Android - Unable to increment or decrement value from list item

Question

Hi everyone i am using custom listview for getting data from server and show in listview.. I am able to get data and show it in listview but i dont know to implement the cli

Answer 1

Finally i solved my answer my self. Just need to implement interface and call in fragment class..

Updated Adapter class

public class FeedListAdapter extends RecyclerView.Adapter {
private Activity activity;
private LayoutInflater inflater;
private List feedItems;
private List filteredfeedItems;
ImageView plus;
ImageView minus;
String result;
String formattedDate;
int id;
 private View.OnClickListener onAddNum;
 private View.OnClickListener onSubNum;

public FeedListAdapter(Activity activity, List feedItems)
{       this.activity = activity;
    this.feedItems = feedItems;
    this.filteredfeedItems = feedItems;

    inflater = ( LayoutInflater )activity.
            getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

// create interface method

  public void setOnAddNum(View.OnClickListener onAddNum){ 
        this.onAddNum = onAddNum;
    }
    public void setOnSubNum(View.OnClickListener onSubNum){
        this.onSubNum = onSubNum;
    }

  @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.feed_item, parent, false);
        ViewHolder viewHolder = new ViewHolder(v);
        return viewHolder;
    }
  @Override
    public void onBindViewHolder(final ViewHolder holder, int position) {

      FeedItem item =(FeedItem)filteredfeedItems.get(position);
         holder.date.setText(item.getObservation());
         holder.initiator
            .setText(item.getObservation());
            holder.location.setText(String.valueOf(item.getNum())+"");
         holder.assignTo.setText(item.getSummary());

 // set tag to know which button you clicked'

         holder.plus.setTag(position);
         holder.plus.setFocusable(true);
         holder.plus.setClickable(true);

 //  set callback interface  ，  

         holder.plus.setOnClickListener(onAddNum);
         holder.minus.setTag(position);
         holder.minus.setOnClickListener(onSubNum);

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

  public long getItemId(int position) {
    return position;

  }

    class ViewHolder extends RecyclerView.ViewHolder{

         ImageView plus;
         ImageView minus;
         TextView date;
         TextView initiator;
         TextView assignTo;
         TextView location;
        public ViewHolder(View vi) {
            super(vi);

           date = (TextView) vi.findViewById(R.id.name);
           initiator = (TextView) vi
                    .findViewById(R.id.timestamp4);
           assignTo = (TextView) vi.findViewById(R.id.timestamp);

           location = (TextView) vi.findViewById(R.id.timestamp2);
           plus = (ImageView) vi.findViewById(R.id.btnAddToCart1);

           minus = (ImageView) vi.findViewById(R.id.btnAddToCart5);

        }
    }
} 

now in activity class implement View.OnClickListener for button events.

public class MyFragment extends Fragment implements View.OnClickListener

 @Override
public void onClick(View view) {
    Object tag = view.getTag();
    switch (view.getId()){
        case R.id.item_btn_add: //  click add buttons number  ，  performs corresponding processing  

 if (tag != null && tag instanceof Integer) {

                 int position = (Integer) tag;
            Your pojo class  

      int num =feedItems.get(position).getNum();
         num++;
      feedItems.get(position).setNum(num);
       adapter.notifyDataSetChanged();
  }
     break;

   case R.id.btnAddToCart5:
       if (tag != null && tag instanceof Integer) {

           int position = (Integer) tag;
           int num =feedItems.get(position).getNum();

       if (num>0) {
           num--;
           feedItems.get(position).setNum(num);
           listAdapter.notifyDataSetChanged();
       }

       else{
            num= 0;
            listAdapter.notifyDataSetChanged();
        }

       }
       break;
     }

Enjoy coding