Develop Reference

Display images from Firebase Realtime Database using recyclerView in Androidx

Guys i'm trying to build App like Instagram. I'm struck to fetch the data from the Firebase database and storage. The recyclerView is showing nothing. Help me out in fixing that.
all the data are store in Firebase database.
Recyclerview Adapter page in the fragment page
ProgressBar proBar;
private FirebaseAuth.AuthStateListener authStateListener;
Context context;
String cuurentUser;
FirebaseAuth firebaseAuth;
FirebaseRecyclerAdapter adapter;
RecyclerView recyclerView;
List<Post> postingList;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_reviews, container, false);
PostAdapter postAdapter = new PostAdapter(context, postingList);
recyclerView = view.findViewById(R.id.recycView);
proBar = view.findViewById(R.id.proBar);
recyclerView.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
linearLayoutManager.setReverseLayout(true);
linearLayoutManager.setStackFromEnd(true);
recyclerView.setLayoutManager(linearLayoutManager);
recyclerView.setAdapter(postAdapter);
postAdapter.notifyDataSetChanged();
firebaseAuth = FirebaseAuth.getInstance();
cuurentUser = firebaseAuth.getCurrentUser().getUid();
getDetails();
return view;
}
private void getDetails() {
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
#Override
public void run() {
Query query = FirebaseDatabase.getInstance().getReference().child("Posts").child(cuurentUser);
FirebaseRecyclerOptions<Post> options = new FirebaseRecyclerOptions.Builder<Post>()
.setQuery(query, new SnapshotParser<Post>() {
#NonNull
#Override
public Post parseSnapshot(#NonNull DataSnapshot snapshot) {
return new Post(snapshot.child("id").getValue().toString(),
snapshot.child("profileImg").getValue().toString(),
snapshot.child("username").getValue().toString(),
snapshot.child("postImg").getValue().toString(),
snapshot.child("description").getValue().toString(),
snapshot.child("time").getValue().toString(),
snapshot.child("date").getValue().toString(),
snapshot.child("title").getValue().toString()
);
}
})
.build();
adapter = new FirebaseRecyclerAdapter<Post, PostViewHolder>(options) {
#NonNull
#Override
public PostViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.post_item, parent, false);
//PostViewHolder viewHolder = new PostViewHolder(view);
return new PostViewHolder(view);
}
#Override
protected void onBindViewHolder(#NonNull final PostViewHolder holder, final int position, #NonNull final Post model) {
// String uid = getRef(position).getKey();
holder.uname.setText(model.getUsername());
holder.descrip.setText(model.getDescription());
holder.ptime.setText(model.getTime());
holder.pdate.setText(model.getDate());
holder.ptitle.setText(model.getTitle());
Glide.with(getContext()).load(model.getProfileImg()).into(holder.profImg);
Glide.with(getContext()).load(model.getPostImg()).into(holder.postImage);
holder.linear.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(context, String.valueOf(position), Toast.LENGTH_SHORT).show();
}
});
}
};
recyclerView.setAdapter(adapter);
}
}, 2000);
}
#Override
public void onStart() {
super.onStart();
if(postingList != null)
adapter.startListening();
}
#Override
public void onStop() {
super.onStop();
adapter.stopListening();
}
public static class PostViewHolder extends RecyclerView.ViewHolder {
TextView uname, fname, descrip, ptime, pdate, ptitle;
CircleImageView profImg;
ImageView postImage;
View mview;
LinearLayout linear;
public PostViewHolder(#NonNull View itemView) {
super(itemView);
mview = itemView;
linear = itemView.findViewById(R.id.linearRoot);
uname = itemView.findViewById(R.id.username);
fname = itemView.findViewById(R.id.fullname);
descrip = itemView.findViewById(R.id.description);
ptime = itemView.findViewById(R.id.ptime);
pdate = itemView.findViewById(R.id.pdate);
ptitle = itemView.findViewById(R.id.ptitle);
profImg = itemView.findViewById(R.id.profImg);
postImage = itemView.findViewById(R.id.postImg);
}
}
model page as Post.java
public class Post implements Parcelable {
public Post() {
}
private String uid;
private String postImg;
private String description;
private String username;
private String date;
private String time;
private String profileImg;
private String title;
public Post(String uid, String postImg, String description, String username, String date, String time, String profileImg, String title) {
this.uid = uid;
this.postImg = postImg;
this.description = description;
this.username = username;
this.date = date;
this.time = time;
this.profileImg = profileImg;
this.title = title;
}
protected Post(Parcel in) {
uid = in.readString();
postImg = in.readString();
description = in.readString();
username = in.readString();
date = in.readString();
time = in.readString();
profileImg = in.readString();
title = in.readString();
}
public static final Creator<Post> CREATOR = new Creator<Post>() {
#Override
public Post createFromParcel(Parcel in) {
return new Post(in);
}
#Override
public Post[] newArray(int size) {
return new Post[size];
}
};
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getUid() {
return uid;
}
public void setUid(String uid) {
this.uid = uid;
}
public String getPostImg() {
return postImg;
}
public void setPostImg(String postImg) {
this.postImg = postImg;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public String getTime() {
return time;
}
public void setTime(String time) {
this.time = time;
}
public String getProfileImg() {
return profileImg;
}
public void setProfileImg(String profileImg) {
this.profileImg = profileImg;
}
#Override
public int describeContents() {
return 0;
}
#Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(uid);
dest.writeString(postImg);
dest.writeString(description);
dest.writeString(username);
dest.writeString(date);
dest.writeString(time);
dest.writeString(profileImg);
dest.writeString(title);
}
}
xml page with recyclerView
<FrameLayout 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"
tools:context=".TabLayout.ReviewsFragment">
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/recycView"
/>
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:id="#+id/proBar"/>
</FrameLayout>
Another xml page to show the details is post_item.xml

RecyclerView with different types and different adapter

and thank you for your attention to my request.
I'm a newbie on Andorid Studio and I'm developing an App, it has to show a list of Events, Courses and News. There is a DrawerLayout which allow navigating into Event's, course's and news's area, each area has each specific RecyclerView, but into the home activity, I have to show all the items (Event, Course and News).
I create an Adapter for each item (because they have different properties) and each section (fragment) works properly but now I'm stuck with the main activity (the home).
Here are the models for explaining the difference between them:
Event
public class Event {
private int id;
private String title;
private String description;
private LocalDateTime startingDate;
private LocalDateTime endingDate;
private String cost;
private String website;
private Category category;
private Venue venue;
private Organizer organizer;
private String status;
private int resImage;
public Event(int id, String title, String description, LocalDateTime startingDate, LocalDateTime endingDate, String cost, String website, Category category, Venue venue, Organizer organizer, int image) {
this.id = id;
this.title = title;
this.description = description;
this.startingDate = startingDate;
this.endingDate = endingDate;
this.cost = cost;
this.website = website;
this.category = category;
this.venue = venue;
this.organizer = organizer;
this.resImage = image;
}
public Event(){}
public int getId() {
return id;
}
public String getTitle() {
return title;
}
public void setTitle(String name) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public LocalDateTime getStartingDate() {
return startingDate;
}
public void setStartingDate(LocalDateTime startingDate) {
this.startingDate = startingDate;
}
public LocalDateTime getEndingDate() {
return endingDate;
}
public void setEndingDate(LocalDateTime endingDate) {
this.endingDate = endingDate;
}
public String getCost() {
return cost;
}
public void setCost(String cost) {
this.cost = cost;
}
public String getWebsite() {
return website;
}
public void setWebsite(String website) {
this.website = website;
}
public Category getCategory() {
return category;
}
public Venue getVenue() {
return venue;
}
public Organizer getOrganizer() {
return organizer;
}
public String getStatus() {
return status;
}
public int getResImage() {
return resImage;
}
}
News:
public class News {
private int id;
private String title;
private String content;
private int resImage;
public News(int id, String title, String content, int image) {
this.id = id;
this.title = title;
this.content = content;
this.resImage = image;
}
public News(){}
public int getId(){
return this.id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setDescription(String description) {
this.content = content;
}
public int getResImage() {
return resImage;
}
public void setResImage(int resImage) {
this.resImage = resImage;
}
}
Courses
public Course(int id, String title, String content, float price, LocalDate startingDate, int availablePlace, Teacher teacher, CourseCategory courseCategory, Location location, Duration duration, Level level, int resImage) {
this.id = id;
this.title = title;
this.content = content;
this.price = price;
this.startingDate = startingDate;
this.availablePlace = availablePlace;
this.teacher = teacher;
this.courseCategory = courseCategory;
this.location = location;
this.duration = duration;
this.level = level;
this.resImage = resImage;
}
public int getId() {
return id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public float getPrice() {
return price;
}
public void setPrice(float price) {
this.price = price;
}
public LocalDate getStartingDate() {
return startingDate;
}
public void setStartingDate(LocalDate startingDate) {
this.startingDate = startingDate;
}
public int getAvailablePlace() {
return availablePlace;
}
public void setAvailablePlace(int availablePlace) {
this.availablePlace = availablePlace;
}
public Teacher getTeacher() {
return teacher;
}
public void setTeacher(Teacher teacher) {
this.teacher = teacher;
}
public CourseCategory getCourseCategory() {
return courseCategory;
}
public void setCourseCategory(CourseCategory courseCategory) {
this.courseCategory = courseCategory;
}
public Location getLocation() {
return location;
}
public void setLocation(Location location) {
this.location = location;
}
public Duration getDuration() {
return duration;
}
public void setDuration(Duration duration) {
this.duration = duration;
}
public Level getLevel() {
return level;
}
public int getResImage() {
return resImage;
}
public void setResImage(int resImage) {
this.resImage = resImage;
}
}
Here is the Adapters:
EventAdapter
public class EventViewAdapter extends RecyclerView.Adapter<EventViewAdapter.EventViewHolder> {
ArrayList<Event> eventList;
Context context;
public EventViewAdapter(ArrayList<Event> eventList, Context context) {
this.eventList = eventList;
this.context = context;
}
public EventViewAdapter() {
}
public static class EventViewHolder extends RecyclerView.ViewHolder {
ImageView eventImage;
TextView startingDate, place, title;
LinearLayout cellLayout;
EventViewHolder(View eventView) {
super(eventView);
eventImage = eventView.findViewById(R.id.event_image);
startingDate = eventView.findViewById(R.id.event_starting_date);
place = eventView.findViewById(R.id.event_place);
title = eventView.findViewById(R.id.event_title);
cellLayout = eventView.findViewById(R.id.event_cell_layout);
}
}
#NonNull
#Override
public EventViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.event_cell_def, parent, false);
EventViewHolder evh = new EventViewHolder(view);
return evh;
}
#Override
public void onBindViewHolder(#NonNull EventViewHolder holder, int position) {
final String title = eventList.get(position).getTitle();
final String description = eventList.get(position).getDescription();
final String place = eventList.get(position).getVenue().getCity();
final String address = eventList.get(position).getVenue().getAddress();
final String startDate = String.valueOf(eventList.get(position).getStartingDate().toLocalDate());
final String startTime = String.valueOf(eventList.get(position).getStartingDate().getHour() + ":" + String.valueOf(eventList.get(position).getStartingDate().getMinute()));
final String endDate = String.valueOf(eventList.get(position).getEndingDate().toLocalDate());
final String cost = eventList.get(position).getCost();
final String website = eventList.get(position).getWebsite();
final String category = eventList.get(position).getCategory().getName();
final String organizer = eventList.get(position).getOrganizer().getOrganizer();
final String organizerWebsite = eventList.get(position).getOrganizer().getWebsite();
final int image = eventList.get(position).getResImage();
holder.eventImage.setImageResource(image);
holder.startingDate.setText(startDate);
holder.place.setText(place);
holder.title.setText(title);
holder.cellLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), DetailEventActivity.class);
intent.putExtra("title", title);
intent.putExtra("description", description);
intent.putExtra("place", place);
intent.putExtra("address", address);
intent.putExtra("startDate", startDate);
intent.putExtra("startTime", startTime);
intent.putExtra("endDate", endDate);
intent.putExtra("cost", cost);
intent.putExtra("website", website);
intent.putExtra("category", category);
intent.putExtra("organizer", organizer);
intent.putExtra("orgWebsite", organizerWebsite);
intent.putExtra("image", image);
v.getContext().startActivity(intent);
Toast.makeText(context, "Hai premuto su: " + title, Toast.LENGTH_SHORT).show();
}
});
}
#Override
public int getItemCount() {
return eventList.size();
}
public void eventSetSearchOperation(ArrayList<Event> newList){
eventList = new ArrayList<>();
eventList.addAll(newList);
notifyDataSetChanged();
}
}
CourseAdapter:
public class CourseViewAdapter extends RecyclerView.Adapter<CourseViewAdapter.CourseViewHolder> {
ArrayList<Course> courseList;
Context context;
public CourseViewAdapter(ArrayList<Course> courseList, Context context) {
this.courseList = courseList;
this.context = context;
}
public CourseViewAdapter(){}
public static class CourseViewHolder extends RecyclerView.ViewHolder {
ImageView courseImage;
TextView startingDate, place, title;
LinearLayout courseLinear;
CourseViewHolder(View courseView){
super(courseView);
courseImage = courseView.findViewById(R.id.course_image);
startingDate = courseView.findViewById(R.id.course_starting_date);
place = courseView.findViewById(R.id.course_place);
title = courseView.findViewById(R.id.course_title);
courseLinear = courseView.findViewById(R.id.course_cell_layout);
}
}
#NonNull
#Override
public CourseViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.course_cell_def, parent, false);
CourseViewHolder cvh = new CourseViewHolder(view);
return cvh;
}
#Override
public void onBindViewHolder(#NonNull CourseViewHolder holder, int position) {
final String title = courseList.get(position).getTitle();
final String category = courseList.get(position).getCourseCategory().getName();
final String description = courseList.get(position).getContent();
final String place = courseList.get(position).getLocation().getName();
final String startDate = String.valueOf(courseList.get(position).getStartingDate());
final int availablePlace = courseList.get(position).getAvailablePlace();
final String teacher = courseList.get(position).getTeacher().getName();
final String teacherEmail = courseList.get(position).getTeacher().getEmail();
final String teacherMobile = courseList.get(position).getTeacher().getPhone();
final String duration = courseList.get(position).getDuration().getName();
final String level = courseList.get(position).getLevel().getName();
final String price = String.valueOf(courseList.get(position).getPrice());
final int image = courseList.get(position).getResImage();
holder.courseImage.setImageResource(image);
holder.startingDate.setText(startDate);
holder.place.setText(place);
holder.title.setText(title);
holder.courseLinear.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), DetailCourseActivity.class);
intent.putExtra("title", title);
intent.putExtra("category", category);
intent.putExtra("content", description);
intent.putExtra("startDate", startDate);
intent.putExtra("availablePlace", availablePlace);
intent.putExtra("teacher", teacher);
intent.putExtra("teacherEmail", teacherEmail);
intent.putExtra("teacherMobile", teacherMobile);
intent.putExtra("duration", duration);
intent.putExtra("price", price);
intent.putExtra("place", place);
intent.putExtra("level", level);
intent.putExtra("image", image);
v.getContext().startActivity(intent);
Toast.makeText(context, "Hai premuto su: " + title, Toast.LENGTH_SHORT).show();
}
});
}
#Override
public int getItemCount() {
return courseList.size();
}
public void courseSetSearchOperation(ArrayList<Course> newList){
courseList = new ArrayList<>();
courseList.addAll(newList);
notifyDataSetChanged();
}
}
News:
public class NewsViewAdapter extends RecyclerView.Adapter<NewsViewAdapter.NewsViewHolder> {
ArrayList<News> newsList;
Context context;
public NewsViewAdapter(ArrayList<News> newsList, Context context) {
this.newsList = newsList;
this.context = context;
}
public NewsViewAdapter(){}
public static class NewsViewHolder extends RecyclerView.ViewHolder {
ImageView newsImage;
TextView newsTitle, newsContent;
LinearLayout newsLayout;
NewsViewHolder(View newView){
super(newView);
newsImage = newView.findViewById(R.id.news_image);
newsTitle = newView.findViewById(R.id.news_title);
newsContent = newView.findViewById(R.id.news_content);
newsLayout = newView.findViewById(R.id.news_cell_layout);
}
}
#NonNull
#Override
public NewsViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.news_cell_def, parent, false);
NewsViewHolder nvh = new NewsViewHolder(view);
return nvh;
}
#Override
public void onBindViewHolder(#NonNull NewsViewHolder holder, int position) {
final String title = newsList.get(position).getTitle();
final String content = newsList.get(position).getContent();
final int image = newsList.get(position).getResImage();
holder.newsImage.setImageResource(image);
holder.newsTitle.setText(title);
holder.newsContent.setText(content);
holder.newsLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), DetailNewsActivity.class);
intent.putExtra("title", title);
intent.putExtra("content", content);
intent.putExtra("image", image);
v.getContext().startActivity(intent);
Toast.makeText(context, "Premuto su: " + title, Toast.LENGTH_SHORT).show();
}
});
}
#Override
public int getItemCount() {
return newsList.size();
}
public void newsSetSearchOperation(ArrayList<News> newList){
newsList = new ArrayList<>();
newsList.addAll(newList);
notifyDataSetChanged();
}
}
Each specific list of item is into a fragment, indeed here is the Main Activity (home), where I would like to display a RecyclerView of all the itmes:
public class MainActivity extends AppCompatActivity {
private DrawerLayout drawerLayout;
private NavigationView mNavigationView;
private Toolbar toolbar;
private ActionBarDrawerToggle drawerToggle;
private FloatingActionButton fab;
private RecyclerView mRecyclerView;
private ImageView openFilter;
private SearchView searchView;
private DataMock dataMock = new DataMock();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = findViewById(R.id.recycler_view_main);
drawerLayout = findViewById(R.id.drawer_layout);
mNavigationView = findViewById(R.id.nav_view);
toolbar = findViewById(R.id.toolbar);
openFilter = findViewById(R.id.filter_icon);
searchView = findViewById(R.id.action_search);
fab = findViewById(R.id.fab);
fab.show();
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
searchView.setQueryHint(getString(R.string.search_hint));
drawerToggle = setupDrawerToggle();
drawerToggle.setDrawerIndicatorEnabled(true);
drawerToggle.syncState();
drawerLayout.setDrawerListener(drawerToggle);
drawerLayout.setDrawerListener(new DrawerLayout.SimpleDrawerListener() {
#Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
}
#Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
}
});
mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem menuItem) {
Fragment nextFragment;
switch (menuItem.getItemId()){
case R.id.event_list:
nextFragment = new EventFragment();
break;
case R.id.course_list:
nextFragment = new CourseFragment();
break;
case R.id.news_list:
nextFragment = new NewsFragment();
break;
default:
throw new IllegalArgumentException("No Fragment for the given menu item");
}
if (nextFragment != null){
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.anchor_point, nextFragment)
.commit();
menuItem.setChecked(true);
setTitle(menuItem.getTitle());
drawerLayout.closeDrawer(mNavigationView);
}
return false;
}
});
openFilter.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
BottomSheetDialog filterDialog = new BottomSheetDialog();
filterDialog.show(getSupportFragmentManager(), "filter dialog opened!");
}
});
// mRecyclerView.setHasFixedSize(true);
// LinearLayoutManager layoutManager = new LinearLayoutManager(this);
// mRecyclerView.setLayoutManager(layoutManager);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// The action bar home/up action should open or close the drawer.
switch (item.getItemId()) {
case android.R.id.home:
drawerLayout.openDrawer(GravityCompat.START);
return true;
}
return super.onOptionsItemSelected(item);
}
private ActionBarDrawerToggle setupDrawerToggle() {
// NOTE: Make sure you pass in a valid toolbar reference. ActionBarDrawToggle() does not require it
// and will not render the hamburger icon without it.
return new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.drawer_open, R.string.drawer_close);
}
public void backToHome(View view){
for (Fragment fragment : getSupportFragmentManager().getFragments()){
if (fragment != null && (fragment instanceof CourseFragment || fragment instanceof EventFragment || fragment instanceof NewsFragment)){
getSupportFragmentManager().beginTransaction().remove(fragment).commit();
toolbar.setTitle("WePress");
fab.show();
}
}
Toast.makeText(this, "Premuto sul logo", Toast.LENGTH_SHORT).show();
drawerLayout.closeDrawer(mNavigationView);
}
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
drawerToggle.syncState();
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggles
drawerToggle.onConfigurationChanged(newConfig);
}
public void addItem(View view){
PopupMenu popupMenu = new PopupMenu(MainActivity.this, fab);
popupMenu.getMenuInflater().inflate(R.menu.fab_main_menu, popupMenu.getMenu());
popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
#Override
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()){
case R.id.add_event:
Toast.makeText(MainActivity.this, "Pronti per aggiungere un evento", Toast.LENGTH_SHORT).show();
Intent intentEvent = new Intent(MainActivity.this, AddItemActivity.class);
intentEvent.putExtra("isFrom", "event");
startActivity(intentEvent);
break;
case R.id.add_course:
Toast.makeText(MainActivity.this, "Pronti per aggiungere un corso", Toast.LENGTH_SHORT).show();
Intent intentCourse = new Intent(MainActivity.this, AddItemActivity.class);
intentCourse.putExtra("isFrom", "course");
startActivity(intentCourse);
break;
case R.id.add_news:
Toast.makeText(MainActivity.this, "Pronti per aggiungere una news", Toast.LENGTH_SHORT).show();
Intent intentNews = new Intent(MainActivity.this, AddItemActivity.class);
intentNews.putExtra("isFrom", "news");
startActivity(intentNews);
break;
}
return true;
}
});
popupMenu.show();
}
}
if it's possible to show the list with differents layouts, can you also suggest a way to improve the quality of my code avoiding to repeat lines of code? If I'm not wrong, I would like to re-use each Adapter or part of them that I can put into a specific class (?).
Thank you so much for your help!
If I'm missing some information, please ask me in order to edit the post.

