swipe to refresh recyclerview duplicate item json

swipe to refresh recyclerview duplicate item json - android

I have a problem, when i swipe to refresh the data, the first swipe is ok but after that every swipe reload and add the same data over and over again, by the end i have a list with same items over and over... I'm using a loader. I tried to clear before but i don't understand what's wrong with my code, if someone could explain it to me. Thank You.
Here my code :
public static final String EXTRA_URL = "imageUrl";
public static final String EXTRA_APKNAME = "apkname";
public static final String EXTRA_APKSIZE = "apksize";
public static final String EXTRA_APKFILE = "apkfile";
private RecyclerView mRecyclerView;
private MyAdapter mExampleAdapter;
private ArrayList<one_item> mExampleList;
private RequestQueue mRequestQueue;
private SwipeRefreshLayout swipeRefreshLayout;
#SuppressLint("RestrictedApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportActionBar().setTitle("APK VIP CHINA");
getSupportActionBar().setDefaultDisplayHomeAsUpEnabled(true);
swipeRefreshLayout = findViewById(R.id.refreshlayout);
mRecyclerView = findViewById(R.id.recycler_view);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mExampleList = new ArrayList<>();
mRequestQueue = Volley.newRequestQueue(this);
parseJSON();
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
parseJSON();
swipeRefreshLayout.setRefreshing(false);
}
});
}
private void parseJSON() {
String url = "http://apkvip.net/json2.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("data");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject hit = jsonArray.getJSONObject(i);
String creatorName = hit.getString("ten");
String creatorsize = hit.getString("apk_size");
String creatorfile = hit.getString("link_apk");
String imageUrl = hit.getString("link_img");
mExampleList.add(new one_item(imageUrl, creatorName, creatorsize, creatorfile));
}
mExampleAdapter = new MyAdapter(MainActivity.this, mExampleList);
mRecyclerView.setAdapter(mExampleAdapter);
mExampleAdapter.setOnItemClickListener(MainActivity.this);
} 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(this, activity_detail.class);
one_item clickedItem = mExampleList.get(position);
detailIntent.putExtra(EXTRA_URL, clickedItem.getmImageUrl());
detailIntent.putExtra(EXTRA_APKNAME, clickedItem.getMapkname());
detailIntent.putExtra(EXTRA_APKSIZE, clickedItem.getMapksize());
detailIntent.putExtra(EXTRA_APKFILE, clickedItem.getMapkfile());
startActivity(detailIntent);
}}
My adapter:
private ArrayList<one_item> mExampleList;
private OnItemClickListener mListener;
public interface OnItemClickListener {
void onItemClick(int position);
}
public void setOnItemClickListener(OnItemClickListener listener) {
mListener = listener;
}
public MyAdapter(Context context, ArrayList<one_item> exampleList) {
mContext = context;
mExampleList = exampleList;
}
#Override
public ExampleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(mContext).inflate(R.layout.one_item, parent, false);
return new ExampleViewHolder(v);
}
#Override
public void onBindViewHolder(ExampleViewHolder holder, int position) {
one_item currentItem = mExampleList.get(position);
String imageUrl = currentItem.getmImageUrl();
String apkname = currentItem.getMapkname();
String apksize = currentItem.getMapksize();
String apkfile = currentItem.getMapkfile();
holder.mTextViewname.setText(apkname);
holder.mTextViewsize.setText(apksize);
holder.mTextViewfile.setText(apkfile);
Picasso.get().load(imageUrl).fit().centerInside().into(holder.mImageView);
}
#Override
public int getItemCount() {
return mExampleList.size();
}
#Override
public long getItemId(int position) {
return position;
}
public class ExampleViewHolder extends RecyclerView.ViewHolder {
public ImageView mImageView;
public TextView mTextViewname, mTextViewsize, mTextViewfile;
public ExampleViewHolder(View itemView) {
super(itemView);
mImageView = itemView.findViewById(R.id.image);
mTextViewname = itemView.findViewById(R.id.name);
mTextViewsize = itemView.findViewById(R.id.size);
mTextViewfile = itemView.findViewById(R.id.file);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (mListener != null) {
int position = getAdapterPosition();
if (position != RecyclerView.NO_POSITION) {
mListener.onItemClick(position);
}
}
}
});}}}
my activitymain.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:background="#FFFFFF"
android:orientation="vertical"
android:padding="5dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Recommended Apps"
android:textColor="#000"
android:textStyle="bold"
android:textSize="20sp"
android:layout_marginBottom="10dp"
/>
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
android:id="#+id/refreshlayout"
android:layout_width="wrap_content"
android:layout_height="match_parent"
>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
android:padding="5dp" />
</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

Just use mExampleList.clear() at the first line of your parseJSON() function
and then you'll be able to add the "updated" items.
In addition I'd suggest that you move swipeRefreshLayout.setRefreshing(false) to the end of Volley onResponse and onError() implementation -
Right now you're telling the swipeRefreshLayout to stop refreshing before the request(that happens asynchronously) has finished

