I want to implement a recycler view click event. I intended to have an event when I clicked tvRoomNum. But error 'TextView.setOnClickListener(android.view.View$OnClickListener)' on a null object reference' occurs. So I notice that tvRoomNum is null object and attempt to use 'findViewById'. But the function is not recognized. How can I solve the problem?
public class RoomAdapter extends RecyclerView.Adapter<RoomAdapter.CustomViewHolder> {
private Context context;
private ArrayList<RoomData> rooms;
public ArrayList<StudnetInRoomData> students;
private LayoutInflater inflater;
private RoomData room;
View view;
public RoomAdapter(Context context, ArrayList<RoomData> rooms) {
this.context = context;
this.rooms = rooms;
this.inflater = LayoutInflater.from(context);
students = new ArrayList<>();
}
#Override
public CustomViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
view = inflater.inflate(R.layout.single_room, parent, false);
return new CustomViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull CustomViewHolder holder, int position) {
room = rooms.get(position);
holder.tvRoomNum.setText(String.valueOf(room.roomNum));
}
#Override
public int getItemCount() {
return rooms.size();
}
public class CustomViewHolder extends RecyclerView.ViewHolder {
public TextView tvRoomNum;
public CustomViewHolder(View itemView) {
super(itemView);
tvRoomNum.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {
Intent intent = new Intent(view.getContext(), PlusStudentActivity.class);
intent.putExtra("studentList", room.students);
context.startActivity(intent);
}
});
}
}
}
The code below is the adapter of the recycler view that implements the recycler view. This is a dual recircular view structure.
public class FloorAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements OnFloorItemClickListener {
OnFloorItemClickListener listener;
static public ArrayList<FloorData> floors;
private Context context;
private LayoutInflater layoutInflater;
private OnItemClickListener mListener = null;
public FloorAdapter(ArrayList<FloorData> floors, Context context) {
this.floors = floors;
this.context = context;
this.layoutInflater = LayoutInflater.from(context);
}
public interface OnItemClickListener{
void onItemClick(View v, int pos);
}
public void setOnItemClickListener(OnItemClickListener listener) {
this.mListener = listener ;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = layoutInflater.inflate(R.layout.signle_floor, parent, false);
return new GridViewHolder(view);
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
((GridViewHolder)holder).recyclerView.setAdapter(new RoomAdapter(context, floors.get(position).rooms));
((GridViewHolder)holder).recyclerView.setLayoutManager(new GridLayoutManager(context, 5));
((GridViewHolder)holder).recyclerView.setHasFixedSize(true);
((GridViewHolder)holder).tvFloorNum.setText(String.valueOf(floors.get(position).floorNum));
}
#Override
public int getItemCount() {
return floors.size();
}
#Override public void onItemClick(RecyclerView.ViewHolder holder, View view, int position) {
if(listener != null){
listener.onItemClick(holder,view,position);
}
}
#Override
public int getItemViewType(int position) {
return floors.get(position).id;
}
public class GridViewHolder extends RecyclerView.ViewHolder {
RecyclerView recyclerView;
TextView tvFloorNum;
Button btnPlusRoom;
public GridViewHolder(View itemView) {
super(itemView);
recyclerView = itemView.findViewById(R.id.rvRooms);
tvFloorNum = itemView.findViewById(R.id.tvFloorNum);
btnPlusRoom = (Button)itemView.findViewById(R.id.btnPlusRoom);
btnPlusRoom.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v)
{
int pos = getAdapterPosition();
if (pos != RecyclerView.NO_POSITION)
{
if(mListener != null){
mListener.onItemClick(v, pos);
}
}
}
});
}
}
}
Your TextView is null, because you are missing the findViewById():
You find the Id on a View, in this case, it is the itemView
The function was not recognised because you would've just called findViewById() & ViewHolder does not have that method,
You should've called itemView.findViewById() instead.
Try this:
public class CustomViewHolder extends RecyclerView.ViewHolder {
public TextView tvRoomNum;
public CustomViewHolder(View itemView) {
super(itemView);
tvRoomNum = itemView.findViewById(R.id.your_textview_id) // THIS
tvRoomNum.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {
Intent intent = new Intent(view.getContext(), PlusStudentActivity.class);
intent.putExtra("studentList", room.students);
context.startActivity(intent);
}
});
}
}
Related
I have an adapter class Where i Want to show a BLOCK USER dialog on particular position.
for example if i want to block position 1 of recyclerView .
So can any one help me porgrammatically?
