Java 如何格式化字符串数字以在 android 编辑字段中包含逗号

How can I format a String number to have commas in android Edit Field

提问by user1082964

For what function I can use in android to display the number into different formats.

我可以在android中使用什么功能将数字显示为不同的格式。

For eg: If I enter 1000 then it should display like this 1,000. If I enter 10000 then it should display like this 10,000. If I enter 1000000 then it should display like this 1,000,000.

例如：如果我输入 1000，那么它应该像这样显示 1,000。如果我输入 10000，那么它应该像这样显示 10,000。如果我输入 1000000，那么它应该像这样显示 1,000,000。

Please guide me.

请指导我。

采纳答案by Neil

You could use DecimalFormatand just format the number

您可以使用DecimalFormat并格式化数字

DecimalFormat formatter = new DecimalFormat("#,###,###");
String yourFormattedString = formatter.format(100000);

The result will be

结果将是

• 1,000,000for 1000000
• 10,000for 10000
• 1,000for 1000

• 1,000,0001000000
• 10,00010000
• 1,0001000

Update 12/02/2019

更新 12/02/2019

This String.format("%,d", number)would be a better(less hardcoded) solution as indicated in the comments below by @DreaminginCode so I thought I would add it here as an alternative

这String.format("%,d", number)将是一个更好（更少硬编码）的解决方案，如@DreaminginCode 在下面的评论中所示，所以我想我会在这里添加它作为替代

回答by Sandeep

try this one hope it will help.

试试这个希望它会有所帮助。

 System.out.println(NumberFormat.getNumberInstance(Locale.US).format(1000));

回答by Eldhose M Babu

Add a text change listener as below (Also make sure that the input type selected for Edittext is Number) :

添加一个文本更改侦听器，如下所示（还要确保为 Edittext 选择的输入类型是数字）：

etTest.addTextChangedListener(new TextWatcher() {

        boolean isManualChange = false;

        @Override
        public void onTextChanged(CharSequence s, int start, int before,
                int count) {
            if (isManualChange) {
                isManualChange = false;
                return;
            }

            try {
                String value = s.toString().replace(",", "");
                String reverseValue = new StringBuilder(value).reverse()
                        .toString();
                StringBuilder finalValue = new StringBuilder();
                for (int i = 1; i <= reverseValue.length(); i++) {
                    char val = reverseValue.charAt(i - 1);
                    finalValue.append(val);
                    if (i % 3 == 0 && i != reverseValue.length() && i > 0) {
                        finalValue.append(",");
                    }
                }
                isManualChange = true;
                etTest.setText(finalValue.reverse());
                etTest.setSelection(finalValue.length());
            } catch (Exception e) {
                // Do nothing since not a number
            }
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable s) {
            // TODO Auto-generated method stub

        }
    });

回答by YLS

private String getFormatedAmount(int amount){
  return NumberFormat.getNumberInstance(Locale.US).format(amount);
}

回答by Codeversed

int[] numbersToFormat = new int[]
  { 1, 10, 100, 10000, 100000, 1000000, 10000000, 100000000, 1000000000 };


for (int number : numbersToFormat) {
  System.out.println(  
    NumberFormat.getNumberInstance(Locale.getDefault()).format(number));
}

OUTPUT

输出

1
10
100
10,000
100,000
1,000,000
10,000,000
100,000,000
1,000,000,000

回答by Nail Shaykhraziev

You can use Numberformat

您可以使用数字格式

public static double getNumberByString(String s) throws ParseException {
    return NumberFormat.getInstance(Locale.getDefault()).parse(s).doubleValue();
}

回答by Kush

Add this function in common class

在公共类中添加此功能

  public static String getFormatedNumber(String number){
        if(!number.isEmpty()) {
            double val = Double.parseDouble(number);
            return NumberFormat.getNumberInstance(Locale.US).format(val);
        }else{
            return "0";
        }
    }

And use that function every where like this:

并在每个地方使用该功能，如下所示：

String newNumber = Utils.getFormatedNumber("10000000");

回答by Atiar Talukdar

public static String formatNumber(int number){
    return NumberFormat.getNumberInstance(Locale.getDefault()).format(number);
}
public static String formatNumber(String number){
    return NumberFormat.getNumberInstance(Locale.getDefault()).format(Integer.parseInt(number));
}