I want to use GridLayout in RecyclerView and set onlickListener to every views to set texts and expand its height. The listener works but when I click one view, a view next to it is also set its text and changed its height.
When I change the column count number from 2 to 4 and then click a view, the click action changes all 4 views height and set their text.
card_item.xml.java
<?xml version="1.0" encoding="utf-8"?>
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/top_image_bottom_text_card"
android:layout_width="match_parent"
android:layout_height="200dp"
app:drawableTopCompat="#drawable/cherry_tomatoes_card_icon" />
TestFragment.java
public class TestFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_calendar, container, false);
RecyclerView mRecyclerView = rootView.findViewById(R.id.recycler_view);
CustomAdapter mCustomAdapter = new CustomAdapter();
mRecyclerView.setAdapter(mCustomAdapter);
GridLayoutManager mLayoutManager = new GridLayoutManager(getActivity(), 2);
mRecyclerView.setLayoutManager(mLayoutManager);
return rootView;
}
CustomAdapter.java
public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.ViewHolder> {
public static class ViewHolder extends RecyclerView.ViewHolder {
private final TextView textViewContainingImageOnTop;
public ViewHolder(#NonNull View itemView) {
super(itemView);
textViewContainingImageOnTop = itemView.findViewById(R.id.top_image_bottom_text_card);
}
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View cardItem = LayoutInflater.from(parent.getContext())
.inflate(R.layout.card_item, parent, false);
return new ViewHolder(cardItem);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
holder.textViewContainingImageOnTop.setOnClickListener(getOnClickListener());
holder.textViewContainingImageOnTop.setText("position: " + position);
}
private View.OnClickListener getOnClickListener() {
return view -> {
final int additionalHeight = 50;
int viewHeight = view.getHeight();
ViewGroup.LayoutParams viewLayoutParams = view.getLayoutParams();
viewLayoutParams.height = viewHeight + additionalHeight;
view.setLayoutParams(viewLayoutParams);
};
}
#Override
public int getItemCount() {
return 20;
}
}
I found this but it doesn't help me. I hope someone help me.
UPDATE
I put FrameLayout in card_item.xml like below and then when I clicked a view, it set text to the view only but it expanded itself and a view next to it both.
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/top_image_bottom_text_card"
android:layout_width="match_parent"
android:layout_height="200dp"
app:drawableTopCompat="#drawable/cherry_tomatoes_card_icon" />
</FrameLayout>
Related
My app was working completely fine , when I just had the recyclerview
in fragment's xml , but I need to wrap it in constraintlayout for
some reason but my app starts crashing after that.
error message :
*java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.*
Fragment code
public class AdminPostFragment extends Fragment {
RecyclerView recyclerView;
DatabaseReference database;
MyAdapter myAdapter;
ArrayList<Updates> list;
private FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_admin_post, container, false);
recyclerView = view.findViewById(R.id.updates_recycler);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
if (FirebaseAuth.getInstance().getCurrentUser() != null) {
FirebaseRecyclerOptions<Updates> options =
new FirebaseRecyclerOptions.Builder<Updates>()
.setQuery(FirebaseDatabase.getInstance().getReference().child("updates"), Updates.class)
.build();
myAdapter = new MyAdapter(options);
recyclerView.setAdapter(myAdapter);
myAdapter.notifyDataSetChanged();
}
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleCallback);
itemTouchHelper.attachToRecyclerView(recyclerView);
return recyclerView;
}
Fragment XML file
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
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_height="match_parent"
android:layout_width="match_parent"
android:id="#+id/parent">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/updates_recycler"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0">
</androidx.recyclerview.widget.RecyclerView>
</androidx.constraintlayout.widget.ConstraintLayout>
My Adapter code
package com.project.adminapp.adapter;
import java.util.ArrayList;
.....
public class MyAdapter extends FirebaseRecyclerAdapter< Updates ,MyAdapter.MyViewHolder> {
public MyAdapter(#NonNull FirebaseRecyclerOptions<Updates> options)
{
super(options);
}
#Override
protected void onBindViewHolder(#NonNull final MyViewHolder holder, final int position, #NonNull final Updates model) {
holder.updates_text.setText(model.getUpdate());
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.updates,parent,false);
return new MyViewHolder(v);
}
public class MyViewHolder extends RecyclerView.ViewHolder
{
TextView updates_text ;
public MyViewHolder(#NonNull View itemView) {
super(itemView);
updates_text = (TextView) itemView.findViewById(R.id.updates_text);
}
}
}
when I am using the code like:
recyclerview =
(RecyclerView) inflater.inflate(R.layout.fragment_admin_post, container, false);
getting the ClassCastException saying ConstraintLayout cannot be cast to recyclerview.
