Develop Reference

Listener from DialogFragment to Fragment

I'm a beginner in Java and I'm trying to create a listener in my DialogFragment to notice my fragment that some book was removed. When the user removes a book, I want to call the removeBook method in BookFragment and update the recyclerview.
Here is my BookDialogFragment.java:
package com.compose.dietapp.ui.books;
import android.app.Dialog;
import android.content.DialogInterface;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AlertDialog;
import androidx.fragment.app.DialogFragment;
import java.util.Objects;
public class BookDialogFragment extends DialogFragment {
private final String nameToDelete;
private final int position;
private static String MESSAGE_TO_DIALOG_FRAGMENT;
public BookDialogFragment(String nameToDelete, int position) {
this.nameToDelete = nameToDelete;
this.position = position;
}
public static BookDialogFragment newInstance(String title, String nameToDelete, int position) {
BookDialogFragment frag = new BookDialogFragment(nameToDelete, position);
if (Objects.equals(nameToDelete, "none")) {
MESSAGE_TO_DIALOG_FRAGMENT = "Book removed!";
} else {
MESSAGE_TO_DIALOG_FRAGMENT = "Are you sure you want to remove the book '"
+ nameToDelete
+ "'?";
}
Bundle args = new Bundle();
args.putString("title", title);
frag.setArguments(args);
return frag;
}
#NonNull
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
assert getArguments() != null;
String title = getArguments().getString("title");
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
alertDialogBuilder.setTitle(title);
alertDialogBuilder.setMessage(MESSAGE_TO_DIALOG_FRAGMENT);
if (Objects.equals(MESSAGE_TO_DIALOG_FRAGMENT, "Book removed!")) {
alertDialogBuilder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
if (dialog != null) {
dialog.dismiss();
}
}
});
} else {
alertDialogBuilder.setPositiveButton("Remove", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
// here I want to callback my fragment
BookFragment deleteBook = new BookFragment();
deleteBook.removeBook(nameToDelete, position);
Bundle result = new Bundle();
result.putBoolean("value", true);
getParentFragmentManager().setFragmentResult("removed", result);
}
});
alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
if (dialog != null) {
dialog.dismiss();
}
}
});
}
return alertDialogBuilder.create();
}
#Override
public void onStart() {
super.onStart();
((AlertDialog) Objects.requireNonNull(getDialog())).getButton(AlertDialog.BUTTON_NEGATIVE)
.setTextColor(Color.rgb(128, 128, 128));
}
}
And here is my BookFragment.java:
package com.compose.dietapp.ui.books;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.compose.dietapp.R;
import com.compose.dietapp.database.DatabaseAccess;
import com.compose.dietapp.databinding.FragmentBookBinding;
import java.util.ArrayList;
public class BookFragment extends Fragment{
#SuppressLint("StaticFieldLeak")
private static Activity activity;
private RecyclerView recyclerView;
private final ArrayList<Book> itensBook = new ArrayList<Book>();
private BookAdapter bookAdapter;
public View onCreateView(#NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
activity = this.getActivity();
View v = inflater.inflate(R.layout.fragment_book, container, false);
recyclerView = (RecyclerView) v.findViewById(R.id.book_recycler);
instanciateBooks();
return v;
}
private void instanciateBooks() {
ArrayList<ArrayList<String>> bookDatabaseValues = getDatabaseData();
if (recyclerView != null && bookDatabaseValues != null) {
createItemBook(bookDatabaseValues);
createRecyclerViewBook();
}
}
public void removeBook(String nameToDelete, int position) {
getChildFragmentManager().setFragmentResultListener("removed",
this, new FragmentResultListener() {
#Override
public void onFragmentResult(#NonNull String requestKey, #NonNull Bundle bundle) {
String result = bundle.getString("value");
Log.i("result", result);
}
});
}
private void createRecyclerViewBook() {
recyclerView.setHasFixedSize(true);
bookAdapter = new BookAdapter(activity, itensBook);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(activity,
LinearLayoutManager.VERTICAL, false);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(bookAdapter);
}
