title: No resource type specified (at 'id' with value '@+id\st')
body: <p>I'm new at android programming, I'm now trying to make some <em>buttons</em>, I configured these buttons using the following code:</p>
  
  <p>The <strong>MainActivity</strong> class :</p>
  
  <pre><code>public class MainActivity extends Activity
  {
      /** Called when the activity is first created. */
  
      Button st,nd,center;
      @Override
      public void onCreate(Bundle savedInstanceState)
      {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.main);
  
          st = (Button)findViewById(R.id.st);
          st = (Button)findViewById(R.id.center);
          st = (Button)findViewById(R.id.nd);
  
  
      }
  }
  </code></pre>
  
  <p>and the <strong>XML Layout</strong>:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:orientation="vertical"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:background="@drawable/background"
      &gt;
  &lt;TextView
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:text="Hello from animation!!"
      /&gt;
  &lt;button android:layout_width="100dp"
  android:layout_height="50dp"
  android:text="1st half"
  android:id="@+id\st"
  /&gt;
  // and the other two points defined the same way
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>And i got that syntax error:</p>
  
  <pre><code>error: Error: No resource type specified (at 'id' with value '@+id\st').
  // and the same error with the other two buttons
  </code></pre>
  
  <p><strong>HINT:</strong> The <code>R class</code> is imported and accessible from the <code>MainActivity</code> class but it can't read <code>R.id</code>.</p>