You are initializing your adapter every time you do a swipe.
Change this constructor of MyAdapter code.
public MyAdapter(Context context, ArrayList<one_item> exampleList) {
mContext = context;
mExampleList = exampleList;
}
to,
public MyAdapter(Context context) {
mContext = context;
}
public setExampleList(ArrayList<one_item> exampleList){
mExampleList = exampleList;
}
Now change your onCreate function to.
#SuppressLint("RestrictedApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportActionBar().setTitle("APK VIP CHINA");
getSupportActionBar().setDefaultDisplayHomeAsUpEnabled(true);
swipeRefreshLayout = findViewById(R.id.refreshlayout);
mRecyclerView = findViewById(R.id.recycler_view);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mExampleList = new ArrayList<>();
mRequestQueue = Volley.newRequestQueue(this);
//Changed Code
mExampleAdapter = new MyAdapter(MainActivity.this);
mRecyclerView.setAdapter(mExampleAdapter);
mExampleAdapter.setOnItemClickListener(MainActivity.this);
parseJSON();
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
parseJSON();
swipeRefreshLayout.setRefreshing(false);
}
});
}
private void parseJSON() {
String url = "http://apkvip.net/json2.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("data");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject hit = jsonArray.getJSONObject(i);
String creatorName = hit.getString("ten");
String creatorsize = hit.getString("apk_size");
String creatorfile = hit.getString("link_apk");
String imageUrl = hit.getString("link_img");
mExampleList.add(new one_item(imageUrl, creatorName, creatorsize, creatorfile));
}
//Changed Code
mExampleAdapter.setExampleList(mExampleList);
mExampleAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
mRequestQueue.add(request);
}
I have added a comment of the code block where I have made the changes.
Feel free to comment in case you have any queries.

