Fragment Circular Reveal animation

Fragment.java

import android.graphics.Color;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.view.animation.AccelerateInterpolator;

import java.util.Random;

import butterknife.ButterKnife;
import butterknife.InjectView;
import codetail.animation.Animator;
import codetail.animation.ViewAnimationUtils;
import codetail.utils.ViewUtils;

public class RandomFragment extends Fragment {

    @InjectView(R.id.container)
    View container;

    @InjectView(R.id.first)
    View first;

    @InjectView(R.id.second)
    View second;

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        ViewUtils.setBackground(container, null);
        return inflater.inflate(R.layout.sample_fragment, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        ButterKnife.inject(this, view);

        ViewUtils.setBackground(view, null);
        first.setBackgroundColor(randomColor());
        second.setBackgroundColor(randomColor());

        first.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                reveal();

                ViewUtils.removeGlobalListeners(first, this);
            }
        });
    }

    void reveal(){
        View view = container;

        int finalRadius = Math.max(view.getWidth(), view.getHeight());

        Animator animator =
                ViewAnimationUtils.createCircularReveal(view, 0, 0, 0, finalRadius);
        animator.setInterpolator(new AccelerateInterpolator());
        animator.setDuration(3500);
        animator.start();
    }

    static int randomColor(){
        Random random = new Random();
        return Color.HSVToColor(new float[]{
                random.nextInt(360),
                0.70f,
                0.70f
        });
    }
}

sample_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<codetail.widget.RevealFrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


    <LinearLayout
        android:id="@+id/container"
        android:background="@null"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:weightSum="2">

        <FrameLayout
            android:id="@+id/first"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"/>

        <FrameLayout
            android:id="@+id/second"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"/>


    </LinearLayout>

</codetail.widget.RevealFrameLayout>