R cannot be resolved to a variable eclipse android

Question

I already tried all the answers present in this website. Deleted the "import android.R;" line. Even then every time I run my project it says "Your project contains errors, fix them before running your application". I'm working on Eclipse. As soon as I create a new android application project I am encountered with 2 errors which say “R cannot be resolved to a variable”. Here's my code for MainActivity.Java

    package com.example.myfirstapp;


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


    class MainActivity extends Activity {

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentViewq(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.main, menu);
        return true;
    }

}

looks like you need to clean your project! Make sure to fix your xml errors first. — Lazy Ninja
– Lazy Ninja, Commented Jun 7, 2013 at 9:19
it could be anything, in my project, R stopped resolving because I had images with uppercase letters in my res/drawable folder. I was not aware of this, renamed them with all lowercase and R suddenly worked/resolved :) — Lars Anundskås
– Lars Anundskås, Commented Feb 26, 2014 at 0:25

rahul · Accepted Answer · 2013-06-07 13:51:27Z

4

just try this at your imports

    import your_packgae_name.R;

answered Jun 7, 2013 at 13:51

rahul

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Comments

sonali8890 · Accepted Answer · 2013-06-07 10:39:44Z

2

If you are getting same problem when creating new project then the problem is with your SDK Version.

Update your SDK to rev. 22.0.1 After updating you will find new tool in SDK manager that is android SDK build tools.

thn install that tool also.

Hope this will help you.

answered Jun 7, 2013 at 10:39

sonali8890

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2 Comments

Saad Rehman Over a year ago

I got this Cannot complete the request. See the error log for details. "Android Traceview" will be ignored because it is already installed. "Tracer for OpenGL ES" will be ignored because it is already installed. "Android Development Tools" will be ignored because it is already installed. "Android Hierarchy Viewer" will be ignored because it is already installed. "Android DDMS" will be ignored because it is already installed.

sonali8890 Over a year ago

open SDK manager directly and if update is available then update it.

GaelDev · Accepted Answer · 2013-06-07 09:29:30Z

1

Right click on the project's folder and then, Android Tools --> Run Lint - check for commons error. When this don't work, disable automated build, clean projet, run lint again --> build.

Ah also, in the proprierties -> Android, verify that build target is checked...

answered Jun 7, 2013 at 9:29

GaelDev

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Michael 'Maik' Ardan · Accepted Answer · 2013-06-07 09:33:26Z

1

Delete the imported android.R (As what you did)
Re-import R
Eclipse will allow you to choose which should be imported. Choose the R from your package.

answered Jun 7, 2013 at 9:33

Michael 'Maik' Ardan

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3 Comments

Saad Rehman Over a year ago

Theres just one option to import which says "import R(android) The rest are "create class" options

Michael 'Maik' Ardan Over a year ago

That's odd. Can you upload your project file somewhere?

Saad Rehman Over a year ago

Yeah sure I can do that. Where do I upload it?

yogagunda · Accepted Answer · 2013-07-22 11:40:22Z

1

I had the same problem.

The R.Java was not generated(in the gen folder).

There was no error in the xml file.

The issue was that I did not update the sdk completely.

In the SDK manager we need to install the package whenever the "install(number) packages" button is enabled and close and open the sdk manager to check for updates.

Close and reopen eclipse and check for updates in eclipse also.

answered Jul 22, 2013 at 11:40

yogagunda

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Comments

Aerrow · Accepted Answer · 2013-06-07 09:17:23Z

0

Make sure this line,

setContentView(R.layout.activity_main);

in your code it contains "q".

Then build your application and then run

answered Jun 7, 2013 at 9:17

Aerrow

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4 Comments

Saad Rehman Over a year ago

No no it doesn't. That was just a typo. The main issue is that R.

Saad Rehman Over a year ago

<RelativeLayout xmlns:android="schemas.android.com/apk/res/android" xmlns:tools="schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <TextView android:layout_width="wrap_content"

Saad Rehman Over a year ago

android:layout_height="wrap_content" android:text="@string/hello_world" /> </RelativeLayout>

Aerrow Over a year ago

@SaadRehman: Restart your eclipse ide, (this is silly trick but the R file will be generated)

AndyFaizan · Accepted Answer · 2013-06-07 09:19:17Z

0

One of your xml files might have errors. Hence, R is not generated. Fix them and R will be generated and the errors will be removed.

answered Jun 7, 2013 at 9:19

AndyFaizan

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4 Comments

Lazy Ninja Over a year ago

this should go to comments!

Saad Rehman Over a year ago

I just created a new project. How can it still have errors? I'm new to android and I don't know where the error in xml might be

AndyFaizan Over a year ago

@LazyNinja: Yes. I realise that now :/

AndyFaizan Over a year ago

@SaadRehman: There should be an activity_main.xml in your res/layouts folder. Open it to see if you've got errors. Refer any beginner's guide to android. You'll get to know what to do.

Nirali · Accepted Answer · 2013-06-07 09:22:53Z

0

Check if file "R.java" exists in folder "gen"

When aapt can not compile the resources, the R class can not be created. Look for errors in the resources of your Application.

More output you can find in the ErrorLog and Console window

(Eclipse Window menu->show view->Console (and choose "Android" in Console popup menu)).

edited Jun 7, 2013 at 9:22

Nirali

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answered Jun 7, 2013 at 9:20

matreshkin

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2 Comments

Saad Rehman Over a year ago

Where do I have to look for the error? I just created the new project!

matreshkin Over a year ago

Do: 1 Window menu->show view->Console 2.choose "Android" in Console popup menu. 3. Clean project (Project menu->check off "Build automatically") 4. Project menu->Clean... 5. Select your project, check on "Start build immediately"->OK. 6. Show errors in "Problems" window, and "Console" window

Ann ann · Accepted Answer · 2013-06-07 09:22:57Z

0

check your drawables and make sure there is no file with capital letters to avoid error! .

answered Jun 7, 2013 at 9:22

Ann ann

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Comments

Community · Accepted Answer · 2017-05-23 10:27:31Z

0

Did you start the project a while back and recently it has done this when you went to work on it? I had the same issue and recently came to find an answer. It could be that the problem is you need to go into the SDK manager and install a particular update as per the answer to this question: Eclipse error: R cannot be resolved to a variable

edited May 23, 2017 at 10:27

CommunityBot

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answered Jun 29, 2013 at 18:22

sardonicus87

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Comments

Rehan · Accepted Answer · 2013-10-30 07:02:03Z

0

Try this once

Go to Project

Check Mark "Build Automatically"

and Restart Eclipse

answered Oct 30, 2013 at 7:02

Rehan

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Comments

user3024897 · Accepted Answer · 2013-11-23 13:14:52Z

Okay so I had the same problem, and I also tried everything: Check for bad naming, remove the import statement, installed the Android SDK Build-tools, check the AndroidManifest.xml, reinstall eclipse and android SDK etc. nothing worked.

And I was even working with a completely blank project (new -> android project)

I then found out that the android SDK comes with an already zipped eclipse, so I thought I might as well try that one.

So I uninstalled eclipse 64bit, and used the one which comes with the android SDK (http://developer.android.com/sdk/index.html#win-bundle) and now I dont get the error anymore, so give it a try.

I also found that using eclipse 64bit with a java 32bit version might cause problems. So it might be that the one that comes with the Android SDK vertion is the 32bit eclipse.

Hope this helps.

Josh Crozier · Accepted Answer · 2013-12-13 01:36:14Z

0

The problem was caused by incompatibility of version. Here are the steps to fix the problem:

Right click the project properties.
Select Android
Select correct Project build target. I fixed mine.

edited Dec 13, 2013 at 1:36

Josh Crozier

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answered Dec 13, 2013 at 1:13

user3097695

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1 Comment

user3097695 Over a year ago

I copy the project from office computer to a home computer. The project was set to Android 4.1.2. When it was imported to home computer, it was imported as 4.2.2.

Arundas K V · Accepted Answer · 2014-01-03 09:36:01Z

0

I found this way working Awesome. Which is also slightly similar to Mr.AndyFaizan,

Check any of your xml files have errors or not.if yes R might not generate.

2.Fix the error at XML files. Then R will be generated automatically

Then import the R which is suitable for your package.
YES, your error "R cannot be resolved" Gone!!

answered Jan 3, 2014 at 9:36

community wiki

Arundas K V

Comments

Mehdi · Accepted Answer · 2016-10-02 06:14:01Z

0

if this error occur immediately after create your project on eclipse. the main reason is manifest.xml error. application icon path is wrong. copy ic_launcher.png into drawable folders.

answered Oct 2, 2016 at 6:14

Mehdi

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