Related

Two recyclerview is not showing in one layout

i am trying to implement two recyclerview in one layout with same adapter. but only one recyclerview is showing.
MainActivity.java
public class MainActivity extends AppCompatActivity {
List<DataAdapter> ListOfdataAdapter;
String HTTP_JSON_URL = "http://example.com";
String Image_Name_JSON = "Menu_name";
String Image_URL_JSON = "Menu_image";
JsonArrayRequest RequestOfJSonArray ;
RequestQueue requestQueue ;
View view ;
int RecyclerViewItemPosition ;
RecyclerView.LayoutManager layoutManagerOfrecyclerView;
RecyclerView.Adapter recyclerViewadapter;
ArrayList<String> ImageTitleNameArrayListForClick;
long Category_ID;
String MenuAPI;
private RecyclerView secondRecyclerView;
private RecyclerView.LayoutManager secondLayoutManager;
private RecyclerView firstrecyclerView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageTitleNameArrayListForClick = new ArrayList<>();
// menu API url
Intent iGet = getIntent();
Category_ID = iGet.getLongExtra("category_id",0);
MenuAPI += Category_ID;
ListOfdataAdapter = new ArrayList<>();
firstrecyclerView = (RecyclerView) findViewById(R.id.recyclerview1);
firstrecyclerView.setHasFixedSize(true);
layoutManagerOfrecyclerView = new LinearLayoutManager(MainActivity.this, LinearLayoutManager.HORIZONTAL, true);
firstrecyclerView.setLayoutManager(layoutManagerOfrecyclerView);
firstrecyclerView.post(new Runnable() {
#Override
public void run() {
JSON_HTTP_CALL();// a method which requests remote data
}
});
secondRecyclerView = (RecyclerView) findViewById(R.id.recyclerview2);
secondRecyclerView.setHasFixedSize(true);
secondLayoutManager = new LinearLayoutManager(MainActivity.this, LinearLayoutManager.VERTICAL, true);
secondRecyclerView.setLayoutManager(secondLayoutManager);
secondRecyclerView.post(new Runnable() {
#Override
public void run() {
JSON_HTTP_CALL2();// a method which requests remote data
}
});
// Implementing Click Listener on RecyclerView.
}
public void JSON_HTTP_CALL(){
RequestOfJSonArray = new JsonArrayRequest(HTTP_JSON_URL + "/api/example.php" +"&category_id=2",
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
ParseJSonResponse(response);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
requestQueue = Volley.newRequestQueue(MainActivity.this);
requestQueue.add(RequestOfJSonArray);
}
public void ParseJSonResponse(JSONArray array){
for(int i = 0; i<array.length(); i++) {
DataAdapter GetDataAdapter2 = new DataAdapter();
JSONObject json = null;
try {
json = array.getJSONObject(i);
GetDataAdapter2.setImageTitle2(json.getString(Image_Name_JSON));
// Adding image title name in array to display on RecyclerView click event.
ImageTitleNameArrayListForClick.add(json.getString(Image_Name_JSON));
GetDataAdapter2.setImageUrl2(HTTP_JSON_URL + "/" + json.getString(Image_URL_JSON));
} catch (JSONException e) {
e.printStackTrace();
}
ListOfdataAdapter.add(GetDataAdapter2);
}
recyclerViewadapter = new RecyclerViewAdapter(ListOfdataAdapter, getApplicationContext());
firstrecyclerView.setAdapter(recyclerViewadapter);
}
public void JSON_HTTP_CALL2(){
RequestOfJSonArray = new JsonArrayRequest(HTTP_JSON_URL + "/api/example.php" +"&category_id=2",
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
ParseJSonResponse2(response);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
requestQueue = Volley.newRequestQueue(MainActivity.this);
requestQueue.add(RequestOfJSonArray);
}
public void ParseJSonResponse2(JSONArray array){
for(int i = 0; i<array.length(); i++) {
DataAdapter GetDataAdapter2 = new DataAdapter();
JSONObject json = null;
try {
json = array.getJSONObject(i);
GetDataAdapter2.setImageTitle2(json.getString(Image_Name_JSON));
// Adding image title name in array to display on RecyclerView click event.
ImageTitleNameArrayListForClick.add(json.getString(Image_Name_JSON));
GetDataAdapter2.setImageUrl2(HTTP_JSON_URL + "/" + json.getString(Image_URL_JSON));
} catch (JSONException e) {
e.printStackTrace();
}
ListOfdataAdapter.add(GetDataAdapter2);
}
recyclerViewadapter = new RecyclerViewAdapter(ListOfdataAdapter, getApplicationContext());
secondRecyclerView.setAdapter(recyclerViewadapter);
}
}
Adapter class
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
Context context;
List<DataAdapter> dataAdapters;
ImageLoader imageLoader;
private Activity activity;
private static final int CITY_TYPE = 0;
JsonArrayRequest RequestOfJSonArray;
private static final int EVENT_TYPE = 1;
public RecyclerViewAdapter(Activity act) {
this.activity = act;
}
public RecyclerViewAdapter(List<DataAdapter> getDataAdapter, Context context){
super();
this.dataAdapters = getDataAdapter;
this.context = context;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view;
switch (viewType) {
case CITY_TYPE:
view = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardview, parent, false);
return new ViewHolder(view);
case EVENT_TYPE:
view = LayoutInflater.from(parent.getContext()).inflate(R.layout.card2, parent, false);
return new ViewHolder(view);
}
return null;
}
#Override
public void onBindViewHolder(ViewHolder Viewholder, int position) {
DataAdapter dataAdapterOBJ = dataAdapters.get(position);
imageLoader = ImageAdapter.getInstance(context).getImageLoader();
if (dataAdapterOBJ != null) {
switch (dataAdapterOBJ.getType()) {
case CITY_TYPE:
imageLoader.get(dataAdapterOBJ.getImageUrl2(),
ImageLoader.getImageListener(
Viewholder.VollyImageView,//Server Image
R.mipmap.ic_launcher,//Before loading server image the default showing image.
android.R.drawable.ic_dialog_alert //Error image if requested image dose not found on server.
)
);
Viewholder.VollyImageView.setImageUrl(dataAdapterOBJ.getImageUrl2(), imageLoader);
Viewholder.ImageTitleTextView.setText(dataAdapterOBJ.getImageTitle2());
break;
case EVENT_TYPE:
imageLoader.get(dataAdapterOBJ.getImageUrl2(),
ImageLoader.getImageListener(
Viewholder.VollyImageView,//Server Image
R.mipmap.ic_launcher,//Before loading server image the default showing image.
android.R.drawable.ic_dialog_alert //Error image if requested image dose not found on server.
)
);
Viewholder.VollyImageView.setImageUrl(dataAdapterOBJ.getImageUrl2(), imageLoader);
Viewholder.ImageTitleTextView.setText(dataAdapterOBJ.getImageTitle2());
break;
}
}
}
#Override
public int getItemCount() {
return dataAdapters.size();
}
class ViewHolder extends RecyclerView.ViewHolder{
public TextView ImageTitleTextView;
public NetworkImageView VollyImageView ;
public ViewHolder(View itemView) {
super(itemView);
ImageTitleTextView = (TextView) itemView.findViewById(R.id.MenuNameTV) ;
VollyImageView = (NetworkImageView) itemView.findViewById(R.id.VolleyImageView) ;
}
}
}
main activity xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="Most Watched"/>
<!-- A RecyclerView to display horizontal list -->
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerview1"
android:scrollbars="none"
android:layout_width="fill_parent"
android:layout_height="240dp"
android:paddingLeft="0dp"
android:paddingRight="15dp"
android:paddingTop="15dp"
android:paddingBottom="25dp"
android:background="#ffc000"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="All Dramas"/>
<!-- A RecyclerView to display vertical list -->
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerview2"
android:layout_width="fill_parent"
android:layout_height="240dp"
android:paddingLeft="0dp"
android:paddingRight="15dp"
android:paddingTop="15dp"
android:paddingBottom="25dp"/>
i try every possible way available on internet but dont get solution.
Anything wrong i am doing?
any idea how to run two recyclerview with above code.
thankx

You can do this-
<android.support.v4.widget.NestedScrollView>
<LinearLayout>
.
.
.
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
This is used to attach 2 or more scrolling views together and one more thing you can do is to make the height of recycler view as "wrap_content".
Hope this helps.

