title: How to set a transparent border button
body: <p>I'm trying to set a transparent <code>button</code>, I create a layout <code>camera</code> and one <code>button</code> overlay the preview, but the <code>button</code> is orbed and I see a square background border. How can get off this border? </p>
  
  <hr>
  
  <pre><code>&lt;FrameLayout
      android:layout_width="wrap_content"
      android:layout_height="wrap_content" 
      android:layout_alignParentBottom="true"
      android:layout_centerInParent="true"&gt;
  
      &lt;Button
          android:id="@+id/camera_button"
          android:layout_width="90dp"
          android:layout_height="90dp" 
          android:layout_gravity="center"
  
          /&gt;
  
      &lt;ImageView
          android:contentDescription="@string/camera_button"
          android:background="@android:color/transparent"
          android:layout_width="85dp"
          android:layout_height="85dp"
          android:layout_gravity="center"
          android:scaleType="fitXY"
          android:src="@drawable/camera_buton" /&gt;
  &lt;/FrameLayout&gt;
  </code></pre>
  
  <p>Thx a lot </p>