android how to make edittext input can't be started with zero(0)

Question

how to make edittext input can't be started with zero? example: 01000 or 0987654321 so on , or we input some value first , example 98124723475 then we add zero(0) in front 098124723475. i am making an app to calculate some prices this bugged me. Suppose the user found this, the edittext is able to input "0" that's bad.

Related, possibly duplicate: http://stackoverflow.com/q/3349121/102937 — Robert Harvey, Feb 26 '15 at 05:12
i don't think its related to this, that one talking about characters limitation. Are you implying to tell me to use intent filter? — george samuel, Feb 26 '15 at 08:07

score 5 · Accepted Answer · answered Feb 26 '15 at 06:10

Implement addTextChangedListener for editText and check the entered text start with zero or not, like:

editText.addTextChangedListener(new TextWatcher() {
        @Override
        public void onTextChanged(CharSequence s, int start, int before,
                int count) {
                String enteredString = s.toString();
                if (enteredString.startsWith("0")) {
                    Toast.makeText(Activity.this,
                            "should not starts with zero(0)",
                            Toast.LENGTH_SHORT).show();
                    if (enteredString.length() > 0) {
                        editText.setText(enteredString.substring(1));
                    } else {
                        editText.setText("");
                    }
                }
            }

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

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

score 3 · Answer 2 · answered Feb 26 '15 at 06:35

You can do this through check that entry start woth 0 or not using this.

edittext.getText().toString().startsWith("0");

using this if condition is true than display Toast msg or execute what u want.

And you can also use TextWatcher with Edittext. using this u can check every time that user entered 0 or not.

score 2 · Answer 3 · answered Feb 26 '15 at 05:23

2

listen for the Key Stroke event for the EditText and check the keypressed to 0. or

    *yourEditText.getText().toString().startsWith("0");*

This might work on button click

answered Feb 26 '15 at 05:23

Vishnu T B

118
3
15

score 2 · Answer 4 · answered Feb 26 '15 at 06:13

Just do this dude..

editText.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) {
            if (editText.getText().toString().startsWith("0"))
                editText.setText(editText.getText().toString().substring(1));
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    });

score 1 · Answer 5 · answered Jun 11 '18 at 09:09

I have the some problem. Fix with this

et.addTextChangedListener(new TextWatcher() {
        @Override
        //...

        @Override
        public void afterTextChanged(Editable s) {
            String text = s.toString();
            int len = s.toString().length();
            if (len > 1 && text.startsWith("0")) {
                s.replace(0,1,"");
            }
        }
    });

android how to make edittext input can't be started with zero(0)

5 Answers5