I have one recycler View as a parent and a recycler view inside it. I want to update all of my parent recycler view's rows, when I am selecting a row from child recycler view.
In parent recycler view It have two textviews and one recycler view. The increase class and adapter class for parent recycler view is shown below.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rv = (RecyclerView)findViewById(R.id.reviews);
LinearLayoutManager mLinearLayoutManager = new LinearLayoutManager(this);
rv.setLayoutManager(mLinearLayoutManager);
Data();
adapter = new Adapterclass(countryList,MainActivity.this);
rv.setAdapter(adapter);
rv.addOnItemTouchListener(new RecyclerTouchListener(getApplicationContext(),rv,new ClickListener(){
#Override
public void onClick(View view, int position) {
Log.e("position child",""+position);
adapter = new Adapterclass(position);
}
#Override
public void onLongClick(View view, int position) {
}
}));
}
Adapter class :
public class Adapterclass extends RecyclerView.Adapter<Adapterclass.MyViewHolder> {
private List<ModelMain> flist;
private List<Modelclass>carList;
Context c;
boolean set = false;
int positn;
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView text,currency;
RecyclerView recycler;
public MyViewHolder(View view) {
super(view);
text = (TextView)view.findViewById(R.id.gggg);
currency= (TextView)view.findViewById(R.id.hhh);
recycler = (RecyclerView)view.findViewById(R.id.rview2);
}
}
public Adapterclass(List<ModelMain> slist, Context c){
this.flist = slist;
this.c = c;
}
#Override
public Adapterclass.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.cell,parent,false);
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(Adapterclass.MyViewHolder holder, final int position) {
ModelMain fm = flist.get(position);
holder.text.setText(fm.getName());
holder.currency.setText(fm.getCurrency());
carList = new ArrayList<>();
carList = fm.getArrays();
Log.d("list",""+carList.toString());
LinearLayoutManager mLinearLayoutManager = new LinearLayoutManager(c);
holder.recycler.setLayoutManager(mLinearLayoutManager);
final Adapter_Inside adapter = new Adapter_Inside(carList,c);
holder.recycler.setAdapter(adapter);
holder.recycler.addOnItemTouchListener(new RecyclerTouchListener(c,holder.recycler,new ClickListener(){
#Override
public void onClick(View view, int pos) {
ModelMain mm = flist.get(positn);
carList = new ArrayList<>();
carList = mm.getArrays();
Modelclass mv = carList.get(pos);
Log.e("valll", "" + carList.get(pos).getVal());
Boolean bool = carList.get(pos).getVal();
if(bool){
}else{
for(int i =0; i<carList.size();i++){
Modelclass cls = new Modelclass();
Boolean v = carList.get(i).getVal();
String text = carList.get(i).getText();
if(v){
cls.setVal(false);
cls.setText(text);
carList.set(i,cls);
}
}
mv.setVal(true);
set = true;
}
adapter.notifyDataSetChanged();
}
#Override
public void onLongClick(View view, int position) {
}
}));
}
public Adapterclass(int pos){
this.positn = pos;
}
private void SetAdapr() {
notifyDataSetChanged();
}
public interface ClickListener {
void onClick(View view, int position);
void onLongClick(View view, int position);
}
public static class RecyclerTouchListener implements RecyclerView.OnItemTouchListener {
private GestureDetector gestureDetector;
private ClickListener clickListener;
public RecyclerTouchListener(Context applicationContext, final RecyclerView rv, final ClickListener clickListener) {
this.clickListener = clickListener;
gestureDetector = new GestureDetector(applicationContext, new GestureDetector.SimpleOnGestureListener() {
#Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
#Override
public void onLongPress(MotionEvent e) {
View child = rv.findChildViewUnder(e.getX(), e.getY());
if (child != null && clickListener != null) {
clickListener.onLongClick(child, rv.getChildPosition(child));
}
}
});
}
#Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View child = rv.findChildViewUnder(e.getX(), e.getY());
if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
clickListener.onClick(child, rv.getChildPosition(child));
}
return false;
}
#Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
#Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
}
#Override
public int getItemCount() {
return flist.size();
}
Model class for parent recycler view :
public class ModelMain {
String name;
String currency;
List<Modelclass> arrays ;
public ModelMain(String name, String currency, List<Modelclass> arrays) {
this.name = name;
this.currency = currency;
this.arrays = arrays;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getCurrency() {
return currency;
}
public void setCurrency(String currency) {
this.currency = currency;
}
public List<Modelclass> getArrays() {
return arrays;
}
public void setArrays(List<Modelclass> arrays) {
this.arrays = arrays;
}
}
And my child recycler view adapter class is :
public class Adapter_Inside extends RecyclerView.Adapter<Adapter_Inside.MyViewHolder> {
private List<Modelclass>carList;
Context c;
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView text;
ImageView iv;
public MyViewHolder(View view) {
super(view);
text = (TextView)view.findViewById(R.id.textView);
iv = (ImageView)view.findViewById(R.id.iview);
}
}
public Adapter_Inside(List<Modelclass> slist, Context c){
this.carList = slist;
this.c = c;
}
#Override
public Adapter_Inside.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.secondcell,parent,false);
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(Adapter_Inside.MyViewHolder holder, int position) {
Modelclass fm = carList.get(position);
holder.text.setText(fm.getText());
if(fm.getVal()){
holder.iv.setImageResource(R.drawable.ic_clear_black_18dp);
}
else{
holder.iv.setImageResource(R.drawable.ic_done_black_16dp_2x);
}
}
#Override
public int getItemCount() {
return carList.size();
}
}
And model class for child is :
public class Modelclass {
Boolean val;
String text;
public Boolean getVal() {
return val;
}
public void setVal(Boolean val) {
this.val = val;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
}
I couldn't retrieve parent recycler view's position when clicking any row in the child view.please help.
