How to Automatically add thousand separators as number is input in EditText

Question

Im creating a convertor application, I want to set the EditText so that when the user is inputting the number to be converted, a thousand separator (,) should be added autom

Answer 1

I know i am very late to the party but it may be very useful for future users. My answer is an extension of Shree Krishna's answer.

Improvements:

1. Thousands separators and Decimal markers are locale aware i.e. they are used accordingly to the Locale of the device.
2. The cursor position doesn't change after deleting or adding elements in the middle also (In his answer cursor was reset to the end).
3. The overall quality of the code has been improved specially the getDecimalFormattedString method.

Code:

    import android.text.Editable;
    import android.text.TextWatcher;
    import android.widget.EditText;

    import java.text.DecimalFormat;


    /**
     * Created by srv_twry on 4/12/17.
     * Source: https://stackoverflow.com/a/34265406/137744
     * The custom TextWatcher that automatically adds thousand separators in EditText.
     */

    public class ThousandSeparatorTextWatcher implements TextWatcher {

        private DecimalFormat df;
        private EditText editText;
        private static String thousandSeparator;
        private static String decimalMarker;
        private int cursorPosition;

        public ThousandSeparatorTextWatcher(EditText editText) {
            this.editText = editText;
            df = new DecimalFormat("#,###.##");
            df.setDecimalSeparatorAlwaysShown(true);
            thousandSeparator = Character.toString(df.getDecimalFormatSymbols().getGroupingSeparator());
            decimalMarker = Character.toString(df.getDecimalFormatSymbols().getDecimalSeparator());
        }

        @Override
        public void beforeTextChanged(CharSequence charSequence, int start, int count, int after) {
            cursorPosition = editText.getText().toString().length() - editText.getSelectionStart();
        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {}

        @Override
        public void afterTextChanged(Editable s) {
            try {
                editText.removeTextChangedListener(this);
                String value = editText.getText().toString();

                if (value != null && !value.equals("")) {
                    if (value.startsWith(decimalMarker)) {
                        String text = "0" + decimalMarker;
                        editText.setText(text);
                    }
                    if (value.startsWith("0") && !value.startsWith("0" + decimalMarker)) {
                        int index = 0;
                        while (index < value.length() && value.charAt(index) == '0') {
                            index++;
                        }
                        String newValue = Character.toString(value.charAt(0));
                        if (index != 0) {
                            newValue = value.charAt(0) + value.substring(index);
                        }
                        editText.setText(newValue);
                    }
                    String str = editText.getText().toString().replaceAll(thousandSeparator, "");
                    if (!value.equals("")) {
                        editText.setText(getDecimalFormattedString(str));
                    }
                    editText.setSelection(editText.getText().toString().length());
                }

                //setting the cursor back to where it was
                editText.setSelection(editText.getText().toString().length() - cursorPosition);
                editText.addTextChangedListener(this);
            } catch (Exception ex) {
                ex.printStackTrace();
                editText.addTextChangedListener(this);
            }
        }

        private static String getDecimalFormattedString(String value) {

            String[] splitValue = value.split("\\.");
            String beforeDecimal = value;
            String afterDecimal = null;
            String finalResult = "";

            if (splitValue.length == 2) {
                beforeDecimal = splitValue[0];
                afterDecimal = splitValue[1];
            }

            int count = 0;
            for (int i = beforeDecimal.length() - 1; i >= 0 ; i--) {
                finalResult = beforeDecimal.charAt(i) + finalResult;
                count++;
                if (count == 3 && i > 0) {
                    finalResult = thousandSeparator + finalResult;
                    count = 0;
                }
            }

            if (afterDecimal != null) {
                finalResult = finalResult + decimalMarker + afterDecimal;
            }

            return finalResult;
        }

        /*
        * Returns the string after removing all the thousands separators.
        * */
        public static String getOriginalString(String string) {
            return string.replace(thousandSeparator,"");
        }
    }

Answer 2

Here i have tested my application code. text-watcher how to add comma in currency thousand, lake currency.

 private TextWatcher textWatcherAmount = 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) {
            String initial = s.toString();

            if (inputEdtHawalaRate == null) return;

            if (!TextUtils.isEmpty(initial)) {

                initial = initial.replace(",", "");