You need fix return in onCreateView
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_admin_post, container, false);
recyclerView = view.findViewById(R.id.updates_recycler);
...
return view;
}
As the ClassCastException is printing the message, you cannot cast the ConstraintLayout to RecyclerView. its because earlier, when you had only recyclerview in your fragment_admin_post.xml file the root view in that file was a recycler view that could be type casted to a RecyclerView. now that you have wrapped it in a ConstraintLayout, you may inflate the view like this:
wrappinggConstraintLayout = (ConstraintLayout) inflater.inflate(R.layout.fragment_admin_post, container, false);
if you can show more detailed code sections, it would be more understandable.
I have 6 fragments in a Sliding tab layout. All of them have RecyclerView implemented in them. I have populated the RecyclerView. But I one of the fragments does not allow me to scroll, but the rest are working fine.
See the gif below:
This is my problem
Genres.java
public class Genres extends Fragment {
private static final String TAG = "Genres";
RecyclerView recyclerView_genre;
GenresAdapter genresAdapter;
ArrayList<GenresModel> Genrelist = new ArrayList<>();
long genreId;
String genreName;
Cursor genrecursor;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.genres_activity, container, false);
recyclerView_genre = view.findViewById(R.id.recyclerView_genre);
recyclerView_genre.setHasFixedSize(true);
LinearLayoutManager genreLayout = new LinearLayoutManager(getContext());
recyclerView_genre.setLayoutManager(genreLayout);
String[] proj1 = {MediaStore.Audio.Genres.NAME, MediaStore.Audio.Genres._ID};
genrecursor=getActivity().getContentResolver().query(MediaStore.Audio.Genres.EXTERNAL_CONTENT_URI,proj1,null, null, null);
if (genrecursor != null) {
if (genrecursor.moveToFirst()) {
do {
genreId = genrecursor.getLong(genrecursor.getColumnIndexOrThrow(MediaStore.Audio.Genres._ID));
genreName = genrecursor.getString(genrecursor.getColumnIndexOrThrow(MediaStore.Audio.Genres.NAME));
GenresModel genresModel = new GenresModel(genreId,genreName );
Genrelist.add(genresModel);
Collections.sort(Genrelist, new Comparator<GenresModel>() {
#Override
public int compare(GenresModel lhs, GenresModel rhs) {
return lhs.getGenreName().compareTo(rhs.getGenreName());
}
});
} while (genrecursor.moveToNext());
}
}
genrecursor.close();
genresAdapter = new GenresAdapter(getContext(),Genrelist);
recyclerView_genre.setAdapter(genresAdapter);
genresAdapter.notifyDataSetChanged();
return view;
}
GenresAdapter.java
public class GenresAdapter extends RecyclerView.Adapter<GenresAdapter.GenresHolder> {
Context gContext;
ArrayList<GenresModel> GenreList = new ArrayList<>();
public GenresAdapter(Context gContext, ArrayList<GenresModel> genreList) {
this.gContext = gContext;
GenreList = genreList;
}
#Override
public GenresAdapter.GenresHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view3 = LayoutInflater.from(gContext).inflate(R.layout.row_genre, parent, false);
return new GenresHolder(view3);
}
#Override
public void onBindViewHolder(GenresAdapter.GenresHolder holder, int position) {
final GenresModel genresModel1 = GenreList.get(position);
holder.genreText.setText( genresModel1.getGenreName());
}
#Override
public int getItemCount() {
return GenreList.size();
}
public class GenresHolder extends RecyclerView.ViewHolder {
TextView genreText;
public GenresHolder(View itemView) {
super(itemView);
genreText = itemView.findViewById(R.id.genreText);
}
}
}
activity_genre.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="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView_genre"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="130dp"
>
</android.support.v7.widget.RecyclerView>
</LinearLayout>
row_genre.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:layout_marginLeft="10dp"
android:layout_marginStart="10dp"
android:paddingTop="35dp"
>
<TextView
android:id="#+id/genreText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#ffffff"
android:textSize="14sp"
/>
</LinearLayout>
I found out the solution myself. Actually the the problem was with the viewpager transformation. I applied https://github.com/geftimov/android-viewpager-transformers/wiki/CubeOutTransformer to my viewpager and for some reason my first 3 fragments were working and rest were not!