You can get reference to your parent RecyclerView by passing it in the Adapter contructor.
public Adapterclass(RecyclerView parent, List<ModelMain> slist, Context c){
this.flist = slist;
this.c = c;
this.recyclerView = parent;
}
Then you can use recycler parent reference and his methods to retrieve all you need
Related
I'm learning RecyclerView and I built an app that can populate simple data from SQLite database
I have an Adapter as follows :-
public class BookAdapter extends RecyclerView.Adapter<BookAdapter.BookViewHolder> {
Context mContext;
Cursor mCursor;
OnBookListener mOnBookListener;
public int id;
public BookAdapter(Context context, Cursor cursor, OnBookListener onBookListener){
mContext = context;
mCursor = cursor;
mOnBookListener = onBookListener;
}
public class BookViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView id_textView, name_textView;
OnBookListener onBookListener;
public BookViewHolder(#NonNull View itemView, OnBookListener onBookListener) {
super(itemView);
id_textView = itemView.findViewById(R.id.book_id);
name_textView = itemView.findViewById(R.id.book_name);
this.onBookListener = onBookListener;
itemView.setOnClickListener(this);
}
public String getId_textView() {
return (String)id_textView.getText();
}
public String getName_textView() {
return (String)name_textView.getText();
}
#Override
public void onClick(View v) {
onBookListener.onBookClick((String)id_textView.getText());
//Log.d(TAG, "onBookClick : Clicked " + id_textView.getText());
}
}
public interface OnBookListener{
void onBookClick(String id);
}
#NonNull
#Override
public BookViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(mContext);
View view = inflater.inflate(R.layout.book_item,parent,false);
return new BookViewHolder(view, mOnBookListener);
}
#Override
public void onBindViewHolder(#NonNull BookViewHolder holder, int position) {
if(!mCursor.moveToPosition(position)){
return;
}
id = mCursor.getInt(mCursor.getColumnIndex(Book.BookEntry.COLUMN_ID));
String name = mCursor.getString(mCursor.getColumnIndex(Book.BookEntry.COLUMN_NAME));
holder.id_textView.setText(String.valueOf(id));
holder.name_textView.setText(name);
if(position %2 == 1)
{
holder.itemView.setBackgroundColor(Color.parseColor("#E9EEF3"));
}
else
{
holder.itemView.setBackgroundColor(Color.parseColor("#0FA9E8"));
}
}
#Override
public int getItemCount() {
return mCursor.getCount();
}
public void swapCursor(Cursor newCursor){
if(mCursor != null){
mCursor.close();
}
mCursor = newCursor;
if(newCursor != null){
notifyDataSetChanged();
}
}
now with the Activity itself :
public class MainActivity extends AppCompatActivity implements BookAdapter.OnBookListener {
public SQLiteDatabase mdatabase;
public BookAdapter madapter;
private static final String TAG = "MainActivity";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//SqliteDBHelper dbHelper = new SqliteDBHelper(this);
SqliteAssetHelper dbHelper = new SqliteAssetHelper(this);
mdatabase = dbHelper.getReadableDatabase();
RecyclerView recyclerView = findViewById(R.id.recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
madapter = new BookAdapter(this, getAllBooks(), this);
recyclerView.setAdapter(madapter);
madapter.swapCursor(getAllBooks());
}
private Cursor getAllBooks(){
return mdatabase.query(Book.BookEntry.TABLE_NAME,null,null,null
,null,null,null);
}
#Override
public void onBookClick(String id) {
Intent intent = new Intent(this, HadithsList.class);
intent.putExtra("id", ???);
startActivity(intent);
}
What code can I replace the question marks in the above intent to actually get the id from the interface : OnBookListener That is implemented in the activity.
Thanks in advance
Assuming you want to pass an id to the next Activity, and assuming the followinf line retrieve the id you want
onBookListener.onBookClick((String)id_textView.getText());
Then, the id is your parameter, so you just have to do this
intent.putExtra("id", id);
Create this class
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import androidx.recyclerview.widget.RecyclerView;
public class RecyclerTouchListener implements RecyclerView.OnItemTouchListener
{
private GestureDetector gestureDetector;
private ClickListener clickListener;
public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final ClickListener clickListener) {
this.clickListener = clickListener;
gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
#Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
#Override
public void onLongPress(MotionEvent e) {
View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
if (child != null && clickListener != null) {
clickListener.onLongClick(child, recyclerView.getChildPosition(child));
}
}
});
}
#Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View child = rv.findChildViewUnder(e.getX(), e.getY());
if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
clickListener.onClick(child, rv.getChildPosition(child));
}
return false;
}
#Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
#Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
public interface ClickListener {
void onClick(View view, int position);
void onLongClick(View view, int position);
}
}
handle onClick
recyclerView.addOnItemTouchListener(new
RecyclerTouchListener(getApplicationContext(), recyclerView, new
RecyclerTouchListener.ClickListener() {
#Override
public void onClick(View view, int position) {
MealListModel model = myList.get(position);
}
#Override
public void onLongClick(View view, int position) {
}
}));
I am new to Android and I have a question.
I have a recyclerview that can be clicked and will send a query. When clicked, it will get a number/ID of each position that is clicked,
like this:
fno = arrivals.get(position).flightno;
codeCity = arrivals.get(position).arr;
When clicked for the first time it succeeds, but when clicked for the second or third time, it gets an error. I think this because the variable fno and codeCity has been filled. So how to delete the value on the variable?
