Develop Reference

This error is coming while doing intent Cannot resolve method 'putExtra(java.lang.String, <lambda parameter>)'?

I am getting this error when doing intent. I don't know why it is coming. I need to go to the fragment to activity. I need to go to the next activity with the api in this application. I have tried many times and I am not getting the answer.**Cannot resolve method 'putExtra(java.lang.String, <lambda parameter>)'**I have given the image below How to do fragment to activity intent i am new android devloper
package com.kannada.newspaper.india.utils;
import static com.kannada.newspaper.india.Constant.EXTRA_OBJC;
import static com.kannada.newspaper.india.Constant.getApiUrl;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.GridView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import androidx.fragment.app.Fragment;
import com.kannada.newspaper.india.AppConfig;
import com.kannada.newspaper.india.Constant;
import com.kannada.newspaper.india.MainActivity;
import com.kannada.newspaper.india.R;
import com.kannada.newspaper.india.activities.ActivityCategoryDetail;
import com.kannada.newspaper.india.adapters.GalleryAdapter;
import com.kannada.newspaper.india.model.Category;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class FragmentCategory extends Fragment {
private Call<CallbackHome> callbackCall = null;
SharedPref sharedPref;
private View root_view;
public static final String EXTRA_OBJC = "key.EXTRA_OBJC";
private GalleryAdapter adapterCategory;
private GridView gridView;
private List<Category> mensWears;
private GalleryAdapter adapter;
private Category category;
public FragmentCategory() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,
Bundle savedInstanceState) {
requestAction();
category = (Category) getActivity().getIntent().getSerializableExtra(Constant.EXTRA_OBJC);
// Inflate the layout for this fragment
root_view = inflater.inflate(R.layout.fragment_phones,container,false);
((TextView) root_view.findViewById(R.id.txt_title_category)).setText(getResources().getString(R.string.home_title_category));
return root_view;
}
private void requestAction() {
new Handler().postDelayed(this::requestHomeData, Constant.DELAY_TIME);
}
private void requestHomeData() {
this.callbackCall = RestAdapter.createAPI(getApiUrl).getHome(AppConfig.REST_API_KEY);
this.callbackCall.enqueue(new Callback<CallbackHome>() {
public void onResponse(Call<CallbackHome> call, Response<CallbackHome> response) {
CallbackHome responseHome = response.body();
if (responseHome == null || !responseHome.status.equals("ok")) {
return;
}
displayData(responseHome);
}
public void onFailure(Call<CallbackHome> call, Throwable th) {
Log.e("onFailure", th.getMessage());
if (!call.isCanceled()) {
}
}
});
}
private void displayData(CallbackHome responseHome) {
displayCategory(responseHome.category);
}
private void displayCategory(List<Category> list) {
GridView gridView = (GridView) root_view.findViewById(R.id.gridHolder);
adapterCategory = new GalleryAdapter(getActivity(), list);
gridView.setAdapter(adapterCategory);
GalleryAdapter.setOnItemClickListener((v, obj, position) -> {
Intent intent = new Intent(getActivity(), ActivityCategoryDetail.class);
intent.putExtra(EXTRA_OBJC, obj);
startActivity(intent);
});
LinearLayout lyt_category = root_view.findViewById(R.id.lyt_category);
if (list.size() > 0) {
// lyt_category.setVisibility(View.VISIBLE);
} else {
// lyt_category.setVisibility(View.GONE);
}
}
}
GalleryAdapter adapter
public class GalleryAdapter extends BaseAdapter {
private Context context;
private List<Category> mensWears;
public GalleryAdapter(Context context, List<Category> mensWears) {
this.context = context;
this.mensWears = mensWears;
}
public static void setOnItemClickListener(Object o) {
}
#Override
public int getCount() {
return mensWears.size();
}
#Override
public Object getItem(int i) {
return null;
}
#Override
public long getItemId(int i) {
return 0;
}
#Override
public View getView(int i,View view,ViewGroup viewGroup) {
final Category mensWear = mensWears.get(i);
if (view == null) {
final LayoutInflater layoutInflater = LayoutInflater.from(context);
view = layoutInflater.inflate(R.layout.custom_gallery_layout, null);
}
//For text
TextView prdId = view.findViewById(R.id.category_name);
ImageView imageView = view.findViewById(R.id.category_image);
// prdId.setText(prdId.toString());
Picasso.get()
.load(getApiUrl + "/upload/category/" + mensWears.get(i).category_image())
.placeholder(R.drawable.ic_thumbnail)
.into(imageView);
prdId.setText(mensWears.get(i).getItemName());
// //For images
// final ImageView imageView = view.findViewById(R.id.name);
// if(!TextUtils.isEmpty(mensWear.getItemName())){
//
//// Picasso.with(context).load(imageUrlFromServer+mensWear.category_image())
//// .into(imageView);
return view;
}
}

You cannot put Object type in putExtra , it has to be either serailized, string, double and other primitive type.
You can do like this:
Category category = (Category)adapter.getItemAtPosition(pos);
or this should also work:
Category category = (Category) obj
then,
intent.putExtra(EXTRA_OBJC,category)
Note: Your Category class should implement parcelable or serilizable to be passed as an intent.
public class Category implements Serializable {
..........}

