Como corrigir o Android Os.NetworkOnMainThreadException?

Usando AsyncTask (recomendado)

importar androidx.appcompat.app.AppCompatActivity; importar android.os.AsyncTask; importar android.os.Bundle; importar android.widget.TextView; importar java.io.BufferedReader; importar java.io.IOException; importar java.io.InputStreamReader; importar java.net.URL; public class MainActivity extends AppCompatActivity { TextView textLoad, textMessage; final String strMessage = “https://sites.google.com/site/androidersite/text.txt”; @Override void protegido onCreate(Pacote salvadoInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textLoad = findViewById(R.id.textLoad); textMessage = findViewById(R.id.textMessage); textLoad.setText("Carregando..."); new MinhaTask().execute(); } private class MyTask extends AsyncTask{ String result; @Override protected Void doInBackground(Void… voids) { URL url; tente { url = nova URL(strMessage); BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(url.openStream())); String stringBuffer; String string = “”; while ((stringBuffer = bufferedReader.readLine()) != null){ string = String.format(“%s%s”, string, stringBuffer); } bufferedReader.close(); resultado = string; } catch (IOException e){ e.printStackTrace(); resultado = e.toString(); } retornar nulo; } @Override protected void onPostExecute(Void aVoid) { textMessage.setText(result); textLoad.setText(“Concluído”); super.onPostExecute(aVoid); } } }

Desativar Modo Estrito (Não recomendado)

if (andróide.os.Build.VERSION.SDK_INT > 9) { StrictMode.ThreadPolicy Privacidade = new StrictMode.ThreadPolicy.Builder().permitAll().build(); StrictMode.setThreadPolicy(Privacidade); }

Última atualização: 11 de junho de 2023