title: Error parsing XML: not well-formed (invalid token) and all R's in red
body: <pre><code>    &lt;?xml version="1.0" encoding="utf-8"?&gt;
  
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:gravity="center"
      android:orientation="vertical" &gt;
  
      &lt;TextView
          android:="@+id/question_text_view"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:padding="24dp"
          android:id="@+id/textView" /&gt;
  
  
      &lt;LinearLayout
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:orientation="horizontal" &gt;
  
          &lt;Button
              android:id="@+id/true_button"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:text="@string/true_button" /&gt;
  
          &lt;Button
              android:id="@+id/false_button"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:text="@string/false_button" /&gt;
  
      &lt;/LinearLayout&gt;
  
  
      &lt;Button
          android:id="@+id/next_button"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="@string/next_button" /&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>And in the java main class it appears all the "R" in red and they say "cannot resolve symbol 'R'", all the tags are closed in the xml so i really don't know what is causing the problem.</p>