This my code when the recyclerview clicked:
mRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
GestureDetector gestureDetector = new GestureDetector(mContext, new GestureDetector.SimpleOnGestureListener() {
public boolean onSingleTapUp(MotionEvent e){
return true;
}
});
#Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View child = rv.findChildViewUnder(e.getX(), e.getY());
if (child != null && gestureDetector.onTouchEvent(e)){
int position = rv.getChildAdapterPosition(child);
fno = arrivals.get(position).flightno;
codeCity = arrivals.get(position).arr;
final Bundle i = new Bundle();
i.putString("city", codeCity.toString()); // Key1
i.putString("flightno", fno.toString()); // Key1
open2(i);
}
return false;
}
#Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
#Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
});
This the query
public void open2(Bundle args) {
codeIata = args.getString("city");
String flightdate = args.getString("flightdate");
fno = args.getString("flightno");
ArrivalActivity.detail(codeIata, flightdate, fno);
}
public static void detail(String s, String date, String fno) {
DateFormat df = new SimpleDateFormat("yyyy-MM-d");
date = df.format(Calendar.getInstance().getTime());
Call<GetArrivals> arrCall = mApiInterface.getArr(s, "2019-03-04", "", fno);
arrCall.enqueue(new Callback<GetArrivals>() {
#Override
public void onResponse(Call<GetArrivals> call, Response<GetArrivals>
response) {
System.out.println("status code "+response.code());
arrivals = response.body().getResult();
mAdapter = new ArrivalAdapter(mContext, arrivals);
//mRecyclerView.setAdapter(mAdapter);
}
#Override
public void onFailure(Call<GetArrivals> call, Throwable t) {
Log.e("Retrofit Get", t.toString());
}
});
}
Thank you!
There are two approaches you can capture a click event on item of a recyclerview:
First approach
override onClick method instead of onInterceptTouchEvent.
I am providing you with an example.
mRecyclerView.addOnItemTouchListener(new RecyclerTouchListener(this,
recyclerView, new ClickListener() {
#Override
public void onClick(View view, final int position) {
fno = arrivals.get(position).flightno;
codeCity = arrivals.get(position).arr;
}
}));
class RecyclerTouchListener implements RecyclerView.OnItemTouchListener{
private ClickListener clicklistener;
private GestureDetector gestureDetector;
public RecyclerTouchListener(Context context, final RecyclerView recycleView, final ClickListener clicklistener){
this.clicklistener=clicklistener;
gestureDetector=new GestureDetector(context,new GestureDetector.SimpleOnGestureListener(){
#Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
#Override
public void onLongPress(MotionEvent e) {
View child=recycleView.findChildViewUnder(e.getX(),e.getY());
if(child!=null && clicklistener!=null){
clicklistener.onLongClick(child,recycleView.getChildAdapterPosition(child));
}
}
});
}
#Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View child=rv.findChildViewUnder(e.getX(),e.getY());
if(child!=null && clicklistener!=null && gestureDetector.onTouchEvent(e)){
clicklistener.onClick(child,rv.getChildAdapterPosition(child));
}
return false;
}
#Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
#Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
}
Second Approach(a more conventional one)
override the OnClickListener of the viewholder of your adapter:
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
LayoutInflater inflater;
Context context;
private MyAdapter.RecyclerViewClickListener mListener;
public MyAdapter(Context context, RecyclerViewClickListener mListener) {
this.context = context;
this.mListener = mListener;
inflater = LayoutInflater.from(this.context);
}
public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public MyViewHolder(View item, RecyclerViewClickListener listener) {
super(item);
mListener = listener;
item.setOnClickListener(this);
}
#Override
public void onClick(View view) {
mListener.onClick(view, getAdapterPosition());
}
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.mylayout, parent, false);
return new MyViewHolder(itemView,mListener);
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
}
#Override
public int getItemCount() {
return youylist.size();
}
#Override
public int getItemViewType(int position) {
return position;
}
#Override
public long getItemId(int position) {
return 0;
}
public interface RecyclerViewClickListener {
void onClick(View view, int position);
}
}
and in your Fragment/Activity:
myadapter = new MyAdapter(getContext(), new MyAdapter.RecyclerViewClickListener() {
#Override
public void onClick(View view, int position) {
fno = arrivals.get(position).flightno;
codeCity = arrivals.get(position).arr;
}
});
recyclerView.setAdapter(MyAdapter);
MyAdapter.notifyDataSetChanged();
Hope this helps you.
I have this adapter class where I have an object with a list in it.
