Question

朋友们，我无法理解如何在列表视图的同一行中设置文本，其中我在中心有两个带文本视图的按钮但是当我尝试增加或减少效果时，显示在下一行，但不是我想要应用更改的行

CartAdapter.java

public class Cart_Adapter extends BaseAdapter {
    Context cartcontext;
    List<MobiData> cartlist;
    LayoutInflater inflater;
    cartlist cartdata;
    public ArrayList<Integer> quantity = new ArrayList<Integer>();
    CustomButtonListener customButtonListener;
    public Cart_Adapter(Context cartcontext, List<MobiData> cartlist) {
        this.cartcontext = cartcontext;
        this.cartlist = cartlist;
}
 @Override
    public int getCount() {
        return cartlist.size();
    }

    @Override
    public Object getItem(int position) {
        return cartlist.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }
@Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        inflater = (LayoutInflater) cartcontext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        if (convertView == null) {
            cartdata = new cartlist();
            convertView = inflater.inflate(R.layout.cart_row, parent, false);
            cartdata.decrement = (TextView) convertView.findViewById(R.id.decrement);
            cartdata.single = (TextView) convertView.findViewById(R.id.single);
            cartdata.single.setTag(position);
            cartdata.increment = (TextView) convertView.findViewById(R.id.increment);
            cartdata.increment.setTag(position);
            cartdata.cancel = (TextView) convertView.findViewById(R.id.cancel);
            cartdata.vcmedname = (TextView) convertView.findViewById(R.id.vcmedname);
            cartdata.vcmedprice = (TextView) convertView.findViewById(R.id.vcmedprice);
            Typeface carttext = Typeface.createFromAsset(cartcontext.getAssets(), "fonts/fontawesome.ttf");
            cartdata.decrement.setTypeface(carttext);
            cartdata.increment.setTypeface(carttext);
            cartdata.cancel.setTypeface(carttext);
            convertView.setTag(cartdata);
        } else {
            cartdata = (cartlist) convertView.getTag();
        }
        MobiData newcart = cartlist.get(position);
        cartdata.vcmedname.setText(newcart.getVcmedname());
        cartdata.vcmedprice.setText(newcart.getVcmedprice());
        cartdata.single.setText(newcart.getVcqty());
        final String cartids = newcart.getVcmedid();
        cartdata.cancel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                cartlist.remove(position);
                notifyDataSetChanged();
            }
        });
        cartdata.increment.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick( View v) {
                if (customButtonListener !=null){
                    int plus = Integer.parseInt(cartdata.single.getText().toString());
                plus++;
                                    int plus = Integer.parseInt(cartdata.single.getText().toString());
                plus++;
                cartdata.single.setText(String.valueOf(plus));
                SharedPreferences viewpref = cartcontext.getSharedPreferences("datapref", Context.MODE_PRIVATE);
                String cartuid = viewpref.getString("uid", "");
                String carttempid = viewpref.getString("tempid", "");
                String incremnturl = "http://sampletemplates.net/mobichemist/json/cart_process.php?mid=" + cartids + "&userid=" + cartuid + "&tempid=" + carttempid;
                Log.d("Incremnturl", incremnturl);
                JsonArrayRequest incrementarray = new JsonArrayRequest(Request.Method.GET, incremnturl, (String) null, new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        for (int i = 0; i < response.length(); i++) {
                            try {
                                JSONObject incrobj = response.getJSONObject(i);
                                int plus = Integer.parseInt(cartdata.single.getText().toString());
                                plus++;

                               cartdata.single.setText(String.valueOf(plus));

                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
                        }

                    }
                }, new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        Log.d("Incrementurl", String.valueOf(error));
                    }
                });
                incrementarray.setRetryPolicy(new DefaultRetryPolicy(50000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
                        DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
                           AppController.getInstance().addToRequestQueue(incrementarray);


            }
        });
        cartdata.decrement.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
 int i = Integer.parseInt(cartdata.single.getText().toString());
            i--;
            if (i <= 0) {
                Toast.makeText(Single_Cart_Page.this, "Minimum Quantity is 1", Toast.LENGTH_SHORT).show();
            } else {
                cartdata.single.setText(String.valueOf(i));
            }
            }
        });
        return convertView;
    }

    static class cartlist {
        TextView decrement, single, increment, cancel, vcmedname, vcmedprice;
    }

Answer 1

使用ArrayAdaper而不是ViewHolder的Base Adapter。不要为所有视图手动设置setTag（position）。在此处查找ViewHolder示例https://dzone.com/articles/optimizing-your-listview。它将解决您的索引问题。 ViewHolder类设置所有视图位置。另请参阅Hold View Objects in a View Holder

的更多说明

Answer 2

尝试此操作并添加其他代码。

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    ViewHolder holder;

    if (convertView == null) {
        convertView = inflater.inflate(R.layout.cart_row, parent, false);
        holder = new ViewHolder();
        holder.decrement = (TextView) convertView.findViewById(R.id.decrement);
        holder.single = (TextView) convertView.findViewById(R.id.single);
        holder.increment = (TextView) convertView.findViewById(R.id.increment);
        holder.cancel = (TextView) convertView.findViewById(R.id.cancel);
        holder.vcmedname = (TextView) convertView.findViewById(R.id.vcmedname);
        holder.vcmedprice = (TextView) convertView.findViewById(R.id.vcmedprice);

        convertView.setTag(holder);
    }
    else {
        holder = (ViewHolder) convertView.getTag();
    }
        Typeface carttext = Typeface.createFromAsset(cartcontext.getAssets(), "fonts/fontawesome.ttf");
        holder.decrement.setTypeface(carttext);
        holder.increment.setTypeface(carttext);
        holder.cancel.setTypeface(carttext);

    MobiData newcart = cartlist.get(position);
    holder.vcmedname.setText(newcart.getVcmedname());
    holder.vcmedprice.setText(newcart.getVcmedprice());
    holder.single.setText(newcart.getVcqty());
    final String cartids = newcart.getVcmedid();

    holder.cancel.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            cartlist.remove(position);
            notifyDataSetChanged();
        }
    });
    return convertView;
}

static class ViewHolder {

  private TextView decrement;
  private TextView single;
  private TextView increment;
  private TextView vcmedname;
  private TextView vcmedprice;

 }

预定在一行上的更改，但效果显示在下一行

2 个答案: