how to set value for each item button increase and decrease click and set that value in text view

Question

public class MyCustomAdapter extends BaseAdapter {
    Context context;
    String[] result;
    int[] imageId;
    String[] Cost;
    static int counter = 0;
    private static LayoutInflater inflater = null;


    public MyCustomAdapter(Context mainActivity, String[] result, int[] imageId, String[] Cost
    ) {
        // TODO Auto-generated constructor stub
        this.result = result;
        this.imageId = imageId;
        this.Cost = Cost;
        this.context = mainActivity;
        inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return result.length;
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    public class Holder {
        TextView tv;
        TextView cost;
        ImageView img;
        ImageView plusitem;
        ImageView minusitem;
        TextView itemnumber;

    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        final Holder holder = new Holder();
        View rowView;
        rowView = inflater.inflate(R.layout.listitem, null);
        holder.tv = (TextView) rowView.findViewById(R.id.textView1);
        holder.img = (ImageView) rowView.findViewById(R.id.imageView1);
        holder.cost = (TextView) rowView.findViewById(R.id.textView2);
        holder.plusitem = (ImageView) rowView.findViewById(R.id.imageButton2);
        holder.minusitem = (ImageView) rowView.findViewById(R.id.imageButton);
        holder.itemnumber = (TextView) rowView.findViewById(R.id.textView4);
        holder.tv.setText(result[position]);
        holder.img.setImageResource(imageId[position]);

        holder.plusitem.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {


                holder.itemnumber.setText(String.valueOf( _counter));
                //holder.itemnumber.setText(result[position]);

            }
        });

        holder.minusitem.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                holder.itemnumber.setText(String.valueOf( _counter));
                //  holder.itemnumber.setText(result[position]);
            }
        });


        return rowView;

    }}

This is my adapter we have +button for increase item and - button for decrease item i have to get item number like in first item if we have 2 item and second item we can 3 ,4 .. so on.. actuality i want to add item on cart actually i have tried with static variable its not working Properly please tell me logic . look my screen below

Jas · Answer 1 · 2015-10-07T09:25:20.273

2

Create the Buttons and the TextView as shown in your design.Write onclick methods for the Buttons.Initialize an Integer variable for saving the count.In the click of + button,increment the count by one and set the text in Textview.Similarly,when you click the - button,decrement the count by one and set the text in your TextView.

  int count=0;
    TextView txtCount =(TextView) findViewById(R.id.txt);
    Button buttonInc= (Button) findViewById(R.id.button1);
    Button buttonDec= (Button) findViewById(R.id.button2);

    buttonInc.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            count++;
            txtCount.setText(String.valueOf(count));

        }
    });

buttonDec.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            count--;
            txtCount.setText(String.valueOf(count));

        }
    });

edited Oct 07 '15 at 09:25

answered Oct 07 '15 at 09:19

Jas

3,207
2
15
45

That i have apply But here Problem as i tell u Suppose in item i have set item with 5 now suppose i increase item 2 then it start from six while it should Start from 1 – Research Development Oct 07 '15 at 09:26
Use `ViewHolder` in your Adapter class and set the value as your `TextView ` using setTag() method. – Jas Oct 07 '15 at 09:28
http://paste.ofcode.org/XDjKU6345XaHBbTbTVb43M look my code i have done same thing – Research Development Oct 07 '15 at 09:30
use setTag() because you can save the value to the textView itself. Refer this http://stackoverflow.com/questions/5291726/what-is-the-main-purpose-of-settag-gettag-methods-of-view – Jas Oct 07 '15 at 09:33
view.setTag(result[position],_counter); like this we ll have to Increase? – Research Development Oct 07 '15 at 09:39
will please tell me some more – Research Development Oct 07 '15 at 09:55
Set tag like **txtCount.setTag(count);** on button clicks. Retrieve tag value as **txtCount.getTag()** and save value to a string and set the text of textview to the value you got. – Jas Oct 07 '15 at 10:08
holder.itemnumber.setTag(_counter); holder.itemnumber.getTag(); I am using this code but still its not working i am unable to print please suggest me how to set and get value for each item – Research Development Oct 07 '15 at 10:37
I told you to retrieve the value using getTag() and save it in a string and set it to TextView.Did you do that? – Jas Oct 07 '15 at 10:45
yes u look on item click holder.minusitem.setOnClickListener – Research Development Oct 07 '15 at 10:47
I see this `holder.itemnumber.setTag(_counter); holder.itemnumber.getTag(); // holder.itemnumber.setText(result[position]);` which is not what i said.Where is the code for setting the count here? – Jas Oct 07 '15 at 10:48
count++ and count-- look that – Research Development Oct 07 '15 at 10:52
Use this .`String count = String.valueOf(holder.itemnumber.getTag());` and `holder.itemnumber.setText(count);` – Jas Oct 07 '15 at 10:57
but ho will increase and decrease value if we ll Put ur code i want incrrease on +button icon and decrease - button icon for each item i want do this seprtly – Research Development Oct 07 '15 at 11:15

