Loading images from the custom video gallery

Loading images from the custom video gallery - android

I'm working on a page in which I have a button which takes you to the video gallery which I have created. From this you select some videos(thumbnails) and then hit the arrow to come back to the same place from where I hit the button to come to the Custom gallery with the selected videos.
Basically the map goes like this :
Button(from AddFragment)->VideoGallery->Select videos-> AddFragment with selected videos which is visible inside the recycler view
Now when I hit the button I come to my videogallery but when I select some videos from the gallery and come back to the AddFragment it shows nothing and one error comes up that is E/RecyclerView: No adapter attached; skipping layout
Now I have used Bundle to extract the sent data and populate it in my AddFragment.
I'm giving out the code for you :
1. AddFragment.java
public class AddFragment extends Fragment {
private ImageButton nextActivity;
private RecyclerView recyclerView;
private ProgressDialog videoProgressDialog;
ArrayList<File> checkedList = new ArrayList<>();
ImageAdapter imageAdapter;
Button button;
public AddFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_add, container, false);
nextActivity = (ImageButton) view.findViewById(R.id.gotoButton);
recyclerView = (RecyclerView) view.findViewById(R.id.grid_add_view);
button = (Button) view.findViewById(R.id.buttonToGallery);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent(getContext(),VideoGalleryActivity.class));
}
});
return view;
}
//making adapter for RecyclerView which loads the desired files
class ImageAdapter extends RecyclerView.Adapter<ViewHolder>{
private LayoutInflater mInflater;
private Bitmap bitmap;
private ArrayList<File> fileName;
public ImageAdapter(ArrayList<File> checkedList) {
fileName = checkedList;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Log.e("ADAPTER SETTING","DOING");
//getting the passed value from videogallery
Bundle bundle = new Bundle();
ArrayList<String> getValue = bundle.getStringArrayList("sendData");
Log.e("RECEIVED_DATA======",getValue.toString());
//adding the files to the list
for(String pathName : getValue){
File filePath = new File(pathName);
checkedList.add(filePath);
}
//setting the adapter
imageAdapter = new ImageAdapter(checkedList);
recyclerView.setAdapter(imageAdapter);
recyclerView.setVisibility(View.VISIBLE);
View items = mInflater.from(parent.getContext()).inflate(R.layout.custom_added_video,
parent,false);
items.setLayoutParams(new AbsListView.LayoutParams(215,215));
return new ViewHolder(items);
}
#Override
public int getItemViewType(int position) {
return super.getItemViewType(position);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
if(fileName != null){
bitmap = ThumbnailUtils.createVideoThumbnail(fileName.get(position).toString(),1);
holder.imageView.setImageBitmap(bitmap);
}
}
#Override
public int getItemCount() {
return fileName.size();
}
}
class ViewHolder extends RecyclerView.ViewHolder {
public ImageView imageView;
//public ImageButton imageButton;
public ViewHolder(View itemView) {
super(itemView);
//imageButton = (ImageButton) itemView.findViewById(R.id.addVideos);
imageView = (ImageView) itemView.findViewById(R.id.galleryImageView);
}
} }
2. fragment_add.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:orientation="vertical"
android:background="#color/colorWhite"
tools:context="in.pinelane.myhovi.AddFragment">
<!-- TODO: Update blank fragment layout -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:id="#+id/linearLayout"
android:padding="19dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="17dp"
android:textStyle="bold"
android:text="Choose Videos"
android:textColor="#color/colorBackground"/>
<View
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_weight="1" />
<ImageButton
android:id="#+id/gotoButton"
android:layout_width="25sp"
android:layout_height="25sp"
android:background="#00ffffff"
android:src="#mipmap/ic_arrow_forward_black_24dp"/>
</LinearLayout>
<Button
android:id="#+id/buttonToGallery"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Gallery"/>
<android.support.v7.widget.RecyclerView
android:id="#+id/grid_add_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" />
Inflates this layout
custom_added_video.xml
<?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"
android:background="#color/colorWhite"
android:layout_marginTop="3dp"
android:layout_marginBottom="3dp"
android:layout_marginEnd="3dp"
android:layout_marginStart="3dp">
<!--<ImageButton-->
<!--android:id="#+id/addVideos"-->
<!--android:layout_width="match_parent"-->
<!--android:layout_height="wrap_content"-->
<!--android:src="#mipmap/ic_add_black_24dp"-->
<!--android:layout_margin="3dp"-->
<!--android:background="#drawable/edittext_border"-->
<!--android:layout_centerInParent="true"/>-->
<ImageView
android:id="#+id/galleryImageView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="centerCrop"
android:layout_margin="3dp"
android:layout_centerInParent="true"/>
Any idea would be of great help! Thanks
I've tried defining the below code in onCreate but I got a NullPointerException so I defined the same inside the onCreateViewHolder but no result just No Adapter attached; skipping layout
Log.e("ADAPTER SETTING","DOING");
//getting the passed value from videogallery
Bundle bundle = new Bundle();
ArrayList<String> getValue = bundle.getStringArrayList("sendData");
Log.e("RECEIVED_DATA======",getValue.toString());
//adding the files to the list
for(String pathName : getValue){
File filePath = new File(pathName);
checkedList.add(filePath);
}
//setting the adapter
imageAdapter = new ImageAdapter(checkedList);
recyclerView.setAdapter(imageAdapter);
recyclerView.setVisibility(View.VISIBLE);
EDITS
I've made some changes inside my code and user onActivityResult and startActivityForResult in this fragment but still no result. My AddFragment is still blank and not showing any result
Edited AddFragment.java
public class AddFragment extends Fragment {
private ImageButton nextActivity;
private RecyclerView recyclerView;
ArrayList<File> checkedList = new ArrayList<>();
ImageAdapter imageAdapter;
Button button;
private static final int CustomGallerySelectId = 1;//Set Intent Id
public AddFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_add, container, false);
nextActivity = (ImageButton) view.findViewById(R.id.gotoButton);
recyclerView = (RecyclerView) view.findViewById(R.id.grid_add_view);
button = (Button) view.findViewById(R.id.buttonToGallery);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivityForResult(new Intent(getContext(),VideoGalleryActivity.class),CustomGallerySelectId);
}
});
//setting the adapter
imageAdapter = new ImageAdapter(checkedList);
GridLayoutManager videoGrid = new GridLayoutManager(getContext(),3);
recyclerView.setLayoutManager(videoGrid);
recyclerView.setAdapter(imageAdapter);
recyclerView.setVisibility(View.VISIBLE);
return view;
}
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch(requestCode){
case CustomGallerySelectId :
if(requestCode == RESULT_OK){
Log.e("ADAPTER SETTING","DOING");
//getting the passed value from videogallery
Bundle bundle = new Bundle();
ArrayList<String> getValue = bundle.getStringArrayList("sendData");
Log.e("RECEIVED_DATA======",getValue.toString());
//adding the files to the list
for(String pathName : getValue) {
File filePath = new File(pathName);
checkedList.add(filePath);
}
}
}
}
//making adapter for RecyclerView which loads the desired files
class ImageAdapter extends RecyclerView.Adapter<ViewHolder>{
private LayoutInflater mInflater;
private Bitmap bitmap;
private ArrayList<File> fileName;
public ImageAdapter(ArrayList<File> checkedList) {
fileName = checkedList;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View items = mInflater.from(parent.getContext()).inflate(R.layout.custom_added_video,
parent,false);
items.setLayoutParams(new AbsListView.LayoutParams(215,215));
return new ViewHolder(items);
}
#Override
public int getItemViewType(int position) {
return super.getItemViewType(position);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
if(fileName != null){
bitmap = ThumbnailUtils.createVideoThumbnail(fileName.get(position).toString(),1);
holder.imageView.setImageBitmap(bitmap);
}
}
#Override
public int getItemCount() {
return fileName.size();
}
}
class ViewHolder extends RecyclerView.ViewHolder {
public ImageView imageView;
//public ImageButton imageButton;
public ViewHolder(View itemView) {
super(itemView);
//imageButton = (ImageButton) itemView.findViewById(R.id.addVideos);
imageView = (ImageView) itemView.findViewById(R.id.galleryImageView);
}
} }

Move this code:
//setting the adapter
imageAdapter = new ImageAdapter(checkedList);
recyclerView.setAdapter(imageAdapter);
recyclerView.setVisibility(View.VISIBLE);
to your createView() method.
In createView you are inflating the layout, you are finding the RecyclerView but you are not setting an adapter to it. The RecyclerView doesn't have any data to show, so it's skipped from the layout for a performance boost. You should also set a LayoutManager. If you need a simple list, you should use LinearLayoutManager.
The createViewHolder() method is called once for each visible element of your RecyclerView. It's not the right place to perform the initial setup of your RecyclerView.

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<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="match_parent"
android:layout_height="match_parent"
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<RelativeLayout 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:id="#+id/recLayout"
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android:layout_width="fill_parent"
android:layout_height="fill_parent"
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activity_detailed.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/detailed_match_reports"
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<?xml version="1.0" encoding="utf-8"?>
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android:layout_alignParentEnd="true"
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What am I missing?
Thanks
Theo.

Change these
articleTextView = (TextView)getActivity().findViewById(R.id.articleTextView);
imageView = (ImageView)getActivity().findViewById(R.id.imageNews);
to
articleTextView = (TextView)v.findViewById(R.id.articleTextView);
imageView = (ImageView)v.findViewById(R.id.imageNews);
You'r passing data to DetailActivity. So first retrieve in DetailActivity and then pass to DetailFragment.
Also you need to pass data to DetailFragment using Bundle with setArguments(bundle)

Your Textview articleTextView is in the fragment but you are finding it in the activitys xml:
articleTextView = (TextView)getActivity().findViewById(R.id.articleTextView);
insetad you should do:
articleTextView = (TextView)(v.findViewById(R.id.articleTextView));
Do the same for Imageviewl.

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holder.title.setText(FoodArray.get(position).getTitle());
holder.name.setText(FoodArray.get(position).getName());
itemsDesc.add(FoodArray.get(position).getTitle());
itemsDesc.add(FoodArray.get(position).getName());
itemsDesc.add(FoodArray.get(position).getURL());
DownloadImage Downloader = new DownloadImage(holder.foodImage);
Downloader.execute(FoodArray.get(position).getURL());
setAnimation(holder.relativeLayout, position);
Fragment blankFragment = new BlankFragment();
Bundle bundle = new Bundle();
bundle.putStringArrayList("Food",itemsDesc);
blankFragment.setArguments(bundle);
((FragmentActivity)mContext).getSupportFragmentManager().beginTransaction()
.add(holder.frameLayout.getId(),blankFragment,"BlankFragment").addToBackStack(null).commit();
}
//this is to download async
public class DownloadImage extends AsyncTask<String,Void,Bitmap>{
private ImageView mImageView;
public DownloadImage(ImageView imageView){
this.mImageView = imageView;
}
//this is the code for downloading the image
#Override
protected Bitmap doInBackground(String ... url){
Bitmap Image = null;
try{
InputStream is = new URL(url[0]).openStream();
Image = BitmapFactory.decodeStream(is);
}catch(MalformedURLException ex){
ex.printStackTrace();
}
catch(IOException ex ){
ex.printStackTrace();
}
return Image;
}
#Override
protected void onPostExecute(Bitmap result) {
if (result != null) {
mImageView.setImageBitmap(result);
}
}
}
private void setAnimation(View viewToAnimate, int position)
{
// If the bound view wasn't previously displayed on screen, it's animated
if (position > lastPosition)
{
Animation animation = AnimationUtils.loadAnimation(viewToAnimate.getContext(), android.R.anim.slide_in_left);
viewToAnimate.startAnimation(animation);
lastPosition = position;
}
}
#Override
public int getItemCount(){return FoodArray.size();}
}
and heres the code for my fragment
public class BlankFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.fragment_blank,container,false);
TextView title = (TextView)view.findViewById(R.id.text_view_title);
TextView description = (TextView)view.findViewById(R.id.text_view_description);
ImageView foodImage = (ImageView) view.findViewById(R.id.image_view_big_food_image);
ArrayList<String> foods = getArguments().getStringArrayList("Food");
title.setText(foods.get(0));
description.setText(foods.get(1));
DownloadImage Downloader = new DownloadImage(foodImage);
Downloader.execute(foods.get(2));
return view;
}
public class DownloadImage extends AsyncTask<String,Void,Bitmap> {
private ImageView mImageView;
public DownloadImage(ImageView imageView){
this.mImageView = imageView;
}
//this is the code for downloading the image
#Override
protected Bitmap doInBackground(String ... url){
Bitmap Image = null;
try{
InputStream is = new URL(url[0]).openStream();
Image = BitmapFactory.decodeStream(is);
}catch(MalformedURLException ex){
ex.printStackTrace();
}
catch(IOException ex ){
ex.printStackTrace();
}
return Image;
}
#Override
protected void onPostExecute(Bitmap result) {
if (result != null) {
mImageView.setImageBitmap(result);
}
}
}
So with my current code i am expecting the data to be like this
But i got this instead
so i am unsure on how to make it so i can get my expected results
Please and thanks and advance