I am using RecyclerView in a fragment, it is generate a NullPointerException and I cannot understand the reason.
Here is my fragment activity:
public class Recharges extends Fragment {
public RecyclerView recyclerView;
private List<GetRecharge> rechargeList = new ArrayList<>();
public RecyclerView.LayoutManager layoutManager;
private RecyclerView.Adapter adapter;
ImageView image1, image2;
#Nullable #Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
Toolbar myToolbar = (Toolbar) getActivity().findViewById(R.id.my_toolbar);
((AppCompatActivity) getActivity()).setSupportActionBar(myToolbar);
View rootView = inflater.inflate(R.layout.recharges, container, false);
recyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerview1);
recyclerView.setHasFixedSize(true);
final FragmentActivity c = getActivity();
layoutManager = new LinearLayoutManager(c);
recyclerView.setLayoutManager(layoutManager);
adapter = new Adapterrecharge(rechargeList);
recyclerView.setAdapter(adapter);
prepareRechargeData();
return rootView;
}
private void prepareRechargeData() {
GetRecharge recharge = new GetRecharge("Mad Max: Fury Road" );
rechargeList.add(recharge);
adapter.notifyDataSetChanged();
}
}
Here the adapter class:
public class Adapterrecharge extends RecyclerView.Adapter<Adapterrecharge.MyViewHolder> {
private List<GetRecharge> rechargeList;
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView title;
ImageView image;
public MyViewHolder(View view) {
super(view);
title = (TextView) view.findViewById(R.id.title);
}
}
public Adapterrecharge(List<GetRecharge> rechargeList) {
this.rechargeList = rechargeList;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.rechargelist, parent, false);
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
GetRecharge recharge = rechargeList.get(position);
holder.title.setText(recharge.getTitle());
}
#Override
public int getItemCount() {
return rechargeList.size();
}
}
I seem to be inflating the correct layout but still getting the error.
here is the logcat error
java.lang.NullPointerException
at com.example.aadesh.walletuncle.Adapterrecharge.onBindViewHolder(Adapterrecharge.java:53)
at com.example.aadesh.walletuncle.Adapterrecharge.onBindViewHolder(Adapterrecharge.java:21)
here is the recyclerview item layout.
<?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="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/text"/>
here is the main layout
<?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="match_parent"
android:orientation="vertical"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.v7.widget.Toolbar
android:id="#+id/my_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:elevation="4dp"
android:theme="#style/ThemeOverlay.AppCompat.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light">
<TextView
android:text="Recharge"
android:textAppearance="#style/Base.TextAppearance.AppCompat.Large"
android:textColor="#ffffff"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textView4"
android:layout_weight="1" />
</android.support.v7.widget.Toolbar>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
android:id="#+id/recyclerview1">
</android.support.v7.widget.RecyclerView>
there are couple of problems
you are populating prepareRechargeData() list data after you have set your adapter - so your list rechargelist doesn't have any data
in your onCreateViewHolder() your are using wrong layout R.layout.rechargelist
in your view Holder you are giving wrong id for textview R.id.title
try this:
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
Toolbar myToolbar = (Toolbar) getActivity().findViewById(R.id.my_toolbar);
((AppCompatActivity) getActivity()).setSupportActionBar(myToolbar);
View rootView = inflater.inflate(R.layout.recharges, container, false);
recyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerview1);
recyclerView.setHasFixedSize(true);
final FragmentActivity c = getActivity();
layoutManager = new LinearLayoutManager(c);
recyclerView.setLayoutManager(layoutManager);
/*recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter((RecyclerView.Adapter) adapter);*/
prepareRechargeData();
adapter = new Adapterrecharge(rechargeList);
recyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
return rootView;
}
Change your adapter to:
public class Adapterrecharge extends RecyclerView.Adapter<Adapterrecharge.MyViewHolder> {
private List<GetRecharge> rechargeList;
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView title;
ImageView image;
public MyViewHolder(View view) {
super(view);
title = (TextView) view.findViewById(R.id.text);
}
}
public Adapterrecharge(List<GetRecharge> rechargeList) {
this.rechargeList = rechargeList;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.recyclerview_item_layout, parent, false);
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
GetRecharge recharge = rechargeList.get(position);
holder.title.setText(recharge.getTitle());
}
#Override
public int getItemCount() {
return rechargeList.size();
}
}
You are miss matching id of Textview.
Instead of
<?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="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/text"/>
</LinearLayout>
Use this
<?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="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/title"/>
</LinearLayout>
As you are using wrong id of Textview in MyViewHolder class.
