这里我想基于来自excel的数据动态地将行（自定义布局）添加到ArrayList。一切正常工作，除了我只获得ArrayAdapter的最后一个值。
首先，这是我的实例变量的声明：
List<Record> model = new ArrayList<Record>();
RecordAdapter adapter = null;
这是代码的一部分，我认为这是一个有问题的领域。
class RecordAdapter extends ArrayAdapter<Record> {
RecordAdapter() {
super(Census.this, R.layout.row, model);
}
public View getView(int position, View convertView,
ViewGroup parent) {
View row = convertView;
RecordHolder holder = null;
if (row == null) {
LayoutInflater inflater = getLayoutInflater();
row = inflater.inflate(R.layout.row, parent, false);
holder = new RecordHolder(row);
row.setTag(holder);
} else {
holder = (RecordHolder) row.getTag();
}
holder.populateFrom(model.get(position));
return (row);
}
}
这是RecordHolder类：
static class RecordHolder {
TextView tvEntryNo = null;
TextView tvPNO = null;
TextView tvDefoliator = null;
TextView tvLpF = null;
CheckBox cbOryctes = null;
CheckBox cbTermite = null;
CheckBox cbRat = null;
private ImageView icon = null;
RecordHolder(View row) {
tvEntryNo = (TextView) row.findViewById(R.id.tvEntry);
tvPNO = (TextView) row.findViewById(R.id.tvPNO);
tvDefoliator = (TextView) row.findViewById(R.id.tvDefoliator);
tvLpF = (TextView) row.findViewById(R.id.tvLpF);
cbOryctes = (CheckBox) row.findViewById(R.id.cbOryctes);
cbTermite = (CheckBox) row.findViewById(R.id.cbTermite);
cbRat = (CheckBox) row.findViewById(R.id.cbRat);
icon = (ImageView) row.findViewById(R.id.icon);
}
void populateFrom(Record r) {
tvEntryNo.setText("Pokok ke: " + r.getEntryNo());
tvPNO.setText("PNO: " + r.getPNO());
tvDefoliator.setText("Species: " + r.getDefSpec());
tvLpF.setText("Larva: " + r.getLpF());
int temp = 0;
int counter = 0;
if (r.isOrycDmg()) {
cbOryctes.setChecked(true);
} else {
cbOryctes.setChecked(false);
}
if (r.isTermiteDmg()) {
cbTermite.setChecked(true);
} else {
cbTermite.setChecked(false);
}
if (r.isRatDmg()) {
cbRat.setChecked(true);
} else {
cbRat.setChecked(false);
}
if ((r.getDefSpec() == "Setora Nitens" || r.getDefSpec() == "Setothosea Asigna" ||
r.getDefSpec() == "Mahasena Corbetti") && Integer.parseInt(r.getLpF().toString()) > 5) {
counter++;
}
if (!r.getLpF().trim().equals("")) {
temp = Integer.parseInt(r.getLpF());
}
if (temp > 10) {
counter++;
}
if (r.isOrycDmg()) {
counter++;
}
if (r.isTermiteDmg()) {
counter++;
}
if (r.isRatDmg()) {
counter++;
}
if (r.getPnD_Time().trim().equals("")) {
//New Data
icon.setImageResource(R.drawable.add);
} else if (counter == 0) {
//Negligible problem
icon.setImageResource(R.drawable.green_alert);
} else if (counter == 1) {
//need attention, minor problem
icon.setImageResource(R.drawable.yellow_alert);
} else {
//serious problem
icon.setImageResource(R.drawable.red_alert);
}
}
}
这是我用来从excel文件加载数据的loadData（）方法：
public void loadData() {
//Instantiate holder
Record r = new Record();
try {
//get the excel file
workbook = new HSSFWorkbook(file);
sheet = workbook.getSheetAt(0);
//parse data from excel to holder
for (int i = FIRST_ROW_TO_GET; i <= (sheet.getLastRowNum() + 1); i++) {
Row row = sheet.getRow(i);
//New Data
if (row == null) {
r.setFormNo(filename(fileName));
r.setEntryNo(String.valueOf(i));
r.setPNO("Data Baru");
r.setDefSpec("Tidak Ada");
r.setLpF("");
r.setOrycDmg(false);
r.setTermiteDmg(false);
r.setRatDmg(false);
r.setSampler("");
r.setPnD_Date("");
r.setPnD_Time("");
} else {
//Existing Data
for (int cn = row.getFirstCellNum(); cn <= row.getLastCellNum(); cn++) {
Cell c = row.getCell(cn, Row.RETURN_BLANK_AS_NULL);
//Blank cells handler
if (c == null) {
switch (cn) {
case 0:
r.setFormNo(filename(fileName));
break;
case 1:
r.setEntryNo(String.valueOf(i));
break;
case 2:
r.setPNO("Data Baru");
break;
case 3:
r.setDefSpec("Tidak Ada");
break;
case 4:
r.setLpF("");
break;
case 5:
r.setOrycDmg(false);
break;
case 6:
r.setTermiteDmg(false);
break;
case 7:
r.setRatDmg(false);
break;
case 8:
r.setSampler("");
break;
case 9:
r.setPnD_Date("");
break;
case 10:
r.setPnD_Time("");
break;
}
} else {
//non empty cells handler
switch (cn) {
case 0:
r.setFormNo(c.getStringCellValue());
break;
case 1:
r.setEntryNo(c.getStringCellValue());
break;
case 2:
r.setPNO(c.getStringCellValue());
break;
case 3:
r.setDefSpec(c.getStringCellValue());
break;
case 4:
r.setLpF(c.getStringCellValue());
break;
case 5:
if (Integer.parseInt(c.getStringCellValue()) == 1)
r.setOrycDmg(true);
else
r.setOrycDmg(false);
break;
case 6:
if (Integer.parseInt(c.getStringCellValue()) == 1)
r.setTermiteDmg(true);
else
r.setTermiteDmg(false);
break;
case 7:
if (Integer.parseInt(c.getStringCellValue()) == 1)
r.setRatDmg(true);
else
r.setRatDmg(false);
break;
case 8:
r.setSampler(c.getStringCellValue());
break;
case 9:
r.setPnD_Date(c.getStringCellValue());
break;
case 10:
r.setPnD_Time(c.getStringCellValue());
break;
}
}
}
}
adapter.add(r);
}
} catch (IOException e) {
e.printStackTrace();
}
}
Record.java只包含变量声明。应用程序编译得很好，但我遇到一个问题，它只使用LoadData（）循环的最后一个值填充ListView。我怀疑问题来自我的getView（）方法。有人可以帮助指出我可能犯错误的地方吗？
我很乐意提供所需的其他代码。提前致谢。 ：）
答案 0 :(得分：1)
您需要在循环中初始化一个新的Record对象。否则，它将更新同一个对象并为每一行显示相同的数据。
public void loadData() {
try {
//get the excel file
workbook = new HSSFWorkbook(file);
sheet = workbook.getSheetAt(0);
//parse data from excel to holder
for (int i = FIRST_ROW_TO_GET; i <= (sheet.getLastRowNum() + 1); i++) {
Record r = new Record(); // move this HERE
Row row = sheet.getRow(i);
...
...