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我有两个按钮 Lay1 和 Lay2。当用户单击时，某些信息将被放入 Listview(lv) 和 textView(inputPrice) 中。当我从 ListView 中删除单个项目时，它从 textView 中的值被正确删除，但是当 ListView 中有两个项目并且我删除单个项目时，TextView 的值返回到 0。它应该仍然具有剩余的值物品。如何在我的 TextView 中保留剩余项目的值？

private double overallTotalproduct;
public static TextView resultTextView;
ArrayList<String> listItems=new ArrayList<String>();
ArrayAdapter<String> adapter;

adapter=new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1,listItems);
setListAdapter(adapter);

ArrayList<String> ai= new ArrayList<String>();
ai = getIntent().getExtras().getStringArrayList("list");
if (ai != null) {listItems.add(ai+"");
adapter.notifyDataSetChanged();}




    final TextView textViewtotalproduct = (TextView) findViewById(R.id.inputPrice);
    resultTextView = (TextView) findViewById(R.id.resultTextView);;



final ListView lv = getListView();
lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
public boolean onItemLongClick(AdapterView<?> av, View v, int pos, long id) {
return onLongListItemClick(v,pos,id);}
protected boolean onLongListItemClick(View v, final int pos, long id) {
final String str=lv.getItemAtPosition(pos).toString();  
Log.i("ListView", "onLongListItemClick string=" + str);
AlertDialog.Builder builder = new  
AlertDialog.Builder(MenuView2Activity.this);
builder.setMessage("Are you sure you want to remove this Item?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id) 
{listItems.remove(pos);
adapter.notifyDataSetChanged();

TextView textviewlay1 =(TextView)findViewById(R.id.m1aa);
String stringl1 = textviewlay1.getText().toString();
Double doubl1 = Double.parseDouble(stringl1);       
TextView textviewp1 = (TextView)findViewById(R.id.inputPrice);
String stringp1 = textviewp1.getText().toString();
Double intp1 = Double.parseDouble(stringp1);
resultl1 = intp1 - doubl1;
textViewtotalproduct.setText(String.valueOf(resultl1));

TextView textviewlay2 =(TextView)findViewById(R.id.m1ab);
String stringl2 = textviewlay2.getText().toString();
Double doubl2 = Double.parseDouble(stringl2);
TextView textviewp2 = (TextView)findViewById(R.id.inputPrice);
String stringp2 = textviewp2.getText().toString();
Double intp2 = Double.parseDouble(stringp2);
double resultl2 = intp2 - doubl2;
textViewtotalproduct.setText(String.valueOf(resultl2));}

})
    .setNegativeButton("No", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int id) {
    dialog.cancel();
    }
    });
    AlertDialog alert = builder.create();
    alert.show();
    return true;
    }
    });





 lay1.setOnClickListener(new OnClickListener() {
  public void onClick(View v) {
   TextView textView1 = (TextView) findViewById(R.id.m1aa);
   String stringm1aa = textView1.getText().toString();
   Double intm1aa = Double.parseDouble(stringm1aa);

   TextView t1 =(TextView)findViewById(R.id.inputPrice);
   String t11 = t1.getText().toString();
   Double int11 = Double.parseDouble(t11);

   listItems.add("1 "+stringm1a+" - "+intm1aa );
   adapter.notifyDataSetChanged();
   overallTotalproduct =  intm1aa + int11 ;
   textViewtotalproduct.setText(String.valueOf(overallTotalproduct));}});

lay2.setOnClickListener(new OnClickListener() {
  public void onClick(View v) {
   TextView textView2 = (TextView) findViewById(R.id.m1ab);
   String stringm1ab = textView2.getText().toString();
   Double intm1ab = Double.parseDouble(stringm1ab);

   TextView t2 =(TextView)findViewById(R.id.inputPrice);
   String t12 = t2.getText().toString();
   Double int12 = Double.parseDouble(t12);

   listItems.add("1"+stringm1b+"-"+ intm1ab);
   adapter.notifyDataSetChanged();
   overallTotalproduct =  intm1ab + int12;
   textViewtotalproduct.setText(String.valueOf(overallTotalproduct));}});
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1 回答 1

