Android Locked When Calling API

Question

I have this method in the main:

private String token () throws IOException {

    String login = this.login.getText().toString();
    String senha = this.senha.getText().toString();

    Login dados = new Login(login, senha);

    HttpService HttpService = new HttpService("https://www.acweb.net.br/api/orcamentos/login");

    String retorno = HttpService.execute(dados).toString();

    return retorno;

}

That calls a class Httpservice extending Asynctask next:

package br.net.concertacell.classes;

import android.os.AsyncTask;

import com.google.gson.Gson;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Scanner;

public class HttpService extends AsyncTask<Login, Integer, String> {

    private String url;

    public HttpService (String _url) {

        this.url        =  _url;

    }

    @Override
    protected String doInBackground(Login... parametros) {

        StringBuilder resposta = new StringBuilder();

        try {

            URL url = new URL(this.url);

            HttpURLConnection connection = (HttpURLConnection) url.openConnection();

            String json = new Gson().toJson(parametros);
            System.out.println("retorno: " + json);
            connection.setRequestMethod("POST");
            connection.getOutputStream().write(json.getBytes("UTF-8"));
            connection.setRequestProperty("Content-type", "application/json");
            connection.setRequestProperty("Accept", "application/json");
            connection.setDoOutput(true);
            connection.setConnectTimeout(5000);
            connection.connect();

            Scanner scanner = new Scanner(url.openStream());
            while (scanner.hasNext()) {
                resposta.append(scanner.next());
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }


        return resposta.toString();
    }

}

The problem:

Linebound System.out.println("return: " + json);, I have the following answer:

I/System.out: retorno: [{"id":0,"login":"Teste","senha":"Testando"}]

That is, a json, which is what the API waiting.

But when it passes to the lines below:

connection.setRequestMethod("POST");
connection.getOutputStream().write(json.getBytes("UTF-8"));
connection.setRequestProperty("Content-type", "application/json");
connection.setRequestProperty("Accept", "application/json");
connection.setDoOutput(true);
connection.setConnectTimeout(5000);
connection.connect();

then the system crashes.

There’s something wrong with that code?

I tried it the way below and it also gives the same error:

public String post(String json) throws IOException {

        URL url = new URL("https://www.acweb.net.br/api/orcamentos/login");

        HttpURLConnection connection = (HttpURLConnection) url.openConnection();

        connection.setRequestMethod("POST");

        connection.setRequestProperty("Content-type", "application/json");

        connection.setRequestProperty("Accept", "application/json");

        connection.setDoOutput(true);

        PrintStream printStream = new PrintStream(connection.getOutputStream());

        printStream.println(json);

        connection.connect();

        String jsonDeResposta = new Scanner(connection.getInputStream()).next();

        return jsonDeResposta;

    }

    @Override
    protected String doInBackground(Login... parametros) {

        StringBuilder resposta = new StringBuilder();
        String json = new Gson().toJson(parametros);
        try {
            this.post(json);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return resposta.toString();
    }

It seems to me that’s the way to send the JSON:

[{"id":0,"login":"Teste","senha":"Testando"}]

But I’m not sure!

Answer 1

I believe the problem lies in these lines:

connection.setRequestProperty("Content-type", "application/json");
connection.setRequestProperty("Accept", "application/json");

You call the same method twice, with different values.