public class ProductAdapter extends RecyclerView.Adapter<ProductAdapter.ProductViewHolder> {
private Context context;
private Shop shop;
public ProductAdapter(Context context, Shop shop) {
this.context = context;
this.shop = shop;
}
#Override
public ProductViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View v = inflater.inflate(R.layout.product_row, parent, false);
return new ProductViewHolder(v);
}
#Override
public void onBindViewHolder(ProductViewHolder holder, int position) {
holder.tvProductTitle.setText(shop.products.get(position).getTitle());
holder.tvProductDescription.setText(shop.products.get(position).getDescription());
Glide.with(context)
.load(shop.products.get(position).getImageUrl())
.placeholder(android.R.drawable.ic_menu_upload_you_tube)
.error(android.R.drawable.stat_notify_error)
.diskCacheStrategy(DiskCacheStrategy.RESULT)
.into(holder.ivProduct);
}
#Override
public int getItemCount() {
if (shop.products != null) {
return shop.products.size();
}
return 0;
}
public static class ProductViewHolder extends RecyclerView.ViewHolder {
private TextView tvProductTitle, tvProductDescription;
private ImageView ivProduct;
public ProductViewHolder(View itemView) {
super(itemView);
tvProductTitle = (TextView) itemView.findViewById(R.id.tvProductTitle);
tvProductDescription = (TextView) itemView.findViewById(R.id.tvProductDescription);
ivProduct = (ImageView) itemView.findViewById(R.id.ivProduct);
}
}
public interface ClickListener {
void onClick(View v, int position);
void onLongClick(View v, int position);
}
public static class RecyclerTouchListener implements RecyclerView.OnItemTouchListener {
private GestureDetector gestureDetector;
private ProductAdapter.ClickListener clickListener;
public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final ProductAdapter.ClickListener clickListener) {
this.clickListener = clickListener;
gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
#Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
#Override
public void onLongPress(MotionEvent e) {
View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
if (child != null && clickListener != null) {
clickListener.onLongClick(child, recyclerView.getChildAdapterPosition(child));
}
}
});
}
#Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View child = rv.findChildViewUnder(e.getX(), e.getY());
if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
clickListener.onClick(child, rv.getChildAdapterPosition(child));
}
return false;
}
#Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
#Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
}
I use this adapter in my fragment where I can click an item from the recyclerview which will open another activity with the selected product and it's parametars. Instead of clicking the whole item, I would like to click on part of it (lets say imageview) which will do the same as it is doing now. But, I would also like to put a checkbox in the recyclerview item itself which will have different function. At the moment, I can't use an intent in the adapter class. The way it is set up now I can only click the whole item. How can I make it work like I explained above?
public class ProductsFragment extends android.support.v4.app.Fragment {
private RecyclerView rvProduct;
private RecyclerView.LayoutManager layoutManager;
private ProductAdapter productAdapter;
public static ProductsFragment newInstance(Bundle args) {
ProductsFragment fragment = new ProductsFragment();
fragment.setArguments(args);
return fragment;
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_products, container, false);
rvProduct = (RecyclerView) v.findViewById(R.id.rvProduct);
rvProduct.setHasFixedSize(true);
layoutManager = new GridLayoutManager(getContext(), 2);
rvProduct.setLayoutManager(layoutManager);
Bundle bundle = getArguments();
final Shop shop = (Shop) bundle.getSerializable("shop");
productAdapter = new ProductAdapter(getContext(), shop);
rvProduct.setAdapter(productAdapter);
productAdapter.notifyDataSetChanged();
rvProduct.addOnItemTouchListener(new ProductAdapter.RecyclerTouchListener(getContext(), rvProduct, new ProductAdapter.ClickListener() {
#Override
public void onClick(View v, int position) {
Intent details = new Intent(getContext(), ProductDetailsActivity.class);
details.putExtra("product", shop.products.get(position));
startActivity(details);
}
#Override
public void onLongClick(View v, int position) {
}
}));
return v;
}
}
EDIT:
I've managed to do this, please tell me if this is right and efficient way:
holder.tvProductTitle.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(context, ProductDetailsActivity.class);
i.putExtra("product", shop.products.get(position));
context.startActivity(i);
}
});
The way you doing it is not correct.
As your onBindViewHolder will be called repeatedly as you scroll through the list, every time a new listener will be set.
Instead you should set the listeners in the ViewHolder class of Adapter. And use getAdapterPosition() method to get the position of item clicked.
For example:
public class ProductAdapter extends RecyclerView.Adapter<ProductAdapter.ProductViewHolder> {
private Context context; private Shop shop;
public ProductAdapter(Context context, Shop shop) {
this.context = context;
this.shop = shop;
}
#Override public ProductViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View v = inflater.inflate(R.layout.product_row, parent, false);
return new ProductViewHolder(v);
}
#Override public void onBindViewHolder(ProductViewHolder holder, int position) {
holder.tvProductTitle.setText(shop.products.get(position).getTitle());
holder.tvProductDescription.setText(shop.products.get(position).getDescription());
Glide.with(context) .load(shop.products.get(position).getImageUrl()) .placeholder(android.R.drawable.ic_menu_upload_you_tube) .error(android.R.drawable.stat_notify_error) .diskCacheStrategy(DiskCacheStrategy.RESULT) .into(holder.ivProduct);
}
#Override public int getItemCount()
{
if (shop.products != null) {
return shop.products.size();
} return 0;
}
public static class ProductViewHolder extends RecyclerView.ViewHolder {
private TextView tvProductTitle, tvProductDescription;
private ImageView ivProduct;
public ProductViewHolder(View itemView)
{
super(itemView);
tvProductTitle = (TextView) itemView.findViewById(R.id.tvProductTitle);
tvProductDescription = (TextView) itemView.findViewById(R.id.tvProductDescription);
ivProduct = (ImageView) itemView.findViewById(R.id.ivProduct);
// Set onclickListener on image
ivProduct.setOnCliCkListener(new onClickListener(){
#Override
public void onClick(View v){
Intent i = new Intent(context, ProductDetailsActivity.class);
i.putExtra("product",
shop.products.get(getAdapterPosition()));
context.startActivity(i);
}
}
}
}
public interface ClickListener {
void onClick(View v, int position);
void onLongClick(View v, int position);
}
}
You can add click listeners to each respective view of the inflated item in public onBindViewHolder. Did you consider that?
Edit: Ok it's what you did. I don't know about the efficiency though, but this is the way I would do it.
How can handle with this situation -> I have a list of itens in a recyclerView and I want to choose one of those option: green, yellow or red face to get the value of object from list item I chose
So I thought something like bellow, but when I select one of those faces anything happens. I think that button click listener doesn't work. Please someone can drive me to a better suggestion that works, give me an example or could me tell what am I doing wrong?
My adapter
public class LikeListAdapter extends RecyclerView.Adapter<LikeListAdapter.LikeItemViewHolder> {
private List<Goals> goalsList;
private SparseBooleanArray selectedItems;
public LikeListAdapter(List<Goals> goalsList) {
this.goalsList = goalsList;
}
#Override
public LikeItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Context context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(R.layout.recycler_item_like, parent, false);
return new LikeItemViewHolder(view);
}
#Override
public void onBindViewHolder(LikeItemViewHolder holder, int position) {
final Goals goals = goalsList.get(position);
if (goals != null && getItemCount() > 0) {
holder.goalsDescriptionTextView.setText(goals.getDescription());
holder.happyButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.e("fretgr", "get Green Point = " + goals.getGreenPoint());
setToggleSelection(1);
}
});
holder.sosoButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.e("rtret", "get Yellow Point = " + goals.getYellowPoint());
setToggleSelection(2);
}
});
holder.angryButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.e("ewwr", "get Red Point = " + goals.getRedPoint());
setToggleSelection(3);
}
});
}
}
#Override
public int getItemCount() {
return goalsList.size();
}
public class LikeItemViewHolder extends RecyclerView.ViewHolder {
#Bind(R.id.description_goalsTextView)
TextView goalsDescriptionTextView;
#Bind(R.id.happy)
ImageView happyButton;
#Bind(R.id.soso)
ImageView sosoButton;
#Bind(R.id.angry)
ImageView angryButton;
public LikeItemViewHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
// method to access in activity after updating selection
public List<Goals> getGoalsList() {
return goalsList;
}
public void setToggleSelection(int pointType){
selectedItems = new SparseBooleanArray();
if (selectedItems.get(pointType, false)) {
selectedItems.delete(pointType);
} else {
selectedItems.put(pointType, true);
}
notifyItemChanged(pointType);
}
public int getToggleSelection(){
return 0;
}
}
My Fragment
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
layoutManager.scrollToPosition(0);
assocGoalsRecyclerView.setLayoutManager(layoutManager);
assocGoalsRecyclerView.setHasFixedSize(true);
likeListAdapter = new LikeListAdapter(associateList);
assocGoalsRecyclerView.setAdapter(likeListAdapter);
assocGoalsRecyclerView.addOnItemTouchListener(RecycleTouchListener);
private RecyclerView.OnItemTouchListener RecycleTouchListener = new RecyclerView.OnItemTouchListener() {
#Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View child = assocGoalsRecyclerView.findChildViewUnder(e.getX(), e.getY());
if(child!=null && mGestureDetector.onTouchEvent(e)){
final int position = assocGoalsRecyclerView.getChildAdapterPosition(child);
final Goals goals = associateList.get(position);
final Categories c = categoriesList.get(position);
final int type = likeListAdapter.getToggleSelection();
return true;
}
return false;
}
#Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) { }
#Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) { }
};
I found an answer based in another responses and sugestions!!! Android: handling clicks on image view inside recycler's view item using touch framework
In My Fragment
Snippet from fragment:
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
layoutManager.scrollToPosition(0);
assocGoalsRecyclerView.setLayoutManager(layoutManager);
// assocGoalsRecyclerView.addItemDecoration(new SimpleDividerItemDecoration(getActivity()));
assocGoalsRecyclerView.setHasFixedSize(true);
likeListAdapter = new LikeListAdapter(associateList, onItemClickCallback);
assocGoalsRecyclerView.setAdapter(likeListAdapter);
public static class OnItemClickListener implements View.OnClickListener {
private int position;
private OnItemClickCallback onItemClickCallback;
public OnItemClickListener(int position, OnItemClickCallback onItemClickCallback) {
this.position = position;
this.onItemClickCallback = onItemClickCallback;
}
#Override
public void onClick(View view) {
onItemClickCallback.onItemClicked(view, position);
}
public interface OnItemClickCallback {
void onItemClicked(View view, int position);
}
}
private OnItemClickListener.OnItemClickCallback onItemClickCallback = new OnItemClickListener.OnItemClickCallback() {
#Override
public void onItemClicked(View view, int position) {
switch(view.getId()){
case R.id.happy:
Log.e("rtetre", "happy assessed and position is = " + position);
break;
case R.id.soso:
Log.e("rwere", "soso assessed and position is = " + position);
break;
case R.id.angry:
Log.e("dfrefgt", "angry assessed and position is = " + position);
break;
}
}
};
In My adapter
public class LikeListAdapter extends RecyclerView.Adapter<LikeListAdapter.LikeItemViewHolder> {
private List<Goals> goalsList;
private LikeFragment.OnItemClickListener.OnItemClickCallback onItemClickCallback;
public LikeListAdapter(List<Goals> goalsList, LikeFragment.OnItemClickListener.OnItemClickCallback onItemClickCallback) {
this.goalsList = goalsList;
this.onItemClickCallback = onItemClickCallback;
}
#Override
public LikeItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Context context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(R.layout.recycler_item_like, parent, false);
LikeItemViewHolder likeItemViewHolder = new LikeItemViewHolder(view);
return likeItemViewHolder;
}
#Override
public void onBindViewHolder(LikeItemViewHolder holder, int position) {
final Goals goals = goalsList.get(position);
if (goals != null && getItemCount() > 0) {
holder.goalsDescriptionTextView.setText(goals.getDescription());
holder.happyButton.setOnClickListener(new LikeFragment.OnItemClickListener(position, onItemClickCallback));
holder.sosoButton.setOnClickListener(new LikeFragment.OnItemClickListener(position, onItemClickCallback));
holder.angryButton.setOnClickListener(new LikeFragment.OnItemClickListener(position, onItemClickCallback));
}
}
#Override
public int getItemCount() {
return goalsList.size();
}
public static class LikeItemViewHolder extends RecyclerView.ViewHolder {
#Bind(R.id.description_goalsTextView)
TextView goalsDescriptionTextView;
#Bind(R.id.happy)
ImageView happyButton;
#Bind(R.id.soso)
ImageView sosoButton;
#Bind(R.id.angry)
ImageView angryButton;
public LikeItemViewHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
}
I am able to change the color of the text and background of imageview of the row clicked of my recyclerview in my navigation drawer fragment.