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我通过从发送列表中的项目的按钮中删除而不是长按列表项目本身来解决这个问题，从这个问题和我的其他问题中得到了 SO 社区的很多帮助。忽略许多字符串，您会发现这比我最初尝试做的解决方案要好得多，尤其是因为用户在 ListView 中插入了这么多内容后，无论如何都无法看到其中存在的内容。

lay18.setOnLongClickListener(new OnLongClickListener() {
 public boolean onLongClick(View v)                                                    {
  LayoutInflater myLayout = LayoutInflater.from(context);
   final View dialogView = myLayout.inflate(R.layout.alerthelp, null);
   AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);
   alertDialogBuilder.setView(dialogView);
   final AlertDialog alertDialog = alertDialogBuilder.create();



  Button button5 = (Button) dialogView.findViewById(R.id.button5);
   button5.setOnClickListener(new OnClickListener(){
   public void onClick(View v) {

   TextView ss18=(TextView)findViewById(R.id.s18);//change
   String sss18 = ss18.getText().toString();    //change

   TextView texti18 = (TextView)findViewById(R.id.inputPrice);//change
   String stringi18 = texti18.getText().toString();//change
   Double ip18 = Double.parseDouble(stringi18);//change
   if (ip18  > 0){//change
   if (sss18.equals("st")) {//change
   TextView stax18=(TextView)findViewById(R.id.salestax2);//change
   String sax18 = stax18.getText().toString();//change
   double sx18 = Double.parseDouble(sax18);//change
   TextView textviewlay18 =(TextView)findViewById(R.id.m4ac);//change
   String stringl18 = textviewlay18.getText().toString();//change
   Double doubl18 = Double.parseDouble(stringl18);//change
   TextView textviewp18 = (TextView)findViewById(R.id.inputPrice);//change
   String stringp18 = textviewp18.getText().toString();//change
   Double intp18 = Double.parseDouble(stringp18);//change
   double resultl18 = intp18 - (doubl18*sx18);//change
   int precision21t = 100; //keep 4 digits//change
   resultl18= Math.floor(resultl18 * precision21t +.5)/precision21t;//change
   textViewtotalproduct.setText(String.valueOf(resultl18));//change
   if 
   (listItems != null)
   try{
  final String str=lv.getItemAtPosition(pos).toString();
   Log.i("ListView", "onLongListItemClick string=" + str);
   {listItems.remove(pos);
   TextView text18 =(TextView)findViewById(R.id.TextView18);
   dally18=(dally18-1);
   text18.setText(String.valueOf(dally18));
   d18.setText(String.valueOf(dally18));
   adapter.notifyDataSetChanged();
   controller1.deletename(stringl18);}
                    }
                    catch (IndexOutOfBoundsException ex )
                    {
                    }

   alertDialog.dismiss();//change
   }else{
   if (sss18.equals("")) {//change
  TextView textviewlay18 =(TextView)findViewById(R.id.m4ac);//change
  String stringl18 = textviewlay18.getText().toString();//change
  Double doubl18 = Double.parseDouble(stringl18);//change
  TextView textviewp18 = (TextView)findViewById(R.id.inputPrice);//change
  String stringp18 = textviewp18.getText().toString();//change
  Double intp18= Double.parseDouble(stringp18);//change
  double resultl18 = intp18 - doubl18;//change
  int precision21t = 100; //keep 4 digits//change
  resultl18= Math.floor(resultl18 * precision21t +.5)/precision21t;//change
  textViewtotalproduct.setText(String.valueOf(resultl18));//change
   if 
  (listItems != null)
   try{
                    final String str=lv.getItemAtPosition(pos).toString();
                    Log.i("ListView", "onLongListItemClick string=" + str);
                    {listItems.remove(pos);
                    TextView text18 =(TextView)findViewById(R.id.TextView18);
                    dally18=(dally18-1);
                    text18.setText(String.valueOf(dally18));
                    d18.setText(String.valueOf(dally18));
                    adapter.notifyDataSetChanged();
                    controller1.deletename(stringl18);}
                    }
                    catch (IndexOutOfBoundsException ex )
                    {
                    }
                        alertDialog.dismiss();}}}}});                   



                        alertDialog.show();
                        return true;}});
于 2013-07-21T12:20:49.033 回答