ViewAnimationUtils - No animation occurs

I'm trying to use a Circular Reveal to animate in a LinearLayout on click of a FAB.

Onclick, the view changes to become visible after a time delay, but no visible animation runs? In addition, when the function is reversed as an exit animation the view is invisible for the duration of the animation.

The code:

//Rest of method triggered onClick Above
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){
        circleReveal(formcontainer,addnewbutton);
        ObjectAnimator.ofFloat(addnewbutton, "translationY", -heightbutton).start();
    }
}

public void circleReveal(LinearLayout formLayout, FloatingActionButton fab) {

    int cx = (fab.getLeft() + fab.getRight()) / 2;
    int cy = (fab.getTop() + fab.getBottom()) / 2;

    int radius = Math.max(formLayout.getWidth(), formLayout.getHeight());

    Animator reveal = createCircularReveal(formLayout, cx, cy, 0, radius);

    formLayout.setVisibility(View.VISIBLE);
    reveal.setDuration(2000);
    reveal.start();
}

Many thanks in advance for your help!

[EDIT] After testing, i've noticed that it's just this view that it fails on? Every other view in my layout that i've tried works fine?

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:id="@+id/formcontainer"
              android:background="@android:color/white"
              android:layout_width="match_parent"
              android:layout_height="65dp"
              android:orientation="vertical"
              android:baselineAligned="false"
              android:paddingLeft="@dimen/activity_horizontal_margin"
              android:paddingRight="@dimen/activity_horizontal_margin"
              android:gravity="bottom"
              android:layout_marginBottom="0dp"
              android:elevation="4dp"
              android:layout_alignParentBottom="true">

[EDIT 2] So, i've partially solved the issue, in that the animation now works, but only when the centre is not calculated from the FAB?

The circular animation runs with respect to the View itself. So, your center should be:

int cx = fab.getWidth() / 2;
int cy = fab.getHeight() / 2;