You must do only one adapter (using view type) with a view model class
that contain either an event or a news or a course
the adapter should be something like that:
public class EventViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static final int TYPE_EVENT = 10;
private static final int TYPE_COURSE = 11;
private static final int TYPE_NEWS = 12;
ArrayList<EventViewModel> eventList;
Context context;
public EventViewAdapter(ArrayList<EventViewModel> eventList, Context context) {
this.eventList = eventList;
this.context = context;
}
public EventViewAdapter() {
}
#Override
public int getItemViewType(int position) {
EventViewModel event = eventList.get(position);
if (event.isEvent()) {
return TYPE_EVENT ;
} else if(event.isCourse()) {
return TYPE_COURSE;
} else {
return TYPE_NEWS;
}
}
public static class EventViewHolder extends RecyclerView.ViewHolder {
ImageView eventImage;
//....
EventViewHolder(View eventView) {
super(eventView);
eventImage = eventView.findViewById(R.id.event_image);
//.....
}
}
public static class CourseViewHolder extends RecyclerView.ViewHolder {
ImageView courseImage;
//.....
CourseViewHolder(View courseView) {
super(courseView);
courseImage = courseView.findViewById(R.id.course_image);
//.....
}
public static class NewsViewHolder extends RecyclerView.ViewHolder {
ImageView newsImage;
//.....
NewsViewHolder(View newView){
super(newView);
newsImage = newView.findViewById(R.id.news_image);
//.....
}
#NonNull
#Override
public RecyclerView.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
if (viewType == TYPE_EVENT) {
View rootView = LayoutInflater.from(parent.getContext()).inflate(R.layout.event_cell_def, parent, false);
return new EventViewHolder (rootView);
} else if (viewType == TYPE_COURSE) {
View rootView = LayoutInflater.from(parent.getContext()).inflate(R.layout.course_cell_def, parent, false);
return new CourseViewHolder(rootView);
} else {
View rootView = LayoutInflater.from(parent.getContext()).inflate(R.layout.news_cell_def, parent, false);
return new NewsViewHolder(rootView);
}
}
#Override
public void onBindViewHolder(#NonNull EventViewHolder holder, int position)
{
final EventViewModel eventViewModel = eventList.get(position);
if (eventViewModel .isEvent()) {
onBindEvent(holder, eventViewModel.getEvent());
} else if(eventViewModel .isCourse()) {
onBindCourse(holder, eventViewModel.getCourse());
} else {
onBindNews(holder, eventViewModel.getNews());
}
}
private void onBindEvent(RecyclerView.ViewHolder holder, Event event) {
EventViewHolder eventHolder= (EventViewHolder ) holder;
final String title = event.getTitle();
final String description = event.getDescription();
// others ...
holder.eventImage.setImageResource(image);
holder.startingDate.setText(startDate);
// others ...
holder.cellLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
// ...
}
#Override
public int getItemCount() {
return eventList.size();
}
public void eventSetSearchOperation(ArrayList<Event> newList){
eventList = new ArrayList<>();
eventList.addAll(newList);
notifyDataSetChanged();
}
}
And a View Model classes like that :
public class EventViewModel() {
private Event mEvent;
private Course mCourse;
private News mNews;
private EventViewModel(Event event, Course course, News news) {
this.mEvent = event;
this.mCourse = course;
this.mNews = news;
}
public boolean isEvent() {
return mEvent != null
}
public boolean isCourse() {
return mCourse != null
}
public boolean isNews() {
return mNews != null
}
public static EventViewModel getEventInstance(Event event) {
return new EventViewModel(event, null, null
}
public static EventViewModel getCourseInstance(Course course) {
return new EventViewModel(null, course, null
}
public static EventViewModel getNewsInstance(News news) {
return new EventViewModel(null, null, news
}
public Event getEvent() {
return mEvent;
}
public Event getCourse() {
return mScore;
}
public Event getNews() {
return mNews;
}
}
You can use this adapter in all of your fragments (event, course, news) and each fragment contaions a list of EventViewModel with only its specific type. The adapter display in the main activity contains EventViewModel of all types to display all events.

