"R cannot be resolved to a variable" just after creating android project?

Question

Just after creating the new Android Application Project I get the error "R cannot be resolved to a variable" in my MainActivity.java file.

This is it's content:

package com.example.firstapp;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

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

}

Why am I getting this problem if the app was created by Eclipse choosing all the default options? How can I fix this issue?

Start by double checking both copies of `activity_main.xml` and the manifest for any errors then Clean your project. — Sam, Jan 04 '13 at 04:58
Eclipse > Project > check Build Automatically > Restart Eclipse — kongkea, Jan 04 '13 at 05:01
I just fixed it. I deleted the project, created another one and then cleaned all projects. I have no idea why this happens though. — lisovaccaro, Jan 04 '13 at 05:02
I tried cleaning the project and didn't do anything. Probably rebuilding and cleaning would have helped. But since I had not worked on the project yet I just created a new one (the error still appeared) and then cleaned all projects, then the error was gone. — lisovaccaro, Jan 04 '13 at 05:58

score 6 · Accepted Answer · edited May 23 '17 at 12:16

6

It might be because, there might be some problem in your res folder,

The Main reason might be there could be wrong import file of R.java. So Remove, if any import android.R;
There might be some images with same name, or some files with capital letters, or even there might be some errors in your xml files,
Try rebuilding and cleaning your project.

For some quick solutions to this problem, have a look at this,

R.java file not getting created

edited May 23 '17 at 12:16

Community

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1

answered Jan 04 '13 at 05:22

Sahil Mahajan Mj

11,033
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Nice explanation sahil... Very useful – malavika Jan 04 '13 at 05:29

score -1 · Answer 2 · answered Jan 04 '13 at 05:03

-1

first try to clean your project and after that build it through eclipse.If the problem persists after this operation than it means its because of your activity_main.xml

answered Jan 04 '13 at 05:03

Vsw10

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"R cannot be resolved to a variable" just after creating android project?

2 Answers2