score 2 · Answer 2 · edited Jun 12 '18 at 11:54

 holder.cart_minus_img.setOnClickListener(new View.OnClickListener() {

//1. List item

        @Override
        public void onClick(View v) {
            int count= Integer.parseInt(String.valueOf(holder.cart_product_quantity_tv.getText()));

            if(count>0){

 //2. enter code here

                count--;

                holder.cart_product_quantity_tv.setText(String.valueOf(count));
            }
        }
    });

    holder.cart_plus_img.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int count= Integer.parseInt(String.valueOf(holder.cart_product_quantity_tv.getText()));
            count++;
            holder.cart_product_quantity_tv.setText(String.valueOf(count));
        }
    });

score 0 · Answer 3 · answered Oct 07 '15 at 09:23

0

Use a hash map.For every item clicked store the item id as the key and the clicked count as the value.

For eg:<Item_id:item_count>

This way you can easily manage the user's selection and also its more efficient than using static variables as you need to have only a single hashmap .

answered Oct 07 '15 at 09:23

Abx

2,852
4
30
50

what value we ll put item id – Research Development Oct 07 '15 at 09:30
You each item is unique I believe,so put that id as the item id. – Abx Oct 07 '15 at 09:42
same issue am facing when i try to get value from another item it increase or decrese according to previsou item value – Research Development Oct 07 '15 at 09:49
why are u using position to set the item number?.2 items can have the same position when u scroll.U should have a unique identifier for individual items – Abx Oct 07 '15 at 10:05
what i have to set please look my code and tell me how to set coz i have used ur logic – Research Development Oct 07 '15 at 10:36
What data u have for your item that is clicked ..like name ,id etc? instead of this hm.put(result[position].toString(), String.valueOf(_counter)); put hm.put(, String.valueOf(_counter)); – Abx Oct 07 '15 at 12:33
we have Product name and Qunatity – Research Development Oct 08 '15 at 03:26
if that product name is unique then use that as the key – Abx Oct 08 '15 at 04:30

score 0 · Answer 4 · answered Oct 08 '15 at 04:15

First of all you should maintain one arraylist of custom class having fields like ItemId, ItemName, Price, Quantity, Image and so on. So that you can easily maintain quantity and other details in shopping cart.

Now in adapter you just need to pass this arrayList, no need of passing different Arrays.

int quantity = arraylist.get(position).getItemQuantity();

btnIncrease.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            quantity++;
            tvQuantity.setText(quantity+"");

        }
    });

btnDecrease.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            quantity--;
            tvQuantity.setText(quantity+"");

        }
    });

This works perfectly...

score 0 · Answer 5 · edited Feb 08 '18 at 13:37

This is the Adapter add to cart in this you can see on btnIncrease and btnDecrease in that i change the value of cart and i use notifyDataSetChanged(); it will change the data automatically

public class MoviesAdapter extends RecyclerView.Adapter<MoviesAdapter.MyViewHolder> {
    private List<Movie> moviesList;

    public class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView title, cart, genre;
        public Button btnIncrease,btnDecrease;

        public MyViewHolder(View view) {
            super(view);
            title = (TextView) view.findViewById(R.id.title);
            genre = (TextView) view.findViewById(R.id.genre);
            cart = (TextView) view.findViewById(R.id.cart);
            btnIncrease =view.findViewById(R.id.plus);
            btnDecrease = view.findViewById(R.id.minus);

        }
    }


    public MoviesAdapter(List<Movie> moviesList) {
        this.moviesList = moviesList;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.movie_list_row, parent, false);

        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(final MyViewHolder holder, final int position) {
        final Movie movie = moviesList.get(position);
        holder.title.setText(movie.getTitle());
        holder.genre.setText(movie.getGenre());
        holder.cart.setText(String.valueOf(movie.getcart()));
        holder.btnIncrease.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                movie.cart++;
                notifyDataSetChanged();
            }
        });

        holder.btnDecrease.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                if (movie.cart>0)
                     movie.cart--;

                notifyDataSetChanged();
            }
        });

    }

    @Override
    public int getItemCount() {
        return moviesList.size();
    }
}

how to set value for each item button increase and decrease click and set that value in text view

5 Answers5