Issue in loading new Images in gridview

I'm making an app that loads the images from server in gridview. I'm using Volley for Http request, glide to download image. I can load the image when app is install and open first time, but when new images are added, it cannot load new images.
URLS
there was 7 urls when app is installed, so it loaded 7 images. but after refresh or reopen app it cannot load 8th image
{"result":[{"url":"http://smilestechno.000webhostapp.com/ImagesUpload/Desert.jpg"},{"url":"http://smilestechno.000webhostapp.com/ImagesUpload/Jellyfish.jpg"},{"url":"http://smilestechno.000webhostapp.com/ImagesUpload/child.png"},{"url":"http://smilestechno.000webhostapp.com/ImagesUpload/clamber-512.png"},{"url":"http://smilestechno.000webhostapp.com/ImagesUpload/image:52.jpg"},{"url":"http://smilestechno.000webhostapp.com/ImagesUpload/image:52.jpg"},{"url":"http://smilestechno.000webhostapp.com/ImagesUpload/Temp20181016_051043.jpg"},{"url":"http://smilestechno.000webhostapp.com/ImagesUpload/My Children20182917_022900.jpg"},{"url":"http://smilestechno.000webhostapp.com/ImagesUpload/MyChildren1412414122.jpg"}]}
Images fregment where gridview is displayed
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
// return inflater.inflate(R.layout.fragment_images, container, false);
View v = inflater.inflate(R.layout.fragment_images, container, false);
FloatingActionButton btnCamera = (FloatingActionButton) v.findViewById(R.id.btnCamera);
FloatingActionButton btnFolder = (FloatingActionButton) v.findViewById(R.id.btnFolder);
refreshMainGrid = (SwipeRefreshLayout) v.findViewById(R.id.refreshManGrid);
imgGrid = (GridView) v.findViewById(R.id.imgGrid);
getData();
imgGrid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
Intent intent = new Intent(getContext(), SingleImage.class);
intent = intent.putExtra("id", (ImageObject) myGridAdapter.getItem(position));
startActivity(intent);
}
});
refreshMainGrid.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
refreshData();
}
});
return v;
}
private void getData(){
RequestQueue queue = Volley.newRequestQueue(getContext());
StringRequest stringRequest = new StringRequest(Request.Method.GET, IMAGE_URL, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
JSONArray jsonArray = jsonObject.optJSONArray("result");
if (jsonArray != null && jsonArray.length() > 0) {
ArrayList<ImageObject> imageObjects = new ArrayList<>();
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonitem = jsonArray.optJSONObject(i);
imageObjects.add(new ImageObject(jsonitem));
}
myGridAdapter = new MyGridAdapter(getContext(), imageObjects);
getActivity().runOnUiThread(new Runnable() {
#Override
public void run() {
imgGrid.setAdapter(myGridAdapter);
}
});
}
} catch (Exception e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
stringRequest.setRetryPolicy(new DefaultRetryPolicy(6000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
queue.add(stringRequest);
}
private void refreshData(){
RequestQueue queue = Volley.newRequestQueue(getContext());
StringRequest stringRequest = new StringRequest(Request.Method.GET, IMAGE_URL, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
JSONArray jsonArray = jsonObject.optJSONArray("result");
if (jsonArray != null && jsonArray.length() > 0) {
ArrayList<ImageObject> imageObjects = new ArrayList<>();
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonitem = jsonArray.optJSONObject(i);
imageObjects.add(new ImageObject(jsonitem));
}
myGridAdapter = new MyGridAdapter(getContext(), imageObjects);
getActivity().runOnUiThread(new Runnable() {
#Override
public void run() {
imgGrid.setAdapter(myGridAdapter);
}
});
}
} catch (Exception e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
stringRequest.setRetryPolicy(new DefaultRetryPolicy(6000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
queue.add(stringRequest);
refreshMainGrid.setRefreshing(false);
}
MyGridAdapter
public class MyGridAdapter extends BaseAdapter {
private Context context;
private ArrayList<ImageObject> imageObjects;
private LayoutInflater mLayoutInflate;
public MyGridAdapter(Context context, ArrayList<ImageObject> imageObjects) {
this.context = context;
this.imageObjects = imageObjects;
this.mLayoutInflate = LayoutInflater.from(context);
}
public int getCount() {
if (imageObjects != null) return imageObjects.size();
return 0;
}
#Override
public Object getItem(int position) {
if (imageObjects != null && imageObjects.size() > position)
return imageObjects.get(position);
return null;
}
#Override
public long getItemId(int position) {
if (imageObjects != null && imageObjects.size() > position)
return imageObjects.get(position).getId();
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder = null;
if (convertView == null) {
viewHolder = new ViewHolder();
convertView = mLayoutInflate.inflate(R.layout.imageitem, parent,
false);
viewHolder.imageView = (ImageView) convertView.findViewById(R.id.image);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
ImageObject imageObject = (ImageObject) getItem(position);
if (imageObject != null) {
Glide
.with(context)
.load(imageObject.getImageUrl())
.centerCrop()
.crossFade()
.into(viewHolder.imageView);
}
return convertView;
}
}
ImageObject
public class ImageObject implements Parcelable{
private int id;
private String imageUrl;
public ImageObject(Parcel in){
id = in.readInt();
imageUrl = in.readString();
}
public ImageObject(JSONObject jsonObject){
if(jsonObject == null) return;
this.id = jsonObject.optInt("id");
this.imageUrl = jsonObject.optString("url");
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getImageUrl() {
return imageUrl;
}
public void setImageUrl(String imageUrl) {
this.imageUrl = imageUrl;
}
#Override
public int describeContents() {
return 0;
}
#Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(id);
dest.writeString(imageUrl);
}
public static final ImageObject.Creator<ImageObject> CREATOR = new ImageObject.Creator<ImageObject>(){
#Override
public ImageObject createFromParcel(Parcel in) {
return new ImageObject(in);
}
#Override
public ImageObject[] newArray(int size) {
return new ImageObject[size];
}
};
}
Even after refresh or reopen app it does not load 8th image.
one more isuue is that it loading image from bottom not from top item.
Images xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context="com.smiles.mychildren.Images"
android:orientation="vertical">
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/refreshManGrid"
android:layout_marginTop="110dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<GridView
android:id="#+id/imgGrid"
android:numColumns="auto_fit"
android:columnWidth="135dp"
android:layout_marginTop="110dp"
android:clipToPadding="false"
android:padding="0dp"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:verticalSpacing="0dp"
android:horizontalSpacing="0dp"
android:stretchMode="none"
android:stackFromBottom="false">
</GridView>
</android.support.v4.widget.SwipeRefreshLayout>