Given below is the Code Of adapter Please check
I want to block user profile based on Recycler View position
if someone could help me in it please;
public class TableProfileAdapter extends RecyclerView.Adapter<TableProfileAdapter.MyViewHolder> {
Context context;
Activity getActivity;
List<TableProfile> profileUser;
OnRecItemClick onRecItemClick;
private boolean isScaleAnimationDone = false;
private boolean isTimerTextViewActionUpCalled = false;
public TableProfileAdapter(List<TableProfile> profileUser, Context context) {
this.profileUser = profileUser;
this.context = context;
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.profile_item, parent, false);
return new MyViewHolder(view, onRecItemClick);
}
#Override
public void onBindViewHolder(#NonNull MyViewHolder holder, int position) {
TableProfile data = profileUser.get(position);
holder.tvUserName.setText(data.getProfileName());
Bitmap image = BitmapManager.byteToBitmap(data.getProfileImage());
holder.profilePic.setImageBitmap(image);
if (context instanceof AccessProfileManagementActivity) {
context.startActivity(new Intent(context,HomeActivity.class));
} else if (context instanceof ProfileManagement) {
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(context, ProfileDetailsActivity.class);
TableProfile model = profileUser.get(holder.getAdapterPosition());
intent.putExtra("DATA", model);
context.startActivity(intent);
notifyDataSetChanged();
((Activity) context).finish();
}
});
}
}
#Override
public int getItemCount() {
return profileUser.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
CircleImageView profilePic;
TextView tvUserName, birthday;
OnRecItemClick onRecItemClick;
RelativeLayout relativeLayout;
public MyViewHolder(#NonNull View itemView, OnRecItemClick onRecItemClick) {
super(itemView);
profilePic = itemView.findViewById(R.id.profileImage);
tvUserName = itemView.findViewById(R.id.userName);
relativeLayout = itemView.findViewById(R.id.relTop);
this.onRecItemClick = onRecItemClick;
itemView.setOnClickListener(this);
}
#Override
public void onClick(View view) {
onRecItemClick.onItemClick(getAdapterPosition());
}
}
public interface OnRecItemClick {
void onItemClick(int position);
}
}
I'm creating an app with firebase as a backend. I'm using same adapter for different activity, now it is working good but positions were mismatched for example: The output of position 0 shows in position 1 and for position 1 shows in position 2 and so on.. How to solve this problem, The problem with the positions of the output.
Adapter:
public class FrontlistAdapter extends FirebaseRecyclerAdapter<Gamedata, FrontlistAdapter.ViewHolder> {
private static final String TAG = "GameAdapter";
Context mContext;
int positions;
public FrontlistAdapter(#NonNull FirebaseRecyclerOptions<Gamedata> options, Context context) {
super(options);
mContext = context;
}
#Override
protected void onBindViewHolder(#NonNull ViewHolder holder, int position, #NonNull Gamedata model) {
holder.name.setText(model.getName());
holder.address.setText(model.getAddress());
//Picasso.get().load(model.getFrontcover()).into(holder.Frontcover);
Glide.with(mContext).load(model.getFrontcover()).into(holder.Frontcover);
positions = position; //<-- here I'm having positions but output shows different for each positions
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View v = layoutInflater.inflate(R.layout.gamerow,parent,false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
ImageView Frontcover;
TextView name;
TextView address;
View v;
public ViewHolder(#NonNull View itemView) {
super(itemView);
Frontcover = (ImageView)itemView.findViewById(R.id.frontcover);
name = (TextView)itemView.findViewById(R.id.frontname);
address=(TextView)itemView.findViewById(R.id.frontaddress);
v = itemView;
itemView.setClickable(true);
itemView.setOnClickListener((View.OnClickListener) this);
}
#Override
public void onClick(View v) {
String className = mContext.getClass().getSimpleName();
Intent intent = null;
switch (className) {
case "GameActivity":
intent = new Intent(mContext, Center_details.class);
intent.putExtra("User", getRef(positions).getKey());
break;
case "KidsActivity":
intent = new Intent(mContext,AllCenterDetails.class);
intent.putExtra("Kids",getRef(positions).getKey());
break;
}
mContext.startActivity(intent);
}
}
}
first what you have to do is create the interface like this
public interface ClickListner {
void onClick(View view, int position);
}
then in your activity create object of the interface like this and pass to the adapter along with your other data
ClickListner listener = ClickListner();
FrontlistAdapter customAdapter = new
FrontlistAdapter(AcceptedOrdersActivity.this,listener);
riderView.setAdapter(customAdapter);
copy this outside onCreate and intent in this
private ClickListner ClickListner() {
ClickListner listener = new ClickListner() {
#Override
public void onClick(View view, int position) {
int tag = (int) view.getTag();
if(tag == 0)
{
//Intent here
}
}
};
return listener;
}
now your adapter should be this one
