Android Money Input with fixed decimal

Question

How do you create an edittext entry that formats input in money format only? When the user enters 5, I want the input to look like "$0.05" and when they then enter 3, the input should now look like "$0.53" and finally they enter 6 and the input should look like "$5.36".

Answer 1

ninjasense's complete solution basically works, but it has some issues:

1. Every time the data of the field is altered in the "onTextChanged" handler, cursor position resets to index 0 on the field, which is a bit annoying to happen when typing in monetary values.
2. It uses floats for formatting monetary values, which can backfire.

For the first problem I don't have solution yet, for the second one code like this works:

    @Override
    public void onTextChanged(CharSequence s, int start,
            int before, int count) {
        if(!s.toString().matches("^\\$(\\d{1,3}(\\,\\d{3})*|(\\d+))(\\.\\d{2})?$"))
        {
            String userInput= ""+s.toString().replaceAll("[^\\d]", "");
            StringBuilder cashAmountBuilder = new StringBuilder(userInput);

            while (cashAmountBuilder.length() > 3 && cashAmountBuilder.charAt(0) == '0') {
                cashAmountBuilder.deleteCharAt(0);
            }
            while (cashAmountBuilder.length() < 3) {
                cashAmountBuilder.insert(0, '0');
            }
            cashAmountBuilder.insert(cashAmountBuilder.length()-2, '.');
            cashAmountBuilder.insert(0, '$');

            cashAmountEdit.setText(cashAmountBuilder.toString());
        }

    }

Answer 2

Building off Zds.

For keeping the cursor positioned at the end of the field use this.

cashAmountEdit.setTextKeepState(cashAmountBuilder.toString());
Selection.setSelection(cashAmountEdit.getText(), cashAmountBuilder.toString().length());

Answer 3

You can use a TextWatcher to do that kind of thing.

Extend TextWatcher: http://d.android.com/reference/android/text/TextWatcher.html

public class MyTextWatcher implements TextWatcher {

    public void afterTextChanged(Editable arg0) { 

    }

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

    }

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

    }

}

Then add it to your editText with

myEditText.addTextChangedListener(new MyTextWatcher());

Answer 4

I found the TextWatcher to be a bit cumbersome. Instead, you can set the key listener:

setKeyListener(new CalculatorKeyListener());
// Must be called after setKeyListener(), otherwise is overridden
setRawInputType(Configuration.KEYBOARD_12KEY);

And then create a KeyListener which extends NumberKeyListener:

class CalculatorKeyListener extends NumberKeyListener {
    @Override
    public int getInputType() {
        return InputType.TYPE_CLASS_NUMBER;
    }

    @Override
    public boolean onKeyDown(View view, Editable content, int keyCode, KeyEvent event) {
        if (keyCode >= KeyEvent.KEYCODE_0 && keyCode <= KeyEvent.KEYCODE_9) {
            digitPressed(keyCode - KeyEvent.KEYCODE_0);
        } else if (keyCode == KeyEvent.KEYCODE_DEL) {                                         
            deletePressed();
        }
        return true;
    }

    @Override
    protected char[] getAcceptedChars() {
        return new char[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
    }
}

You then need to display the characters correctly, but that's not difficult; just keep track of cents, and then divide or multiply by 10, and use a NumberFormat to get the formatting correct.

Answer 5

Heres my complete solution:

                tvValue.setRawInputType(Configuration.KEYBOARD_12KEY);

            tvValue.addTextChangedListener(new TextWatcher(){


                @Override
                public void afterTextChanged(Editable arg0) {
                    // TODO Auto-generated method stub

                }

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

                }

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

                    // here i converted to string
                    if(!s.toString().matches("^\\$(\\d{1,3}(\\,\\d{3})*|(\\d+))(\\.\\d{2})?$"))
                    {
                        String userInput= ""+s.toString().replaceAll("[^\\d]", "");
                        Float in=Float.parseFloat(userInput);
                        float percen = in/100;
                        tvValue.setText("$"+percen);
                    }

                }

            });