The problem is due to mismatch ids. ID of TextView in xml ("text") and the one inflated in ViewHolder class ("title") are different.
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/text"/>
Adapter class
public MyViewHolder(View view) {
super(view);
title = (TextView) view.findViewById(R.id.title);
}
So I have this list of city objects (which contain an image, the name of the city, and a integer value). And for each of these city objects I want to programatically create a new cardView and insert it into a fragment. Currently, nothing shows up...
Here is my fragment xml code.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingTop="24dp"
android:id="#+id/fragCards_LL">
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
Here is the code for my fragment activity.
public class FragmentCards extends Fragment
{
private ArrayList<CityFolders> cityFolders = new ArrayList<>();
private OnCardsFragmentListener mListener;
private LinearLayout linearLayout;
private View view;
public FragmentCards() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
// Inflate the layout for this fragment
view = inflater.inflate(R.layout.fragment_fragment_cards, container, false);
setUpLinearLayout();
setUpCityFolders();
//TextView myText = (TextView) view.findViewById(R.id.fragCards_numberOfCardsTextContent);
//Toast.makeText(getActivity(), myText.getText(), Toast.LENGTH_SHORT).show();
return inflater.inflate(R.layout.fragment_fragment_cards, container, false);
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnCardsFragmentListener)
{
mListener = (OnCardsFragmentListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnCheeseCategoriesFragmentListener");
}
}
private void setUpLinearLayout()
{
linearLayout = (LinearLayout) view.findViewById(R.id.fragCards_LL);
linearLayout.setOrientation(LinearLayout.VERTICAL);
linearLayout.setLayoutParams(new NestedScrollView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
}
private void setUpCityFolders()
{
if(!Global_Class.getInstance().getValue().cityFoldersArrayList.isEmpty())
{
cityFolders = Global_Class.getInstance().getValue().cityFoldersArrayList;
for(CityFolders cityFolder : cityFolders)
{
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
lp.setMargins(64,64,64,64);
lp.height = 200;//180dp = 720pixels
lp.width = 1408;//330dp = 1320 pixels.
CardView cityCardView = new CardView(getActivity());// ERROR
cityCardView.setBackgroundColor(000000);
cityCardView.setLayoutParams(lp);
linearLayout.addView(cityCardView, 0);
}
}
}
public interface OnCardsFragmentListener
{
void disableCollapse();
}
}
So, don't know what I am doing wrong here... hope someone can help, maybe point out what im doing wrong?
Also, in my cardView, going horizontally, I want to have an imageview, then a textview, followed by another textview. How would I inflate those parts of the cardView and fill them with an image, and 2 texts from my cityFolder object? Hope you guys can help me with an answer!
Cheers
EDIT:
So i implemented a recycler view and..nothing shows up on the screen... This recycler view just holds simple views with each view having an imageview and a textview, and nothing shows up..
<?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="match_parent"
android:orientation="vertical"
android:paddingTop="24dp"
android:id="#+id/fragCards_LL">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/fragCards_RecyclerView">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
Here is my xml code for the view for each item in the recycler view
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="100dp"
android:layout_height="100dp"
android:src="#drawable/fullstar"
android:id="#+id/fragCardsCity_imageview"
android:layout_gravity="center_vertical"
android:padding="8dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Star City"
android:layout_gravity="center_vertical"
android:id="#+id/fragCardsCity_textView"
android:padding="8dp"/>
</LinearLayout>
And finally, here is my java code.
public class FragmentCards extends Fragment
{
private ArrayList<CityFolders> cityFolders = new ArrayList<>();
private LinearLayout linearLayout;
private View rootView;
private RecyclerView recyclerView;
private CityViewAdapter cityAdapter;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
// Inflate the layout for this fragment
rootView = inflater.inflate(R.layout.fragment_cards, container, false);
linearLayout = (LinearLayout) rootView.findViewById(R.id.fragCards_LL);
recyclerView = (RecyclerView) rootView.findViewById(R.id.fragCards_RecyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
cityAdapter = new CityViewAdapter(getActivity(),getData());
recyclerView.setAdapter(cityAdapter);
recyclerView.setItemAnimator(new DefaultItemAnimator());
return rootView;
}
public static ArrayList<myData> getData()
{
ArrayList<myData> data = new ArrayList<>();
int[] icons = {R.drawable.fullstar,R.drawable.fullstar,R.drawable.fullstar,R.drawable.fullstar};
String[] titles = {"San Francisco","Seattle","Tokyo","Osaka"};
for(int i = 0; i < titles.length && i < icons.length; i++)
{
myData current = new myData();
current.iconId = icons[i];
current.cityName = titles[i];
data.add(current);
}
return data;
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
private static class myData
{
private int iconId;
private String cityName;
}
private class CityViewAdapter extends RecyclerView.Adapter<CityViewAdapter.MyViewHolder>
{
private LayoutInflater inflater;
private ArrayList<myData> infoList = new ArrayList<>();
public CityViewAdapter(Context context, ArrayList<myData> data)
{
inflater = LayoutInflater.from(context);
this.infoList = data;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
View view = inflater.inflate(R.layout.fragment_cards_cityview,parent,false);
MyViewHolder holder = new MyViewHolder(view);//special way to avoid "findViewById everytime you make a view
return holder;
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position)
{
myData current = infoList.get(position);
holder.title.setText(current.cityName);
holder.icon.setImageResource(current.iconId);
}
#Override
public int getItemCount() {
return 0;
}
class MyViewHolder extends RecyclerView.ViewHolder
{
TextView title;
ImageView icon;
public MyViewHolder(View itemView)
{
super(itemView);
title = (TextView) itemView.findViewById(R.id.fragCardsCity_textView);
icon = (ImageView) itemView.findViewById(R.id.fragCardsCity_imageview);
}
}
}
}
So i have a fragment, which have a viewpager with tablayout, which consist of two tabs-two fragments.
The thing is, recyclerview shows empty, and i have no idea why.,
Tab Fragment LAyout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/my_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
Tag Fragment:
List<OrderListItem> orderList = new ArrayList<>();
orderList.add(new OrderListItem(333, "ABCDE", new Date(), new Date(), false, true));
adapter = new OrderListAdapter(orderList, this.getActivity());
layoutManager = new LinearLayoutManager(this.getActivity(), LinearLayoutManager.VERTICAL, false);
myRecyclerView.setLayoutManager(layoutManager);
myRecyclerView.setAdapter(adapter);
Adapter:
public class OrderListAdapter extends RecyclerView.Adapter<OrderListAdapter.ViewHolder>{
private List<OrderListItem> orderList;
#LayoutRes
private final int layoutRes;
private Context context;
private final LayoutInflater inflater;
public OrderListAdapter(List<OrderListItem> orderList, Context context){
this.orderList = orderList;
this.layoutRes = R.layout.order_list_item_layout;
this.context = context;
inflater = LayoutInflater.from(this.context);
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(layoutRes, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
final OrderListItem item = orderList.get(position);
}
public void setItems(List<OrderListItem> orderList){
this.orderList.clear();
this.orderList.addAll(orderList);
notifyDataSetChanged();
}
#Override
public int getItemCount() {
return orderList.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public ViewHolder(View itemView) {
super(itemView);
}
}
}
RecycleView Item some colorful layouts insider, so i know if the child layout is there or not, which it isnt. any idea why recyclerview is empty?
edit1: i know the recyclerview is there, because its in a lolipop phone, and if i make a movement at the recycler place it shows me the ripple top and bottom scroll border. but the child layouts are empty and blank, and should be colorful as i specificed in the child layout.
eit2. just used a listview with a simpleAdapter and it is showing. there must be something buggy with the rv
edit3: row layout (i should clearly see an empty textview with a color, besides not any value setted.)
<LinearLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:background="#color/black"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/material_deep_teal_200"
android:text="New Text"
android:id="#+id/textView" />
</LinearLayout>
Change:
android:layout_width="match_parent"
android:layout_height="match_parent"
to
android:layout_width="50dp" // set yourself
android:layout_height="50dp" // set yourself
Where is the logic in which you set OrderListItem properties to ui?
You have first to set ViewHolder components:
public static class ViewHolder extends RecyclerView.ViewHolder {
TextView mTitleTv;
public ViewHolder(View itemView) {
super(itemView);
mTitle = itemView.findViewById(R.id.textview_id_in_your_xml_file);
}
}
And then set them in onBindViewHolder:
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
final OrderListItem item = orderList.get(position);
holder.mTitleTv.setText(item.getReplaceThisWithAStringProperty);
}
EDIT
If you have to use default LinearLayoutManager properties use this constructor:
layoutManager = new LinearLayoutManager(getActivity());
Instead of this:
layoutManager = new LinearLayoutManager(this.getActivity(), LinearLayoutManager.VERTICAL, false);
Add also fixed size property for RecyclerView:
recyclerView.setHasFixedSize = true;