I found the solution.
The problem was with Volley cache.
stringRequest.setShouldCache(false);
By this we can stop saving cache.

Volley, SwipeToRefresh and notifyDataSetChanged() not working

I fetch the data from my Server with Volley and put the data inside a GridView.
Now when I use swipeToRefresh, it should load the new/changed data. For this I tried everything but nothing worked.
First my code:
MainActivity.java
public class MainActivity extends AppCompatActivity {
List<getter_setter> list = new ArrayList<>();
grid_adapter grid_adapter;
GridView gridView;
SwipeRefreshLayout swipeRefreshLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
swipeRefreshLayout = findViewById(R.id.swipeRefresh);
getData();
gridView = findViewById(R.id.gridView);
grid_adapter = new grid_adapter(getApplicationContext(),list);
gridView.setAdapter(grid_adapter);
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
getData();
grid_adapter.update(list);
swipeRefreshLayout.setRefreshing(false);
}
});
}
public void getData(){
final String url = "http://*.**.***.***/";
final RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, url, null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray jsonArray = response.getJSONArray("userdata");
for(int i = 0; i < jsonArray.length(); i++){
JSONObject jsonObject = jsonArray.getJSONObject(i);
String NAME = jsonObject.getString("NAME");
String BILD = jsonObject.getString("VORSCHAUBILD");
getter_setter getter_setter = new getter_setter(NAME,"",BILD);
list.add(getter_setter);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
requestQueue.add(jsonObjectRequest);
}
}
And the BaseAdapter
public class grid_adapter extends BaseAdapter{
Context context;
List<getter_setter> list;
public grid_adapter(Context context, List<getter_setter> list) {
this.context = context;
this.list = list;
}
#Override
public int getCount() {
return list.size();
}
#Override
public Object getItem(int i) {
return list.get(i);
}
#Override
public long getItemId(int i) {
return 0;
}
public void update(List<getter_setter> listUpdate){
this.list.addAll(listUpdate);
notifyDataSetChanged();
}
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
View gridView = view;
if(view == null){
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
gridView = inflater.inflate(R.layout.grid_design,null);
}
final getter_setter getter = list.get(i);
TextView name = gridView.findViewById(R.id.NAME);
final ImageView bild = gridView.findViewById(R.id.bild);
name.setText(getter.getNAME());
Picasso.with(context).load(getter.getVORSCHAUBILD()).into(bild);
return gridView;
}
}

Check The Updated Listener
Explanation-:
Since You Are Passing Reference Of Your List Into RecyclerView Hence Updating List In The Activity Will Update The List In Adapter Automatically
No Need To Call update Method
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
list.clear(); // Clean The List Before Adding Updated Data
grid_adapter.notifyDataSetChanged();
getData();
grid_adapter.notifyDataSetChanged();
swipeRefreshLayout.setRefreshing(false);
}
});