ExpandableList View from Json

Currently working on a ExpandableListView in android using RecyclerView. I have done almost all the thing but somehow I am getting a NullpointerException which I can not sort out.Any help will be appreciated.
I am sharing the code snippet and also the git link
Used Library
Code I have tried
The app is crasing at this line in the apadter class
public DriverScheduleExpandableAdapter(Context mContext, #NonNull
List<DriverSchedule.Schedules> parentList) {
super(parentList);//////**this is where the app is crashing**
mRecipeList = parentList;
mInflater = LayoutInflater.from(mContext);
}
Error coming is :
Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Iterator java.util.List.iterator()' on a null object reference
at com.bignerdranch.expandablerecyclerview.model.ExpandableWrapper.generateChildItemList(ExpandableWrapper.java:99)
at com.bignerdranch.expandablerecyclerview.model.ExpandableWrapper.<init>(ExpandableWrapper.java:33)
at com.bignerdranch.expandablerecyclerview.ExpandableRecyclerAdapter.generateParentWrapper(ExpandableRecyclerAdapter.java:1357)
at com.bignerdranch.expandablerecyclerview.ExpandableRecyclerAdapter.generateFlattenedParentChildList(ExpandableRecyclerAdapter.java:1326)
at com.bignerdranch.expandablerecyclerview.ExpandableRecyclerAdapter.<init>(ExpandableRecyclerAdapter.java:120)
at com.rtstl.expandablelistview.adapter.DriverScheduleExpandableAdapter.<init>(DriverScheduleExpandableAdapter.java:23)
at com.rtstl.expandablelistview.MainActivity.inflateadapter(MainActivity.java:50)
at com.rtstl.expandablelistview.MainActivity.initview(MainActivity.java:41)
at com.rtstl.expandablelistview.MainActivity.onCreate(MainActivity.java:36)
at android.app.Activity.performCreate(Activity.java:6357)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2408)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2515) 
at android.app.ActivityThread.access$1000(ActivityThread.java:154) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1379) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:157) 
at android.app.ActivityThread.main(ActivityThread.java:5571) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:745) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:635) 
MainActivity.java
package com.rtstl.expandablelistview;
import android.content.Context;
import android.databinding.DataBindingUtil;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.widget.Toast;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import com.rtstl.expandablelistview.adapter.DriverScheduleAdapter;
import com.rtstl.expandablelistview.adapter.DriverScheduleExpandableAdapter;
import com.rtstl.expandablelistview.databinding.ActivityMainBinding;
import com.rtstl.expandablelistview.model.DriverSchedule;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
public class MainActivity extends AppCompatActivity {
ActivityMainBinding binding;
Context mContext;
DriverSchedule list_driver;
DriverScheduleAdapter adapter;
DriverScheduleExpandableAdapter adapterExp;
Gson gson;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mContext=this;
gson=new Gson();
initview();
}
private void initview() {
binding= DataBindingUtil.setContentView(this, R.layout.activity_main);
inflateadapter();
}
private void inflateadapter() {
////for reading file from raw folder otherwise it's not required
list_driver= gson.fromJson(readFileFromRawDirectory(R.raw.driverschedule), new TypeToken<DriverSchedule>(){}.getType());
////////////////////////////////////////
Toast.makeText(mContext,""+list_driver.getData().getSclist().size(),Toast.LENGTH_SHORT).show();
adapterExp = new DriverScheduleExpandableAdapter(mContext, list_driver.getData().getSclist());
binding.rvRecycle.setLayoutManager(new LinearLayoutManager(this));
binding.rvRecycle.setAdapter(adapter);
}
private String readFileFromRawDirectory(int resourceId){
InputStream iStream = this.getResources().openRawResource(resourceId);
ByteArrayOutputStream byteStream = null;
try {
byte[] buffer = new byte[iStream.available()];
iStream.read(buffer);
byteStream = new ByteArrayOutputStream();
byteStream.write(buffer);
byteStream.close();
iStream.close();
//inflateadapter();
} catch (IOException e) {
e.printStackTrace();
}
return byteStream.toString();