private void createItemBook(ArrayList<ArrayList<String>> bookDatabaseValues) {
for (int i = 0; i < bookDatabaseValues.size(); i++) {
itensBook.add(new Book(
String.valueOf(bookDatabaseValues.get(i).get(0)),
String.valueOf(bookDatabaseValues.get(i).get(1)),
String.valueOf(bookDatabaseValues.get(i).get(2)),
String.valueOf(bookDatabaseValues.get(i).get(3)),
String.valueOf(bookDatabaseValues.get(i).get(4))
));
}
}
public static ArrayList<ArrayList<String>> getDatabaseData() {
if (activity != null) {
return getArrayListsFromDatabase();
}
return null;
}
private static ArrayList<ArrayList<String>> getArrayListsFromDatabase() {
DatabaseAccess databaseAccess = openDatabase();
ArrayList<ArrayList<String>> books = databaseAccess.getBook();
closeDatabase(databaseAccess);
return books;
}
private static void closeDatabase(DatabaseAccess databaseAccess) {
databaseAccess.close();
}
#NonNull
private static DatabaseAccess openDatabase() {
DatabaseAccess databaseAccess = DatabaseAccess.getInstance(activity);
databaseAccess.open();
return databaseAccess;
}
}
Here is my BookAdapter.java:
package com.compose.dietapp.ui.books;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentManager;
import androidx.recyclerview.widget.RecyclerView;
import com.compose.dietapp.R;
import java.io.InputStream;
import java.util.ArrayList;
public class BookAdapter extends RecyclerView.Adapter<BookViewHolder> {
public static FragmentManager supportFragment;
private final Context context;
private final ArrayList<Book> itens;
public BookAdapter(Context context, ArrayList<Book> itens) {
this.context = context;
this.itens = itens;
}
#NonNull
#Override
public BookViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.item_recycler_book, parent, false);
BookViewHolder viewHolder = new BookViewHolder(view);
supportFragment = ((AppCompatActivity)context).getSupportFragmentManager();
return viewHolder;
}
#Override
public void onBindViewHolder(#NonNull BookViewHolder bookViewHolder, int position) {
Book book = itens.get(position);
bookViewHolder.nome.setText(book.getName());
bookViewHolder.bookType.setText(book.getBookType());
imageInstanciate(bookViewHolder);
}
private void imageInstanciate(#NonNull BookViewHolder bookViewHolder) {
new DownloadImageFromInternet((ImageView) bookViewHolder.bookImage)
.execute("https://pbs.twimg.com/profile_images/630285593268752384/iD1MkFQ0.png");
}
private class DownloadImageFromInternet extends AsyncTask<String, Void, Bitmap> {
ImageView imageView;
public DownloadImageFromInternet(ImageView imageView) {
this.imageView = imageView;
}
protected Bitmap doInBackground(String... urls) {
String imageURL = urls[0];
Bitmap bimage = null;
try {
InputStream in = new java.net.URL(imageURL).openStream();
bimage = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error Message", e.getMessage());
e.printStackTrace();
}
return bimage;
}
protected void onPostExecute(Bitmap result) {
imageView.setImageBitmap(result);
}
}
#Override
public int getItemCount() {
return itens.size();
}
}
Here is my BookViewHolder.java:
package com.compose.dietapp.ui.books;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.fragment.app.FragmentManager;
import androidx.recyclerview.widget.RecyclerView;
import com.compose.dietapp.R;
public class BookViewHolder extends RecyclerView.ViewHolder {
TextView nome;
TextView bookType;
ImageView bookImage;
public BookViewHolder(#NonNull View itemView) {
super(itemView);
nome = itemView.findViewById(R.id.nome);
bookType = itemView.findViewById(R.id.email);
bookImage = itemView.findViewById(R.id.book_image);
itemView.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(View view) {
int position = getLayoutPosition();
return true;
}
});
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String nomeDelete = nome.getText().toString();
int position = getLayoutPosition();
FragmentManager fm = BookAdapter.supportFragment;
BookDialogFragment bookDialogFragment =
BookDialogFragment.newInstance("Atenção:", nomeDelete, position);
bookDialogFragment.show(fm, "fragment_alert");
}
});
}
}
I've seen other similar solutions, but I didn't get to implement them in my code. Can anyone help me?

Going through your code, it doesn't seem like you're using Navigation Component. So let's do it this way.
