title: Fragment parent layout transparent
body: <p>I use <code>circularRevealAnimation</code> to start one  of Fragments. Here's  its <code>layout</code>.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;io.codetail.widget.RevealFrameLayout  xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/main_container"
  android:background="@color/red"
  android:layout_width="match_parent"
  android:layout_height="match_parent"&gt;
  
  &lt;LinearLayout
      android:id="@+id/container2"
      android:layout_width="match_parent"
      android:background="@color/white"
      android:layout_height="match_parent"
      android:orientation="vertical"&gt;
  
     ....
  
  &lt;/LinearLayout&gt;
  
  &lt;/io.codetail.widget.RevealFrameLayout&gt;
  </code></pre>
  
  <p>In my <code>Fragment</code> class I trigger <code>revealAnimation</code> in <code>onStart()</code> method.</p>
  
  <pre><code>@Override
  public void onStart() {
      super.onStart();
      // SupportAnimator animator = ViewAnimationUtils.createCircularReveal(container2, 720, 0, 0, 1386); -&gt;line from onCreateView
      animator.setDuration(500);
      animator.setInterpolator(new AccelerateDecelerateInterpolator());
      animator.start();
      animator.addListener(new SupportAnimator.AnimatorListener() {
          @Override
          public void onAnimationStart() {
              System.out.println("lol222");
          }
  
          @Override
          public void onAnimationEnd() {
              System.out.println("end");
          }
  
          @Override
          public void onAnimationCancel() {
  
          }
  
          @Override
          public void onAnimationRepeat() {
  
          }
      });
  }
  </code></pre>
  
  <p>As you  see, the parent layout  has red color, when its child is white. When I started this <code>Fragment</code>  I can see  white circularReveal over the red background, when I want to see such animator over previous fragment. How can I achieve this?</p>
  
  <p>I tried to make <code>background="@null" and so on, while reading SOF related topics. Nothing helped me. So what is write way to set</code>Fragment<code>parent</code>layout<code>as</code>transparent`?</p>