Android emulator accesses web service by browser but not by APP

Question

Good morning, what happens is the following my emulator accesses my web service by browser at http://192.168. 2.192/index.php, it shows the result of the page,

<?php
	$minha_info = "TESTE JSON";
   	echo json_encode($minha_info);
?>

as far as I understood it is to work because, on the page has an information, this is my code in android studio

public class MainActivity extends AppCompatActivity {


    private Button button;
    private TextView textView;
    private TextInputEditText cep;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = findViewById(R.id.button);
        textView = findViewById(R.id.textView);
        cep = findViewById(R.id.cep);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                MyTask task = new MyTask();
                String numero = cep.getText().toString();
                String urlApi = "http://192.168.2.192/teste.php";
                task.execute(urlApi);

            }
        });

    }
    class MyTask extends AsyncTask<String, Void, String>{

        @Override
        protected String doInBackground(String... strings) {
            String stringurl = strings[0];
            InputStream inputStream = null;
            InputStreamReader inputStreamReader = null;
            StringBuffer  buffer = null;
            try {
                URL url = new URL(stringurl);
                HttpURLConnection conexao = (HttpURLConnection) url.openConnection();
                inputStream = conexao.getInputStream();
                inputStreamReader = new InputStreamReader(inputStream);
                BufferedReader reader = new BufferedReader(inputStreamReader);
                buffer = new StringBuffer();
                String linha = "";
                while ((linha = reader.readLine()) != null){
                    buffer.append(linha);
                }


            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return buffer.toString();
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            textView.setText(s);
        }
    }
}

however, it simply crashes, and when I test with external web services it works, but only with my local web service it doesn’t work.

@EDIT Problem solved by adding networkacess

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

the application was without permission to access the local network

Answer 1

First you need to add permissions to your Androidmanifest

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

After this setting, use ip: 10.0.2.2 in order to be able to access your localhost. Documentation: here

Don’t forget to use the http protocol in the call: http://10.0.2.2/recurso