Develop Reference

Dynamic Tabs with dynamic data in viewpager fragment

I need a help. I am developing dynamic tabs with dynamic data in viewpager fragment's list. Somehow i got the dynamic tabs and hit API in placeholder fragment to get the recyclerview list.
there are two issue. 1. design is overlapping the tabs and 2. its loading 3rd id data first.
here is the code.
here is main class
public class NewsFeed extends Fragment {
private static RecyclerView listView;
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
private TabLayout tabLayout;
private ViewPager viewPager;
private RecyclerView recyclerView;
private ApiInterface apiInterface;
private List<BlogCatData> list = new ArrayList<BlogCatData>();
private BlogCatListAdaptor adapter;
private String item;
private ArrayList<BlogCatData> dataModelList = new ArrayList<BlogCatData>();
private ArrayList<String> CatTitleList = new ArrayList<>();
private static ArrayList<String> CatIdList = new ArrayList<>();
private View view1;
private View v;
// private ArrayAdapter<BlogCatData> adapter;
public NewsFeed() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
v = inflater.inflate(R.layout.fragment_news_feed, container, false);
getAllBlogCat();
return v;
}
private void setViewIDs() {
tabLayout = v.findViewById(R.id.tabs);
viewPager = v.findViewById(R.id.container);
setUpViewPager(viewPager);
tabLayout.setupWithViewPager(viewPager);
}
private void getAllBlogCat() {
// avi.show();
apiInterface = APIClient.getClient().create(ApiInterface.class);
Call<BlogCatModel> call = apiInterface.GETBlogCategory();
call.enqueue(new Callback<BlogCatModel>() {
#Override
public void onResponse(Call<BlogCatModel> call, retrofit2.Response<BlogCatModel> response) {
if (response.isSuccessful()) {
CatIdList.clear();
list = response.body().getDATA();
for (int i = 0; i < list.size(); i++) {
CatTitleList.add(list.get(i).getTITLE());
CatIdList.add(list.get(i).getID());
}
Log.v("CatTitle", CatTitleList.toString());
Log.v("CatId", CatIdList.toString());
setViewIDs();
// adapter.setPostList(list)
} else {
try {
JSONObject jObjError = new JSONObject(response.errorBody().string());
Toast.makeText(getApplicationContext(), jObjError.getString("message"), Toast.LENGTH_LONG).show();
} catch (Exception e) {
Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_LONG).show();
}
}
}
#Override
public void onFailure(Call<BlogCatModel> call, Throwable t) {
Toast.makeText(getApplicationContext(), t.toString(), Toast.LENGTH_SHORT).show();
call.cancel();
}
});
}
private void setUpViewPager(ViewPager viewPager) {
SectionsPagerAdapter sectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
for (int i = 0; i < CatTitleList.size(); i++) {
Bundle bundle = new Bundle();
bundle.putString("id", CatIdList.get(i));
PlaceholderFragment categoryList = new PlaceholderFragment();
categoryList.setArguments(bundle);
sectionsPagerAdapter.addFragment(categoryList, CatTitleList.get(i));
}
sectionsPagerAdapter.notifyDataSetChanged();
viewPager.setAdapter(sectionsPagerAdapter);
}
public static class PlaceholderFragment extends Fragment {
private final static String TAG = PlaceholderFragment.class.getSimpleName();
private static String item;
private static ArrayList<String> dataModelList = new ArrayList<String>();
// private ArrayAdapter<Model> adapter;
private RecyclerView listView;
private List<BlogData> dataList = new ArrayList<>();
private BlogListAdaptor blogListAdaptor;
private static String id;
public PlaceholderFragment() {
}
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
id = CatIdList.get(sectionNumber);
Bundle args = new Bundle();
args.putString("ID", id);
fragment.setArguments(args);
return fragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment__newsfeed_placeholder, container, false);
listView = view.findViewById(R.id.recycler_view);
getBlog(Id);
setBlog();
return view;
}
private void getBlog(String id) {
