title: android make my LinearLayout zoomable
body: <p>i have a LinearLayout, wrapped in a <code>ScrollView</code>, that contains mostly <code>TextViews</code> and sometimes <code>ImageViews</code>. Now i want to give the user the possibility to zoom in(and out again) with two fingers. Is there an easy way to do that? Here is the extract from the xml-file:</p>
  
  <pre><code>&lt;ScrollView
      android:background="@color/transparent"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_gravity="top"&gt;
  
      &lt;LinearLayout
          android:background="@color/transparent"
          android:id="@+id/layout"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:orientation="vertical"
          android:layout_gravity="top|center_horizontal"&gt;&lt;/LinearLayout&gt;
  &lt;/ScrollView&gt;
  </code></pre>