android - Spinners 选择在添加新项目或滚动 ListView android 时发生变化

Question

我在自定义适配器 ListView 上添加了两个微调器。一切都很好，但是当我将新项目添加到 ListView 时，前一个项目的微调器的值将转换为新项目。在滚动 ListView 时，微调器的值也会旋转。请提供任何帮助。

public class CustomAdapter extends BaseAdapter {
    private ArrayList<MyMessageDetails> _data;
    Context _c;
     ProductsItemViewHolder holder;
    CustomAdapter (ArrayList<MyMessageDetails> data, Context c){
        _data = data;
        _c = c;
    }

    public int getCount() {
        // TODO Auto-generated method stub
        return _data.size();
    }

    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return _data.get(position);
    }

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

    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

        View v = convertView;
        final MyMessageDetails msg = _data.get(position);
        if (v == null)
        {
            LayoutInflater vi = (LayoutInflater)_c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = vi.inflate(R.layout.listview_item_row, null);
            holder = new ProductsItemViewHolder();
            holder.image = (ImageView) v.findViewById(R.id.icon);
            holder.fromView = (TextView) v.findViewById(R.id.textView1);
            holder.spinnersizes = (Spinner) v.findViewById(R.id.spinner1);
            holder.spinnercopies = (Spinner) v.findViewById(R.id.spinner2);
            String Photo_copies[];
            Photo_copies=new String[100];
            int x = 1;
            while( x < 101 ) {
                if(x == 1){
                    Photo_copies[x-1]= String.valueOf(x) + " Copy";
                }else{
                    Photo_copies[x-1]= String.valueOf(x) + " Copies";
                }

                x++;
            }

            String array_spinner[];
            array_spinner=new String[5];
            array_spinner[0]="4x6|Plastic|RS 20";
            array_spinner[1]="option 2";
            array_spinner[2]="option 3";
            array_spinner[3]="option 4";
            array_spinner[4]="option 5";

            ArrayAdapter adapter = new ArrayAdapter(_c,android.R.layout.simple_spinner_item, array_spinner);
            ArrayAdapter adapter2 = new ArrayAdapter(_c,android.R.layout.simple_spinner_item, Photo_copies);
            holder.spinnersizes.setAdapter(adapter);
            holder.spinnercopies.setAdapter(adapter2);
            holder.spinnercopies.setOnItemSelectedListener(new OnItemSelectedListener() {
                @Override
                public void onItemSelected(AdapterView<?> parentView, View v, int position, long id) {
                    String sizes = holder.spinnersizes.getSelectedItem().toString();
                    holder.spinnersizes.setTag(position);
                    String copies = holder.spinnercopies.getSelectedItem().toString();                 
                    String  mycopies = copies;
                    String  myprice = sizes;
                    myprice = myprice.substring(myprice.lastIndexOf(" ") + 1);
                    mycopies = mycopies.substring(0, mycopies.lastIndexOf(" "));
                    int finalprice = Integer.parseInt(myprice) * Integer.parseInt(mycopies);
                    holder.fromView.setText(holder.image.getTag().toString() + " Copies:" + mycopies + " Price:" + finalprice);
                    msg.setCopies(mycopies);
                    msg.setSize(String.valueOf(finalprice));
                    //  lab_gallery.Calculate_Bill();

                }

                @Override
                public void onNothingSelected(AdapterView<?> parentView) {

                }

            });

            holder.spinnersizes.setOnItemSelectedListener(new OnItemSelectedListener() {
                @Override
                public void onItemSelected(AdapterView<?> parentView, View v, int position, long id) {
                    // your code here
                    String sizes = holder.spinnersizes.getSelectedItem().toString();    
                    holder.spinnersizes.setTag(position);
                    String copies = holder.spinnercopies.getSelectedItem().toString();

                    String  mycopies = copies;
                    String  myprice = sizes;
                    myprice = myprice.substring(myprice.lastIndexOf(" ") + 1);
                    mycopies = mycopies.substring(0, mycopies.lastIndexOf(" "));
                    int finalprice = Integer.parseInt(myprice) * Integer.parseInt(mycopies);
                    holder.fromView.setText(holder.image.getTag().toString() + " Copies:" + mycopies + " Price:" + finalprice);
                    msg.setCopies(mycopies);
                    msg.setSize(String.valueOf(finalprice));
                }

                @Override
                public void onNothingSelected(AdapterView<?> parentView) {

                }

            });
            holder.image.setImageBitmap(msg.getIcon());
            holder.fromView.setTag(msg.getUrl());
            holder.fromView.setText(msg.getName()); 
            holder.image.setTag(msg.getName());
            msg.setCopies("1");
            msg.setSize("20");
            v.setTag(holder);

        } else {
            holder = (ProductsItemViewHolder) v.getTag();
        }


        if (holder.spinnersizes.getTag() != null){
            holder.spinnersizes.setSelection(Integer.parseInt(holder.spinnersizes.getTag().toString()));
        }

        //image.setScaleType(ScaleType.FIT_XY);


        return v;

    }
    static class ProductsItemViewHolder {

        ImageView image;
        TextView fromView;
        Spinner spinnersizes;
        Spinner spinnercopies;
    }
}

Answer 1

这是因为 View 回收。 View 与最后一个状态一起回收。如果您的微调器选择了一些东西，并且如果该 View 被重用，它也会选择微调器的状态。您需要添加逻辑来保存微调器的状态。您可以维护一个包含行位置和 selectedIndex 的字典。

//类级别字段

Map<Integer, Integer> myMap = new HashMap<Integer, Integer>();

在您的 getView() 方法中检查我们是否在该行位置为微调器保存了状态

if (myMap.containsKey(position)) {
   spinner.setSelection(myMap.get(position));
} 

在微调器中选择项目时保存状态

@Override
public void onItemSelected(AdapterView<?> parentView, View v, int selectedIndex, long id) {
//...
 myMap.put(position, selectedIndex);
//...
}