ApiInterface apiInterface = APIClient.getClient().create(ApiInterface.class);
Call<BlogModel> call = apiInterface.getNewsByCategory(id);
call.enqueue(new Callback<BlogModel>() {
#Override
public void onResponse(Call<BlogModel> call, retrofit2.Response<BlogModel> response) {
if (response.isSuccessful()) {
dataList = response.body().getDATA();
blogListAdaptor.setPostList(dataList);
} else {
try {
JSONObject jObjError = new JSONObject(response.errorBody().string());
Toast.makeText(getApplicationContext(), jObjError.getString("message"), Toast.LENGTH_LONG).show();
} catch (Exception e) {
Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_LONG).show();
}
}
}
#Override
public void onFailure(Call<BlogModel> call, Throwable t) {
Toast.makeText(getApplicationContext(), t.toString(), Toast.LENGTH_SHORT).show();
call.cancel();
}
});
}
private void setBlog() {
blogListAdaptor = new BlogListAdaptor(getActivity(), dataList);
listView.setAdapter(blogListAdaptor);
listView.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
listView.setLayoutManager(linearLayoutManager);
}
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return PlaceholderFragment.newInstance(position + 0);
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public int getCount() {
return mFragmentTitleList.size();
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
}
return mFragmentTitleList.get(position);
}
#Override
public int getItemPosition(Object object) {
return super.getItemPosition(object);
}
}
}
and here is the adapter class for recyclerview
public class BlogListAdaptor extends RecyclerView.Adapter<BlogListAdaptor.MyViewHlder> {
private Activity activity;
private List<BlogData> list;
private boolean valid;
private EditText name, email, phone, date, noOfGuest, msg;
private Spinner partyMode, timeSlot;
private AlertDialog alertDialog;
final Calendar myCalendar = Calendar.getInstance();
private String PartyModeStr, TimeSlotStr;
private String Id;
private String title;
public BlogListAdaptor(Activity activity, List<BlogData> list) {
this.activity = activity;
this.list = list;
}
public void setPostList(List<BlogData> dataList) {
list = dataList;
notifyDataSetChanged();
}
#NonNull
#Override
public MyViewHlder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.blog_list_layout, viewGroup, false);
MyViewHlder my = new MyViewHlder(view);
return my;
}
#Override
public void onBindViewHolder(#NonNull MyViewHlder myViewHlder, int i) {
myViewHlder.Title.setText(list.get(i).getTITLE());
myViewHlder.Author.setText(list.get(i).getAUTHOR());
if (list.get(i).getIMGSRC() != null)
Glide.with(activity).load(Constant.ImgRoot + list.get(i).getIMGSRC())
.into(myViewHlder.Image);
myViewHlder.cardview.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(activity, DetailActivity.class);
intent.putExtra("Id", list.get(i).getID());
intent.putExtra("Title", list.get(i).getTITLE());
intent.putExtra("Author", list.get(i).getAUTHOR());
intent.putExtra("Content", list.get(i).getCONTENT());
activity.startActivity(intent);
}
});
}
#Override
public int getItemCount() {
return list.size();
}
class MyViewHlder extends RecyclerView.ViewHolder {
private TextView Title, Author;
private ImageView Image;
private CardView cardview;
public MyViewHlder(#NonNull View itemView) {
super(itemView);
Image = itemView.findViewById(R.id.image);
Title = itemView.findViewById(R.id.title);
Author = itemView.findViewById(R.id.author);
cardview = itemView.findViewById(R.id.cardview);
}
}
}
Please help me out, to call api...
fragment_newsfeed_placeholder
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
fragment_news_feed
<com.google.android.material.tabs.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
app:tabGravity="center"
app:tabMode="scrollable"
app:tabTextColor="#ffffff" />
<androidx.viewpager.widget.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/tabs" />

RecyclerView doesn't display any item view at load

I am retrieving JSON data and parcing it by Retrofit. I want to display it on RecyclerView but can't make it display the views. Where am I doing it wrong? Here MainActivity, Model and ListFlowerAdapter are given
public class MainActivity extends AppCompatActivity {
private ListFlowerAdapter mListFlowerAdapter;
private RecyclerView mRecyclerView;
private RetrofitClient mRetrofitClient;
LinearLayoutManager linearLayoutManager;
//private List<FlowerModel> myFlowers;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
configViews();
mRetrofitClient = new RetrofitClient();
Call<List<FlowerModel>> listCall = mRetrofitClient.getFlowerService().getAllFlowers();
listCall.enqueue(new Callback<List<FlowerModel>>() {
#Override
public void onResponse(Call<List<FlowerModel>> call, Response<List<FlowerModel>> response) {
if (response.isSuccessful()) {
List<FlowerModel> flowerList = response.body();
for (int i = 0; i < flowerList.size(); i++) {
FlowerModel flowerModel = flowerList.get(i);
mListFlowerAdapter.addFlower(flowerModel);
}
} else {
int sc = response.code();
switch (sc) {
}
}
}
#Override
public void onFailure(Call<List<FlowerModel>> call, Throwable t) {
}
});
}
private void configViews() {
mRecyclerView = findViewById(R.id.recycler_view);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setRecycledViewPool(new RecyclerView.RecycledViewPool());
linearLayoutManager = new LinearLayoutManager(this);
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(linearLayoutManager);
mListFlowerAdapter = new ListFlowerAdapter();
mRecyclerView.setAdapter(mListFlowerAdapter);
//mRecyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext(),LinearLayoutManager.VERTICAL,false));
//mListFlowerAdapter = new ListFlowerAdapter();
// mRecyclerView.setAdapter(mListFlowerAdapter);
}
}
ListFlowerAdapter class
public class ListFlowerAdapter extends RecyclerView.Adapter<ListFlowerAdapter.MyViewHolder> {
private static final String TAG = ListFlowerAdapter.class.getSimpleName();
private Context context;
private List<FlowerModel> myFlowers;
public ListFlowerAdapter() {
myFlowers = new ArrayList<>();
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View row = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_item, null, false);
return new MyViewHolder(row);
}
#Override
public void onBindViewHolder(#NonNull MyViewHolder holder, int position) {
FlowerModel currFlower = myFlowers.get(position);
holder.mName.setText(currFlower.getName());
holder.mPrice.setText(Double.toString(currFlower.getPrice()));
Picasso.with(holder.itemView.getContext()).load("http://services.hanselandpetal.com/photos/" + currFlower.getPhoto()).into(holder.mPhoto);
}
#Override
public int getItemCount() {
return myFlowers.size();
}
public void addFlower(FlowerModel flowerModel) {
myFlowers.add(flowerModel);
notifyDataSetChanged();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
private ImageView mPhoto;
private TextView mName, mPrice;
public MyViewHolder(View itemView) {
super(itemView);
mPhoto = itemView.findViewById(R.id.flower_photo);
mName = itemView.findViewById(R.id.flower_name);
mPrice = itemView.findViewById(R.id.flower_price);
}
}
}
FlowerModel class
public class FlowerModel implements Serializable {
#Expose
private String category;
#Expose
private String price;
#Expose
private String instructions;
#Expose
private String photo;
#Expose
private String name;
#Expose
private int productId;
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public double getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
public String getInstructions() {
return instructions;
}
public void setInstructions(String instructions) {
this.instructions = instructions;
}
public String getPhoto() {
return photo;
}
public void setPhoto(String photo) {
this.photo = photo;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getProductId() {
return productId;
}
public void setProductId(int productId) {
this.productId = productId;
}
}
XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp"
android:orientation="horizontal">
<ImageView
android:id="#+id/flower_photo"
android:layout_width="150dp"
android:layout_height="150dp"
android:background="#mipmap/ic_launcher"
android:scaleType="centerCrop" />
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/flower_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="#style/Base.TextAppearance.AppCompat.Large"
android:text="Large Text" />
<TextView
android:id="#+id/flower_price"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="#style/Base.TextAppearance.AppCompat.Medium"
android:text="Medium Text" />
</LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="16dp"
tools:context=".MainActivity">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Stop Downloading" />
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none"
android:visibility="visible" />
Could you help me with the issue, please? Thank you very much.