ArrayList not being displayed in RecyclerView

I'm trying to display an ArrayList of Integers inside of a RecyclerView, the Integer values in the ArrayList are downloaded from JSON, all that is done, the thing I need help with is to display them in a RecyclerView.
This is my code so far but the RecyclerView does not display anything.
All code updated to my current code
Here's part of the MainActivity:
public class MainActivity extends AppCompatActivity {
private ActivityMainViewModel viewmodel;
RecyclerView recyclerView;
MainAdapter mAdapter;
public static ArrayList<Integer> rideList = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
viewmodel = new ActivityMainViewModel();
binding.setViewmodel(viewmodel);
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
mAdapter = new MainAdapter(rideList);
recyclerView.setAdapter(mAdapter);
}
Here's the MainAdapter class:
class MainAdapter extends android.support.v7.widget.RecyclerView.Adapter<MainAdapter.ViewHolder> {
private ArrayList<Integer> rideList;
public MainAdapter(ArrayList<Integer> rideList)
{
this.rideList = rideList;
}
#Override
public MainAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(MainAdapter.ViewHolder holder, int position)
{
holder.rideHeight.setText(String.valueOf(rideList.get(position)));
}
#Override
public int getItemCount()
{
return rideList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView rideHeight;
public ViewHolder(View itemView) {
super(itemView);
rideHeight = (TextView) itemView.findViewById(R.id.rideHeight_textView);
}
}
}
row.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/rideHeight_textView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"/>
</LinearLayout>
I know that it probably looks a mess but that's because I have been searching both on google and youtube on how to use RecyclerView so I might have mixed from different tutorials and tried somethings myself.
Thanks!
Edit: JsonData code added on request:
JsonData:
public class JsonData
{
public ObservableField<String> dropHeight = new ObservableField<>();
public ObservableField<String> rideCount = new ObservableField<>();
int eID;
int sID;
public JsonData()
{
dropHeight.set("");
rideCount.set("");
}
public void downloadFromSkistar()
{
if (SettingsActivity.submitClicked)
{
eID = SettingsActivity.x;
sID = SettingsActivity.y;
}
else
{
eID = 3206;
sID = 11;
}
try
{
URL url = new URL("https://www.skistar.com/myskistar/api/v2/views/statisticspage.json?entityId=" + eID + "&seasonId=" + sID + " ");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("GET");
// Starts the query
conn.connect();
int response = conn.getResponseCode();
Log.i("AndroidExample", "Response: " + response);
if (response == 200)
{
String json = getJson(conn.getInputStream());
JSONObject jsonObject = new JSONObject(json);
JSONArray jsonArray = jsonObject.getJSONArray("rideStatistics");
int reponame = 0;
int rHeight = 0;
for (int i = 0; i < jsonArray.length(); i++)
{
JSONObject skiRun = jsonArray.getJSONObject(i);
reponame += skiRun.getInt("height");
rHeight += skiRun.getInt("height");
MainActivity.rideList.add(new Integer(rHeight));
rHeight = 0;
}
final int height = reponame;
final int count = jsonArray.length();
new Handler(Looper.getMainLooper()).post(new Runnable() {
#Override
public void run() {
dropHeight.set("" + height);
rideCount.set("" + count);
}
});
}
}
catch (Exception e)
{
Log.i("AndroidExample", "Error");
}
finally
{
}
}
private String getJson(InputStream stream) throws IOException
{
BufferedReader reader;
reader = new BufferedReader(new InputStreamReader(stream, "UTF-8"));
StringBuilder builder = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
builder.append(line + '\n');
}
//Should be placed in finally
stream.close();
return builder.toString();
}
}

You can use like..
Model..to set value and get value
public class CustomModel {
private int it;
public int getIt() {
return it;
}
public void setIt(int it) {
this.it = it;
}
}
Adapter ...
private class MainAdapter extends RecyclerView.Adapter<MainAdapter.ViewHolder>{
public MainAdapter(ArrayList<CustomModel> list){
dataSet = list;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View itemLayoutView = LayoutInflater.from(viewGroup.getContext()).inflate(
R.layout.row, null);
itemLayoutView.setLayoutParams(new RecyclerView.LayoutParams(RecyclerView.LayoutParams.MATCH_PARENT, RecyclerView.LayoutParams.WRAP_CONTENT));
MainAdapter.ViewHolder viewHolder = new MainAdapter.ViewHolder(itemLayoutView);
return viewHolder;
}
#Override
public void onBindViewHolder(ViewHolder viewHolder, int position) {
CustomModel cardModel = dataSet.get(position);
viewHolder.rideHeight_textView.setText(String.valueOf(cardModel.getId()));
}
#Override
public int getItemCount() {
return dataSet.size();
}
public void updateList(List<CustomModel> temp) {
dataSet = (ArrayList<CustomModel>) temp;
notifyDataSetChanged();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView rideHeight_textView;
public ViewHolder(View itemLayoutView) {
super(itemLayoutView);
rideHeight_textView = (TextView) itemLayoutView .findViewById(R.id.rideHeight_textView);
itemLayoutView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//action ****
}
});
}
}
}
Just call like
ArrayList<CustomModel> menuList = new ArrayList<>();
CustomModel c = new CustomModel();
c.setIt(1);
recyclerView.setHasFixedSize(true);
// ListView
recyclerView.setLayoutManager(new LinearLayoutManager(Your activity.this));
// create an Object for Adapter
MainAdapter mAdapter = new MainAdapter(menuList);
// set the adapter object to the Recyclerview
recyclerView.setAdapter(mAdapter);
row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:background="#ffffff"
android:padding="#dimen/activity_vertical_margin"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/rideHeight_textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#000000"
android:textSize="20sp"/>
</LinearLayout>

recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
LinearLayoutManager layoutManager = new LinearLayoutManager(context);
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(layoutManager);
mAdapter = new MainAdapter(JsonData.rideList, MainActivity.this);
recyclerView.setAdapter(mAdapter);
mAdapter.notifyDataSetChanged();
adapter:
class MainAdapter extends android.support.v7.widget.RecyclerView.Adapter<MainAdapter.ViewHolder> {
private ArrayList<Integer> rideList = new ArrayList<>();
private Context context;
public MainAdapter(ArrayList<Integer> rideList, Context context)
{
this.context = context;
this.rideList = rideList;
}
#Override
public MainAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
View view = LayoutInflater.from(context).inflate(R.layout.row, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(MainAdapter.ViewHolder holder, int position)
{
holder.rideHeight.setText(String.valueOf(rideList.get(position)));
}
#Override
public int getItemCount()
{
return rideList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView rideHeight;
public ViewHolder(View itemView) {
super(itemView);
rideHeight = (TextView) itemView.findViewById(R.id.rideHeight_textView);
}
}
}
row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:background="#ffffff"
android:padding="#dimen/activity_vertical_margin"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/rideHeight_textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#000000"
android:textSize="20sp"/>
</LinearLayout>

For starters you are not calling your data fetcher method in JsonData class. Your code is kind of messy so you can try the following solution:
In your adapter class add this method:
public void setList(ArrayList<Integer> rideList)
{
this.rideList = rideList;
notifyDataSetChanged();
}
Then in you JsonData class add:
private MainAdapter adapter;
public JsonData(MainAdapter adapter)
{
this.adapter = adapter;
dropHeight.set("");
rideCount.set("");
}
And change downloadFromSkistar to:
public void downloadFromSkistar()
{
if (SettingsActivity.submitClicked)
{
eID = SettingsActivity.x;
sID = SettingsActivity.y;
}
else
{
eID = 3206;
sID = 11;
}
new AsyncTask<Void, Void, List<Integer>>() {
#Override
protected List<Integer> doInBackground(Void... voids) {
try
{
URL url = new
URL("https://www.skistar.com/myskistar/api/v2/views/statisticspage.json?
entityId=" + eID + "&seasonId=" + sID + " ");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("GET");
// Starts the query
conn.connect();
int response = conn.getResponseCode();
Log.i("AndroidExample", "Response: " + response);
if (response == 200)
{
String json = getJson(conn.getInputStream());
JSONObject jsonObject = new JSONObject(json);
JSONArray jsonArray = jsonObject.getJSONArray("rideStatistics");
int reponame = 0;
int rHeight = 0;
for (int i = 0; i < jsonArray.length(); i++)
{
JSONObject skiRun = jsonArray.getJSONObject(i);
reponame += skiRun.getInt("height");
rHeight += skiRun.getInt("height");
rideList.add(new Integer(rHeight));
rHeight = 0;
}
}
}
catch (Exception e)
{
Log.i("AndroidExample", "Error");
}
finally
{
}
return rideList;
}
#Override
protected void onPostExecute(List<Integer> list)
{
super.onPostExecute(list);
adapter.setList(rideList);
}
};
}
And in the end finally change MainActivity to:
public class MainActivity extends AppCompatActivity {
private ActivityMainViewModel viewmodel;
RecyclerView recyclerView;
MainAdapter mAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
viewmodel = new ActivityMainViewModel();
binding.setViewmodel(viewmodel);
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
mAdapter = new MainAdapter(JsonData.rideList);
recyclerView.setAdapter(mAdapter);
new JsonData(mAdapter).downloadFromSkistar();
}
PS: You are going to get NetworkOnMainThread exception. So try to add the network code in AsyncTask

Here's what I did to solve it, and btw I'm also using the SwipeRefreshLayout.
public class MainActivity extends AppCompatActivity {
private ActivityMainViewModel viewmodel;
RecyclerView recyclerView;
MainAdapter mAdapter;
public static ArrayList<Integer> rideList = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
viewmodel = new ActivityMainViewModel();
binding.setViewmodel(viewmodel);
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
mAdapter = new MainAdapter(rideList);
recyclerView.setAdapter(mAdapter);
viewmodel.jdDownloadFromSkistar();
final SwipeRefreshLayout swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipelayout);;
swipeRefreshLayout.setColorSchemeResources(R.color.refresh,R.color.refresh1,R.color.refresh2);
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
swipeRefreshLayout.setRefreshing(true);
refreshRecyclerView();
swipeRefreshLayout.setRefreshing(false);
}
});
}
private void refreshRecyclerView()
{
mAdapter.notifyDataSetChanged();
}
So what I did was make a call to the jdDownloadFromSkistar(); Method and when I swipe to refresh it updates the adapter by using the notifyDataSetChanged(); method.

error when i display my data in recycler view :RecyclerView: No adapter attached; skipping layout

I'm traying to get data from my mysql database and display them in a list view but the probleme is that the list view show only one attribut and for the others i have an error:RecyclerView: No adapter attached; skipping layout
this is my adapter :
public class DerpAdapter extends RecyclerView.Adapter<DerpAdapter.DerpHolder>{
private List<ListItem> ListData;
private LayoutInflater inflater;
private ItemClickCallback itemClickCallback;
public interface ItemClickCallback{
void onItemClick(int p);
void onSecondaryIconClick(int p);
}
public void setItemClickCallback(final ItemClickCallback itemClickCallback){
this.itemClickCallback = itemClickCallback;
}
public DerpAdapter(List<ListItem> listData, Context c){
this.inflater = LayoutInflater.from(c);
this.ListData = listData;
}
#Override
public DerpHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.custom_row,parent,false);
return new DerpHolder(view);
}
#Override
public void onBindViewHolder(DerpHolder holder, int position) {
ListItem item = ListData.get(position);
holder.title.setText(item.getTitle());
holder.subtitle.setText(item.getSubtitle());
holder.gaga.setText(item.getGaga());
}
#Override
public int getItemCount() {
return ListData.size();
}
class DerpHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
private TextView title;
private TextView subtitle;
private TextView gaga;
public DerpHolder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.lbl_item_text);
subtitle = (TextView) itemView.findViewById(R.id.lbl_item_sub_title);
gaga = (TextView) itemView.findViewById(R.id.gaga);
}
#Override
public void onClick(View view) {
/* if(view.getId() == R.id.cont_item_root){
}else{
}*/
}
}
this is my list item:
public class ListItem {
private String title;
private String subtitle;
private String gaga;
public String getGaga() {
return gaga;
}
public void setGaga(String gaga) {
this.gaga = gaga;
}
public ListItem(String title, String subtitle, String gaga) {
this.title = title;
this.subtitle = subtitle;
this.gaga = gaga;
}
public void setSubtitle(String subtitle) {
this.subtitle = subtitle;
}
public String getSubtitle() {
return subtitle;
}
public void setTitle(String title) {
this.title = title;
}
public String getTitle() {
return title;
}
and finally this is my mainActivity:
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private DerpAdapter adapter;
private final String url_Data = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
List<ListItem> data ;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.drawarlist);
//Layout Manager: GridLayoutManager or StaggerdeGridLayoutManager
recyclerView.setLayoutManager(new LinearLayoutManager(this));
//adapter = new DerpAdapter(DerpData.getListData(), this);
recyclerView.setAdapter(adapter);
loadData();
}
public void loadData(){
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Loading Data");
progressDialog.show();
StringRequest stringRequest = new StringRequest(Request.Method.GET, url_Data,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
progressDialog.dismiss();
try {
JSONObject jsonObject = new JSONObject(response);
JSONArray array = jsonObject.getJSONArray("soucat");
data = new ArrayList<>();
for (int i = 0; i < array.length(); i++){
JSONObject o = array.getJSONObject(i);
ListItem item = new ListItem(o.getString("soucat"),"hello","fefe");
data.add(item);
}
adapter = new DerpAdapter(data,getApplicationContext());
recyclerView.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}

First, your initial setting of the adapter variable is commented out:
//adapter = new DerpAdapter(DerpData.getListData(), this);
recyclerView.setAdapter(adapter);
This will always set the adapter to null, you need to change it to this:
adapter = new DerpAdapter(DerpData.getListData(), this);
recyclerView.setAdapter(adapter);
Also, I don't see a call to start the Volley RequestQueue, make sure you are calling requestQueue.start(); before adding the stringRequest.
Then verify that that code for setting the adapter is being executed. You may always be hitting the ErrorListener which never sets the adapter.

You are trying to set null reference adapter to the RecyclerView, firstly you initialize adapter then set into the RecyclerView.

#Bobbake4 this is the code:
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private DerpAdapter adapter;
private final String url_Data = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
List<ListItem> data ;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.drawarlist);
//Layout Manager: GridLayoutManager or StaggerdeGridLayoutManager
recyclerView.setLayoutManager(new LinearLayoutManager(this));
adapter = new DerpAdapter(DerpData.getListData(), this);
recyclerView.setAdapter(adapter);
loadData();
}
public void loadData(){
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Loading Data");
progressDialog.show();
StringRequest stringRequest = new StringRequest(Request.Method.GET, url_Data,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
progressDialog.dismiss();
try {
JSONObject jsonObject = new JSONObject(response);
JSONArray array = jsonObject.getJSONArray("soucat");
data = new ArrayList<>();
for (int i = 0; i < array.length(); i++){
JSONObject o = array.getJSONObject(i);
ListItem item = new ListItem(o.getString("soucat"),"hello","fefe");
data.add(item);
}
adapter = new DerpAdapter(data,getApplicationContext());
recyclerView.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.start();
requestQueue.add(stringRequest);
}

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

swipe to refresh recyclerview duplicate item json - android

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ArrayList not being displayed in RecyclerView

error when i display my data in recycler view :RecyclerView: No adapter attached; skipping layout

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