我有两个按钮Lay1和Lay2。当用户点击时，某些信息被放入Listview（lv）和textView（inputPrice）。当我从ListView删除单个项目时，它从textView的值被正确删除但当ListView中的两个项目并且我删除单个项目时，TextView的值返回0.它应该仍然具有剩余的值项目。如何在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));}});
答案 0 :(得分：0)
我通过SO社区的大量帮助解决了这个问题以及我的其他问题，删除了从列表中发送项目的按钮，而不是长按列表项目本身。忽略许多字符串，你会发现这是一个比我最初尝试做的更好的解决方案，特别是因为用户无法在看到如此多的插入之后总是看到ListView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;}});