Don't notify your adapter recursively,
Your code :
for (int i = 0; i < flowerList.size(); i++) {
FlowerModel flowerModel = flowerList.get(i);
mListFlowerAdapter.addFlower(flowerModel); // Called from here
}
Code from adapter
public void addFlower(FlowerModel flowerModel) {
myFlowers.add(flowerModel);
notifyDataSetChanged(); // Notifying everytime
}
Instead, you should add all data to adapter and notify only once : (Updated code)
for (int i = 0; i < flowerList.size(); i++) {
FlowerModel flowerModel = flowerList.get(i);
mListFlowerAdapter.addFlower(flowerModel);
}
mListFlowerAdapter.notifyDataSetChanged(); // Notify like this
Code from adapter
public void addFlower(FlowerModel flowerModel) {
myFlowers.add(flowerModel);
//notifyDataSetChanged(); Remove from here
}

Pass activity context to the adapter and use that context for populating item on list view.
private Context mContext;
public ListFlowerAdapter(Context context) {
myFlowers = new ArrayList<>();
this.mContext = context;
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View row = LayoutInflater.from(mContext).inflate(R.layout.row_item, parent, false);
return new MyViewHolder(row);
}
From activity send the activity context for initializing the adapter like this
mListFlowerAdapter = new ListFlowerAdapter(this);
And for adding a new item
public void addFlowers(List<FlowerModel> flowerModels) {
for (int i = 0; i < flowerModels.size(); i++) {
FlowerModel flowerModel = flowerModels.get(i);
myFlowers.add(flowerModel);
}
notifyDataSetChanged();
}
And successful response just send the list for updating the adapter
List<FlowerModel> flowerList = response.body();
mListFlowerAdapter.addFlowers(flowerList);
Hope this will help.

Try to remove this line:
mRecyclerView.setHasFixedSize(true);
And add this in the XML file:
android:fillViewport="true"
Without that line, your RecyclerView content initial height is 0 (empty list), and with the fixed size it can't grow although you add items to the adapter.