How to Show GridView Image In Android Fragments Using Json (categories and subcategories)

Those are categories and subcategories. There can be subcategory or not.
JsonCode to be used is as below.
categoryId is what will change to call subcategories.
E.g. If you want to see subcategories of cars
Json Code
[{"Id":1,"TitleEN":"Cars","TitleAR":"سيارات","Photo":"http://souq.hardtask.co//Files/CategoryPhotos/ce686544-9f51-4213-b5db-7c015b788e8d.png","ProductCount":"3","HaveModel":"0","SubCategories":[{"Id":6,"TitleEN":"Cat6","TitleAR":"قسم6","Photo":"http://souq.hardtask.co//Files/CategoryPhotos/ce686544-9f51-4213-b5db-7c015b788e8d.png","ProductCount":"3","HaveModel":"0","SubCategories":[]}]},{"Id":2,"TitleEN":"Cat2","TitleAR":"قسم2","Photo":"http://souq.hardtask.co//Images/no_image.png","ProductCount":"8","HaveModel":"0","SubCategories":[{"Id":13,"TitleEN":"cat1 -1 ","TitleAR":"cat1 - 1","Photo":"http://souq.hardtask.co//Images/no_image.png","ProductCount":"8","HaveModel":"0","SubCategories":[]}]},{"Id":3,"TitleEN":"Cat3","TitleAR":"قسم3","Photo":"http://souq.hardtask.co//Images/no_image.png","ProductCount":"2","HaveModel":"0","SubCategories":[]},{"Id":4,"TitleEN":"Cat4","TitleAR":"قسم4","Photo":"http://souq.hardtask.co//Images/no_image.png","ProductCount":"1","HaveModel":"0","SubCategories":[]},{"Id":5,"TitleEN":"Cat5","TitleAR":"قسم5","Photo":"http://souq.hardtask.co//Images/no_image.png","ProductCount":"0","HaveModel":"0","SubCategories":[]},{"Id":8,"TitleEN":"Cat8","TitleAR":"قسم8","Photo":"http://souq.hardtask.co//Images/no_image.png","ProductCount":"0","HaveModel":"0","SubCategories":[]},{"Id":9,"TitleEN":"Slide01","TitleAR":"Slide02","Photo":"http://souq.hardtask.co//Files/CategoryPhotos/2ba07cb2-49a0-47e4-aba6-ef10a916fb12.png","ProductCount":"0","HaveModel":"0","SubCategories":[]}]
ImageAdapter
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context c){
mContext = c;
}
#Override
public int getCount(){
return images.size();
}
#Override
public Object getItem(int position){
return images.get(position);
}
public long getItemId(int position){
return 0;
}
public View getView(int position, View convertView, ViewGroup parent){
ImageView imageview;
if (convertView == null){
imageview = new ImageView(mContext);
imageview.setPadding(0, 0, 0, 0);
//imageview.setLayoutParams(new GridLayout.MarginLayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
imageview.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
imageview.setAdjustViewBounds(true);
} else {
imageview = (ImageView) convertView;
}
Picasso.with(mContext).load(images.get(position)).placeholder(R.mipmap.ic_launcher).into(imageview);
return imageview;
}
/*
Custom methods
*/
public void addItem(String url){
images.add(url);
}
public void clearItems() {
images.clear();
}
public ArrayList<String> images = new ArrayList<String>();
}
Movie Model
public class Movie implements Parcelable {
public String TitleEN;
public String TitleAR;
public String Photo;
public int id;
public Movie(){
}
protected Movie(Parcel in) {
TitleEN = in.readString();
TitleAR = in.readString();
Photo = in.readString();
id = in.readInt();
}
#Override
public int describeContents() {
return 0;
}
#Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(TitleEN);
dest.writeString(TitleAR);
dest.writeString(Photo);
dest.writeInt(id);
}
#SuppressWarnings("unused")
public static final Parcelable.Creator<Movie> CREATOR = new Parcelable.Creator<Movie>() {
#Override
public Movie createFromParcel(Parcel in) {
return new Movie(in);
}
#Override
public Movie[] newArray(int size) {
return new Movie[size];
}
};
}
Fragament_main
public class Fragament_main extends Fragment {
public View mainFragmentView;
public String LOG_TAG = "ShowcaseFragment";
public ArrayList<Movie> movies = new ArrayList<Movie>();
private RequestQueue mRequestQueue;
public ImageAdapter imageAdapter;
public static Fragament_main instance;
GridView gridview;
public boolean isDualPane = false;
// static to preserve sorting over orientation changes (activity restart)
public static String sortOrder = "popularity.desc", moreParams = "";
public static boolean setting_cached = false;
public int gridPos = -1;
public Fragament_main() {
// Required empty public constructor
instance = this;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mainFragmentView = inflater.inflate(R.layout.fragment_main, container, false);
mRequestQueue = Volley.newRequestQueue(getContext());
// setup adapters
imageAdapter = new ImageAdapter(getContext());
gridview = (GridView) mainFragmentView.findViewById(R.id.gridView);
gridview.setAdapter(imageAdapter);
//updateUI(setting_cached);
//gridview.setOnItemClickListener(new GridClickListener());
// manage grid col count wrt Orientation
if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE)
setGridColCount(3);
else
setGridColCount(2);
return mainFragmentView;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("GRIDVIEW_POSITION", gridview.getFirstVisiblePosition());
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (savedInstanceState != null)
gridPos = savedInstanceState.getInt("GRIDVIEW_POSITION");
}
#Override
public void onDestroyView() {
super.onDestroyView();
mRequestQueue.cancelAll(new RequestQueue.RequestFilter() {
#Override
public boolean apply(Request<?> request) {
return true;
}
});
}
/*class GridClickListener implements AdapterView.OnItemClickListener {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
if (isDualPane){
android.support.v4.app.FragmentTransaction ft = getActivity().getSupportFragmentManager().beginTransaction();
DetailActivityFragment detailActivityFragment = DetailActivityFragment.newInstance(movies.get(position));
ft.replace(R.id.detailContainer, detailActivityFragment);
ft.commit();
} else {
Intent intent = new Intent(getContext(), DetailActivity.class);
intent.putExtra(Intent.EXTRA_TEXT, (Parcelable) movies.get(position));
startActivity(intent);
}
}
}*/
/* public void updateUI(boolean cached){
movies.clear();
imageAdapter.clearItems();
setting_cached = cached;
if (!cached)
getMovies(sortOrder, moreParams);
else
getFavorites();
}
*/
public void getMovies(String sortOrder, String moreParams){
String url = "http://souq.hardtask.co/app/app.asmx/GetCategories?categoryId=0&countryId=1";
JsonObjectRequest req = new JsonObjectRequest(url, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray items = response.getJSONArray("results");
JSONObject movieObj;
for (int i=0; i<items.length(); i++){
movieObj = items.getJSONObject(i);
Movie movie = new Movie();
movie.id = movieObj.getInt("id");
movie.TitleEN = movieObj.getString("original_title");
movie.TitleAR = movieObj.getString("overview");
movie.Photo = "http://souq.hardtask.co/app/app.asmx/GetCategories?categoryId=0&countryId=1" + movieObj.getString("poster_path");
movies.add(movie);
// Add image to adapter
imageAdapter.addItem(movie.Photo);
}
} catch (JSONException e){
e.printStackTrace();
}
getActivity().runOnUiThread(new Runnable() {
#Override
public void run() {
gridview.setAdapter(imageAdapter);
if (gridPos > -1)
gridview.setSelection(gridPos);
gridPos = -1;
}
});
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.d(LOG_TAG, "Error in JSON Parsing");
}
});
mRequestQueue.add(req);
}
/* public void getFavorites(){
movies.addAll((new MoviesDB()).getFavoriteMovies(getContext().getContentResolver()));
for (Movie movie : movies){
imageAdapter.addItem(movie.Photo);
}
gridview.setAdapter(imageAdapter);
if (gridPos > -1)
gridview.setSelection(gridPos);
gridPos = -1;
}*/
public void updateFavoritesGrid(){
if (setting_cached) {
int p = gridview.getLastVisiblePosition();
///updateUI(true);
gridview.smoothScrollToPosition(p);
}
}
public void setGridColCount(int n){
((GridView) mainFragmentView.findViewById(R.id.gridView)).setNumColumns(n);
}
}
I don't know how to add Json data into GridView.
Could you help me?

Go through this example to view images in grid,
Convert your jsonArray into an ArrayList by using,
ArrayList<Cars> carsList = new Gson().fromJson(jsonArrayYouHave.toString(),new TypeToken<List<Cars>>() {
}.getType());
Pass this Array to your Adapter.
Use this POJO,
public class Cars {
private String TitleAR;
private String HaveModel;
private String TitleEN;
private String Id;
private ArrayList<SubCategories> SubCategories;
private String Photo;
private String ProductCount;
//Todo please add getter/setters for class Cars variables here
public class SubCategories {
private String TitleAR;
private String HaveModel;
private String TitleEN;
private String Id;
private ArrayList<String> SubCategories;
private String Photo;
private String ProductCount;
//Todo please add getter/setters for class SubCategories variables here
}
I'll suggest to use Retrofit as it'll provide you parsed arraylist which is converted into Response POJO you have provided. You can find many examples for Retrofit.

