[Android Studio] MainActivity does not exist


MainActivity does not exist or Error running 'app': Default Activity not found is an error you might get if you have either deleted or renamed the MainActivity.java file without refactoring the code.

If you do not find the file under app -> java directory then create a new one,

package YOUR-PACKAGE;

import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

import android.view.View;

import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

✌️ Few thing you can try is checking undo list to see if the file was recently deleted to recover it, or if are using version control in your project you can recover it easily.






Hello there!,

You are using AdBlocker!

I am an independent developer trying to help fellow developers and students to resolve issues faced on a day-to-day basis, we 'Code to Care' . There is a lot of expenses involved in hosting and managing a website that's the reason we have ads.

A humble request to you to disable adBlocker on Code2care.org and support us pay our bills.

Thanks,
Cod2care - Line's of code for change.

To see contents reload page after unblocking
Code2care is an initiative to publish and share varied knowledge in programming and technical areas gathered during day-to-day learnings and development activities. Students and Software Developers can leverage this portal to find solutions to their various queries without re-inventing the wheel by referring to our easy to understand posts. Technical posts might include Learnings, Video Tutorials, Code Snippets, Tips-n-tricks, How Tos, Blogs, Articles, etc. on various platforms like Windows, Mac, Linux, Mobile platforms, etc. Technologies/Languages like Java, Objective-C, PHP, .Net, Android, SharePoint, jQuery, HTML, CSS, etc.