                NumberFormat formatter = new DecimalFormat("##,##,###");

                inputEdtHawalaRate.removeTextChangedListener(this);

                double myNumber = Double.parseDouble(initial);
                String processed = formatter.format(myNumber);

                //Assign processed text
                inputEdtHawalaRate.setText(processed);

                try {
                    inputEdtHawalaRate.setSelection(processed.length());
                } catch (Exception e) {
                    e.printStackTrace();
                }

                //Give back the listener
                inputEdtHawalaRate.addTextChangedListener(this);

            }

        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    };


 if (inputEdtHawalaRate != null) {
            inputEdtHawalaRate.addTextChangedListener(textWatcherAmount);
        } 

// getting amount on double type varaible (On textwatcher editetxt value get).

String amount = Objects.requireNonNull(inputEdtHawalaRate.getText()).toString().trim();
double hawalaAmount = 0.0;

 String[] a = amount.split(",");
            finalAmount = TextUtils.join("", a);
            hawalaAmount = Double.parseDouble(finalAmount);

Answer 3

  public static String doubleToStringNoDecimal(double d) {
        DecimalFormat formatter = (DecimalFormat) NumberFormat.getInstance(Locale.US);;
        formatter .applyPattern("#,###");
        return formatter.format(d);
    }

Answer 4

You can use this method:

myEditText.addTextChangedListener(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) {

                    String input = s.toString();

                    if (!input.isEmpty()) {

                        input = input.replace(",", "");

                        DecimalFormat format = new DecimalFormat("#,###,###");
                        String newPrice = format.format(Double.parseDouble(input));


                        myEditText.removeTextChangedListener(this); //To Prevent from Infinite Loop

                        myEditText.setText(newPrice);
                        myEditText.setSelection(newPrice.length()); //Move Cursor to end of String

                        myEditText.addTextChangedListener(this);
                    }

                }

                @Override
                public void afterTextChanged(final Editable s) {
                }
            });

And to get original text use this:

String input = myEditText.getText().toString();
input = input.replace(",", "");

Answer 5

you can use this code in many ways in your program, you give it a string and it separate each three from right and place space there.

private String Spacer(String number){
    StringBuilder strB = new StringBuilder();
    strB.append(number);
    int Three = 0;

    for(int i=number.length();i>0;i--){
        Three++;
        if(Three == 3){
            strB.insert(i-1, " ");
            Three = 0;
        }
    }
    return strB.toString();
}// end Spacer()

u can change it a bit and use it ontextchangelistener. good luck

Answer 6

This solution has some advantage over other answers. For example, it keeps the user's cursor position even if they edit the beginning or middle of the number. Other solutions always jump the cursor to the end of the number. It handles decimals and whole numbers, as well as locales that use characters other than . for the decimal separator and , for the thousands grouping separator.

class SeparateThousands(val groupingSeparator: String, val decimalSeparator: String) : TextWatcher {

    private var busy = false

    override fun afterTextChanged(s: Editable?) {
        if (s != null && !busy) {
            busy = true

            var place = 0

            val decimalPointIndex = s.indexOf(decimalSeparator)
            var i = if (decimalPointIndex == -1) {
                s.length - 1
            } else {
                decimalPointIndex - 1
            }
            while (i >= 0) {
                val c = s[i]
                if (c == groupingSeparator[0] ) {
                    s.delete(i, i + 1)
                } else {
                    if (place % 3 == 0 && place != 0) {
                        // insert a comma to the left of every 3rd digit (counting from right to
                        // left) unless it's the leftmost digit
                        s.insert(i + 1, groupingSeparator)
                    }
                    place++
                }
                i--
            }

            busy = false
        }
    }

    override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
    }

    override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
    }
}

Then in xml:

  <EditText
    android:id="@+id/myNumberField"
    android:digits=",.0123456789"
    android:inputType="numberDecimal"
    .../>

And finally register the watcher:

findViewById(R.id.myNumberField).addTextChangedListener(
    SeparateThousands(groupingSeparator, decimalSeparator))

To handle . vs , in different locales use groupingSeparator and decimalSeparator, which can come from DecimalFormatSymbols or localized strings.