Automatic user address search

Question

Any automatic search method for the address from the current location of the user? No need to fill in the address fields. Informing the zip code or clicking a search button.

Answer 1

Take a look at the class Geocoder and its method getFromLocation.

Has a complete example on the site for Android developers, but, in short, it’s something like:

Geocoder geocoder = new Geocoder(this, Locale.getDefault());
List<Address> addresses = null;

try {
    addresses = geocoder.getFromLocation(latitude, longitude, 1);
} catch (IOException ioException) {
    Log.e(TAG, "Serviço indisponível", ioException);
} catch (IllegalArgumentException illegalArgumentException) {
    Log.e(TAG, "Localização inválida", illegalArgumentException);
}

if(addresses != null && addresses.size() > 0) {
    Address address = addresses.get(0);
    // Esse é o endereço.
}

For more details, and a full functional example, I recommend reading of the guide

Answer 2

Well, I’ll split my answer into two parts:

• Perform the search when the user enters the zip code in the form field:

cep.setOnFocusChangeListener(OnFocusChangeListener { _, hasFocus -> if (!hasFocus) { if(Utils.validCep(cep.text.toString())){ //Request para o serviço de consulta do CEP } } })

where: the zip code is mine EditText. I used the method OnFocusChangeListener in this case because the way I set up my form, was the most suitable in my vision. But you can control via IMEOptions or TextChangedListener, however you prefer.

I will also leave the function that validates the zip code below.

fun validCep(cep: String): Boolean {
        val pattern = Pattern.compile("^[0-9]{5}-[0-9]{3}$")
        val matcher = pattern.matcher(cep)
        return matcher.find()
    }

• Fetch data from the entered zip code

I like to use the Viacep to do this.

Just send a request to the address viacep.com.br/ws/01001000/json/, where 01001000 would be the zip code to consult, and it returns you a JSON in this format:

 {
  "cep": "01001-000",
  "logradouro": "Praça da Sé",
  "complemento": "lado ímpar",
  "bairro": "Sé",
  "localidade": "São Paulo",
  "uf": "SP",
  "unidade": "",
  "ibge": "3550308",
  "gia": "1004"
}

Just you take the return and set to the address fields pro your form in case of return 200.

If you do not have a form to enter the zip code, the best way is to follow the answer using Geocoder, where you would get the location of the device for consultation.