Question

这是我的listview，我的问题是为什么我试图点击我的ImageButton（在listview中），但textview（在listview中）永远不会改变我想要的值。这需要我整个上午，有人可以帮助我，谢谢。

 public class ViewAdapter extends BaseAdapter implements Filterable {

        LayoutInflater mInflater;

        public ViewAdapter() {
            mInflater = LayoutInflater.from(getActivity());
        }

        @Override
        public int getCount() {
            return pl.size();
        }

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

        @Override
        public long getItemId(int position) {
            return position;
        }

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

            if (convertView == null) {
                convertView = mInflater.inflate(R.layout.listproduct, null);
            }
            final TextView ProductCode = (TextView) convertView.findViewById(R.id.productcode);
            ProductCode.setText("" + pl.get(position).getProductCode());
            final TextView Qty = (TextView) convertView.findViewById(R.id.qty);
            Qty.setText("" + pl.get(position).getQty());
            final TextView Description = (TextView) convertView.findViewById(R.id.description);
            Description.setText("" + pl.get(position).getProductName());
            final String p = Description.getText().toString();
            final TextView Price = (TextView) convertView.findViewById(R.id.price);
            Price.setText("" + pl.get(position).getProductPrice());
            final ImageButton minus = (ImageButton) convertView.findViewById(R.id.minus);

            minus.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                     Qty.setText("testing")// textview never change to "testing"
                }
            });
            notifyDataSetChanged();
            return convertView;
        }

Answer 1

基本上你应该使用RecyclerView，但如果你仍想使用listView，请使用以下链接中的view-holder方法：

Optimize list view

你应该永远不要在getView方法中调用notifyDataSetChanged()作为你的列表视图滚动的多次调用

Answer 2

请尝试使用持有人的代码，如下所示

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

    ViewHolder holder;

    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.list_entry, null);
        holder = new ViewHolder();
        holder.nameTextView = (TextView) convertView.findViewById(R.id.person_name);
        holder.surnameTextView = (TextView) convertView.findViewById(R.id.person_surname);
        holder.personImageView = (ImageView) convertView.findViewById(R.id.person_image);
        convertView.setTag(holder);
    }
    else {
        holder = (ViewHolder) convertView.getTag();
    }

    Person person = getItem(position);

    holder.nameTextView.setText(person.getName());
    holder.surnameTextView.setText(person.getSurname());
    //holder.personImageView.setImageBitmap(person.getImage());

    return convertView;
}

然后点击以下

holder.personImageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                 holder.nameTextView.setText("testing")// textview never change to "testing"
            }
        });

Answer 3

Use this code : 





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

                    if (convertView == null) {
                        convertView = mInflater.inflate(R.layout.listproduct, null);
                    }
                    final TextView ProductCode = (TextView) convertView.findViewById(R.id.productcode);
                    ProductCode.setText("" + pl.get(position).getProductCode());
                    final TextView Qty = (TextView) convertView.findViewById(R.id.qty);

                    final TextView Description = (TextView) convertView.findViewById(R.id.description);
                    Description.setText("" + pl.get(position).getProductName());
                    final String p = Description.getText().toString();
                    final TextView Price = (TextView) convertView.findViewById(R.id.price);
                    Price.setText("" + pl.get(position).getProductPrice());
                    ImageButton minus = (ImageButton) convertView.findViewById(R.id.minus);
                     minus.setTag(position);
                    minus.setOnClickListener(clickButton);

                    return convertView;
                }

          private View.OnClickListener clickButton = new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Object tag =v.getTag();
                   if(tag!=null)
                  {
                  int pos = (Integer)tag;
               Qty.setText(pl.get(position).getQty());
              notifyDataSetChanged();


        }
                }
            } ;

Answer 4

据我所知，这个问题无法解决，因为一旦你在自定义 listView 中填充数据，你就重新创建了它，或者再次用文本调用自定义 listView 显示你想改变！

如何通过单击ListView中的ImageButton来更改我的TextView值

4 个答案: