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

Question

I have installed eclipse and followed steps by installing the install new software and setting up sdk as well. but error in MainActivity.java is "R cannot be resolved to a variable". Please help me on this.

following is the code

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);
}
}

thanks

XML code is

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hellp"/>

    <TextView 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/This is my first Android Application"/>

    <Button 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/And this is clickable button!"/>

</LinearLayout>

classic error... see these : http://stackoverflow.com/questions/7824730/r-cannot-be-resolved-to-a-variable http://stackoverflow.com/questions/16642604/eclipse-error-r-cannot-be-resolved-to-a-variable http://stackoverflow.com/questions/2757107/developing-for-android-in-eclipse-r-java-not-generating — Mohammed Ali, Nov 17 '14 at 14:44
Its been six days, right from the start of the day till the end of the day. I try to fix this problem but still not been able to fix it. Please help — user3440868, Nov 18 '14 at 12:51
setContentView(R.layout.activity_main); is the error on this line? — Mohammed Ali, Nov 18 '14 at 13:03
is there an import named - import android.R; or anything like this in your mainActivity? And what error shows on line - setContentView(R.layout.activity_main)? — Mohammed Ali, Nov 18 '14 at 13:14
I just downloaded new eclipse and it worked for me. That's it. — user3440868, Nov 19 '14 at 10:22

Mohammad Rahchamani · Answer 1 · 2014-11-18T07:41:51.287

0

the problem is in your xml file

<TextView 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hellp"/>

<TextView 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/This is my first Android Application"/>

<Button 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/And this is clickable button!"/>

when using @string/This is my first Android Application it means you have a string named This is my first Android Application in your strings file. if you want to show that text exactly, just remove @string from it.

edited Nov 18 '14 at 07:41

answered Nov 17 '14 at 14:39

Mohammad Rahchamani

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After importing. A new error is discovered The import com.home.begingwithandroid.R cannot be resolved Please help? – user3440868 Nov 18 '14 at 04:36
then you have an error in your `xml` files. check error log to find problem. – Mohammad Rahchamani Nov 18 '14 at 07:17
Actually I am writing this xml file from a book. I have matched this xml code with the one in the book. But found no errors. I have updated question with this xml code as well. Please do let me know if there is some error. Thanks – user3440868 Nov 18 '14 at 07:37
see my updated answer! – Mohammad Rahchamani Nov 18 '14 at 07:42
Well, when I try to run the project it says: Your project contains error(s) : please fix them before running the project. And there is no error in xml but R is not resolved at all. – user3440868 Nov 18 '14 at 08:22
Changed the xml code. But still says can not resolve R. – user3440868 Nov 18 '14 at 09:59

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

1 Answers1