Your BookDialogFragment is a child fragment to BookFragment. So basically, you should set a result in your dialog when remove button is clicked. Then set up a result listener code in you parent fragment (BookFragment), so as to get immediate result to act upon.
First part, set a result when remove is clicked
NonNull
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
...
if (Objects.equals(MESSAGE_TO_DIALOG_FRAGMENT, "Book removed!")) {
...
} else {
alertDialogBuilder.setPositiveButton("Remove", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
// here I want to callback my fragment
BookFragment deleteBook = new BookFragment();
deleteBook.removeBook(nameToDelete, position);
Bundle result = new Bundle();
result.putBoolean("value", true);
getParentFragmentManager().setFragmentResult("removed", result);
}
});
alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
...
}
}
}
Then, listen for and act on the result in you BookFragment, wherever you want to, with these lines.
getChildFragmentManager().setFragmentResultListener("removed", this, new FragmentResultListener() {
#Override
public void onFragmentResult(#NonNull String requestKey, #NonNull Bundle bundle) {
// We use a Boolean here, but any type that can be put in a Bundle is supported
Boolean result = bundle.getString("value");
// Do something with the result
}
});
PS: You can use constant variables where you have "removed" and "value" for accuracy.
Hope this helps :)

The Recyclerview is not showing the list

I'm trying to fetch data from an API and show the data into a recycler view. That API Contains an image URL and id. And I want to show the image from the URL and the id in the recycler view. But when I go to the Activity the recycler view is not showing the list. It is fetching the data from the API very well but it is not showing the data in the Recyclerview in a list format.
RecyclerviewAdapter.java
package com.madhulata.shriresume.shared;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.recyclerview.widget.RecyclerView;
import com.bumptech.glide.Glide;
import com.madhulata.shriresume.R;
import java.util.ArrayList;
public class RecyclerviewAdapter extends RecyclerView.Adapter<RecyclerviewAdapter.ViewHolder>{
private ArrayList<String> mImageNames;
private ArrayList<String> mId;
private Context mContext;
public RecyclerviewAdapter(ArrayList<String> mImageNames, ArrayList<String> mId, Context mContext) {
this.mImageNames = mImageNames;
this.mId = mId;
this.mContext = mContext;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.resume_format,parent,false);
ViewHolder holder = new ViewHolder(view);
return holder;
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, final int position) {
Log.d("Recycler","on Bind Called");
Glide.with(mContext)
.asBitmap()
.load(mImageNames.get(position))
.into(holder.resumeImage);
holder.resumeId.setText(mId.get(position));
holder.constraintLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(mContext, mImageNames.get(position), Toast.LENGTH_SHORT).show();
}
});
}
#Override
public int getItemCount() {
return mImageNames.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
ImageView resumeImage;
TextView resumeId;
ConstraintLayout constraintLayout;
public ViewHolder(#NonNull View itemView) {
super(itemView);
resumeImage = itemView.findViewById(R.id.resumeLogo);
resumeId = itemView.findViewById(R.id.resumeId);
constraintLayout = itemView.findViewById(R.id.resumeTypeLayout);
}
}
}
***********************************SelectResume.java********************
package com.madhulata.shriresume.activity_dir;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.Toast;
import com.madhulata.shriresume.R;
import com.madhulata.shriresume.models.ResumeType;
import com.madhulata.shriresume.shared.RecyclerviewAdapter;
import com.madhulata.shriresume.shared.RetrofitClient;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class SelectResume extends AppCompatActivity {
RecyclerView selectResumeList;
private static final String TAG = "SignupActivity";
private ArrayList<String> mId;
private ArrayList<String> mUrls;
ProgressBar p;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_select_resume);
mId = new ArrayList<>();
mUrls = new ArrayList<>();
selectResumeList = findViewById(R.id.selectResumeList);
getResume();
}
private void initRecyclerView(){
Log.i("Value","init Recycler View");
RecyclerviewAdapter adapter = new RecyclerviewAdapter(mUrls,mId,this);
selectResumeList.setAdapter(adapter);
selectResumeList.setLayoutManager(new LinearLayoutManager(this));
}
private void getResume(){
Log.i("Value","Call method");
Call<List<ResumeType>> call = RetrofitClient.getInstance().getApi().getResume();
call.enqueue(new Callback<List<ResumeType>>() {
#Override
public void onResponse(Call<List<ResumeType>> call, Response<List<ResumeType>> response) {
if (!response.isSuccessful()){
Toast.makeText(SelectResume.this, response.code(), Toast.LENGTH_SHORT).show();
}else{
List<ResumeType> resume = response.body();
for (ResumeType r : resume){
mUrls.add(r.getUrl());
mId.add(r.getId());
Log.i("Value", mId.toString());
}
}
Log.i("Value","Call method 3");
}
#Override
public void onFailure(Call<List<ResumeType>> call, Throwable t) {
Toast.makeText(SelectResume.this, "Something went wrong!", Toast.LENGTH_SHORT).show();
}
});
initRecyclerView();
}
}

Why it is not showing?