Guys i found my problem and there's no solution to this as the answer stated in this person question in stackoverflow here he stated that initializing a fragment in the onBindView is possible but you can't do it if you're gonna use only one specific id as the fragment will stack on it instead of adding one on each recycler item

How to create a cardView programatically?

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);
}
}
}
}

ReclyclerView and CardView, onclick method perform the action on several CardViews at same time

I've got a RecyclerView which populates from an ArrayList. The output is a CardView layout.
In the Cardview, there are 2 buttons amongst other Views.
They only have to read the current value of a TextView, which by default is 1, and increase or decrease it.
The Arraylist contains 8 items.
When I run the app the UI works fine. Trouble is when I try to modify the value of the TextView.
The value is correctly increased and decreased on the CardView I'm working on, but ALSO the value is modified on another CardView. And in that second CardView, modifying its TextView value, also modifies the first one.
So, what am I doing wrong?
This is my Fragment:
public class Fragment_rosas extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.layout_rosas,container,false);
RecyclerView recyclerview_rosas;
RecyclerView.Adapter adaptador_rv_rosas;
RecyclerView.LayoutManager lm_rosas;
List rosas = new ArrayList();
rosas.add(new Tropa(1,R.drawable.minibarbaro, getResources().getString(R.string.barbaro),7,1));
recyclerview_rosas = (RecyclerView) view.findViewById(R.id.recyclerView_tropasRosas);
recyclerview_rosas.setHasFixedSize(true);
lm_rosas = new LinearLayoutManager(getContext());
recyclerview_rosas.setLayoutManager(lm_rosas);
adaptador_rv_rosas = new AdaptadorTropa(rosas);
recyclerview_rosas.setAdapter(adaptador_rv_rosas);
return view;
}
}
And here the part of code on my Adapter:
#Override
public void onBindViewHolder(final TropaViewHolder viewHolder, int i) {
viewHolder.imagen.setImageResource(items.get(i).getImagen());
viewHolder.nombre.setText(items.get(i).getNombre());
viewHolder.maxnivel.setText(String.valueOf(items.get(i).getNivelMax()));
viewHolder.espacioencamp.setText((String.valueOf(items.get(i).getEspacioEnCamp())));
final String nombre = items.get(i).getNombre();
final int maxnivel = items.get(i).getNivelMax();
viewHolder.nivelmas.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String niveltemp = viewHolder.nivel.getText().toString();
String nivelmaxtemp = viewHolder.maxnivel.getText().toString();
int nivel = Integer.parseInt(niveltemp);
int maxxnivel = Integer.parseInt(nivelmaxtemp);
int nuevonivel = nivel+1 ;
if (nuevonivel<=maxxnivel) {
viewHolder.txtv_nivel.setText(String.valueOf(nuevonivel));
}
}
});
My OnCreateViewHolder (nothing really happens here):
#Override
public TropaViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.cardview, viewGroup, false);
return new TropaViewHolder(v);
}

