Currency input with 2 decimal format

问题:

I need to format input currency with 2 decimal format example when user enter 2 it looks $2.00 then when when user enter 2 it convert to $22.00 ... etc

I approach to something similar , when user enter 2 it convert to $0.02 next 2 will be like this $0.22

any one can help me thank you

public class MoneyTextWatcher implements TextWatcher {
    private final WeakReference<EditText> editTextWeakReference;

    public MoneyTextWatcher(EditText mEditText) {
        editTextWeakReference = new WeakReference<EditText>(mEditText);
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {

       EditText editTex = editTextWeakReference.get();
        if(!s.toString().equals(editTex.getText())) {
            editTex.removeTextChangedListener(this);
            String cleanString = s.toString().replaceAll("[$,.]", "");
            double parsed = Double.parseDouble(cleanString.replaceAll("[^\\d]", ""));
            String formatted = NumberFormat.getCurrencyInstance().format((parsed / 100));
            editTex.setText(formatted);
            editTex.setSelection(formatted.length());

            editTex.addTextChangedListener(this);

    }

    @Override
    public void afterTextChanged(Editable s) {

    }


    }
}

回答1:

I think you can try the following:

Layout:

<EditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="numberDecimal"
        />

Activity:

EditText editText = (EditText) findViewById(R.id.editText);
editText.addTextChangedListener(new NumberTextWatcher(editText, "#,###"));

with text watcher as the following:

public class NumberTextWatcher implements TextWatcher {

    private final DecimalFormat df;
    private final DecimalFormat dfnd;
    private final EditText et;
    private boolean hasFractionalPart;
    private int trailingZeroCount;

    public NumberTextWatcher(EditText editText, String pattern) {
        df = new DecimalFormat(pattern);
        df.setDecimalSeparatorAlwaysShown(true);
        dfnd = new DecimalFormat("#,###.00");
        this.et = editText;
        hasFractionalPart = false;
    }

    @Override
    public void afterTextChanged(Editable s) {
        et.removeTextChangedListener(this);

        if (s != null && !s.toString().isEmpty()) {
            try {
                int inilen, endlen;
                inilen = et.getText().length();
                String v = s.toString().replace(String.valueOf(df.getDecimalFormatSymbols().getGroupingSeparator()), "").replace("$","");
                Number n = df.parse(v);
                int cp = et.getSelectionStart();
                if (hasFractionalPart) {
                    StringBuilder trailingZeros = new StringBuilder();
                    while (trailingZeroCount-- > 0)
                        trailingZeros.append('0');
                    et.setText(df.format(n) + trailingZeros.toString());
                } else {
                    et.setText(dfnd.format(n));
                }
                et.setText("$".concat(et.getText().toString()));
                endlen = et.getText().length();
                int sel = (cp + (endlen - inilen));
                if (sel > 0 && sel < et.getText().length()) {
                    et.setSelection(sel);
                } else if (trailingZeroCount > -1) {
                    et.setSelection(et.getText().length() - 3);
                } else {
                    et.setSelection(et.getText().length());
                }
            } catch (NumberFormatException | ParseException e) {
                e.printStackTrace();
            }
        }

        et.addTextChangedListener(this);
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        int index = s.toString().indexOf(String.valueOf(df.getDecimalFormatSymbols().getDecimalSeparator()));
        trailingZeroCount = 0;
        if (index > -1) {
            for (index++; index < s.length(); index++) {
                if (s.charAt(index) == '0')
                    trailingZeroCount++;
                else {
                    trailingZeroCount = 0;
                }
            }
            hasFractionalPart = true;
        } else {
            hasFractionalPart = false;
        }
    }
}

回答2:

Keep the number entered by the user stored apart, since if you use your edittext.text you will have more problems.

Then use DecimalFormat to format it like you need.

For the first, maybe its a good way to restore the original input to the edittext as soon as the users begins editing, this way you can avoid problems with the editing.

Hope this helps.

回答3:

HI below code will convert every number to two decimal. the value should be number, characters and special characters can cause numberformat exception. please handle that as you needed. Thanks

    public static String formatDecimal(String value) {
    DecimalFormat df = new DecimalFormat("#,###,##0.00");
    return df.format(Double.valueOf(value));
}