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.v7.widget.RecyclerView
android:id="#+id/rv_Recycle"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
</layout>
Adapter class
package com.rtstl.expandablelistview.adapter;
import android.content.Context;
import android.support.annotation.NonNull;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.bignerdranch.expandablerecyclerview.ExpandableRecyclerAdapter;
import com.rtstl.expandablelistview.R;
import com.rtstl.expandablelistview.model.DriverSchedule;
import java.util.List;
public class DriverScheduleExpandableAdapter extends ExpandableRecyclerAdapter<DriverSchedule.Schedules, DriverSchedule.Alloted_kids, RouteViewHolder, KidViewHolder> {
private LayoutInflater mInflater;
private List<DriverSchedule.Schedules> mRecipeList;
private static final int PARENT_NORMAL = 1;
private static final int CHILD_NORMAL = 3;
public DriverScheduleExpandableAdapter(Context mContext, #NonNull List<DriverSchedule.Schedules> parentList) {
super(parentList);//////**this is where the app is crashing**
mRecipeList = parentList;
mInflater = LayoutInflater.from(mContext);
}
#NonNull
#Override
public RouteViewHolder onCreateParentViewHolder(#NonNull ViewGroup parentViewGroup, int viewType) {
View recipeView;
switch (viewType) {
default:
case PARENT_NORMAL:
recipeView = mInflater.inflate(R.layout.group_item, parentViewGroup, false);
break;
}
return new RouteViewHolder(recipeView);
}
#NonNull
#Override
public KidViewHolder onCreateChildViewHolder(#NonNull ViewGroup childViewGroup, int viewType) {
View ingredientView;
switch (viewType) {
default:
case CHILD_NORMAL:
ingredientView = mInflater.inflate(R.layout.child_item, childViewGroup, false);
break;
}
return new KidViewHolder(ingredientView);
}
#Override
public void onBindParentViewHolder(#NonNull RouteViewHolder parentViewHolder, int parentPosition, #NonNull DriverSchedule.Schedules parent) {
parentViewHolder.bind(parent);
}
#Override
public void onBindChildViewHolder(#NonNull KidViewHolder childViewHolder, int parentPosition, int childPosition, #NonNull DriverSchedule.Alloted_kids child) {
childViewHolder.bind(child);
}
#Override
public int getParentViewType(int parentPosition) {
return PARENT_NORMAL;
}
#Override
public int getChildViewType(int parentPosition, int childPosition) {
return CHILD_NORMAL;
}
#Override
public boolean isParentViewType(int viewType) {
return viewType == PARENT_NORMAL;
}
}
DriverSchedule.java
package com.rtstl.expandablelistview.model;
import android.databinding.BaseObservable;
import com.bignerdranch.expandablerecyclerview.model.Parent;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
import java.util.List;
/**
* Created by User1 on 09-03-2018.
*/
public class DriverSchedule extends BaseObservable {
#SerializedName("status")
#Expose
public String status;
#SerializedName("msg")
#Expose
public String msg;
#SerializedName("data")
#Expose
public Data data;
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public Data getData() {
return data;
}
public void setData(Data data) {
this.data = data;
}
public class Data {
#SerializedName("schedules")
#Expose
List<Schedules> sclist;
#SerializedName("driver_details")
#Expose
Driver_details driver_details;
public List<Schedules> getSclist() {
return sclist;
}
public void setSclist(List<Schedules> sclist) {
this.sclist = sclist;
}
public Driver_details getDriver_details() {
return driver_details;
}
public void setDriver_details(Driver_details driver_details) {
this.driver_details = driver_details;
}
}
public class Schedules implements Parent<Alloted_kids> {
#SerializedName("is_active")
#Expose
public String is_active;
#SerializedName("route_details")
#Expose
public Route_details route_details;
#SerializedName("alloted_kids")
#Expose
public List<Alloted_kids> alloted_kids;
public String getIs_active() {
return is_active;
}
public void setIs_active(String is_active) {
this.is_active = is_active;
}
public Route_details getRoute_details() {
return route_details;
}
public void setRoute_details(Route_details route_details) {
this.route_details = route_details;
}
public List<Alloted_kids> getAlloted_kids() {
return alloted_kids;
}
public void setAlloted_kids(List<Alloted_kids> alloted_kids) {
this.alloted_kids = alloted_kids;
}
#Override
public List<Alloted_kids> getChildList() {
return null;
}
#Override
public boolean isInitiallyExpanded() {
return false;
}
}
public class Driver_details {
#SerializedName("driver_details")
#Expose
public Driver_details1 driver_details;
public Driver_details1 getDriver_details() {
return driver_details;
}
public void setDriver_details(Driver_details1 driver_details) {
this.driver_details = driver_details;
}
}
public class Route_details {
#SerializedName("ds_id")
#Expose
public String ds_id;
#SerializedName("kidpool_route_id")
#Expose
public String kidpool_route_id;
public String getDs_id() {
return ds_id;
}
public void setDs_id(String ds_id) {
this.ds_id = ds_id;
}
public String getKidpool_route_id() {
return kidpool_route_id;
}
public void setKidpool_route_id(String kidpool_route_id) {
this.kidpool_route_id = kidpool_route_id;
}
}
public class Alloted_kids {
#SerializedName("kid_name")
#Expose
public String kid_name;
#SerializedName("kid_image")
#Expose
public String kid_image;
public String getKid_name() {
return kid_name;
}
public void setKid_name(String kid_name) {
this.kid_name = kid_name;
}
public String getKid_image() {
return kid_image;
}
public void setKid_image(String kid_image) {
this.kid_image = kid_image;
}
}
public class Driver_details1 {
#SerializedName("driver_id")
#Expose
public String driver_id;
#SerializedName("driver_name")
#Expose
public String driver_name;
public String getDriver_id() {
return driver_id;
}
public void setDriver_id(String driver_id) {
this.driver_id = driver_id;
}
public String getDriver_name() {
return driver_name;
}
public void setDriver_name(String driver_name) {
this.driver_name = driver_name;
}
}
}
KidViewHolder.java
package com.rtstl.expandablelistview.adapter;
import android.support.annotation.NonNull;
import android.view.View;
import android.widget.TextView;
import com.bignerdranch.expandablerecyclerview.ChildViewHolder;
import com.rtstl.expandablelistview.R;
import com.rtstl.expandablelistview.model.DriverSchedule;
class KidViewHolder extends ChildViewHolder{
private TextView mIngredientTextView;
public KidViewHolder(#NonNull View itemView) {
super(itemView);
mIngredientTextView = (TextView) itemView.findViewById(R.id.tv_childname);
}
public void bind(#NonNull DriverSchedule.Alloted_kids ingredient) {
mIngredientTextView.setText(ingredient.getKid_name());
}
}
RouteViewHolder.java
package com.rtstl.expandablelistview.adapter;
import android.annotation.SuppressLint;
import android.os.Build;
import android.support.annotation.NonNull;
import android.view.View;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;
import android.widget.TextView;
import com.bignerdranch.expandablerecyclerview.ParentViewHolder;
import com.rtstl.expandablelistview.R;
import com.rtstl.expandablelistview.model.DriverSchedule;
class RouteViewHolder extends ParentViewHolder {
private static final float INITIAL_POSITION = 0.0f;
private static final float ROTATED_POSITION = 180f;
#NonNull
private final ImageView mArrowExpandImageView;
private TextView mRecipeTextView;
public RouteViewHolder(#NonNull View itemView) {
super(itemView);
mRecipeTextView = (TextView) itemView.findViewById(R.id.group_name);
mArrowExpandImageView = (ImageView) itemView.findViewById(R.id.iv_exp);
}
public void bind(#NonNull DriverSchedule.Schedules recipe) {
mRecipeTextView.setText(recipe.getRoute_details().getKidpool_route_id());
}
#SuppressLint("NewApi")
#Override
public void setExpanded(boolean expanded) {
super.setExpanded(expanded);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
if (expanded) {
mArrowExpandImageView.setRotation(ROTATED_POSITION);
} else {
mArrowExpandImageView.setRotation(INITIAL_POSITION);
}
}
}
#Override
public void onExpansionToggled(boolean expanded) {
super.onExpansionToggled(expanded);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
RotateAnimation rotateAnimation;
if (expanded) { // rotate clockwise
rotateAnimation = new RotateAnimation(ROTATED_POSITION,
INITIAL_POSITION,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
} else { // rotate counterclockwise
rotateAnimation = new RotateAnimation(-1 * ROTATED_POSITION,
INITIAL_POSITION,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
}
rotateAnimation.setDuration(200);
rotateAnimation.setFillAfter(true);
mArrowExpandImageView.startAnimation(rotateAnimation);
}
}
}