Android - CardView doesn't show up on RecyclerView connected to Firebase

I'm building a RecyclerView in a Fragment, which brings in data from Firebase database and suppose to show them on a CardView. I wrote all the code as shown below but all that appears upon running is an empty RecyclerView Fragment with the method getItemCount() returning always 0.
card_item.xml
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/cardView"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_margin="10dp"
android:orientation="horizontal"
card_view:cardCornerRadius="5dp"
card_view:cardElevation="5dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorPrimary">
<TextView
android:id="#+id/primaryText"
android:layout_width="300dp"
android:layout_height="60dp"
android:textColor="#color/colorPrimary"
android:textSize="24sp" />
<TextView
android:id="#+id/subText"
android:layout_width="300dp"
android:layout_height="60dp"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:textColor="#color/colorPrimary"
android:textSize="14sp" />
<TextView
android:id="#+id/rateValue"
android:layout_width="300dp"
android:layout_height="60dp"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="#+id/subText"
android:textColor="#color/colorPrimary"
android:textSize="24sp" />
</RelativeLayout>
fragment_profile.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#F1F1F1"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="#+id/placesRecycler"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
PlacesModel.java
public class PlaceModel {
private String mPrimaryText, mSubText, mRateValue;
public PlaceModel() {
}
public PlaceModel(String mCardImage, String mPrimaryText,
String mSubText, String mRateValue) {
//this.mCardImageURL = mCardImage;
this.mPrimaryText = mPrimaryText;
this.mSubText = mSubText;
this.mRateValue = mRateValue;
}
public void setmPrimaryText(String mPrimaryText) {
this.mPrimaryText = mPrimaryText;
}
public void setmSubText(String mSubText) {
this.mSubText = mSubText;
}
public void setmRateValue(String mRateValue) {
this.mRateValue = mRateValue;
}
public String getmPrimaryText() {
return mPrimaryText;
}
public String getmSubText() {
return mSubText;
}
public String getmRateValue() {
return mRateValue;
}}
PlacesAdapter.java
public class PlacesAdapter extends RecyclerView.Adapter<PlacesAdapter.PlacesViewHolder> {
private ArrayList<PlaceModel> cardContents;
private Context context;
public PlacesAdapter(Context context, ArrayList<PlaceModel> cardContents) {
this.cardContents = cardContents;
this.context = context;
}
#Override
public PlacesViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.card_item, parent, false);
return new PlacesViewHolder(view);
}
#Override
public void onBindViewHolder(PlacesViewHolder holder, int position) {
PlaceModel place = cardContents.get(position);
holder.primaryText.setText(place.getmPrimaryText());
holder.subText.setText(place.getmSubText());
holder.rateValue.setText(place.getmRateValue());
}
#Override
public int getItemCount() {
return cardContents.size();
}
public class PlacesViewHolder extends RecyclerView.ViewHolder {
CardView cardView;
public TextView primaryText, subText, rateValue;
public PlacesViewHolder(View itemView) {
super(itemView);
cardView = (CardView) itemView.findViewById(R.id.cardView);
primaryText = (TextView) itemView.findViewById(R.id.primaryText);
subText = (TextView) itemView.findViewById(R.id.subText);
rateValue = (TextView) itemView.findViewById(R.id.rateValue);
}
}}
FirebaseConnector.java
public class FirebaseConnector {
DatabaseReference db;
PlaceModel placeModel = new PlaceModel();
ArrayList<PlaceModel> cardContent = new ArrayList<>();
public FirebaseConnector(DatabaseReference db) {
this.db = db;
}
public ArrayList<PlaceModel> retrieve() {
db.addChildEventListener(new ChildEventListener() {
#Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
fetchData(dataSnapshot);
}
#Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
fetchData(dataSnapshot);
}
#Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
#Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
return cardContent;
}
private void fetchData(DataSnapshot dataSnapshot) {
cardContent.clear(); //clear card content from last usage
for (DataSnapshot ds : dataSnapshot.getChildren()) {
placeModel = ds.child("Place Model").getValue(PlaceModel.class);
cardContent.add(placeModel);
}
}}
ProfileFragment.java
public class ProfileFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
/////////////////////////////////////////////////////////////
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
private RecyclerView placesRecycler;
private PlacesAdapter placesAdapter;
private FirebaseConnector connector;
private DatabaseReference ref;
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public ProfileFragment() {
// Required empty public constructor
}
// TODO: Rename and change types and number of parameters
public static ProfileFragment newInstance(String param1, String param2) {
ProfileFragment fragment = new ProfileFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_profile, container, false);
mAuth = FirebaseAuth.getInstance();
//Initialize Database..
ref = FirebaseDatabase.getInstance().getReference();
connector = new FirebaseConnector(ref);
//Initialize RecyclerView
placesRecycler = (RecyclerView)v.findViewById(R.id.placesRecycler);
placesRecycler.setLayoutManager(new LinearLayoutManager(this.getActivity()));
//Adapter
placesAdapter = new PlacesAdapter(this.getActivity(), connector.retrieve());
placesRecycler.setAdapter(placesAdapter);
Toast.makeText(getActivity(), "We have "+placesAdapter.getItemCount()+" cards", Toast.LENGTH_LONG).show();
return v;
}
#Override
public void onStart() {
super.onStart();
if (mAuth.getCurrentUser() == null) {
startActivity(new Intent(getActivity(), LoginActivity.class));
}
}
public void updateUI() {
if (mAuth.getCurrentUser() == null) {
startActivity(new Intent(getActivity(), LoginActivity.class));
}
}}
Database trial structure
Database trial structure

I see that retrieve method will return empty array list because it won't wait for the listener to finish (note that listener works in another thread)
You may make move the listener to the profile fragment and every time you update the ArrayList write
placesRecycler.notifydatasetchanged();

