Currency input with 2 decimal format

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));
}

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;
        }
    }
}

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.