But my problem is after clicking the 4th item,the 1st item also gets selected.Likewise after clicking my 5th item the 2nd item is selected.
Like this:
How do i solve this? So that only one item is selected at a time?
FragmentDrawer.java
public class FragmentDrawer extends Fragment {
private static String TAG = FragmentDrawer.class.getSimpleName();
private RecyclerView recyclerView;
private ActionBarDrawerToggle mDrawerToggle;
private DrawerLayout mDrawerLayout;
private NavigationDrawerAdapter adapter;
private View containerView;
private static String[] titles = null;
private FragmentDrawerListener drawerListener;
public FragmentDrawer() {
}
public void setDrawerListener(FragmentDrawerListener listener) {
this.drawerListener = listener;
}
public static List<NavDrawerItem> getData() {
List<NavDrawerItem> data = new ArrayList<>();
int[] icons = {R.drawable.ic_home,
R.drawable.ic_upcoming,
R.drawable.ic_saved,
R.drawable.ic_wehappened,
R.drawable.ic_persons,
R.drawable.ic_music,
R.drawable.ic_parties,
R.drawable.ic_art, R.drawable.ic_network, R.drawable.ic_sports};
// preparing navigation drawer items
for (int i = 0; i < titles.length && i < icons.length; i++) {
NavDrawerItem navItem = new NavDrawerItem();
navItem.setTitle(titles[i]);
navItem.setIcon(icons[i]);
data.add(navItem);
}
return data;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// drawer labels
titles = getActivity().getResources().getStringArray(R.array.nav_drawer_labels);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflating view layout
View layout = inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
recyclerView = (RecyclerView) layout.findViewById(R.id.drawerList);
adapter = new NavigationDrawerAdapter(getActivity(), getData());
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
List<SimpleSectionedRecyclerViewAdapter.Section> sections =
new ArrayList<SimpleSectionedRecyclerViewAdapter.Section>();
//Sections
sections.add(new SimpleSectionedRecyclerViewAdapter.Section(5, "Categories"));
recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getActivity(), recyclerView, new ClickListener() {
#Override
public void onClick(View view, int position) {
NavigationDrawerAdapter.selected_item = position;
recyclerView.getAdapter().notifyDataSetChanged();
drawerListener.onDrawerItemSelected(view, position);
mDrawerLayout.closeDrawer(containerView);
}
#Override
public void onLongClick(View view, int position) {
}
}));
SimpleSectionedRecyclerViewAdapter.Section[] dummy = new SimpleSectionedRecyclerViewAdapter.Section[sections.size()];
SimpleSectionedRecyclerViewAdapter mSectionedAdapter = new
SimpleSectionedRecyclerViewAdapter(getContext(), R.layout.section, R.id.section_text, adapter);
mSectionedAdapter.setSections(sections.toArray(dummy));
//Apply this adapter to the RecyclerView
recyclerView.setAdapter(mSectionedAdapter);
return layout;
}
public void setUp(int fragmentId, DrawerLayout drawerLayout, final Toolbar toolbar) {
containerView = getActivity().findViewById(fragmentId);
mDrawerLayout = drawerLayout;
mDrawerToggle = new ActionBarDrawerToggle(getActivity(), drawerLayout, toolbar, R.string.drawer_open, R.string.drawer_close) {
#Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
getActivity().invalidateOptionsMenu();
}
#Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
getActivity().invalidateOptionsMenu();
}
#Override
public void onDrawerSlide(View drawerView, float slideOffset) {
super.onDrawerSlide(drawerView, slideOffset);
toolbar.setAlpha(1 - slideOffset / 2);
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerLayout.post(new Runnable() {
#Override
public void run() {
mDrawerToggle.syncState();
}
});
}
public static interface ClickListener {
public void onClick(View view, int position);
public void onLongClick(View view, int position);
}
static class RecyclerTouchListener implements RecyclerView.OnItemTouchListener {
private GestureDetector gestureDetector;
private ClickListener clickListener;
public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final ClickListener clickListener) {
this.clickListener = clickListener;
gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
#Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
#Override
public void onLongPress(MotionEvent e) {
View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
if (child != null && clickListener != null) {
clickListener.onLongClick(child, recyclerView.getChildPosition(child));
}
}
});
}
#Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View child = rv.findChildViewUnder(e.getX(), e.getY());
if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
clickListener.onClick(child, rv.getChildPosition(child));
}
return false;
}
#Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
#Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
}
public interface FragmentDrawerListener {
public void onDrawerItemSelected(View view, int position);
}
}
NavigationDrawerAdapter.java
public class NavigationDrawerAdapter extends RecyclerView.Adapter<NavigationDrawerAdapter.MyViewHolder> {
List<NavDrawerItem> data = Collections.emptyList();
private LayoutInflater inflater;
private Context context;
public static int selected_item = 0;
public NavigationDrawerAdapter(Context context, List<NavDrawerItem> data) {
this.context = context;
inflater = LayoutInflater.from(context);
this.data = data;
}
public void delete(int position) {
data.remove(position);
notifyItemRemoved(position);
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.nav_drawer_row, parent, false);
