title: ImageView in android XML layout with layout_height="wrap_content" has padding top & bottom
body: <p>I have a vertical LinearLayout containing an ImageView and a few other layouts and views.</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="match_parent"
      android:layout_height="match_parent"&gt;
  
      &lt;ImageView
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:contentDescription="@string/banner_alt"
          android:src="@drawable/banner_portrait" /&gt;
  
      &lt;TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/main_search"
        android:gravity="center"
        android:textStyle="bold" /&gt;
  
      &lt;LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" &gt;
  
        &lt;Spinner
          android:id="@+id/search_city_spinner"
          android:layout_width="0px"
          android:layout_height="wrap_content"
          android:layout_weight="1"
          android:prompt="@string/search_city_prompt"
          android:entries="@array/search_city_array" /&gt;
  
        &lt;Spinner
          android:id="@+id/search_area_spinner"
          android:layout_width="0px"
          android:layout_height="wrap_content"
          android:layout_weight="1"
          android:prompt="@string/search_area_prompt"
          android:entries="@array/search_area_array" /&gt;
  
      &lt;/LinearLayout&gt;
  
      &lt;LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" &gt;
  
        &lt;Spinner
          android:id="@+id/search_rooms_spinner"
          android:layout_width="0px"
          android:layout_height="wrap_content"
          android:layout_weight="1"
          android:prompt="@string/search_rooms_prompt"
          android:entries="@array/search_rooms_array" /&gt;
  
        &lt;Spinner
          android:id="@+id/search_min_spinner"
          android:layout_width="0px"
          android:layout_height="wrap_content"
          android:layout_weight="1"
          android:prompt="@string/search_min_prompt"
          android:entries="@array/search_min_array" /&gt;
  
        &lt;Spinner
          android:id="@+id/search_max_spinner"
          android:layout_width="0px"
          android:layout_height="wrap_content"
          android:layout_weight="1"
          android:prompt="@string/search_max_prompt"
          android:entries="@array/search_max_array" /&gt;
  
      &lt;/LinearLayout&gt;
  
      &lt;Button
        android:id="@+id/saearch_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/search_button"
        android:onClick="searchButton" /&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>My problem is that when the activity is displayed, the ImageView has a padding at the top &amp; bottom. I've confirmed it is the ImageView (by setting a background colour on the ImageView).</p>
  
  <p>The image is 450x450px. Setting the height manually to 450px produces the desired effect (no padding), and setting it to 450dp produces the same effect as using wrap_content.</p>
  
  <p>It seems that android is taking the height of the image (450px) and setting the height of the ImageView to the same value, but in dp.</p>
  
  <p>Any ideas as to what I can do to fix this? I don't want to use absolute values as I'll be providing different images for different screen densities.</p>