See this issue it seems that your list has some null values
https://github.com/bignerdranch/expandable-recycler-view/issues/321
I ran your code and logged your list you have null values in a list
check this method
#Override
public List<Alloted_kids> getChildList() {
return null;
}
this method should return non null value this method only causing problem
use return Collections.emptyList(); instead of return null there

Android Recycler View caching

I'm using volley to load data using JSON Parsing in to a recycler view. I've used recylcer view before, but somehow, the downloaded data is persistent this time, meaning its still there after the app is closed, maybe stays in cache. I'm not sure, what I'm doing wrong here. Any help is appreciated, thanks.
Edit: The application is storing downloaded data after the app is closed, which doesn't happen when using recycler view.
This is my Activity Class:
package com.example.recyclerview;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
public class PostActivity extends AppCompatActivity implements
OnItemClick{
private ArrayList<PostData> posts = new ArrayList<>();
private PostRecycleViewAdapter viewAdapter;
private String listingJsonUrl = "https://jsonplaceholder.typicode.com/posts/";
Toolbar toolbar;
private ProgressDialog progressDialog;
private RequestQueue requestQueue;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
progressDialog = new ProgressDialog(this);
progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progressDialog.setCancelable(true);
final RecyclerView.LayoutManager viewLayoutManager = new LinearLayoutManager(getApplicationContext());
viewAdapter = new PostRecycleViewAdapter(posts);
final RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(viewLayoutManager);
recyclerView.setAdapter(viewAdapter);
viewAdapter.setClickListener(this);
new DownloadData().execute(listingJsonUrl);
}
#Override
public void onClick(View view, int position) {
final PostData data = posts.get(position);
String title;
int id;
Intent commentIntent = new Intent(this, CommentsActivity.class);
id = data.getId();
title = data.getTitle();
if(title.length() > 25){
title = title.substring(0,25);
title = title.concat("..");
}
commentIntent.putExtra("title",title) ;
commentIntent.putExtra("id", id);
startActivity(commentIntent);
}
class DownloadData extends AsyncTask<String, String, String>{
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
}
#Override
protected String doInBackground(String... url) {
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Request.Method.GET, url[0], new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
try {
JSONArray jsonArray = new JSONArray(response.toString());
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
PostData postData = new PostData(jsonObject.getInt("id"),jsonObject.getString("title"), jsonObject.getString("body"));
posts.add(postData);
viewAdapter.notifyDataSetChanged();
}
}
catch (JSONException e)
{
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.d("JsonError", error.getMessage());
}
});
getRequestQueue().add(jsonArrayRequest);
return null;
}
}
public RequestQueue getRequestQueue()
{
if (requestQueue == null)
{
requestQueue = com.android.volley.toolbox.Volley.newRequestQueue(getApplicationContext());
}
return requestQueue;
}
}
This is my RecyclerView Adapter Class:
package com.example.recyclerview;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.List;
public class PostRecycleViewAdapter extends RecyclerView.Adapter<PostRecycleViewAdapter.ViewHolder>
{
private List<PostData> postData;
private OnItemClick itemClick;
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public TextView title, body;
public ViewHolder(View view){
super(view);
title = (TextView) view.findViewById(R.id.title);
body = (TextView) view.findViewById(R.id.body);
view.setTag(view);
view.setOnClickListener(this);
}
#Override
public void onClick(View view) {
if(itemClick != null) itemClick.onClick(view, getAdapterPosition());
}
}
public PostRecycleViewAdapter(List<PostData> postData)
{
this.postData = postData;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemLayout = LayoutInflater.from(parent.getContext()).inflate(R.layout.post_recycler_view,parent,false);
return new ViewHolder(itemLayout);
}
#Override
public void onBindViewHolder(PostRecycleViewAdapter.ViewHolder holder, int position) {
PostData data = postData.get(position);
holder.title.setText(data.getTitle());
holder.body.setText(data.getBody());
}
#Override
public int getItemCount() {
return postData.size();
}
#Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);}
public void setClickListener(OnItemClick itemClick) {
this.itemClick = itemClick;
}
}
And this is the data item class:
package com.example.recyclerview;
public class PostData {
private String title, body;
private int id;
public PostData(int id, String title, String body)
{
this.id = id;
this.title = title;
this.body = body;
}
public String getTitle() {
return title;
}
public String getBody() {
return body;
}
public int getId() {
return id;
}
}