MyViewHolder holder = new MyViewHolder(view);
return holder;
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
if(position == selected_item)
{
holder.title.setTextColor(Color.parseColor("#00aaff"));
holder.imgViewIcon.setBackgroundResource(R.drawable.ic_circle);
}
NavDrawerItem current = data.get(position);
holder.title.setText(current.getTitle());
holder.imgViewIcon.setImageResource(current.getIcon());
}
#Override
public int getItemCount() {
return data.size();
}
class MyViewHolder extends RecyclerView.ViewHolder {
TextView title;
public ImageView imgViewIcon;
public MyViewHolder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.title);
imgViewIcon = (ImageView) itemView.findViewById(R.id.item_icon);
}
}
}
EDIT: SimpleSectionedRecyclerViewAdapter.java
public class SimpleSectionedRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private final Context mContext;
private static final int SECTION_TYPE = 0;
private boolean mValid = true;
private int mSectionResourceId;
private int mTextResourceId;
private LayoutInflater mLayoutInflater;
private RecyclerView.Adapter mBaseAdapter;
private SparseArray<Section> mSections = new SparseArray<Section>();
public SimpleSectionedRecyclerViewAdapter(Context context, int sectionResourceId, int textResourceId,
RecyclerView.Adapter baseAdapter) {
mLayoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mSectionResourceId = sectionResourceId;
mTextResourceId = textResourceId;
mBaseAdapter = baseAdapter;
mContext = context;
mBaseAdapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
#Override
public void onChanged() {
mValid = mBaseAdapter.getItemCount()>0;
notifyDataSetChanged();
}
#Override
public void onItemRangeChanged(int positionStart, int itemCount) {
mValid = mBaseAdapter.getItemCount()>0;
notifyItemRangeChanged(positionStart, itemCount);
}
#Override
public void onItemRangeInserted(int positionStart, int itemCount) {
mValid = mBaseAdapter.getItemCount()>0;
notifyItemRangeInserted(positionStart, itemCount);
}
#Override
public void onItemRangeRemoved(int positionStart, int itemCount) {
mValid = mBaseAdapter.getItemCount()>0;
notifyItemRangeRemoved(positionStart, itemCount);
}
});
}
public static class SectionViewHolder extends RecyclerView.ViewHolder {
public TextView title;
public SectionViewHolder(View view,int mTextResourceid) {
super(view);
title = (TextView) view.findViewById(mTextResourceid);
}
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int typeView) {
if (typeView == SECTION_TYPE) {
final View view = LayoutInflater.from(mContext).inflate(mSectionResourceId, parent, false);
return new SectionViewHolder(view,mTextResourceId);
}else{
return mBaseAdapter.onCreateViewHolder(parent, typeView -1);
}
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder sectionViewHolder, int position) {
if (isSectionHeaderPosition(position)) {
((SectionViewHolder)sectionViewHolder).title.setText(mSections.get(position).title);
}else{
mBaseAdapter.onBindViewHolder(sectionViewHolder,sectionedPositionToPosition(position));
}
}
#Override
public int getItemViewType(int position) {
return isSectionHeaderPosition(position)
? SECTION_TYPE
: mBaseAdapter.getItemViewType(sectionedPositionToPosition(position)) +1 ;
}
public static class Section {
int firstPosition;
int sectionedPosition;
CharSequence title;
public Section(int firstPosition, CharSequence title) {
this.firstPosition = firstPosition;
this.title = title;
}
public CharSequence getTitle() {
return title;
}
}
public void setSections(Section[] sections) {
mSections.clear();
Arrays.sort(sections, new Comparator<Section>() {
#Override
public int compare(Section o, Section o1) {
return (o.firstPosition == o1.firstPosition)
? 0
: ((o.firstPosition < o1.firstPosition) ? -1 : 1);
}
});
int offset = 0; // offset positions for the headers we're adding
for (Section section : sections) {
section.sectionedPosition = section.firstPosition + offset;
mSections.append(section.sectionedPosition, section);
++offset;
}
notifyDataSetChanged();
}
public int positionToSectionedPosition(int position) {
int offset = 0;
for (int i = 0; i < mSections.size(); i++) {
if (mSections.valueAt(i).firstPosition > position) {
break;
}
++offset;
}
return position + offset;
}
public int sectionedPositionToPosition(int sectionedPosition) {
if (isSectionHeaderPosition(sectionedPosition)) {
return RecyclerView.NO_POSITION;
}
int offset = 0;
for (int i = 0; i < mSections.size(); i++) {
if (mSections.valueAt(i).sectionedPosition > sectionedPosition) {
break;
}
--offset;
}
return sectionedPosition + offset;
}
public boolean isSectionHeaderPosition(int position) {
return mSections.get(position) != null;
}
#Override
public long getItemId(int position) {
return isSectionHeaderPosition(position)
? Integer.MAX_VALUE - mSections.indexOfKey(position)
: mBaseAdapter.getItemId(sectionedPositionToPosition(position));
}
#Override
public int getItemCount() {
return (mValid ? mBaseAdapter.getItemCount() + mSections.size() : 0);
}
}
Change the onBindViewHolder method of your NavigationDrawerAdapter.java into this:
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
if(position == selected_item) {
holder.title.setTextColor(Color.parseColor("#00aaff"));
holder.imgViewIcon.setBackgroundResource(R.drawable.ic_circle);
} else {
holder.title.setTextColor(Color.parseColor("#00000")); //actually you should set to the normal text color
holder.imgViewIcon.setBackgroundResource(0);
}