Your initRecyclerView(); called before you update your data from the services. Retrofit callback works in a separate thread.
Try this instead of your method
private void getResume(){
Log.i("Value","Call method");
Call<List<ResumeType>> call = RetrofitClient.getInstance().getApi().getResume();
call.enqueue(new Callback<List<ResumeType>>() {
#Override
public void onResponse(Call<List<ResumeType>> call, Response<List<ResumeType>> response) {
if (!response.isSuccessful()){
Toast.makeText(SelectResume.this, response.code(), Toast.LENGTH_SHORT).show();
}else{
List<ResumeType> resume = response.body();
for (ResumeType r : resume){
mUrls.add(r.getUrl());
mId.add(r.getId());
Log.i("Value", mId.toString());
}
initRecyclerView();
}
Log.i("Value","Call method 3");
}
#Override
public void onFailure(Call<List<ResumeType>> call, Throwable t) {
Toast.makeText(SelectResume.this, "Something went wrong!", Toast.LENGTH_SHORT).show();
}
});
}

You can set adapter once at start in onCreate() even if your data is empty. You can add data later and call notifyDataSetChanged() on the adapter. The RecyclerView will be updated accordingly. This will save you from the overhead of setting adapter to RecyclerView each time you get some data.
public class SelectResume extends AppCompatActivity {
RecyclerView selectResumeList;
private static final String TAG = "SignupActivity";
private ArrayList<String> mId;
private ArrayList<String> mUrls;
ProgressBar p;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_select_resume);
mId = new ArrayList<>();
mUrls = new ArrayList<>();
selectResumeList = findViewById(R.id.selectResumeList);
initRecyclerView();
getResume();
}
private void initRecyclerView(){
Log.i("Value","init Recycler View");
RecyclerviewAdapter adapter = new RecyclerviewAdapter(mUrls, mId, this);
selectResumeList.setAdapter(adapter);
selectResumeList.setLayoutManager(new LinearLayoutManager(this));
}
private void getResume(){
Log.i("Value","Call method");
Call<List<ResumeType>> call = RetrofitClient.getInstance().getApi().getResume();
call.enqueue(new Callback<List<ResumeType>>() {
#Override
public void onResponse(Call<List<ResumeType>> call, Response<List<ResumeType>> response) {
if (!response.isSuccessful()) {
Toast.makeText(SelectResume.this, response.code(), Toast.LENGTH_SHORT).show();
} else {
List<ResumeType> resume = response.body();
for (ResumeType r : resume){
mUrls.add(r.getUrl());
mId.add(r.getId());
Log.i("Value", mId.toString());
}
adapter.notifyDataSetChanged();
}
Log.i("Value","Call method 3");
}
#Override
public void onFailure(Call<List<ResumeType>> call, Throwable t) {
Toast.makeText(SelectResume.this, "Something went wrong!", Toast.LENGTH_SHORT).show();
}
});
}
}

You receive the objects to show into RecyclerView from async network call. You need to update the adapter on the callback of your network call. Moreover I advice to initialize the adapter with empty list on the activity created, and after when you receive your data update the list with notifyDataSetChanged()
https://developer.android.com/reference/android/support/v7/widget/RecyclerView.Adapter.html#notifyDataSetChanged()

Get an error : com.android.volley.ParseError: org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONArray

I try to get data from the database via API but the recyclerview doesn't display anything and the log displays an error.
