Android studio cannot resolve symbol R when creating a new project

Question

I have been trying to create a new project in android studio and I get R. in red saying cannot resolve symbol R. I already installed android-sdk and linked it with android studio. I added android support v4.0 to lib folder. But still a new project gives the above error. Tried synchronizing with gradle, cleaning, rebuilding and invalidate cache and restart. They don't work.

package com.example.root.mn;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;

public class Mn extends AppCompatActivity {

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

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_mn, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

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

        return super.onOptionsItemSelected(item);
    }
}

Above is the main activity of the project. I'm using android studio in linux. I've installed all APIs in sdk. Updated them.

This can happen because you have some errors in your code, if no error is there try to comment your extra code and run the normal Blank/Empty activity — Rakshit Nawani, Apr 06 '16 at 07:34
most the time it is a problem in any xml layout or values file. — Opiatefuchs, Apr 06 '16 at 07:36
I did not add or edit any code. I just created the project, ried to build it. — , Apr 06 '16 at 07:39
Then comment you java file code and comment your activity_mn and show only an empty text view like the first time you create your blank activity and then try to run your code — Rakshit Nawani, Apr 06 '16 at 07:42
Tried that. But the import itself says cannot resolve symbol R — , Apr 06 '16 at 07:51

score 0 · Answer 1 · answered Apr 06 '16 at 07:44

0

I cannot comment hence posting here.. click on that R and click alt+Enter then click import class. the R file import may look like (in your case) import com.example.root.R

answered Apr 06 '16 at 07:44

Lol

93
10

Tried that already. But they don't give an option to import class, when I hit alt+enter. – Apr 06 '16 at 07:48
try typing it. import com.example.root.R – Lol Apr 06 '16 at 07:53
Did that already. But the import itself says cannot resolve symbol R – Apr 06 '16 at 07:54

Android studio cannot resolve symbol R when creating a new project

1 Answers1