Step 1
Add the following dependencies in your app level gradle file.Dependencies are for retrofit, gsonConvertor butterknife and glide.
implementation 'com.squareup.retrofit2:retrofit:2.1.0'
implementation 'com.google.code.gson:gson:2.6.2'
implementation 'com.squareup.retrofit2:converter-gson:2.1.0'
implementation('com.squareup.retrofit2:retrofit:2.1.0') {
// exclude Retrofit’s OkHttp dependency module and define your own module import
exclude module: 'okhttp'
}
implementation 'com.google.code.gson:gson:2.6.2'
implementation 'com.squareup.retrofit2:converter-gson:2.1.0'
implementation 'com.squareup.okhttp3:logging-interceptor:3.4.1'
implementation 'com.squareup.okhttp3:okhttp:3.4.1'
implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support:recyclerview-v7:28.0.0'
implementation "com.jakewharton:butterknife:$BUTTER_KNIFE_VERSION"
annotationProcessor "com.jakewharton:butterknife-compiler:$BUTTER_KNIFE_VERSION"
implementation 'com.github.bumptech.glide:glide:4.8.0'
annotationProcessor 'com.github.bumptech.glide:compiler:4.8.0'
Step 2 Create a class by name ApiClient and paste the following code in this class
public class ApiClient {
private static Retrofit retrofit = null;
public static Retrofit getRetrofit() {
HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
OkHttpClient client = new OkHttpClient.Builder().addInterceptor(interceptor).build();
retrofit = new Retrofit.Builder()
.baseUrl("http://souq.hardtask.co")
.addConverterFactory(GsonConverterFactory.create())
.client(client)
.build();
return retrofit;
}
}
Step 3 Create a new Interface class by name APIInterface and paste the following code in this class
#GET("/app/app.asmx/GetCategories")
Call<List<Product>> getProducts(#QueryMap Map<String, String> params);
Step 4 Create POJO classes according to json response. We have two classes Products and their subcategory.So I am creating first class by name Product
public class Product {
#SerializedName("Id")
#Expose
private Integer id;
#SerializedName("TitleEN")
#Expose
private String titleEN;
#SerializedName("TitleAR")
#Expose
private String titleAR;
#SerializedName("Photo")
#Expose
private String photo;
#SerializedName("ProductCount")
#Expose
private String productCount;
#SerializedName("HaveModel")
#Expose
private String haveModel;
#SerializedName("SubCategories")
#Expose
private List<SubCategory> subCategories = null;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getTitleEN() {
return titleEN;
}
public void setTitleEN(String titleEN) {
this.titleEN = titleEN;
}
public String getTitleAR() {
return titleAR;
}
public void setTitleAR(String titleAR) {
this.titleAR = titleAR;
}
public String getPhoto() {
return photo;
}
public void setPhoto(String photo) {
this.photo = photo;
}
public String getProductCount() {
return productCount;
}
public void setProductCount(String productCount) {
this.productCount = productCount;
}
public String getHaveModel() {
return haveModel;
}
public void setHaveModel(String haveModel) {
this.haveModel = haveModel;
}
public List<SubCategory> getSubCategories() {
return subCategories;
}
public void setSubCategories(List<SubCategory> subCategories) {
this.subCategories = subCategories;
}
}
And SubCategory
public class SubCategory {
#SerializedName("Id")
#Expose
private Integer id;
#SerializedName("TitleEN")
#Expose
private String titleEN;
#SerializedName("TitleAR")
#Expose
private String titleAR;
#SerializedName("Photo")
#Expose
private String photo;
#SerializedName("ProductCount")
#Expose
private String productCount;
#SerializedName("HaveModel")
#Expose
private String haveModel;
#SerializedName("SubCategories")
#Expose
private List<Object> subCategories = null;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getTitleEN() {
return titleEN;
}
public void setTitleEN(String titleEN) {
this.titleEN = titleEN;
}
public String getTitleAR() {
return titleAR;
}
public void setTitleAR(String titleAR) {
this.titleAR = titleAR;
}
public String getPhoto() {
return photo;
}
public void setPhoto(String photo) {
this.photo = photo;
}
public String getProductCount() {
return productCount;
}
public void setProductCount(String productCount) {
this.productCount = productCount;
}
public String getHaveModel() {
return haveModel;
}
public void setHaveModel(String haveModel) {
this.haveModel = haveModel;
}
public List<Object> getSubCategories() {
return subCategories;
}
public void setSubCategories(List<Object> subCategories) {
this.subCategories = subCategories;
}
}
Step 5 now we need a view for recyclerview holder(in your case gridview layout). For that we need to create a new layout file inside layout folder. you can name it li_product_view
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<RelativeLayout
android:layout_width="200dp"
android:layout_height="200dp">
<ImageView
android:id="#+id/ImageView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#mipmap/ic_launcher" />
<TextView
android:id="#+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#id/ImageView"
android:layout_alignTop="#id/ImageView"
android:layout_alignRight="#id/ImageView"
android:layout_alignBottom="#id/ImageView"
android:text="#string/app_name"
android:gravity="bottom|right" />
</RelativeLayout>
</RelativeLayout>
Step 6 Now we need itemHolder to hold the view for that purpose we will create a new class by name ProductsItemHolderand will have the following code
public class ProductsItemHolder extends RecyclerView.ViewHolder {
#BindView(R.id.ImageView)
ImageView imageView;
#BindView(R.id.tv_title)
TextView textView;
public ProductsItemHolder(#NonNull View itemView) {
super(itemView);
ButterKnife.bind(this,itemView);
}
public void bindData(Product datum, int position, int size) {
Glide.with(itemView)
.asBitmap()
.load(datum.getPhoto())
.into(imageView);
textView.setText(datum.getTitleAR());
}
}
Step 7 Now we need adapter which contains the data to present inside recyclerview. Create a new class by name ProductsAdapter and paste the following code inside this class
public class ProductsAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private List<Product> mList;
#NonNull
#Override
public RecyclerView.ViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.li_product_view, viewGroup, false);
return new ProductsItemHolder(view);
}
#Override
public void onBindViewHolder(#NonNull RecyclerView.ViewHolder viewHolder, int position) {
int size= mList.size();
((ProductsItemHolder) viewHolder).bindData(mList.get(position), position,size);
}
#Override
public int getItemCount() {
return mList.size();
}
public void setData(List<Product> userLists) {
this.mList = userLists;
notifyDataSetChanged();
}
}
Step 8 now inside the activity or fragment we need to get response from json and pass this response to recyclerview.
public class MainActivity extends AppCompatActivity {
APIInterface apiInterfacePages;
RecyclerView recyclerView;
List<MultipleResource.Datum> datumList= new ArrayList<>();
ProgressDialog dialog;
ProductsAdapter productsAdapter;
private List<Product> dataArrayList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
apiInterfacePages= PageApiClient.getRetrofit().create(APIInterface.class);
recyclerView= findViewById(R.id.recyclerView);
productsAdapter= new ProductsAdapter();
StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(2, LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(staggeredGridLayoutManager);
getData();
}
private void getData() {
dataArrayList = new ArrayList<>();
Map<String, String> params = new HashMap<String, String>();
params.put("categoryId", "0");
params.put("countryId", "1");
Call<List<Product>> call= apiInterfacePages.getProducts(params);
call.enqueue(new Callback<List<Product>>() {
#Override
public void onResponse(Call<List<Product>> call, Response<List<Product>> response) {
dataArrayList = response.body();
productsAdapter.setData(dataArrayList);
recyclerView.setAdapter(productsAdapter);
}
#Override
public void onFailure(Call<List<Product>> call, Throwable t) {
Log.i("Call response",t.getMessage());
}
});
}
}