This is my code
Fragment
package com.example.hp.retailmakanan;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.BottomNavigationView;
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.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.Volley;
import com.example.hp.retailmakanan.Model.MenuModel;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class FragHome extends Fragment {
RecyclerView recV;
BottomNavigationView top_navigation;
HomeAdapter listAdapter;
List<MenuModel> listMenu= new ArrayList<>();
private BottomNavigationView.OnNavigationItemSelectedListener onNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem menuItem) {
Fragment sfragment = null;
switch (menuItem.getItemId()) {
case R.id.nav_noodle:
recV.setAdapter(listAdapter);
break;
case R.id.nav_beverage:
recV.setAdapter(listAdapter);
break;
case R.id.nav_toping:
recV.setAdapter(listAdapter);
break;
case R.id.nav_cari:
recV.setAdapter(listAdapter);
break;
}
return false;
}
};
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.act_home, container, false);
recV = (RecyclerView) v.findViewById(R.id.rec_ramen);
getData();
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
recV.setLayoutManager(layoutManager);
listAdapter = new HomeAdapter(listMenu, getActivity());
recV.setAdapter(listAdapter);
top_navigation = (BottomNavigationView) v.findViewById(R.id.top_nav);
top_navigation.setOnNavigationItemSelectedListener(onNavigationItemSelectedListener);
return v;
}
this is the code that i used to get data
private void getData() {
String url ="https://waggish-requisition.000webhostapp.com/GetAllMenu.php";
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(url, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
listMenu.clear();
for (int i = 0; i < response.length(); i++) {
try {
Log.d("menu",response.toString());
JSONObject jsonObject = response.getJSONObject(i);
String id_menu = jsonObject.getString("id");
String nama_menu = jsonObject.getString("nama_menu");
String deskripsi = jsonObject.getString("deskripsi");
int harga = jsonObject.getInt("harga");
MenuModel menus = new MenuModel(id_menu,nama_menu,deskripsi,harga);
listMenu.add(menus);
System.out.println(menus);
//Toast.makeText(this,"Download data "+i,Toast.LENGTH_SHORT).show();
} catch (JSONException e) {
e.printStackTrace();
Log.d("menu",e.toString());
}
listAdapter.notifyDataSetChanged();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e("Volley", error.toString());
}
});
RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
requestQueue.add(jsonArrayRequest);
}
}
Adapter
package com.example.hp.retailmakanan;
import android.content.Context;
import android.provider.ContactsContract;
import android.support.annotation.NonNull;
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.Button;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.hp.retailmakanan.Model.MenuModel;
import java.util.Arrays;
import java.util.List;
public class HomeAdapter extends RecyclerView.Adapter {
private List<MenuModel> menus;
private Context context;
public HomeAdapter(List<MenuModel> menus, Context context) {
this.context = context;
this.menus = menus;
//System.out.println(menus);
}
#NonNull
#Override
public RecyclerView.ViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.recv_desain, viewGroup, false);
return new ListViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull RecyclerView.ViewHolder viewHolder, int pos) {
}
#Override
public int getItemCount() {
return menus.size();
}
public class ListViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
TextView mText,txt2, txt3, txtQty;
ImageView img;
Button btnMin, btnPlus;
int x;
public ListViewHolder(View itemView){
super(itemView);
mText = itemView.findViewById(R.id.text_item);
txt2 = itemView.findViewById(R.id.text_item2);
txt3 = itemView.findViewById(R.id.textView3);
img = itemView.findViewById(R.id.image_item);
btnMin = itemView.findViewById(R.id.buttonMinMenu);
btnPlus = itemView.findViewById(R.id.buttonPlusMenu);
txtQty = itemView.findViewById(R.id.textQtyMenu);
itemView.setOnClickListener(this);
}
public void bindView (int pos){
x=0;
MenuModel model = menus.get(pos);
mText.setText(model.getNama_menu());
txt2.setText(model.getDeskripsi());
txt3.setText(model.getHarga());
//img.setImageResource(DataMenu.picture[pos]);
txtQty.setText(String.valueOf(x));
btnPlus.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
x++;
txtQty.setText(String.valueOf(x));
}
});
btnMin.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
x--;
if (x<=0){
x=0;
txtQty.setText(String.valueOf(x));
}else if (x>0){
txtQty.setText(String.valueOf(x));
}
}
});
}
#Override
public void onClick(View v) {
}
}
}
And this is my php code
<?php
require_once('connection.php');
//public $mServerName;
//public $mConnectionInfo;
//public $conn;
//Create query to retrieve all contacts
$query = "SELECT * FROM menu";
$stmt = mysqli_query($conn, $query);
if (!$stmt)
{
//Query failed
echo 'Query failed';
}
else
{
$menus= array(); //Create an array to hold all of the contacts
//Query successful, begin putting each contact into an array of contacts
while ($row = mysqli_fetch_array($stmt)) //While there are still contacts
{
//Create an associative array to hold the current contact
//the names must match exactly the property names in the contact class in our C# code.
