title: What does this Android Lint Mean: "Wrong orientation?"
body: <p>I'm running Android lint in eclipse and get a error:</p>
  
  <blockquote>
    <p>Wrong orientation? No orientation specified, and the default is
    horizontal, yet this layout has multiple children where at least one
    has layout_width="match_parent"</p>
    
    <p>Issue: Checks that LinearLayouts with multiple children set the
    orientation Id: Orientation</p>
  </blockquote>
  
  <p>And this is the error code:</p>
  
  <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="fill_parent"
      android:layout_height="@dimen/cell_height_1_of_3" &gt;
  
      &lt;ImageView
          android:id="@+id/item_cover"
          android:layout_width="wrap_content"
          android:layout_height="fill_parent"
          android:layout_gravity="left"
          android:layout_marginLeft="8dp"
          android:scaleType="fitCenter"
          android:src="@drawable/doc_item_icon" /&gt;
  
      &lt;ImageView
          android:layout_width="fill_parent"
          android:layout_height="@dimen/cell_height_1_of_3"
          android:background="#0000"
          android:padding="5dp"
          android:scaleType="centerInside"
          android:visibility="gone" /&gt;
  
      &lt;TextView
          android:id="@+id/item_title"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent"
          android:ellipsize="end"
          android:gravity="center"
          android:maxLines="1"
          android:text="Add new"
          android:textColor="@color/office_color"
          android:textSize="@dimen/textview_small_size" /&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>What does it mean? What will happen if I ignored this lint error?</p>