Eclipse: "R cannot be resolved to a variable" in Android code

[waqas imtiaz]

Hi
I have installed eclipse and followed steps by installing the install new software and setting up sdk as well. removed android.R import, added com.home.begingwithandroid.R import but still nothing works for me. Please help me on this.

Thanks.

[Paul Clapham]

Can I guess that you're referring to some Java code? If so, then could you post that code so we could see it? If not, then maybe you could clarify your question by providing more details?

[Ulf Dittmer]

What does "nothing works for me" mean? If there are error messages, post them. Also tell us whether you want to refer to something in android.R, or your own app's R class. If the latter, is your main package really "com.home.begingwithandroid"? That "g" is suspicious; is that a typo? Furthermore, tell us what specific element you're trying to refer to, and in which way you think you have have defined it. Also tell us in which package the class is that causes the problem. In short, as Paul said: TellTheDetails

@Paul: The "R" class is an Android-specific class that gets created automatically by the compiler. So the rules of importing and using it are not quite the same as for "normal" Java classes.

[waqas imtiaz]

Following is the code of the problem.

package com.home.begingwithandroid;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends ActionBarActivity {

    @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.main, 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();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

here 'R' is the problem.
With 'R' it gives following error:

"R cannot be resolved to a variable"

Does this clear the scenario? Please tell me if more explanation is required.

[waqas imtiaz]

I mean I have tried to search over the internet to fix this problem but nothing has worked for me.

Well, I am new, I have just installed eclipse and tried to run this code written in book but this error pops up. I do not know what is "android.R or what is my own app's R class" as I am new to it.

Please help me on this

[Ulf Dittmer]

From your code it's clear you're trying to use your own package's R class, not Android's. That gets us back to:

is your main package really "com.home.begingwithandroid"? That "g" is suspicious; is that a typo?

The main package is set in the AndroidManifest.xml file; what is it?

[waqas imtiaz]

Ulf Dittmer wrote:From your code it's clear you're trying to use your own package's R class, not Android's. That gets us back to:

is your main package really "com.home.begingwithandroid"? That "g" is suspicious; is that a typo?

The main package is set in the AndroidManifest.xml file; what is it?

Package from AndroidManifest.xml is:

package="com.home.begingwithandroid"

[Ulf Dittmer]

That looks correct. I suspect something is wrong with the Eclipse Android setup, so I'll add this discussion to the IDE forum as well.

[waqas imtiaz]

Ulf Dittmer wrote:That looks correct. I suspect something is wrong with the Eclipse Android setup, so I'll add this discussion to the IDE forum as well.

So what should I do untill it is fixed?

[Ulf Dittmer]

Google for answers, and tinker around with your Eclipse project. It's not a given that will get a solution here quickly (or ever, actually), so you should have a backup plan how to solve this.

[waqas imtiaz]

Ulf Dittmer wrote:Google for answers, and tinker around with your Eclipse project. It's not a given that will get a solution here quickly (or ever, actually), so you should have a backup plan how to solve this.

Alright
Thanks