Android: List not pass to RecyclerView

I'm passing a value from MainActivity.class to this fragment ResultFrag.class. In this class, it's supposed to display the places that is within the requested value from the user's current location.
The json return is correct.
I also tried to debug and display the item in the myList through Logcat and it is fine. So meaning that the json is parsed correctly and it's being added to the myList.
myAdapter = new MyAdapter(getActivity(), getTheList());
This particular line that pass the list to the custom adapter; I don't think it's getting the list from the getTheList() method. Because I tried debugging using below codes by putting it in onCreateView but it's not logging anything:
for (int b = 0; b < getTheList().size(); b++) {
Log.d("list: ", Integer.toString(b) + " : " + getTheList().get(b).getPlace());
}
Can anyone help? I've been working on this since yesterday.
import android.location.Location;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationServices;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class ResultFrag extends Fragment implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
double latitude, longitude;
String lat, lng;
private Bundle bundle;
private String data;
private static final String TAG_URL_DISTANCE = "///remove link///";
private static final String LOG_DISTANCE = ResultFrag.class.getSimpleName();
private MyAdapter myAdapter;
private RecyclerView recyclerView;
List<GetterSetter> myList = new ArrayList<>();
private static final String TAG = ResultFrag.class.getSimpleName();
private static final int REQUEST_CODE = 1000;
Location location;
GoogleApiClient googleClient;
public ResultFrag() {
}
public void searchPlace(final String dist, final String latitude, final String longitude) {
StringRequest stringRequest = new StringRequest(Request.Method.POST, TAG_URL_DISTANCE, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
Log.e(LOG_DISTANCE, response.toString());
try {
JSONArray arr = new JSONArray(response);
for (int i = 0; i < arr.length(); i++) {
JSONObject obj = arr.getJSONObject(i);
GetterSetter getterSetter = new GetterSetter();
getterSetter.setId(obj.getString("id"));
getterSetter.setPlace(obj.getString("name"));
getterSetter.setDistance(obj.getInt("distance"));
myList.add(getterSetter);
}
for (int b = 0; b < getTheList().size(); b++) {
Log.d("list: ", Integer.toString(b) + " : " + getTheList().get(b).getPlace());
}
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getContext(), "JSONException: " + e.getMessage(), Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(LOG_DISTANCE, "Volley Error: " + error.getMessage());
Toast.makeText(getContext(), error.getMessage(), Toast.LENGTH_LONG).show();
}
}) {
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
params.put("dist", dist);
params.put("latitude", latitude);
params.put("longitude", longitude);
return params;
}
};
Volley.newRequestQueue(getContext()).add(stringRequest);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View rootView = inflater.inflate(R.layout.result_frag, container, false);
bundle = this.getArguments();
data = bundle.getString(MainActivity.option);
if (checkGooglePlayServices()) {
buildGoogleClient();
}
lat = getLatitude();
lng = getLongitude();
Log.d("radius", data);
Log.d("latitude", lat);
Log.d("longitude", lng);
recyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerView);
myAdapter = new MyAdapter(getActivity(), getTheList());
recyclerView.setAdapter(myAdapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
/* recyclerView.addOnItemTouchListener(
new RecyclerItemClickListener(this, new RecyclerItemClickListener.OnItemClickListener() {
#Override
public void onItemClick(View view, int position) {
}
})
);*/
return rootView;
}
private boolean checkGooglePlayServices() {
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getContext());
if (resultCode != ConnectionResult.SUCCESS) {
if (GooglePlayServicesUtil.isUserRecoverableError(resultCode)) {
// Show error
GooglePlayServicesUtil.getErrorDialog(resultCode, getActivity(), REQUEST_CODE).show();
} else {
Toast.makeText(getContext(),
"No GPS",
Toast.LENGTH_LONG).show();
}
return false;
}
return true;
}
protected synchronized void buildGoogleClient() {
googleClient = new GoogleApiClient.Builder(getActivity())
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
#Override
public void onStart() {
super.onStart();
if (googleClient != null) {
googleClient.connect();
}
}
#Override
public void onResume() {
super.onResume();
checkGooglePlayServices();
}
#Override
public void onConnected(Bundle bundle) {
location = LocationServices.FusedLocationApi.getLastLocation(googleClient);
searchPlace(data, getLatitude(), getLongitude());
Toast.makeText(getContext(), getLatitude() + ", " + getLongitude(), Toast.LENGTH_LONG).show();
}
public List<GetterSetter> getTheList() {
return myList;
}
public String getLatitude() {
if (location != null) {
latitude = location.getLatitude();
}
return String.valueOf(latitude);
}
public String getLongitude() {
if (location != null) {
longitude = location.getLongitude();
}
return String.valueOf(longitude);
}
#Override
public void onConnectionSuspended(int i) {
googleClient.connect();
}
#Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Log.i(TAG, "Connection failed: ConnectionResult.getErrorCode() = "
+ connectionResult.getErrorCode());
}
}
MyAdapter.class
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.Collections;
import java.util.List;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder>{
List<GetterSetter> data = Collections.emptyList();
private LayoutInflater layoutInflater;
private Context context;
public MyAdapter (Context context, List<GetterSetter> data) {
this.context = context;
this.data = data;
layoutInflater = layoutInflater.from(context);
}
#Override
public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = layoutInflater.inflate(R.layout.mylist, parent, false);
MyViewHolder holder = new MyViewHolder(view);
return holder;
}
#Override
public void onBindViewHolder(MyAdapter.MyViewHolder holder, int position) {
// Get event data
GetterSetter current = data.get(position);
holder.id.setText(current.getId());
holder.place.setText(current.getPlace());
holder.distance.setText("Distance: " + String.valueOf(current.getDistance()) + " km");
}
#Override
public int getItemCount() {
return data.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView id;
TextView place;
TextView distance;
public MyViewHolder(View itemView) {
super(itemView);
id = (TextView) itemView.findViewById(R.id.placeId);
place = (TextView) itemView.findViewById(R.id.name);
distance = (TextView) itemView.findViewById(R.id.distance);
}
}
}

Did you fix it in the meantime? What I see is that you actually share the list between the adapter and the Fragment. And you make changes (add items) to the list after the adapter was constructed. But you do not call notfyDatasetChanged() on the adapter. Add that call once you are done with applyting changes to the list.
JSONArray arr = new JSONArray(response);
for (int i = 0; i < arr.length(); i++) {
JSONObject obj = arr.getJSONObject(i);
GetterSetter getterSetter = new GetterSetter();
getterSetter.setId(obj.getString("id"));
getterSetter.setPlace(obj.getString("name"));
getterSetter.setDistance(obj.getInt("distance"));
myList.add(getterSetter);
}
myAdapter.notfyDatasetChanged()

