Software

How to fix android Os.NetworkOnMainThreadException?

By using AsyncTask (recommended)

import androidx.appcompat.app.AppCompatActivity; import android.os.AsyncTask; import android.os.Bundle; import android.widget.TextView; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.URL; public class MainActivity extends AppCompatActivity { TextView textLoad, textMessage; final String strMessage = “https://sites.google.com/site/androidersite/text.txt”; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textLoad = findViewById(R.id.textLoad); textMessage = findViewById(R.id.textMessage); textLoad.setText(“Loading…”); new MyTask().execute(); } private class MyTask extends AsyncTask{ String result; @Override protected Void doInBackground(Void… voids) { URL url; try { url = new 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(); result = string; } catch (IOException e){ e.printStackTrace(); result = e.toString(); } return null; } @Override protected void onPostExecute(Void aVoid) { textMessage.setText(result); textLoad.setText(“Finished”); super.onPostExecute(aVoid); } } }

Disable Strict Mode (Not recommended)

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

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23 Comments

    1. Seems like a comical contradiction to recommend something while also stating it’s not recommended.

  1. Disabling Strict Mode is not recommended due to potential security and performance issues.

    1. Agreed, it’s important to prioritize security and performance in Android development.

  2. While AsyncTask may be recommended, it’s important to consider the potential memory leaks it can cause.

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Chara Yadav

Chara Yadav holds MBA in Finance. Her goal is to simplify finance-related topics. She has worked in finance for about 25 years. She has held multiple finance and banking classes for business schools and communities. Read more at her bio page.