$menu= array("id" => $row['id_menu'],
"deskripsi" => $row['Deskripsi'],
"nama_menu" => $row['nm_menu'],
"harga" => $row['harga_menu'],
"ImageUrl" =>$row['gambar']
);
//Add the contact to the contacts array
array_push($menus, $menu);
}
//Echo out the contacts array in JSON format
echo json_encode($menus);
}
?>
I changed JSONObject to JSONArray, but that caused many other errors. I am a beginner please help me. I really don't know what to do :(

Parsing JSON data & Load it in Fragments

Excuse me i already had an Application which Display my Sites articles and Novels in Android the codes in Main Activity to display only one Section
i create in the site 5 sections every section had a different content
i Added items to Navigation Drawers and i defined the fragment and its connectivity but the Problem in the Code i failed so
i want to know how to load Data in 4 Fragments
RecyclerViewAdapter.class
import android.content.Context;
import android.support.v7.widget.CardView;
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.TextView;
import android.widget.Toast;
import com.squareup.picasso.Picasso;
import java.util.List;
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private int previousPosition = 0;
private List<com.salim3dd.recyclerview_moredata.List_Item> List_Item;
private Context context;
public RecyclerViewAdapter(List<List_Item> list_Item, Context context) {
List_Item = list_Item;
this.context = context;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View menu1 = LayoutInflater.from(viewGroup.getContext()).inflate(
R.layout.row_item, viewGroup, false);
return new MenuItemViewHolder(menu1);
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
MenuItemViewHolder menuItemHolder = (MenuItemViewHolder) holder;
menuItemHolder.TextName.setText(List_Item.get(position).getStory());
Picasso.with(context).load(List_Item.get(position).getImg_link()).into(menuItemHolder.imageView);
menuItemHolder.imageView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(context, List_Item.get(position).getStory(), Toast.LENGTH_SHORT).show();
}
});
if (position > previousPosition) { //scrolling DOWN
AnimationUtil.animate(menuItemHolder, true);
} else { // scrolling UP
AnimationUtil.animate(menuItemHolder, false);
}
previousPosition = position;
}
#Override
public int getItemCount() {
return (null != List_Item ? List_Item.size() : 0);
}
protected class MenuItemViewHolder extends RecyclerView.ViewHolder {
private CardView cardView;
private ImageView imageView;
private TextView TextName;
public MenuItemViewHolder(View view) {
super(view);
cardView = (CardView) view.findViewById(R.id.cardView);
imageView = (ImageView) view.findViewById(R.id.imageView);
TextName = (TextView) view.findViewById(R.id.TextName);
}
}
}
MainActivity
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
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.StringRequest;
import com.android.volley.toolbox.Volley;
import com.salim3dd.recyclerview_moredata.CheckInternetConnection;
import com.salim3dd.recyclerview_moredata.List_Item;
import com.salim3dd.recyclerview_moredata.R;
import com.salim3dd.recyclerview_moredata.RecyclerViewAdapter;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private RecyclerViewAdapter recyclerView_dAdapter;
public List<List_Item> listItem = new ArrayList<>();
private GridLayoutManager gridLayoutManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.m_RecyclerView);
recyclerView.setHasFixedSize(true);
gridLayoutManager = new GridLayoutManager(this, 1);
recyclerView.setLayoutManager(gridLayoutManager);
recyclerView_dAdapter = new RecyclerViewAdapter(listItem, this);
recyclerView.setAdapter(recyclerView_dAdapter);
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if (gridLayoutManager.findLastCompletelyVisibleItemPosition() == listItem.size() - 1) {
Get_All_Users(listItem.get(listItem.size()-1).getId());
}
}
});
Get_All_Users(0);
}
public void Get_All_Users(int limit) {
CheckInternetConnection cic = new CheckInternetConnection(getApplicationContext());
Boolean Ch = cic.isConnectingToInternet();
if (!Ch) {
Toast.makeText(this, R.string.no_internet_connection, Toast.LENGTH_SHORT).show();