Recycler view not showing after parsing json data using Volley

Inside my tab bar i want to show my data in Recycler view by using json parsing using volley library. I parsed the data and it showing in toast perfectly.But in Recycler view its not showing Here is my codes.
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.JsonObjectRequest;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import javax.xml.transform.ErrorListener;
import info.tatwa.adupter.AdupterBoxOffice;
import info.tatwa.extras.Keys;
import info.tatwa.extras.UrlEndPoint;
import info.tatwa.login.L;
import info.tatwa.model.Movies;
import info.tatwa.network.MyApplication;
import info.tatwa.network.VolleySingleton;
import info.tatwa.newnav.R;
import info.tatwa.extras.UrlEndPoint.*;
import info.tatwa.extras.Keys.EndpointBoxOffice.*;
public class FragmentBoxOffice extends Fragment {
private VolleySingleton volleySingleton;
private RequestQueue requestQueue;
private AdupterBoxOffice adupterBoxOffice;
private ArrayList<Movies>listMovie = new ArrayList<>();
private ImageLoader imageLoader;
private DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
public static final String ROTET_TOMATO_URL_BOX_OFFICE="My url is here"
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
private RecyclerView listMovieHits;
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
/**
* 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 FragmentBoxOffice.
*/
public static FragmentBoxOffice newInstance(String param1, String param2) {
FragmentBoxOffice fragment = new FragmentBoxOffice();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
public static String getRequestUrl(int limit){
//ROTET_TOMATO_URL_BOX_OFFICE+"?apikey="+ MyApplication.ROTET_TOMATO_API_KEY+"&limit="+limit;
return UrlEndPoint.URL_BOX_OFFICE +
UrlEndPoint.URL_CHAR_QUASTIAN+
UrlEndPoint.URL_CHAR_PAREM_APIKEY +
MyApplication.ROTET_TOMATO_API_KEY +
UrlEndPoint.URL_CHAR_APPEND+
UrlEndPoint.URL_CHAR_PAREM_LIMIT + limit;
}
public FragmentBoxOffice() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
volleySingleton = VolleySingleton.getsInstance();
requestQueue = volleySingleton.getmRequestQueue();
senJsonRequest();
}
public void senJsonRequest(){
JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, getRequestUrl(10), (String)null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
paresJSONResponse(response);
listMovie =paresJSONResponse(response);
adupterBoxOffice.setMovieList(listMovie);
L.t(getActivity(), response.toString());
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getActivity(),"Error"+error.getMessage(),Toast.LENGTH_SHORT).show();
}
});
requestQueue.add(request);
}
public ArrayList<Movies> paresJSONResponse(JSONObject response){
ArrayList<Movies> listMovie = new ArrayList<>();
if(response ==null|| response.length()==0 ){
return null;
}
try {
StringBuilder data = new StringBuilder();
JSONArray arrayMovie = response.getJSONArray(Keys.EndpointBoxOffice.KEY_MOVIES);
Log.v("BIKASH", "JSON Object id" + arrayMovie);
for(int i = 0; i<arrayMovie.length();i++){
JSONObject currentMovies= arrayMovie.getJSONObject(i);
Long id =currentMovies.getLong(Keys.EndpointBoxOffice.KEY_ID);
String title=currentMovies.getString(Keys.EndpointBoxOffice.KEY_TITLE);
JSONObject objectReleaseDates=currentMovies.getJSONObject(Keys.EndpointBoxOffice.KEY_RELEASE_DATES);
String releaseDate=null;
if(objectReleaseDates.has(Keys.EndpointBoxOffice.KEY_THEATER)){
releaseDate = objectReleaseDates.getString(Keys.EndpointBoxOffice.KEY_THEATER);
}
else {
releaseDate="NA";
}
int audianceRatting=-1;
JSONObject objectRatting = currentMovies.getJSONObject(Keys.EndpointBoxOffice.KEY_RATINGS);
{
if(objectRatting.has(Keys.EndpointBoxOffice.KEY_AUDIENCE_SCORE)){
audianceRatting=objectRatting.getInt(Keys.EndpointBoxOffice.KEY_AUDIENCE_SCORE);
}
}
String synuypsis = currentMovies.getString(Keys.EndpointBoxOffice.KEY_SYNOPSIS);
String urlThumbnel = null;
JSONObject objPoster = currentMovies.getJSONObject(Keys.EndpointBoxOffice.KEY_THUMBNAIL);
if(objPoster.has(Keys.EndpointBoxOffice.KEY_THUMBNAIL)){
urlThumbnel = objPoster.getString(Keys.EndpointBoxOffice.KEY_THUMBNAIL);
}
Movies movie =new Movies();
movie.setId(id);
movie.setTitle(title);
Date date = dateFormat.parse(releaseDate);
movie.setReleaseDateTheater(date);
movie.setAudienceScore(audianceRatting);
movie.setSynopsis(synuypsis);
movie.setUrlThumbnail(urlThumbnel);
listMovie.add(movie);
// data.append(id + "\n");
}
L.t(getActivity(),listMovie.toString());
} catch (JSONException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
}
return listMovie;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view =inflater.inflate(R.layout.fragment_fragment_box_office, container, false);
listMovieHits =(RecyclerView)view.findViewById(R.id.listMovieHits);
listMovieHits.setLayoutManager(new LinearLayoutManager(getActivity()));
adupterBoxOffice = new AdupterBoxOffice(getActivity());
listMovieHits.setAdapter(adupterBoxOffice);
senJsonRequest();
return view;
}
}
My Adupter
import android.content.Context;
import android.support.v4.app.FragmentActivity;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RatingBar;
