How to disable entering numbers after zero in edittext?

Question

How to disable numbers entering after zero in edittext?

I have validated only for this..

 if (TextUtils.isEmpty(strBalance)) {
                    Toast.makeText(TransactionSellINActivity.this, "Amount should not be empty", Toast.LENGTH_SHORT)
                            .show();
                } else if (strBalance.equalsIgnoreCase("0")) {
                    Toast.makeText(TransactionSellINActivity.this, "Amount should not be Zero", Toast.LENGTH_SHORT)
                            .show();
                }

But if user enters 01 or 001 or 02,03 etc.,? ie number after zero? -> I want to restrict those numbers

How to handle such case?

you want 01 or 02 or you dont want 01 or 02 be clear..

Santanu Sur
– Santanu Sur

2018-02-07 07:15:31 +00:00
Commented Feb 7, 2018 at 7:15 — Santanu Sur
– Santanu Sur, Commented Feb 7, 2018 at 7:15
I don't want to use

Walter
– Walter

2018-02-07 07:16:20 +00:00
Commented Feb 7, 2018 at 7:16 — Walter
– Walter, Commented Feb 7, 2018 at 7:16
have you tried using methods like startsWith and length

Scary Wombat
– Scary Wombat

2018-02-07 07:16:51 +00:00
Commented Feb 7, 2018 at 7:16 — Scary Wombat
– Scary Wombat, Commented Feb 7, 2018 at 7:16
i have updated the answer.

Santanu Sur
– Santanu Sur

2018-02-07 07:17:47 +00:00
Commented Feb 7, 2018 at 7:17 — Santanu Sur
– Santanu Sur, Commented Feb 7, 2018 at 7:17
see this answer stackoverflow.com/questions/2800739/…

Bishoy Kamel
– Bishoy Kamel

2018-02-07 07:32:18 +00:00
Commented Feb 7, 2018 at 7:32 — Bishoy Kamel
– Bishoy Kamel, Commented Feb 7, 2018 at 7:32

Manish Singh · Accepted Answer · 2018-02-07 07:36:05Z

1

if (TextUtils.isEmpty(strBalance)) {
                Toast.makeText(TransactionSellINActivity.this, "Amount should not be empty", Toast.LENGTH_SHORT)
                        .show();
            } else if (strBalance.equalsIgnoreCase("0")) {
                Toast.makeText(TransactionSellINActivity.this, "Amount should not be Zero", Toast.LENGTH_SHORT)
                        .show();
            }
            else if(strBalance.indexOf("0")!=a.length()-1)
                {
                Toast.makeText(TransactionSellINActivity.this, "Amount Not Valid", Toast.LENGTH_SHORT)
                        .show();
                }
                else{
                    Toast.makeText(TransactionSellINActivity.this, "Amount  Valid", Toast.LENGTH_SHORT)
                        .show();
                }

answered Feb 7, 2018 at 7:36

Manish Singh

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2 Comments

Manish Singh Over a year ago

This will not ptint number after 0.

Walter Over a year ago

Yes. Thank you so much.

Rob · Accepted Answer · 2018-02-07 07:29:07Z

1

I think you want to restrict those numbers that are starting with 0. For this you have to use .startsWith()

if (TextUtils.isEmpty(strBalance)) {
                Toast.makeText(TransactionSellINActivity.this, "Amount should not be empty", Toast.LENGTH_SHORT)
                        .show();
            } else if (strBalance.startsWith("0")) {
                Toast.makeText(TransactionSellINActivity.this, "Amount should not be Zero", Toast.LENGTH_SHORT)
                        .show();
            }

answered Feb 7, 2018 at 7:29

Rob

335 bronze badges

Comments

Sahdev Rajput · Accepted Answer · 2018-02-07 07:32:14Z

User can't add numbers after zero using this code TRY IT

Edittext.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence arg0, int arg1, int arg2,
                int arg3) {

        }

        @Override
        public void beforeTextChanged(CharSequence arg0, int arg1,
                int arg2, int arg3) {

        }

        @Override
        public void afterTextChanged(Editable arg0) {

            if (Edittext.getText().toString().startsWith("0")
                    && Edittext.getText().length() > 1) {

                Edittext.setText("0");
                Edittext.setSelection(Edittext.getText().toString().length());
            }
        }
    });

May be useful to you!!

Zaid Mirza · Accepted Answer · 2018-02-07 07:27:39Z

0

You can do this too, let user enter zeros as many as he want. Following regex will remove leading zeros from string after then you can proceed with your string.

if (!TextUtils.isEmpty(strBalance) && Integer.parseInt(strBalance) > 0) 
{
        strBalance=strBalance.replaceFirst("^0+(?!$)", "")       
}

answered Feb 7, 2018 at 7:27

Zaid Mirza

3,7392 gold badges27 silver badges42 bronze badges

Comments

sanemars · Accepted Answer · 2018-02-07 07:34:48Z

0

private EditText  mEt;//your edittext
private TextWatcher mMoneyWatcher = 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) {

        if (!s.toString.isEmpty()) {
            mPayEtValue.removeTextChangedListener(mMoneyWatcher);
            if (s.toString.charAt(0)=='0') {
              mEt.setText(s.toString.substring(1,s.length()));  
            }

            mEt.addTextChangedListener(mMoneyWatcher);
        }
    }

    @Override
    public void afterTextChanged(Editable s) {

    }
};
mEt.addTextChangedListener(mMoneyWatcher);

edited Feb 7, 2018 at 7:34

answered Feb 7, 2018 at 7:22

sanemars

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2 Comments

Walter Over a year ago

what is mPayEtValue?

sanemars Over a year ago

@Walter sorry my mistake

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