public class FrontlistAdapter extends
RecyclerView.Adapter<FrontlistAdapter .DataObjectHolder>{
ClickListner listenr;
Context context;
public FrontlistAdapter (Context context,ClickListner listenr) {
this.context = context;
this.listenr = listenr;
}
public static class DataObjectHolder extends RecyclerView.ViewHolder {
Context context;
public DataObjectHolder(View itemView,ClickListner listenr) {
super(itemView);
this.listenr = listenr;
Frontcover = (ImageView)itemView.findViewById(R.id.frontcover);
name = (TextView)itemView.findViewById(R.id.frontname);
address=(TextView)itemView.findViewById(R.id.frontaddress);
v = itemView;
setOnClickListeners();
}
private void setOnClickListeners() {
`v.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
v.setTag(0);
listenr.onClick(v, getAdapterPosition());
}
});
}
}
#NonNull
#Override
public FrontlistAdapter.DataObjectHolder onCreateViewHolder(#NonNull ViewGroup parent,
int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.cell_orderdetail_list, parent, false);
FrontlistAdapter.DataObjectHolder dataObjectHolder = new
FrontlistAdapter.DataObjectHolder(view,listenr);
return dataObjectHolder;
}
#Override
public void onBindViewHolder(#NonNull FrontlistAdapter.DataObjectHolder holder, int
position) {
}
#Override
public int getItemCount() {
return options.size;
}
}
positions = position;
This is your problem. You're setting one global position for everything in the adapter.
Everywhere you are currently using position, you should instead be calling getBindingAdapterPosition() on the ViewHolder.
I want to make a onItemclicklistener method to recycleview of buttons and every button intent to Activity
but the Activity has Textview (every button has different Textview )
public class RecAdapter extends RecyclerView.Adapter<RecAdapter.ViewHolder> {
public class ViewHolder extends RecyclerView.ViewHolder {
Button button;
public ViewHolder(View itemView) {
super(itemView);
button = itemView.findViewById(R.id.buttonn);
}
}
private Context context;
private List<items> items;
public RecAdapter(Context c, List<items> itemList) {
this.context = c;
items = itemList;
}
#Override
public RecAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.buttonss, parent, false);
return new ViewHolder(v);
}
#Override
public void onBindViewHolder(RecAdapter.ViewHolder holder, int position) {
items p = items.get(position);
holder.button.setText(p.getName());
}
#Override
public int getItemCount() {
return items.size();
}
}`
Add OnClickListener on itemView of holder like below:
#Override
public void onBindViewHolder(RecAdapter.ViewHolder holder, int position) {
items p = items.get(position);
holder.button.setText(p.getName());
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Do here
}
});
}
I have a recyclerview in ShoppingCartActivity and a button in ProductDetailActivity. I want to send some data to ShoppingCartActivity when a button clicked in ProductDetailActivity and display them in recyclerview item that creates dynamically in ShoppingCartActivity.
I added addData method to recyclerview Adapter but it doesn't work and app crashes.
shop_btn = findViewById(R.id.add_to_shopping_cart);
shop_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent addToCart = new Intent(ProductDetailActivity.this, ShoppingCartActivity.class);
startActivity(addToCart);
}
});
//HERE IS MY RECYCLERVIEW ADAPTER
public class RecyclerViewAdapter_ShoppingCart extends RecyclerView.Adapter<RecyclerViewAdapter_ShoppingCart.MyViewHolder> {
private Context context;
List<CartItems> cartItemsList;
public RecyclerViewAdapter_ShoppingCart(Context context, List<CartItems> cartItemsList) {
this.context = context;
this.cartItemsList = cartItemsList;
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view;
LayoutInflater layoutInflater = LayoutInflater.from(context);
view = layoutInflater.inflate(R.layout.card_cart, parent, false);
return new MyViewHolder(view);
}
#NonNull
#Override
public void onBindViewHolder(#NonNull final MyViewHolder holder, final int position) {
holder.cart_title.setText(cartItemsList.get(position).getTitle());
holder.cart_price.setText(cartItemsList.get(position).getPrice());
Picasso.get().load(cartItemsList.get(position).getImageUrl()).into(holder.cart_img);
}
#Override
public int getItemCount() {
return cartItemsList.size();
}
public static class MyViewHolder extends RecyclerView.ViewHolder {
TextView cart_title, cart_price;
ImageView cart_img;
public MyViewHolder(View itemView) {
super(itemView);
cart_title = itemView.findViewById(R.id.cart_title);
cart_price = itemView.findViewById(R.id.cart_price);
//cart_delete = itemView.findViewById(R.id.cart_delete);
cart_img = itemView.findViewById(R.id.cart_image);
}
}
public void addItem(List<CartItems> cartItems) {
CartItems newValue = new CartItems();
newValue.setTitle("123");
newValue.setPrice("123");
newValue.setImageUrl("");
cartItems.add(newValue);
notifyDataSetChanged();
}
}
My goal is adding recyclerview items dynamically to ShoppingCartActivity when a button clicked in ProductDetailActivity but app crashes.
