我有一个字符串arraylist,其数字如 [" 51,073"," 51,074"," 51,073"] 现在我想将其转换为Double ArrayList
并计算数组列表中数字的总和。
以下是代码:
private ArrayList<String> totals = new ArrayList<>();
private ArrayList<Double> demototal = new ArrayList<>();
String total = itemData.getString(ParseBarcode.KEY_TOTAL);
totals.add(total);
/*converting all values from totals array to Double and add to arraylist demototal*/
for (int i = 0; i < totals.size(); i++) {
final String value = totals.get(i);
double total_ary = Double.parseDouble(value);
demototal.add(total_ary);
}
String amount = ""+setArrayListElement(demototal);
textViewSum.setText(amount);//set total text to amount
//calculate amount here we pass setArrayListElement as Double arraylist
private Double setArrayListElement(ArrayList inArray) {
Double amount = 0.0d;
for (int i = 0; i < inArray.size(); i++) {
amount = amount + Double.valueOf((Double) inArray.get(i));
}
return amount;
}
这给了我java.lang.NumberFormatException: Invalid double: "51,073"
例外。
为了更加清晰,我正在添加更多代码。
private void showItem(String json) {
String itembarcode = "";
String itemdesc = "";
String weight = "";
String rate = "";
String making = "";
String netrate = "";
String total = "";
try {
JSONObject jsonObject = new JSONObject(json);
JSONArray result = jsonObject.getJSONArray(ParseBarcode.JSON_ARRAY);
JSONObject itemData = result.getJSONObject(0);
itembarcode = itemData.getString(ParseBarcode.KEY_BARCODE);
itemdesc = itemData.getString(ParseBarcode.KEY_DESC);
weight = itemData.getString(ParseBarcode.KEY_WEIGHT);
rate = itemData.getString(ParseBarcode.KEY_RATE);
making = itemData.getString(ParseBarcode.KEY_MAKING);
netrate = itemData.getString(ParseBarcode.KEY_NETRATE);
total = itemData.getString(ParseBarcode.KEY_TOTAL);
} catch (JSONException e) {
e.printStackTrace();
}
//table started
TableLayout.LayoutParams tableParams = new TableLayout.LayoutParams(TableLayout.LayoutParams.MATCH_PARENT, TableLayout.LayoutParams.WRAP_CONTENT);
TableRow.LayoutParams rowParams = new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT, 1f);
rowParams.setMargins(16, 0, 16, 0);
TableLayout tableLayout = new TableLayout(AddInvEst.this);
tableLayout.setLayoutParams(tableParams);
TableRow newRow = new TableRow(AddInvEst.this);
newRow.setLayoutParams(tableParams);
barCode = new TextView(AddInvEst.this);
barCode.setLayoutParams(rowParams);
barCode.setGravity(Gravity.CENTER);
itemDesc = new TextView(AddInvEst.this);
itemDesc.setLayoutParams(rowParams);
itemDesc.setGravity(Gravity.CENTER);
weightLine = new TextView(AddInvEst.this);
weightLine.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT, 0.75f));
weightLine.setGravity(Gravity.CENTER);
rateAmount = new EditText(AddInvEst.this);
rateAmount.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT, 0.5f));
rateAmount.setGravity(Gravity.CENTER);
rateAmount.addTextChangedListener(rateTextWatcher);
makingAmount = new EditText(AddInvEst.this);
makingAmount.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT, 0.5f));
makingAmount.setGravity(Gravity.CENTER);
makingAmount.addTextChangedListener(mkAmountTextWatcher);
netRate = new TextView(AddInvEst.this);
netRate.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT, 0.5f));
netRate.setGravity(Gravity.CENTER);
netrates.add(netrate);
itemtotal = new TextView(AddInvEst.this);
itemtotal.setLayoutParams(rowParams);
itemtotal.setGravity(Gravity.CENTER);
totals.add(total);
//converting all values from totals array to Double and add to arraylist demototal
for (int i = 0; i < totals.size(); i++) {
final String value = totals.get(i);
double total_ary = Double.parseDouble(value.replace(",","."));
demototal.add(total_ary);
}
barCode.setText(itembarcode);
itemDesc.setText(itemdesc);
weightLine.setText(weight);
rateAmount.setText(rate);
makingAmount.setText(making);
netRate.setText(netrate);
itemtotal.setText(total);
String amount = ""+setArrayListElement(demototal);
textViewSum.setText(amount);//set total text to amount
newRow.addView(barCode);
newRow.addView(itemDesc);
newRow.addView(weightLine);
newRow.addView(rateAmount);
newRow.addView(makingAmount);
newRow.addView(netRate);
newRow.addView(itemtotal);
itemTable.addView(newRow);
}
//calculate amount here we pass setArrayListElement as Double arraylist
private Double setArrayListElement(ArrayList inArray) {
Double amount = 0.0d;
for (int i = 0; i < inArray.size(); i++) {
amount = amount + Double.valueOf((Double) inArray.get(i));
}
return amount;
}
这是textwatcher的代码并计算netrate和item total。
private void calculateAndShow(double wt, double rt, double mk) {
String w = weightLine.getText().toString();
wt = Double.parseDouble(w);
double NetRate = rt + mk;
double Total = (NetRate / 10) * wt;
netRate.setText(NetRate + "");
itemtotal.setText(Total + "");
}
private TextWatcher rateTextWatcher = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
String rate = rateAmount.getText().toString();
rt = Double.parseDouble(rate);
calculateAndShow(wt, rt, mk);
rates.add(rate);
}
};
private TextWatcher mkAmountTextWatcher = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
String mkAmt = makingAmount.getText().toString();
mk = Double.parseDouble(mkAmt);
calculateAndShow(wt, rt, mk);
mkCharges.add(mkAmt);
}
};
答案 0 :(得分:4)
你不能用你的价值来解析双重
尝试:
double total_ary = Double.parseDouble(value.replace(",","."));
答案 1 :(得分:2)
ArrayList<String> hello = new ArrayList<>();
double[] bye = new double[hello.size()];
for (int i = 0; i < hello.size(); ++i) {
bye[i] = Double.parseDouble(hello.get(i));
}
答案 2 :(得分:0)
在Double.parseDouble(value) replace
之前,“with”。“
答案 3 :(得分:0)
尝试:
List<Double> list2 = totals.stream().map(c -> c.replace(",",".")).map(Double::parseDouble).collect(Collectors.toList());
Double sum = list2.stream().reduce((x,y)->x+y).get();
或者如果你只想要总和:
Double sum = totals.stream.map(c -> c.replace(",",".")).map(Double::parseDouble).reduce((x,y)->x+y).get();