NavDrawerItem current = data.get(position);
holder.title.setText(current.getTitle());
holder.imgViewIcon.setImageResource(current.getIcon());
}
Simple and Best
Inside Adapter class
int row_index=0;
inside onBindViewHOlder
holder.titleLL.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
row_index=position;
notifyDataSetChanged();
}
});
if (row_index==position) {
holder.title.setTextColor(Color.RED);
} else {
holder.title.setTextColor(Color.BLACK);
}
You can use class for Recycler view TouchListener
class RecyclerTouchListener implements RecyclerView.OnItemTouchListener{
private ClickListener clicklistener;
private GestureDetector gestureDetector;
public RecyclerTouchListener(Context context, final RecyclerView recycleView, final ClickListener clicklistener){
this.clicklistener=clicklistener;
gestureDetector=new GestureDetector(context,new GestureDetector.SimpleOnGestureListener(){
#Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
#Override
public void onLongPress(MotionEvent e) {
View child=recycleView.findChildViewUnder(e.getX(),e.getY());
if(child!=null && clicklistener!=null){
clicklistener.onLongClick(child,recycleView.getChildAdapterPosition(child));
}
}
});
}
#Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View child=rv.findChildViewUnder(e.getX(),e.getY());
RecyclerView.ViewHolder viewHolder=rv.findContainingViewHolder(child);
if(child!=null && clicklistener!=null && gestureDetector.onTouchEvent(e)){
clicklistener.onClick(child,rv.getChildAdapterPosition(child),viewHolder);
}
return false;
}
#Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
#Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
}
}
Implement an Interface
public interface ClickListener{
public void onClick(View view, int position,RecyclerView.ViewHolder viewHolder);
public void onLongClick(View view, int position);
}
And in your Main Activity (Here I set Image resource You can set as You like ,Any thing)
Create an arraylist named "selected" as Integer and add following code as OnClickListener
recyclerViewSchedule.addOnItemTouchListener(new RecyclerTouchListener(this,
recyclerViewSchedule, new ClickListener() {
#Override
public void onClick(View view, final int position, RecyclerView.ViewHolder v) {
//Values are passing to activity & to fragment as well
if(!selected.contains(position))
{
selected.add(position);
((ScheduleAdapter.MyHolder) v).txtImage.setBackgroundColor(getResources().getColor(R.color.colorAccent));
}else {
((ScheduleAdapter.MyHolder) v).txtImage.setBackgroundColor(getResources().getColor(R.color.colorTransparent));
selected.remove(new Integer(position));
}
Toast.makeText(ScheduleActivity.this, "Single Click on position :"+position,
Toast.LENGTH_SHORT).show();
}
Toast.makeText(ScheduleActivity.this, "Single Click on position :"+position,
Toast.LENGTH_SHORT).show();
}
#Override
public void onLongClick(View view, int position) {
Toast.makeText(ScheduleActivity.this, "Long press on position :"+position,
Toast.LENGTH_LONG).show();
}
}));
The txtImage I specified here is from RecyclerAdapter,Replace it with Your View
Happy Coding :-)
most of the answers for such a question, are about to Override Onclick in onBindViewHolder or implementing an interface for clicking in recycler view. but as we all know, onBindViewHolder is called as your views are populated during scrolling. Thus, you will have numerous calls to setOnClickListener so it is not an efficient way and also implementing interface is not as easy as the answer I got.
here is how you can access selecting items in recycler view and change its background or do what ever you want when an item is selected .
in your ViewHolder constructor use setOnTouchListener for itemView (the argument of constructor) in this way
itemView.setOnTouchListener((v, event) -> {
if (event.getAction() == MotionEvent.ACTION_UP) {
if (v.getTag() == null) {
v.setTag(true);
v.setBackgroundColor(Color.parseColor("#F31807"));
}
else {
v.setBackgroundColor(Color.TRANSPARENT);
v.setTag(null);
}
}
if (event.getAction() == MotionEvent.ACTION_MOVE) {
//default color
v.setBackgroundColor(Color.TRANSPARENT);
}
return true;
});
We use ACTION_UP for check if user pressed the item and after that we save a boolean in view's flag so that we can press every items how many times we want and see the color is changing. ACTION_MOVE if block is for prevent selecting items when scrolling the recycler view. if you see that selecting one item is affecting another items selection, you can use this answer:
issue : RecyclerView messed up data when scrolling
in the end if you are curious about why we return true in method see this video to understand.
tutorial on OnTouchListener And Motionevent
I have tried many different approaches but in the end, the solution that worked for me is
like first I was doing this
binding.download.setOnClickListener {
binding.download.visibility = View.GONE
binding.saved.visibility = View.VISIBLE
}
this was not working for me but after the below change
Instead of changing the color or visibility in onBindViewHolder, make a function in ViewHolder class and call it from onBindViewHolder
class ViewHolder(var binding: ImageRowBinding) : RecyclerView.ViewHolder(binding.root) {
fun bind(uri: Uri, mContext: Context) {
binding.download.setOnClickListener {
binding.download.visibility = View.GONE
binding.saved.visibility = View.VISIBLE
}
}
}
and calling this bind method from onBindViewHolder like this
holder.bind(items[position].uri, mContext)
works best for me