Error in XML file. Android programming
<p>I am new to android programming and recently installed Eclipse junos and ADT plugin on my ubuntu system and downloaded the android SDK. After this, i created an android project, which by default is the hello world program, when i run this program i got an error "Error in an XML file: aborting build.". But i haven't edited any code. Please help me solve this problem.
Below is the program.
I get an error also saying R cannot be resolved to a variable.</p>

<pre><code>package com.example.myandroid;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

public class MainActivity extends Activity {

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

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}
</code></pre>

<p>Here is the activity_main.xml</p>

<pre><code>  &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent" &gt;
    &lt;TextView android:layout_width="wrap_content" 
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true" 
            android:layout_centerVertical="true" 
            android:text="@string/hello_world" 
            tools:context=".MainActivity" /&gt; 
&lt;/RelativeLayout&gt;
</code></pre>