RecyclerView having trouble displaying Empty case

I am trying to display an Empty view in an app that displays movie posters. I am using a recyclerview - for example when I put my device in flight mode and click refresh I was expecting the app to display the empty state view but this is not the case.
The posters are still displayed in the Activity. Why is this the case?
The data is from the moviedatabase api & I am retrieving a movie title & relative image path
MAIN ACTIVITY
public class MainActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<List<Movie>> {
private static final String LOG_TAG = MainActivity.class.getSimpleName();
private static final int LOADER_ID = 1;
private MovieAdapter mMovieAdapter;
private RecyclerView mRecyclerView;
private GridLayoutManager mGridLayoutManager;
private LoaderManager mLoaderManager;
private View mLoadingIndicator;
private TextView mEmptyTextView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mLoadingIndicator = findViewById(R.id.loadingIndicator);
mEmptyTextView = (TextView) findViewById(R.id.emptyStateTextView);
mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);
mLoadingIndicator.setVisibility(View.VISIBLE);
mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);
mGridLayoutManager = new GridLayoutManager(this, 2);
mRecyclerView.setLayoutManager(mGridLayoutManager);
mMovieAdapter = new MovieAdapter();
mRecyclerView.setAdapter(mMovieAdapter);
mLoaderManager = getSupportLoaderManager();
mLoaderManager.initLoader(LOADER_ID, null, this);
}
public void showMovieDataView() {
mEmptyTextView.setVisibility(View.INVISIBLE);
mRecyclerView.setVisibility(View.VISIBLE);
}
public void showErrorMessage() {
mRecyclerView.setVisibility(View.INVISIBLE);
mEmptyTextView.setVisibility(View.VISIBLE);
}
#Override
public Loader<List<Movie>> onCreateLoader(int id, Bundle args) {
return new MovieLoader(this, TmdbUrlUtils.BASE_URL);
}
#Override
public void onLoadFinished(Loader<List<Movie>> loader, List<Movie> data) {
mLoadingIndicator.setVisibility(View.INVISIBLE);
if (data == null) {
showErrorMessage();
} else {
showMovieDataView();
mMovieAdapter.setMovieData(data);
}
}
#Override
public void onLoaderReset(Loader<List<Movie>> loader) {
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main_menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id) {
case R.id.refresh:
mLoadingIndicator.setVisibility(View.VISIBLE);
mMovieAdapter.setMovieData(null);
getSupportLoaderManager().restartLoader(LOADER_ID, null, this);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
ADAPTER CLASS
public class MovieAdapter extends RecyclerView.Adapter<MovieAdapter.ViewHolder> {
List<Movie> mMovieList;
public static final String BASE_POSTER_URL = "http://image.tmdb.org/t/p/w185";
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
ViewHolder vh = new ViewHolder(v);
return vh;
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
Context context = holder.mImageView.getContext();
String imagePath = mMovieList.get(position).getmPosterPath();
Uri baseUri = Uri.parse(BASE_POSTER_URL);
Uri.Builder builder = baseUri.buildUpon();
builder.appendEncodedPath(imagePath);
String imageUrl = builder.toString();
Picasso.with(context).load(imageUrl).into(holder.mImageView);
}
#Override
public int getItemCount() {
if (null == mMovieList) return 0;
return mMovieList.size();
}
public void setMovieData(List<Movie> data) {
mMovieList = data;
this.notifyDataSetChanged();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public ImageView mImageView;
public ViewHolder(View itemView) {
super(itemView);
mImageView = (ImageView) itemView.findViewById(R.id.imagePoster);
}
}
}
ACTIVITY_MAIN XML
<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"
android:background="#f48fb1"
tools:context="com.example.android.cinemate.MainActivity">
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#d4e157">
</android.support.v7.widget.RecyclerView>
<ProgressBar
android:id="#+id/loadingIndicator"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:visibility="invisible"/>
<TextView
android:id="#+id/emptyStateTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="#f44336"
android:text="No network detected!"
android:visibility="invisible"/>
</FrameLayout>
CUSTOM OBJECT
public class Movie implements Parcelable {
public static final Creator<Movie> CREATOR = new Creator<Movie>() {
#Override
public Movie createFromParcel(Parcel in) {
return new Movie(in);
}
#Override
public Movie[] newArray(int size) {
return new Movie[size];
}
};
private String mTitle;
private String mPosterPath;
public Movie(String title, String posterPath) {
this.mTitle = title;
this.mPosterPath = posterPath;
}
protected Movie(Parcel in) {
mTitle = in.readString();
mPosterPath = in.readString();
}
public String getmTitle() {
return mTitle;
}
public void setmTitle(String mTitle) {
this.mTitle = mTitle;
}
public String getmPosterPath() {
return mPosterPath;
}
public void setmPosterPath(String mPosterPath) {
this.mPosterPath = mPosterPath;
}
#Override
public int describeContents() {
return 0;
}
#Override
public void writeToParcel(Parcel parcel, int i) {
parcel.writeString(mTitle);
parcel.writeString(mPosterPath);
}
}
This is a LOG of what gets called when flight mode is on:
Refresh selected with Flight Mode on
TEST......MainActivity onCreateLoader() called
TEST.......MovieLoader loadInBackground() called
TEST.......NetworkUtils getDataFromNetwork() called
TEST.......NetworkUtils createUrl() called
TEST.......NetworkUtils makeHttpRequest() called
TEST.......MovieJsonUtils parseJson() called
TEST......MainActivity onLoadFinished() called
TEST......MainActivity showMovieData() called