I am bumbing my head on trying to implement a ClickListener in an adapter for a DialogFragment.
I am getting the error on the codeline:
holder.bind(tzmodel.get(position), listener);
Error says (bind() in ViewHolder cannot be applied). Seems it does not match the ViewHolder code.
Could somebody please assist?
The code for my timeZoneAdapter:
public class timeZoneAdapter extends RecyclerView.Adapter<timeZoneAdapter.ViewHolder> {
public interface OnItemClickListener {
void onItemClick(TimezoneModel item);
}
private Context c;
private List<TimezoneModel> tzmodel;
private final OnItemClickListener listener;
public timeZoneAdapter(Context c, List<TimezoneModel> tzModel, OnItemClickListener listener) {
this.c = c;
this.tzmodel = tzModel;
this.listener = listener;
}
//INITIALIE TZ
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.timezonemodel, parent, false);
return new ViewHolder(v);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
holder.bind(tzmodel.get(position), listener); <-- error
}
#Override
public int getItemCount() {
return tzmodel.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
TextView timeTxt, currenttimeTxt, regionTxt;
public ViewHolder(View itemView) {
super(itemView);
timeTxt= (TextView) itemView.findViewById(R.id.timeTxt);
currenttimeTxt= (TextView) itemView.findViewById(R.id.currentTimeTxt);
regionTxt= (TextView) itemView.findViewById(R.id.regionTxt);
}
public void bind(ViewHolder viewHolder, int i, final OnItemClickListener listener) {
viewHolder.timeTxt.setText(tzmodel.get(i).getTime());
viewHolder.currenttimeTxt.setText(tzmodel.get(i).getCurrentTime());
viewHolder.regionTxt.setText(tzmodel.get(i).getRegion());
itemView.setOnClickListener(new View.OnClickListener() {
#Override public void onClick(View v) {
listener.onItemClick((TimezoneModel) tzmodel);
}
});
}
}
}
The problem is the parameters that you put in the bind method that you define.
You define the public method bind in the ViewHolder class in this way:
public void bind(ViewHolder viewHolder, int i, final OnItemClickListener listener){
//...
}
You can fix your compile error change the call to :
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
holder.bind(holder,position, listener);
}
I also share with you a couple of correction because if you create a public method in the ViewHolder class, you don't need to recipe the viewHolder instance because you can access with this operator:
public class TimeZoneAdapter extends RecyclerView.Adapter<TimeZoneAdapter.ViewHolder> {
public interface OnItemClickListener {
void onItemClick(TimezoneModel item);
}
private Context c;
private List<TimezoneModel> tzmodel;
private final OnItemClickListener listener;
public TimeZoneAdapter(Context c, List<TimezoneModel> tzModel, OnItemClickListener listener) {
this.c = c;
this.tzmodel = tzModel;
this.listener = listener;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false);
return new ViewHolder(v);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
holder.bind(tzmodel.get(position), listener);
}
#Override
public int getItemCount() {
return tzmodel.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
TextView timeTxt, currenttimeTxt, regionTxt;
public ViewHolder(View itemView) {
super(itemView);
timeTxt= itemView.findViewById(R.id.timeTxt);
currenttimeTxt= itemView.findViewById(R.id.currentTimeTxt);
regionTxt= itemView.findViewById(R.id.regionTxt);
}
public void bind(TimezoneModel item , final OnItemClickListener listener) {
this.timeTxt.setText(item.getTime());
this.currenttimeTxt.setText(item.getCurrentTime());
this.regionTxt.setText(item.getRegion());
itemView.setOnClickListener(new View.OnClickListener() {
#Override public void onClick(View v) {
listener.onItemClick((TimezoneModel) tzmodel);
}
});
}
}
}