在listview中的addTextChangedListener中使用自定义列表适配器

问题描述 投票：0回答：3

我正在开发创建发票的应用程序。用户必须添加项目列表并设置数量。数据将添加到listview.for我使用自定义列表适配器扩展基本适配器。对于第一项如果用户为item.qty选择数量为15（例如），如图15所示，直到添加下一项。如果添加另一个，则先前设置的数量更改为当前的。我在自定义列表适配器中使用addTextChangedListener。我使用addTextChangedListener更改了所有受影响的行的数量。我正在使用自定义适配器来填充列表视图。列表视图中的每一行都有3个文本视图（自定义布局）和用于输入数量的编辑文本。另一个问题是当滚动ListView时，值会在编辑文本中自动重复/更改。为什么？

这是我的主要课程，

public class SalesTransactionFragment extends SherlockFragment {
    Button b1,b2,b3;
    TextView tvcusid,tvcusname,tvtotal;
    ListView lv;
    public static itemlistadapter itadapter;
    static ArrayList<Items>  item ;
    Items it;

    String cus_id,c_name;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // Get the view from fragmenttab3.xml
          View view = inflater.inflate(R.layout.salesform, container, false);
          return view;

    }

   @Override
public void onActivityCreated(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onActivityCreated(savedInstanceState);
    b1=(Button) getActivity().findViewById(R.id.sfbtncus);
    b2=(Button) getActivity().findViewById(R.id.sfbtnadd);
    b3=(Button) getActivity().findViewById(R.id.sfbtfinish);
    itadapter=null;
  it=new Items();
    tvcusid=(TextView) getActivity().findViewById(R.id.sftvcusid);
    tvcusname=(TextView) getActivity().findViewById(R.id.sftvcusname);
    tvtotal=(TextView) getActivity().findViewById(R.id.sftotal);
    lv=(ListView) getActivity().findViewById(R.id.sflvitem);
    lv.setTranscriptMode(lv.TRANSCRIPT_MODE_ALWAYS_SCROLL);
    item = new ArrayList<Items>();

    b1.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent i = new Intent(getActivity(), CustomerSelect.class);
            startActivityForResult(i, 1);   
//          Intent i = new Intent(SalesFormActivity.this, CustomerSelect.class);
//          i.putExtra("cussel", "true");
//          startActivityForResult(i, 0);   
        //  Toast.makeText(getActivity(), "CustomerSelect",Toast.LENGTH_LONG).show();
        }
    });
    b2.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
//          
            Intent i = new Intent(getActivity(), ItemsView.class);
            startActivityForResult(i, 0);           
//          Toast.makeText(getActivity(), "AddItem",Toast.LENGTH_LONG).show();

        }
    });
    b3.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
        //  Toast.makeText(getActivity(), "Finish",Toast.LENGTH_LONG).show();

             if(itadapter==null)
                {
                        Toast.makeText(getActivity(), "Must select a item", Toast.LENGTH_LONG).show();

                }
         else if(cus_id!=null&&itadapter!=null){
                Intent i=new Intent(getActivity(), Invoice.class);
            i.putExtra("cus_id", cus_id);

                i.putExtra("c_name", c_name);

                startActivity(i);
//                getActivity().finish();

            }
            else if (cus_id==null)
            {
                Toast.makeText(getActivity(), "Must select a customer", Toast.LENGTH_LONG).show();
            }




        }
    });
}
   @Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(data!=null)
    switch (requestCode) {
//      case 0:
//          cus_id=data.getStringExtra("cus_id");
//          c_name=data.getStringExtra("c_name");
//          tvcusid.setText(cus_id);
//          tvcusname.setText(c_name);
//          
//          break;
    case 0:
        it=new Items();
        it.setitemname(data.getStringExtra("name"));
        it.setprice(data.getDoubleExtra("price",0));
        it.setid(data.getIntExtra("item_id", 0));
        if(itadapter==null){
            item.add(it);
            itadapter=new itemlistadapter(item, getActivity());
            lv.setAdapter(itadapter);
            lv.setSelection(itadapter.getCount()-1);

        }else{

            itadapter.addItems(it);
        }
        if(itadapter!=null){
            tvtotal.setText(""+itadapter.gettotal());
        }
        break;
    case 1:
        cus_id=data.getStringExtra("cusid");
        c_name=data.getStringExtra("cusname");
        tvcusid.setText(cus_id);
        tvcusname.setText(c_name);

        break;
    default:
        break;
    }


   }
   @Override
public void onResume() {
    super.onResume();
}

这是适配器类，

public class itemlistadapter extends BaseAdapter implements Filterable {

    ArrayList<Items> item;
    ArrayList<Items> history;
    HashMap<Integer, Double> prices;
    Context con;
    double grantTotal = 0;

    public itemlistadapter(ArrayList<Items> item, Context con) {
        super();
        this.item = item;
        this.con = con;
        history = (ArrayList<Items>) item.clone();
        prices = new HashMap<Integer, Double>();
    }

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

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            LayoutInflater lvinflat = (LayoutInflater) con
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = lvinflat.inflate(R.layout.singlesalelist, parent,
                    false);
        }
        final int pos = position;
        final TextView tvitem = (TextView) convertView
                .findViewById(R.id.sinlvtvname);
        final TextView price = (TextView) convertView
                .findViewById(R.id.sinlvtvprice);

        final EditText qty = (EditText) convertView
                .findViewById(R.id.sinlvetqty);
        if (pos == item.size() - 1) {
            // Log.d("focusposition",
            // ""+pos+"qty.requestFocus()"+qty.requestFocus());
            qty.requestFocus();
        }
        final TextView tvtotal = (TextView) convertView
                .findViewById(R.id.sinlvtvtotal);
        tvitem.setText(item.get(position).getitemname());

        price.setText("" + item.get(position).getprice());

        qty.setText("" + item.get(pos).getqty());
        Log.d("position", "" + pos + "qty" + item.get(position).getqty());

//      if (qty.length() != 0) {
//          int qnty = Integer.parseInt(qty.getText().toString());
//      //  item.get(pos).setqty(qnty);
//      //  Log.d("positionqty.length() != 0:", ""+pos+"qty"+item.get(position).getqty());
//
//          double unitp = Double.parseDouble(price.getText().toString());
//          double total = (qnty * unitp);
//          tvtotal.setText("" + total);
//          prices.put(pos, total);
//      } else {
//
//          tvtotal.setText("" + 0);
//      }
        qty.addTextChangedListener(new TextWatcher() {

            @Override
            public void onTextChanged(CharSequence s, int start, int before,
                    int count) {

                Log.d("On text changed", s+",Start:"+start+",count:"+count+",before:"+before);
                if (s.length() != 0) {
                    int qnty = Integer.parseInt(s.toString());
                    item.get(pos).setqty(qnty);
                    Log.d("position in ChangedListener", ""+pos+"qty"+item.get(pos).getqty()+"qnty"+qnty);

                    double unitp = Double.parseDouble(price.getText()
                            .toString());
                    double total = (qnty * unitp);
                    tvtotal.setText("" + total);
                    prices.put(pos, total);
                } else {

                    tvtotal.setText("" + 0);
                }
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,
                    int after) {
                Log.d("Before text changed", s+",Start:"+start+",count:"+count+",after:"+after);

            }

            @Override
            public void afterTextChanged(Editable s) {

                Log.d("After text changed", s+"");
            }
        });

        if (tvtotal.getText().equals("total")||tvtotal.getText().equals("Total"))
            tvtotal.setText(price.getText());
        try{
        prices.put(pos, Double.parseDouble(tvtotal.getText().toString()));
        }catch(NumberFormatException e){
            //TODO
        }
        return convertView;
    }

    public void addItems(Items i) {
        item.add(i);
        notifyDataSetChanged();
    }

    public ArrayList<Items> getItems() {
        return item;
    }

    public double gettotal() {
        grantTotal = 0;
        for (int i = 0; i < prices.size(); i++) {
            grantTotal += prices.get(i);
        }
        return grantTotal;
    }

    Filter my_filter = new Filter() {

        @SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint,
                FilterResults results) {
            item = (ArrayList<Items>) results.values;
            if (results.count > 0) {
                notifyDataSetChanged();
            } else {
                notifyDataSetInvalidated();
            }

        }

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            Log.d("insitefilterresults", "msg");
            FilterResults filter_results = new FilterResults();
            ArrayList<Items> arr = new ArrayList<Items>();
            if (constraint != null && history != null) {
                for (Items s : history) {
                    if (s.getitemname().startsWith(constraint.toString()))
                        arr.add(s);
                }
                filter_results.values = arr;
                filter_results.count = arr.size();
            }
            return filter_results;
        }
    };

    @Override
    public Filter getFilter() {
        Log.d("insitegetFilte", "msg");

        // TODO Auto-generated method stub
        return my_filter;
    }

}

LogCat是，

03-27 05:18:57.692: D/Before text changed(409): 1,Start:1,count:0,after:1
03-27 05:18:57.692: D/Before text changed(409): 1,Start:1,count:0,after:1
03-27 05:18:57.702: D/On text changed(409): 15,Start:1,count:1,before:0
03-27 05:18:57.702: D/position in ChangedListener(409): 0qty15qnty15
03-27 05:18:57.722: D/On text changed(409): 15,Start:1,count:1,before:0
03-27 05:18:57.732: D/position in ChangedListener(409): 1qty15qnty15
03-27 05:18:57.742: D/After text changed(409): 15
03-27 05:18:57.742: D/After text changed(409): 15

请帮帮我解决这个问题。将不胜感激。谢谢。

android listview baseadapter
3个回答
0
投票

我认为这不是问题我认为你有所有数据的数组列表所以当你在文本观察器中计算某些内容时那时你必须将arraylist数据更新为你的新数据计算数据你只需使用put更新功能，因为你知道每次更新时的位置值，当你更改值时就足够了

0
投票

在qty.addTextChangedListener之后的prices.put(pos, total);里面

添加这段代码。

((BaseAdapter) lv.getAdapter()).notifyDataSetChanged();

0
投票

在getView方法中，参数位置给出了新创建的childView的位置，而不是单击的childView的位置

所以，你需要获得正确的位置编号..

查看此链接以获取完整的详细信息，Custom ListView adapter. TextChangedListener calls for wrong EditText

另一个有用的帖子是Android - EditTexts within ListView bound to Custom ArrayAdapter - keeping track of changes

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