} else {
StringRequest stringRequest = new StringRequest(Request.Method.GET,
"Data Link" + limit
,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONArray jsonArray = new JSONArray(response);
JSONObject jsonResponse = jsonArray.getJSONObject(0);
JSONArray jsonArray_usersS = jsonResponse.getJSONArray("All_storys");
for (int i = 0; i < jsonArray_usersS.length(); i++) {
JSONObject responsS = jsonArray_usersS.getJSONObject(i);
int id = responsS.getInt("id");
String story = responsS.getString("story_name");
String img_link = responsS.getString("img_link");
listItem.add(new List_Item(id, story, img_link));
}
recyclerView_dAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
RequestQueue queue = Volley.newRequestQueue(this);
queue.add(stringRequest);
stringRequest.setShouldCache(false);
}
}
}
List Items.class
public class List_Item {
public int id;
public String story;
public String img_link;
public List_Item(int id, String story, String img_link) {
this.id = id;
this.story = story;
this.img_link = img_link;
}
public int getId() {
return id;
}
public String getStory() {
return story;
}
public String getImg_link() {
return img_link;
}
public void setId(int id) {
this.id = id;
}
}

Periodic Error with CardView and RecycleView

I have this weird periodic error, when i boot the app, and the onCreate is called, but the CardView is not showing anything. Other times I do the exact same thing, booting the app, and the CardView is showing exactly what it should.
I can't seem to find the error..
The main class:
package lassebjoerklund.easyfridge;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.widget.ImageButton;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
public class BootActivity extends Activity {
//TODO Make get method for table with barcode.
//TODO Update postRequest so that it macthes the barcode to the database, and getting a json object. object -> toString
private ArrayList<Products> productsToDisplayInlist;
private String TAG = BootActivity.class.getSimpleName();
private String getDataurl = "http://XXX.XXX.XXX.XXX/selectAll.php";
private static String insertDataUrl = "http://XXX.XXX.XXX.XXX/insertAll.php";
private JsonArrayRequest jsonArrayRequest;
private RecyclerView.Adapter mAdapter;
private String jsonRespons = "";
private static RequestQueue rQueue;
#Override
protected void onCreate(Bundle savedInstanceState) {
//Layout
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_boot_layout);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.cardList);
recyclerView.setHasFixedSize(false);
recyclerView.setLayoutManager(linearLayoutManager);
//RequestQueue
rQueue = Volley.newRequestQueue(this);
productsToDisplayInlist = new ArrayList<>();
getRequest();
Log.d(TAG, productsToDisplayInlist.toString());
mAdapter = new ProductCardAdapter(productsToDisplayInlist);
recyclerView.setAdapter(mAdapter);
//Intent to switch to activity
//final Intent dispalyProductsIntent = new Intent(BootActivity.this, ProductViewController.class);
//final Intent scanBarcodeIntent = new Intent(BootActivity.this, BarcodeTracking.class);
//final ImageButton updateViewButton = (ImageButton) findViewById(R.id.bViewProducts);
/*updateViewButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(dispalyProductsIntent);
}
});*/
/* final ImageButton addNewEntry = (ImageButton) findViewById(R.id.addEntry);
addNewEntry.setOnClickListener(new View.OnClickListener() {
public void onClick(View v){
startActivity(scanBarcodeIntent);
}
});*/
}
#Override
protected void onResume() {
Log.d("onResume", "onResume");
/*Toast toast = Toast.makeText(this, "onResume", Toast.LENGTH_LONG);
toast.show();*/
super.onResume();
}
#Override
protected void onRestart() {
Log.d("onRestart", "onRestart");
/*Toast toast = Toast.makeText(this, "onRestart", Toast.LENGTH_SHORT);
toast.show();*/
super.onRestart();
}
#Override
protected void onStop() {
Log.d("onStop", "onStop");
// productsToDisplayInlist.clear();
super.onStop();
}
#Override
protected void onPause() {
Log.d("onPause", "onPause");
super.onPause();
}
//TODO make error msg if there is no connection.
public void getRequest() {
productsToDisplayInlist.clear();
jsonArrayRequest = new JsonArrayRequest(Request.Method.GET, getDataurl, null, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
//Log.d(TAG, response.toString());
try {
for (int i = 0; i < response.length(); i++) {
JSONObject productToBuild = (JSONObject) response.get(i);
jsonRespons = productToBuild.toString();
String barcode = productToBuild.getString("code");
String name = productToBuild.getString("name");
String type = productToBuild.getString("type");
int id = productToBuild.optInt("id");
String rmDate = productToBuild.getString("rm_date");
String exDate = productToBuild.getString("ex_date");
String placementDate = productToBuild.getString("add_date");
Products product = new Products(barcode, name, placementDate, exDate, rmDate, type);
productsToDisplayInlist.add(product);
Log.d("Product", product.toString());
}
} catch (Exception e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("Volly", "Error");
error.printStackTrace();
}
});
rQueue.add(jsonArrayRequest);
}
public static void postRequest(final Products product) {
try {
StringRequest stringRequest = new StringRequest(Request.Method.POST, insertDataUrl, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
VolleyLog.d("onResponse", response);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("Volley insertData", "ERROR");
Log.d("error: ", error.getCause().toString());
error.printStackTrace();
}
}) {
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> perameters = new HashMap<>();
perameters.put("barcode", product.getBarcode());
perameters.put("addDate", product.getDayOfadd());
perameters.put("exDate", product.getExDate());
return perameters;
}
};
rQueue.add(stringRequest);
} catch (Exception e) {
e.printStackTrace();
}
}
}
Here I init the layout and add the adapter for the RecycleView. The productsToDisplayInList is populated in the getRequest() method. But somehow, it's only periodic getting populated..
Adapter class:
package lassebjoerklund.easyfridge;
import android.graphics.Color;
import android.support.v7.widget.CardView;
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 java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
public class ProductCardAdapter extends RecyclerView.Adapter<ProductHolder> {
private CardView cardView;
private List<Products> productses;
private Calendar c;
public ProductCardAdapter(ArrayList<Products> items) {
productses = items;
}
#Override
public int getItemCount() {
return productses.size();
}
#Override
public void onBindViewHolder(ProductHolder holder, int position) {
Products product = productses.get(position);
Date returnDate = Util.parseDateString(product.getExDate());
if (Util.getCurrentDate().after(returnDate)) {
cardView.setCardBackgroundColor(Color.parseColor("#FF000D"));
holder.cardName.setText(product.getName());
holder.cardAddDate.setText(product.getDayOfadd());
holder.cardExDate.setText(product.getExDate());
holder.cardType.setText(product.getType());
Log.d("Product Card", product.toString());
} else {
holder.cardName.setText(product.getName());
holder.cardAddDate.setText(product.getDayOfadd());
holder.cardExDate.setText(product.getExDate());
holder.cardType.setText(product.getType());
Log.d("Product Card", product.toString());
}
}
#Override
public ProductHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardlayout, parent, false);
cardView = new CardView(parent.getContext());
return new ProductHolder(itemView);
}
#Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
}
Holder Class:
package lassebjoerklund.easyfridge;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.TextView;
public class ProductHolder extends RecyclerView.ViewHolder {
protected TextView cardName;
protected TextView cardAddDate;
protected TextView cardExDate;
protected TextView cardType;
public ProductHolder(View itemView) {
super(itemView);
cardName = (TextView) itemView.findViewById(R.id.cardName);
cardAddDate = (TextView) itemView.findViewById(R.id.cardAddDate);
cardExDate = (TextView) itemView.findViewById(R.id.cardExDate);
cardType = (TextView) itemView.findViewById(R.id.cardType);
}
}