RecyclerView with SearchView will not populate upon initialization

I am currently using searchView to filter results on a RecyclerView. The problem is when the fragment is initialized, the list won't appear not until I click on the search icon on the toolbar and type some texts on it. I've tried modifying the codes. Take a look specifically at the adapter and holder classes, if you'll try to exchange my current codes to these:
public MembershipActivationAdapter(Context context, List<Member> members){
this.context = context;
this.mMembers = members;
}
and
#Override
public MembershipActivationViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
final View itemView = LayoutInflater.from(context).inflate(R.layout.member_activation_content, viewGroup, false);
}
,it will show the list upon calling the fragment however if I'll type something on the SearchView, it seems to function only as a one way filter. It will filter names but whenever I'll try to remove a character or a text on the searchview, it won't show the list back. Please help me with this. These are my codes:
Adapter & ViewHolder class:
public class MembershipActivationAdapter extends RecyclerView.Adapter<MembershipActivationAdapter.MembershipActivationViewHolder> {
private final List<Member> mMembers;
private final LayoutInflater inflater;
//private final Context context;
public MembershipActivationAdapter(Context context, List<Member> members){
inflater = LayoutInflater.from(context);
mMembers = new ArrayList<>(members);
//this.context = context;
//this.mMembers = members;
}
#Override
public int getItemCount() {
return mMembers.size();
}
#Override
public void onBindViewHolder(MembershipActivationViewHolder holder, final int position) {
final Member m = mMembers.get(position);
holder.name.setText(m.getName());
holder.email.setText(m.getEmail());
if(m.getStatus().equals("Active")){
holder.status.setText(Html.fromHtml("<font color='#00CD00'>" + m.getStatus() + "</font>"));
}else{
holder.status.setText(Html.fromHtml("<font color='#ff0000'>" + m.getStatus() + "</font>"));
}
}
#Override
public MembershipActivationViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
final View itemView = inflater.inflate(R.layout.member_activation_content, viewGroup, false);
return new MembershipActivationViewHolder(itemView);
//final View itemView = LayoutInflater.from(context).inflate(R.layout.member_activation_content, viewGroup, false);
}
public static class MembershipActivationViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public final TextView name;
public final TextView email;
public final TextView status;
public MembershipActivationViewHolder(View v) {
super(v);
v.setOnClickListener(this);
name = (TextView) v.findViewById(R.id.member_name);
email = (TextView) v.findViewById(R.id.member_email);
status = (TextView) v.findViewById(R.id.member_status);
}
}
public List<Member> getMemberList() {
return mMembers;
}
public void animateTo(List<Member> members) {
applyAndAnimateRemovals(members);
applyAndAnimateAdditions(members);
applyAndAnimateMovedItems(members);
}
private void applyAndAnimateRemovals(List<Member> newMembers) {
for (int i = mMembers.size() - 1; i >= 0; i--) {
final Member member = mMembers.get(i);
if (!newMembers.contains(member)) {
removeItem(i);
}
}
}
private void applyAndAnimateAdditions(List<Member> newMembers) {
for (int i = 0, count = newMembers.size(); i < count; i++) {
final Member member = newMembers.get(i);
if (!mMembers.contains(member)) {
addItem(i, member);
}
}
}
private void applyAndAnimateMovedItems(List<Member> newMembers) {
for (int toPosition = newMembers.size() - 1; toPosition >= 0; toPosition--) {
final Member member = newMembers.get(toPosition);
final int fromPosition = mMembers.indexOf(member);
if (fromPosition >= 0 && fromPosition != toPosition) {
moveItem(fromPosition, toPosition);
}
}
}
public Member removeItem(int position) {
final Member member = mMembers.remove(position);
notifyItemRemoved(position);
return member;
}
public void addItem(int position, Member member) {
mMembers.add(position, member);
notifyItemInserted(position);
}
public void moveItem(int fromPosition, int toPosition) {
final Member member = mMembers.remove(fromPosition);
mMembers.add(toPosition, member);
notifyItemMoved(fromPosition, toPosition);
}
}
Fragment Class:
public class MembershipActivationFragment extends Fragment implements SearchView.OnQueryTextListener{
private static String url = "http://www.xxxxx.org/portal/webservices/get_members.php";
private List<Member> memberList;
private RecyclerView recyclerView;
private MembershipActivationAdapter adapter;