How can i set another data into constructor DataModel in Retrofit in Android

In my application I should load data from server and for this job I use Retrofit library.
In my application i want load string data from server and i should load images from drawable folder .
I can load string from server and show it on textview, but when add images i don't know how can i it?!
DataModel:
public class Retrofit_ColoniesModel {
//Load from server
#SerializedName("id")
private Integer id;
#SerializedName("slug")
private String slug;
#SerializedName("title")
private String title;
#SerializedName("description")
private String description;
#SerializedName("parent")
private Integer parent;
#SerializedName("post_count")
private Integer post_count;
//Load from local
private int[] image;
public Retrofit_ColoniesModel(Integer id, String slug, String title, String description, Integer parent, Integer post_count,
int[] image) {
this.id = id;
this.slug = slug;
this.title = title;
this.description = description;
this.parent = parent;
this.post_count = post_count;
this.image = image;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getSlug() {
return slug;
}
public void setSlug(String slug) {
this.slug = slug;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Integer getParent() {
return parent;
}
public void setParent(Integer parent) {
this.parent = parent;
}
public Integer getPost_count() {
return post_count;
}
public void setPost_count(Integer post_count) {
this.post_count = post_count;
}
public int[] getImage() {
return image;
}
public void setImage(int[] image) {
this.image= image;
}
DataModelResponse:
public class Retrofit_ColoniesModelResponse {
#SerializedName("status")
private String status;
#SerializedName("count")
private int count;
#SerializedName("categories")
private List<Retrofit_ColoniesModel> categories;
public List<Retrofit_ColoniesModel> getCategories() {
return categories;
}
public void setCategories(List<Retrofit_ColoniesModel> categories) {
this.categories = categories;
}
public int getCount() {
return count;
}
public void setCount(int count) {
this.count = count;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
}
Retrofit code in activity:
// Retrofit //////////
Retrofit_ApiInterface apiInterface = Retrofit_ApiClient.getClient().create(Retrofit_ApiInterface.class);
Call<Retrofit_ColoniesModelResponse> call = apiInterface.getResponse();
call.enqueue(new Callback<Retrofit_ColoniesModelResponse>() {
#Override
public void onResponse(Call<Retrofit_ColoniesModelResponse> call, Response<Retrofit_ColoniesModelResponse> response) {
List<Retrofit_ColoniesModel> models = response.body().getCategories();
mAdaper = new ColoniesAdapter(context, models);
colonies_RecyclerView.setAdapter(mAdaper);
}
#Override
public void onFailure(Call<Retrofit_ColoniesModelResponse> call, Throwable t) {
}
});
//////////////////////
I want save images into Array, such as :
final int[] colImages = {
R.drawable.colonies_image_food,
R.drawable.colonies_image_medical,
R.drawable.colonies_image_tecgnolegy,
R.drawable.colonies_image_entertenement,
R.drawable.colonies_image_car,
R.drawable.colonies_image_model,
R.drawable.colonies_image_sport,
};
Adapter:
public class ColoniesAdapter extends RecyclerView.Adapter<ColoniesAdapter.ViewHolder> {
private List<Retrofit_ColoniesModel> mDateSet;
private Context mContext;
private SparseBooleanArray expandState = new SparseBooleanArray();
public ColoniesAdapter(Context context, List<Retrofit_ColoniesModel> dataSet) {
this.mContext = context;
this.mDateSet = dataSet;
for (int i = 0; i < mDateSet.size(); i++) {
expandState.append(i, false);
}
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(R.layout.colonies_row, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
holder.colonies_title.setText(mDateSet.get(position).getTitle());
holder.colonies_title.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int pos = holder.getPosition();
Retrofit_ColoniesModel model = mDateSet.get(pos);
v.getContext().startActivity(new Intent(v.getContext(), Category_page.class)
.putExtra("categoryTitle", model.getTitle())
.putExtra("categoryID", model.getId()));
}
});
Glide.with(mContext)
.load(mDateSet.get(position).getImage()[position])
.placeholder(R.drawable.post_image)
.crossFade()
.override(700, 400)
.into(holder.colonies_image);
holder.colonies_image.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int pos = holder.getPosition();
Retrofit_ColoniesModel model = mDateSet.get(pos);
v.getContext().startActivity(new Intent(v.getContext(), Category_page.class)
.putExtra("categoryTitle", model.getTitle())
.putExtra("categoryID", model.getId()));
}
});
holder.colonies_description.setText(mDateSet.get(position).getDescription());
holder.colonies_count.setText("مطالب موجود در کلونی : " + mDateSet.get(position).getPost_count());
holder.expandableLayout.setInterpolator(mDateSet.get(position).getInterpolator());
holder.expandableLayout.setExpanded(expandState.get(position));
holder.expandableLayout.setListener(new ExpandableLayoutListenerAdapter() {
#Override
public void onPreOpen() {
createRotateAnimator(holder.buttonLayout, 0f, 180f).start();
expandState.put(position, true);
}
#Override
public void onPreClose() {
createRotateAnimator(holder.buttonLayout, 180f, 0f).start();
expandState.put(position, false);
}
});
holder.buttonLayout.setRotation(expandState.get(position) ? 180f : 0f);
holder.buttonLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(final View v) {
onClickButton(holder.expandableLayout);
}
});
}
private void onClickButton(final ExpandableLayout expandableLayout) {
expandableLayout.toggle();
}
#Override
public int getItemCount() {
return mDateSet.size();
}
public void remove(int position) {
mDateSet.remove(position);
notifyItemRemoved(position);
}
public void clear() {
mDateSet.clear();
notifyDataSetChanged();
}
public void add(List<Retrofit_ColoniesModel> models) {
mDateSet.addAll(models);
notifyDataSetChanged();
}
public void update(List<Retrofit_ColoniesModel> models) {
mDateSet.clear();
mDateSet.addAll(models);
notifyDataSetChanged();
}
public static class ViewHolder extends RecyclerView.ViewHolder {
private TextView colonies_title, colonies_description, colonies_count;
private ImageView colonies_image;
private ExpandableLinearLayout expandableLayout;
private RelativeLayout buttonLayout;
public ViewHolder(View itemView) {
super(itemView);
colonies_title = (TextView) itemView.findViewById(R.id.colonies_colony_title_text);
colonies_image = (ImageView) itemView.findViewById(R.id.colonies_cover_image);
colonies_description = (TextView) itemView.findViewById(R.id.colonies_expandable_description_text);
colonies_count = (TextView) itemView.findViewById(R.id.colonies_count_title_text);
buttonLayout = (RelativeLayout) itemView.findViewById(R.id.colonies_expandable_button);
expandableLayout = (ExpandableLinearLayout) itemView.findViewById(R.id.colonies_expandable_layout);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
/* v.getContext().startActivity(new Intent(v.getContext(), PostShow_page.class)
.putExtra("title", model.getTitle())
.putExtra("image", model.getThumbnail()));*/
}
});
}
}
public ObjectAnimator createRotateAnimator(final View target, final float from, final float to) {
ObjectAnimator animator = ObjectAnimator.ofFloat(target, "rotation", from, to);
animator.setDuration(300);
animator.setInterpolator(Utils.createInterpolator(Utils.LINEAR_INTERPOLATOR));
return animator;
}
}
I don't know how can i add int[] into my constructor, because in retrofit fill the constructor with List<Retrofit_ColoniesModel> models = response.body().getCategories(); .
How can i fix my issue? I really need this tutorial, please help me. Thanks all <3

If the array of images is static (don't depend on the server) then you could just do the following:
public class Retrofit_ColoniesModel {
...
private static final int[] colImages = {
R.drawable.colonies_image_food,
R.drawable.colonies_image_medical,
R.drawable.colonies_image_tecgnolegy,
R.drawable.colonies_image_entertenement,
R.drawable.colonies_image_car,
R.drawable.colonies_image_model,
R.drawable.colonies_image_sport,
};
But if this array is not static (depends on the server response) then I suggest you to map to an array of Strings that describe each image, and the server should respond with those Strings, for example:
"images":["IMAGE1", "IMAGE2"]
And then have a helper class that could map between those string keys to the actual R.drawable resources.
Let me know if you need sample code.

