How to do zip validation for Android

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I would like to know how I validate a cep typed by the user in an Edittext on Android. Do I need a specific API? I want to validate if the zip code is existing and return to the screen if it is not.

java android api mobile zip-code

2 answers

1


If you have the formula to validate the ZIP code on hand, you can do this in the class.

Capture her text using

TextView textoCEP = (TextView) rootView.findViewById(R.id.<suaEditText>);

So put in a String that text capturing you with a <sua editText>.getText(); You may need to use .toString(); because they usually return CharSequences.

If it’s not that, it’s something along those lines. I hope I can help you.

EDIT: So, Validate Zip Codes is kind of tricky. You can check if the zip code has the right number of digits, which are 8, and format it using a substring (Viewed on internet/untested):

        if (cep.Length == 8) {
            cep = cep.Substring(0, 5) + "-" + cep.Substring(5, 3);
        }

However, the final three digits indicate the state from which that zip code comes. Since it would be very big to paste all the numbers here, follow something similar in a forum I saw on Google. It’s not in Java, but you should be able to get the idea: http://www.devmedia.com.br/dicas-validando-cep/833

  • Cast a EditText for a TextView works because both use texts.

  • What I don’t have is just the validation code. I wondered if it was by post office api or something.

  • @Felipemiranda, I edited my answer. I hope it’s what you’re looking for.

  • Thank you! That’s what I’m looking for, but I want to see if it’s an existing zip code as well. I’ll analyze the link you sent me.

  • @Felipemiranda, if my answer helped, mark it later. But, if the answer was something other than what I said and you found, answer your own question, so other Sopt users can be sure! Hug.

  • Dude, I can’t use the substring method. Remembering that I’m picking up the zip code of an Edittext that the user informs.

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0

You can use this class available on Github as an example project.

String zipcode = editText.getText().toString();
    Pattern pattern_zipcode = Pattern.compile("(^\\d{5}-\\d{3}|^\\d{2}.\\d{3}-\\d{3}|\\d{8})");
    Matcher matcher = pattern_zipcode.matcher(zipcode);
    if(zipcode.equals("")){
        editText.setError("O campo não pode estar vazio");
        editText.requestFocus();
        // Faça aqui sua ação caso o campo esteja vazio.
    }
    if (!matcher.matches()) {
        editText.setError("Informe um CEP válido");
        editText.requestFocus();
        // Faça aqui sua ação caso seja o CEP invalido.
    } else {
        // Caso esteja tudo OK realize a ação aqui.
    }

Using the REGEX that is in Pattern, if you want other formats you can search for them on this site here.

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