private String pid;
private ProgressDialog progressDialog;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.member_activation, container, false);
recyclerView = (RecyclerView) rootView.findViewById(R.id.members_recycler_view);
setHasOptionsMenu(true);
memberList = new ArrayList<>();
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
progressDialog = new ProgressDialog(getActivity());
progressDialog.setMessage("Loading...");
progressDialog.show();
populate();
return rootView;
}
public void populate(){
JsonArrayRequest request = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray jsonArray) {
hidePDialog();
String name, email, status;
Member member;
for(int i = 0; i < jsonArray.length(); i++) {
try {
JSONObject object = jsonArray.getJSONObject(i);
name = object.getString("firstname") + " " + object.getString("lastname");
email = object.getString("email");
if(Integer.parseInt(object.getString("activated"))==1){
status = "Active";
}else{
status = "Not Active";
}
member = new Member(name, email, status);
memberList.add(member);
} catch (Exception e) {
}
}
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener(){
#Override
public void onErrorResponse(VolleyError volleyError) {
volleyError.printStackTrace();
}
});
AppController.getInstance().addToRequestQueue(request);
adapter = new MembershipActivationAdapter(getActivity(), memberList);
recyclerView.setAdapter(adapter);
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.search_menu, menu);
final MenuItem item = menu.findItem(R.id.action_search);
final SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
searchView.setOnQueryTextListener(this);
}
#Override
public boolean onQueryTextChange(String query) {
final List<Member> filteredMemberList = filter(memberList, query);
adapter.animateTo(filteredMemberList);
recyclerView.scrollToPosition(0);
return true;
}
#Override
public boolean onQueryTextSubmit(String query) {
return false;
}
private List<Member> filter(List<Member> members, String query) {
query = query.toLowerCase();
final List<Member> filteredModelList = new ArrayList<>();
for (Member member : members) {
final String text = member.getName().toLowerCase();
if (text.contains(query)) {
filteredModelList.add(member);
}
}
return filteredModelList;
}
private void hidePDialog() {
if (progressDialog != null) {
progressDialog.dismiss();
progressDialog = null;
}
}
}
RecyclerView container xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/members_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"/>
</LinearLayout>
Content class:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:padding="5dip">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Name here"
android:textStyle="bold"
android:id="#+id/member_name"
android:layout_centerVertical="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="email#gmail.com"
android:id="#+id/member_email"
android:layout_below="#+id/member_name"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="email#gmail.com"
android:id="#+id/member_status"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"/>
</RelativeLayout>
</LinearLayout>
Model Class:
public class Member {
private String name;
private String email;
private String status;
public Member(String name, String email, String status) {
this.name = name;
this.email = email;
this.status = status;
}
public Member(String name){
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
}

Atlast! I was able to find the resolution for this. Kudos to the developer himself, Xaver Kapeller!
public void populate(){
JsonArrayRequest request = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray jsonArray) {
// hidePDialog();
String email, status;
// Member member;
for(int i = 0; i < jsonArray.length(); i++) {
try {
JSONObject object = jsonArray.getJSONObject(i);
final String name = object.getString("firstname") + " " + object.getString("lastname");
email = object.getString("email");
if(Integer.parseInt(object.getString("activated"))==1){
status = "Active";
}else{
status = "Not Active";
}
mModels.add(new ExampleModel(name));
// member = new Member(name, email, status);
} catch (Exception e) {
}
}
mAdapter = new ExampleAdapter(getActivity(), mModels);
mRecyclerView.setAdapter(mAdapter);
}
}, new Response.ErrorListener(){
#Override
public void onErrorResponse(VolleyError volleyError) {
volleyError.printStackTrace();
}
});
AppController.getInstance().addToRequestQueue(request);
}
Just tranfer these two lines of code inside onResponse() and everything will work perfectly fine:
mAdapter = new ExampleAdapter(getActivity(), mModels);
mRecyclerView.setAdapter(mAdapter);