Here is the solution, as mentioned in the comment above, it addresses two problems:
1. positiontoValueMap - saves current value for each position
2. onclicklistener is passed to the ViewHolder in onCreateViewHolder
Adapter Class
public class MyAdapter extends RecyclerView.Adapter {
private Context context;
private List<String> dataList;
private Map<Integer, Integer> positionToValueMap = new HashMap<>();
public MyAdapter(Context context, List<String> dataList) {
this.context = context;
this.dataList = dataList;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.recycler_view_item, null, false);
return new MyViewHolder(view, new OnRecyclerItemClickListener());
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
((MyViewHolder) holder).onRecyclerItemClickListener.updatePosition(position);
((MyViewHolder) holder).position.setText("" + position);
((MyViewHolder) holder).title.setText(dataList.get(position));
int valueToDisplay = 1;
if(positionToValueMap.containsKey(position)) {
valueToDisplay = positionToValueMap.get(position);
} else {
positionToValueMap.put(position, valueToDisplay);
}
((MyViewHolder) holder).valueView.setText("value: " + valueToDisplay);
}
#Override
public int getItemCount() {
return dataList.size();
}
private class MyViewHolder extends RecyclerView.ViewHolder {
private OnRecyclerItemClickListener onRecyclerItemClickListener;
private TextView position;
private TextView title;
private TextView valueView;
public MyViewHolder(View itemView, OnRecyclerItemClickListener onRecyclerItemClickListener) {
super(itemView);
itemView.setOnClickListener(onRecyclerItemClickListener);
this.onRecyclerItemClickListener = onRecyclerItemClickListener;
this.position = (TextView) itemView.findViewById(R.id.position);
this.title = (TextView) itemView.findViewById(R.id.title);
this.valueView = (TextView) itemView.findViewById(R.id.value_view);
}
}
private class OnRecyclerItemClickListener implements View.OnClickListener {
private int position = -1;
public void updatePosition(int position) {
this.position = position;
}
#Override
public void onClick(View v) {
int oldValue = positionToValueMap.get(position); // get current value
oldValue++; // increment
positionToValueMap.put(position, oldValue); // save current value
notifyItemChanged(position); // update clicked view so that it picks up the new saved value from the positionToValueMap in onBindViewHolder
}
}
}
RecyclerView item layout
<TextView
android:id="#+id/position"
android:layout_width="30dp"
android:layout_height="50dp"
android:textColor="#android:color/white"
android:gravity="center"
android:background="#android:color/holo_green_light"
android:layout_alignParentLeft="true"/>
<TextView
android:id="#+id/title"
android:layout_width="50dp"
android:layout_height="50dp"
android:textColor="#android:color/white"
android:gravity="center"
android:background="#android:color/holo_green_dark"
android:layout_toRightOf="#id/position" />
<TextView
android:id="#+id/value_view"
android:layout_width="match_parent"
android:layout_height="50dp"
android:textColor="#android:color/white"
android:gravity="center"
android:background="#android:color/holo_green_light"
android:layout_toRightOf="#id/title"
android:layout_alignParentRight="true"/>
</RelativeLayout>
And Activity to test it out
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
recyclerView.setAdapter(new MyAdapter(getApplicationContext(), getSampleData()));
}
private static List<String> getSampleData() {
List<String> dataList = new ArrayList<>();
dataList.add("zero");
dataList.add("one");
dataList.add("two");
dataList.add("three");
dataList.add("four");
dataList.add("five");
dataList.add("six");
dataList.add("seven");
dataList.add("eight");
dataList.add("nine");
dataList.add("ten");
dataList.add("eleven");
dataList.add("twelve");
dataList.add("thirteen");
dataList.add("fourteen");
dataList.add("fifteen");
dataList.add("sixteen");
dataList.add("seventeen");
dataList.add("eighteen");
dataList.add("nineteen");
dataList.add("twenty");
return dataList;
}
}
activity layout
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/root_view"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/white"/>
</RelativeLayout>

Develop Reference

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ReclyclerView and CardView, onclick method perform the action on several CardViews at same time

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