import android.widget.TextView;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.ImageLoader;
import java.util.ArrayList;
import info.tatwa.model.Movies;
import info.tatwa.myfragment.FragmentBoxOffice;
import info.tatwa.network.VolleySingleton;
import info.tatwa.newnav.R;
public class AdupterBoxOffice extends RecyclerView.Adapter<AdupterBoxOffice.ViewHolderBoxOffice> {
private LayoutInflater layoutInflater;
FragmentBoxOffice activity;
private ArrayList<Movies> listMovie = new ArrayList<>();
private VolleySingleton volleySingleton;
private ImageLoader imageLoader;
public AdupterBoxOffice(Context context){
layoutInflater=LayoutInflater.from(context);
volleySingleton=VolleySingleton.getsInstance();
imageLoader = volleySingleton.getImageLoader();
}
public void setMovieList(ArrayList<Movies>listMovie){
this.listMovie = listMovie;
notifyItemRangeChanged(0,listMovie.size());
}
#Override
public ViewHolderBoxOffice onCreateViewHolder(ViewGroup parent, int viewType) {
layoutInflater = LayoutInflater.from(parent.getContext());
View view = layoutInflater.inflate(R.layout.movie_list_itom,parent,false);
ViewHolderBoxOffice viewHolder =new ViewHolderBoxOffice(view);
return viewHolder;
}
#Override
public void onBindViewHolder(final ViewHolderBoxOffice holder, int position) {
Movies currentMovie =listMovie.get(position);
holder.movieTitle.setText(currentMovie.getTitle());
holder.movieReleaseDate.setText(currentMovie.getReleaseDateTheater().toString());
holder.movieRatting.setRating(currentMovie.getAudienceScore()/20.0f);
String urlThumbnel = currentMovie.getUrlThumbnail();
if(urlThumbnel!=null){
imageLoader.get(urlThumbnel, new ImageLoader.ImageListener() {
#Override
public void onResponse(ImageLoader.ImageContainer response, boolean isImmediate) {
holder.imagePoster.setImageBitmap(response.getBitmap());
}
#Override
public void onErrorResponse(VolleyError error) {
}
});
}
}
#Override
public int getItemCount() {
return listMovie.size();
}
static class ViewHolderBoxOffice extends RecyclerView.ViewHolder {
private ImageView imagePoster;
private TextView movieTitle;
private TextView movieReleaseDate;
private RatingBar movieRatting;
public ViewHolderBoxOffice(View itemView) {
super(itemView);
imagePoster=(ImageView)itemView.findViewById(R.id.movieThumbnail);
movieTitle =(TextView)itemView.findViewById(R.id.movieTitle);
movieReleaseDate=(TextView)itemView.findViewById(R.id.movieReleaseDate);
movieRatting=(RatingBar)itemView.findViewById(R.id.movieAudienceScore);
}
}
}
And My Model class
import android.os.Parcel;
import android.os.Parcelable;
import java.util.Date;
public class Movies{
private long id;
private String title;
private Date releaseDateTheater;
private int audienceScore;
private String synopsis;
private String urlThumbnail;
private String urlSelf;
private String urlCast;
private String urlReviews;
private String urlSimilar;
public Movies() {
}
public Movies(long id,
String title,
Date releaseDateTheater,
int audienceScore,
String synopsis,
String urlThumbnail,
String urlSelf,
String urlCast,
String urlReviews,
String urlSimilar) {
this.id = id;
this.title = title;
this.releaseDateTheater = releaseDateTheater;
this.audienceScore = audienceScore;
this.synopsis = synopsis;
this.urlThumbnail = urlThumbnail;
this.urlSelf = urlSelf;
this.urlCast = urlCast;
this.urlReviews = urlReviews;
this.urlSimilar = urlSimilar;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public Date getReleaseDateTheater() {
return releaseDateTheater;
}
public void setReleaseDateTheater(Date releaseDateTheater) {
this.releaseDateTheater = releaseDateTheater;
}
public int getAudienceScore() {
return audienceScore;
}
public void setAudienceScore(int audienceScore) {
this.audienceScore = audienceScore;
}
public String getSynopsis() {
return synopsis;
}
public void setSynopsis(String synopsis) {
this.synopsis = synopsis;
}
public String getUrlThumbnail() {
return urlThumbnail;
}
public void setUrlThumbnail(String urlThumbnail) {
this.urlThumbnail = urlThumbnail;
}
public String getUrlSelf() {
return urlSelf;
}
public void setUrlSelf(String urlSelf) {
this.urlSelf = urlSelf;
}
public String getUrlCast() {
return urlCast;
}
public void setUrlCast(String urlCast) {
this.urlCast = urlCast;
}
public String getUrlReviews() {
return urlReviews;
}
public void setUrlReviews(String urlReviews) {
this.urlReviews = urlReviews;
}
public String getUrlSimilar() {
return urlSimilar;
}
public void setUrlSimilar(String urlSimilar) {
this.urlSimilar = urlSimilar;
}
#Override
public String toString() {
return "\nID: " + id +
"\nTitle " + title +
"\nDate " + releaseDateTheater +
"\nSynopsis " + synopsis +
"\nScore " + audienceScore +
"\nurlThumbnail " + urlThumbnail +
"\nurlSelf " + urlSelf +
"\nurlCast " + urlCast +
"\nurlReviews " + urlReviews +
"\nurlSimilar " + urlSimilar +
"\n";
}
}
Please help me out .. Thanks in advance ..

After adupterBoxOffice.setMovieList(listMovie);
try add adupterBoxOffice.notifyDataSetChanged();

I found my solution.I put some wrong key during pars the Json. That's why my ArrayList returning zero.
Many many thanks to all for helping me out.