<JSONArray>() {
#Override
public void onResponse(Call<JSONArray> call, Response<JSONArray> response) {
progressDialog.dismiss();
Log.i(TAG, "success");
try{
JSONArray jsonArray = response.body().getJSONArray(0);
for (int i = 0 ; i < jsonArray.length() ; i++){
JSONObject jsonObject = jsonArray.getJSONObject(i);
alberrNewsListContent newsContent = new alberrNewsListContent();
newsContent.setAlberrNewsTitle(jsonObject.getString("title"));
newsContent.setAlberrNewsSubject(jsonObject.getString("subject"));
newsContent.setAlberrNewsImage(jsonObject.getString("image"));
alberrNews.add(newsContent);
}
} catch (JSONException e){
e.printStackTrace();
}
aNA.notifyDataSetChanged();
}
#Override
public void onFailure(Call<JSONArray> call, Throwable t) {
Log.i(TAG, "Failed");
progressDialog.dismiss();
Toast.makeText(getActivity().getApplicationContext(),
"no connection", Toast.LENGTH_SHORT).show();
}
});
return view;
}
Adapter Class
public class alberrNewsAdapter extends RecyclerView.Adapter<alberrNewsAdapter.ViewHolder> {
private List<alberrNewsListContent> newsListContent;
private Context context;
public alberrNewsAdapter(Context ncontext , List<alberrNewsListContent> nnewsListContent ){
this.context = ncontext;
this.newsListContent = nnewsListContent;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater
.from(parent.getContext())
.inflate(R.layout.alberrnewscontent, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(alberrNewsAdapter.ViewHolder holder, int position) {
final alberrNewsListContent newsContent = newsListContent.get(position);
holder.alberrNewsTitle.setText(newsContent.getAlberrNewsTitle());
holder.alberrNewsSubject.setText(newsContent.getAlberrNewsSubject());
Glide.with(context)
.load(newsContent.getAlberrNewsImage())
.override(300, 260)
.into(holder.alberrNewsImage);
}
#Override
public int getItemCount() {
return newsListContent.size();
}
public void replaceDataSet(List<alberrNewsListContent> alberrNews){
this.newsListContent = alberrNews;
notifyDataSetChanged();
}
public static class ViewHolder extends RecyclerView.ViewHolder{
TextView alberrNewsTitle;
TextView alberrNewsSubject;
ImageView alberrNewsImage;
CardView alberrNewsCardView;
public ViewHolder(View itemView) {
super(itemView);
alberrNewsTitle = (TextView)itemView.findViewById(R.id.alberrNewsTitle);
alberrNewsSubject = (TextView)itemView.findViewById(R.id.alberrNewsSubject);
alberrNewsImage = (ImageView)itemView.findViewById(R.id.alberrNewsImage);
alberrNewsCardView = (CardView)itemView.findViewById(R.id.alberrNewsCardView);
}
}
}
In your alberrNewsAdapter, you can create a new method called replaceDataSet() which will replace your dataset in the adapter and call notifyDataSetChanged().
private List<alberrNewsListContent> alberrNews alberrNews;
public void replaceDataSet(List<alberrNewsListContent> alberrNews){
this.alberrNews = alberrNews;
notifyDataSetChanged();
}
And in onResponse() instead of calling aNA.notifyDataSetChanged(); call aNA.replaceDataSet();
Pass new list content to the adapter via public method and call notifyDataSetChanged(); inside that method. Currently, you're not updating the list inside the adapter.