Non-static Nested Classes (Inner Classes)
Non-static nested classes in Java are also called inner classes. Inner classes are associated with an instance of the enclosing class. Thus, you must first create an instance of the enclosing class to create an instance of an inner class. Here is an example inner class definition:
public class Outer {
public class Inner {
}
}
Here is how you create an instance of the Inner class:
Outer outer = new Outer();
Outer.Inner inner = outer.new Inner();
Notice how you put new after the reference to the outer class in order to create an instance of the inner class.
Non-static nested classes (inner classes) have access to the fields of the enclosing class, even if they are declared private. Here is an example of that:

Android List item displaying package name and # instead of string value

I implemented parceable class to pass some data from one activity to the other. I managed to get the rest of the items in the class. But that class has a list object i want to display in another fragment. i think the problem has to do with my adapter. kindly help me out. i have attached my fragment class and my adapter class as well.
Fragment Class
public class ForumDetailFragment extends Fragment {
private TextView titleTV;
private TextView timeTV;
private TextView dateTV;
private TextView detailsTV;
private ListView answerListView;
private LinearLayout themeLayout;
private ImageView themeIMG;
private StoredForum currentQuestion;
private AnswerAdapter adapter;
SimpleDateFormat formatDate = new SimpleDateFormat("MMM-dd-yyyy");
SimpleDateFormat formatTime = new SimpleDateFormat("HH:mm aaa");
public ForumDetailFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_forum_detail, container, false);
currentQuestion = getArguments().getParcelable(StoredForum.QUESTION_CLASS);
titleTV = (TextView) rootView.findViewById(R.id.titleTV);
timeTV = (TextView) rootView.findViewById(R.id.timeTV);
detailsTV = (TextView) rootView.findViewById(R.id.detailsTV);
answerListView = (ListView) rootView.findViewById(R.id.answerListView);
themeLayout = (LinearLayout) rootView.findViewById(R.id.eventTypeThemeLayout);
themeIMG = (ImageView) rootView.findViewById(R.id.eventTypeThemeIMG);
dateTV = (TextView) rootView.findViewById(R.id.dateTV);
titleTV.setText(currentQuestion.getTitle());
detailsTV.setText(currentQuestion.getDescription());
timeTV.setText(formatTime.format(currentQuestion.getQuestionDate()));
dateTV.setText(formatDate.format(currentQuestion.getQuestionDate()));
setupTheme();
setUpListView(rootView);
updateAnswer();
return rootView;
}
public void setUpListView(View rootView) {
answerListView = (ListView) rootView.findViewById(R.id.answerListView);
adapter = new AnswerAdapter(getActivity(), new ArrayList<Question>());
answerListView.setAdapter(adapter);
}
private void setupTheme() {
if (currentQuestion.getDescription().equals(StoredForum.FORUM_QUESTION)) {
themeLayout.setBackgroundColor(getActivity().getResources().getColor(R.color.pink));
themeIMG.setImageResource(R.drawable.abc_ic_menu_copy_mtrl_am_alpha);
} else {
themeLayout.setBackgroundColor(getActivity().getResources().getColor(R.color.orange));
themeIMG.setImageResource(R.drawable.abc_ic_menu_paste_mtrl_am_alpha);
}
}
public void updateAnswer() {
AuthUser user = AuthUser.getInstance(getActivity());
Retrofit retrofit = ApiHandle.getRetrofit(user.getToken());
QuestionService service = retrofit.create(QuestionService.class);
service.getQuestions().enqueue(new Callback<List<com.apps233.moja.packages.forum.Question>>() {
#Override
public void onResponse(Response<List<com.apps233.moja.packages.forum.Question>> response, Retrofit retrofit) {
if (response.isSuccess()) {
adapter.clear();
adapter.addAll(response.body());
adapter.notifyDataSetChanged();
}
}
#Override
public void onFailure(Throwable t) {
}
});
}
}
Adapter Class
public class AnswerAdapter extends ArrayAdapter<Question> {
List<Question> answers = new ArrayList<Question>();
public AnswerAdapter(Context context, List<Question> answers) {
super(context, R.layout.item_answer, answers);
this.answers = answers;
}
public static class ViewHolder {
private TextView titleTV;
private TextView descriptionTV;
public ViewHolder(View view) {
titleTV = (TextView) view.findViewById(R.id.titleTV);
descriptionTV = (TextView) view.findViewById(R.id.descriptionTV);
}
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
Question question = answers.get(position);
ViewHolder holder;
if (convertView == null) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.item_answer, parent, false);
holder = new ViewHolder(convertView);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.titleTV.setText("Doctor");
holder.descriptionTV.setText(question.getAnswers().toString());
return convertView;
}
}
The list is displayed in the activity below
the list is displaying the package name # some list of numbers
Question Class
public class Question {
private Long id;
private String title;
private Long userId;
private String description;
private Date questionDate;
private List<Answer> answers;
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 Long getUserId() {
return userId;
}
public void setUserId(Long userId) {
this.userId = userId;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Date getQuestionDate() {
return questionDate;
}
public void setQuestionDate(Date questionDate) {
this.questionDate = questionDate;
}
public List<Answer> getAnswers() {
return answers;
}
public void setAnswers (List<Answer> answers){
this.answers = answers;
}
}
Parceable Class
public class StoredForum implements Parcelable {
public static final String QUESTION_ID = "QUESTION_ID";
public static final String QUESTION_CLASS = "QUESTION";
public static final String FORUM_QUESTION = "forum-chat";
Long id;
Long userId;
String title;
String description;
Date questionDate;
List<Answer> answers;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public Long getUserId() {
return userId;
}
public void setUserId(Long userId) {
this.userId = userId;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Date getQuestionDate() {
return questionDate;
}
public void setQuestionDate(Date questionDate) {
this.questionDate = questionDate;
}
public List<Answer> getAnswers() {
return answers;
}
public void setAnswers(List<Answer> answers){
this.answers = answers;
}
private StoredForum() {
}
public static StoredForum fromQuestion(Question question) {
StoredForum storedForum = new StoredForum();
storedForum.setId(question.getId());
storedForum.setUserId(question.getUserId());
storedForum.setTitle(question.getTitle());
storedForum.setDescription(question.getDescription());
storedForum.setQuestionDate(question.getQuestionDate());
storedForum.setAnswers(question.getAnswers());
return storedForum;
}
protected StoredForum(Parcel in) {
id = in.readByte() == 0x00 ? null : in.readLong();
userId = in.readByte() == 0x00 ? null : in.readLong();
title = in.readString();
description = in.readString();
questionDate = new Date(in.readString());
answers = new ArrayList<Answer>();
answers = in.readArrayList(Answer.class.getClassLoader());
}
#Override
public int describeContents() {
return 0;
}
#Override
public void writeToParcel(Parcel dest, int flags) {
if (id == null) {
dest.writeByte((byte) (0x00));
} else {
dest.writeByte((byte) (0x01));
dest.writeLong(id);
}
if (userId == null) {
dest.writeByte((byte) (0x00));
} else {
dest.writeByte((byte) (0x01));
dest.writeLong(userId);
}
dest.writeString(title);
dest.writeString(description);
if(questionDate != null){
dest.writeString(questionDate.toString());
} else {
dest.writeString("0");
}
answers = new ArrayList<Answer>();
dest.writeList(answers);
}
public static final Parcelable.Creator<StoredForum> CREATOR = new Parcelable.Creator<StoredForum>() {
#Override
public StoredForum createFromParcel(Parcel in) {
return new StoredForum(in);
}
#Override
public StoredForum[] newArray(int size) {
return new StoredForum[size];
}
};
}
Answer Class
public class Answer {
Long id;
Long userId;
Long questionId;
String description;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public Long getUserId() {
return userId;
}
public void setUserId(Long userId) {
this.userId = userId;
}
public Long getQuestionId() {
return questionId;
}
public void setQuestionId(Long questionId) {
this.questionId = questionId;
}
public String getDescription() {
return description;
}
public void setDescription(String description){
this.description = description;
}
}

You need to implement/override public String toString() method in Answer class.
#Override
public String toString() {
return description;
}