Reveal effect with android.support.design.circularreveal.cardview.CircularRevealCardView

Question

I wanted to create a reveal effect like WhatsApp's attachment feature. I while looking around to create something custom, I came across Android's android.support.design.circularreveal.cardview.CircularRevealCardView view available already without adding any external library.

I implemented this view like so :-

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.circularreveal.cardview.CircularRevealCardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/ccv_attachment_reveal"
    style="@style/style_mw"
    android:elevation="@dimen/dimen_2dp"
    android:orientation="vertical"
    android:padding="@dimen/dimen_margin_16dp"
    app:cardCornerRadius="@dimen/dimen_8dp"
    >

    <android.support.v7.widget.LinearLayoutCompat
        style="@style/style_mw"
        android:orientation="vertical">

        <RelativeLayout
            android:id="@+id/rl_attachment_first_row"
            style="@style/style_ww"
            android:layout_marginStart="@dimen/dimen_30dp"
            android:layout_marginTop="@dimen/dimen_margin_16dp"
            android:layout_marginEnd="@dimen/dimen_30dp">

            <android.support.design.widget.FloatingActionButton
                android:id="@+id/fab_add_gallery_image"
                style="@style/style_ww"
                android:layout_alignParentStart="true"
                android:src="@drawable/ic_gallery_image"/>

            <android.support.design.widget.FloatingActionButton
                android:id="@+id/fab_add_camera_image"
                style="@style/style_ww"
                android:layout_centerHorizontal="true"
                android:src="@drawable/ic_camera"/>

        </RelativeLayout>

        <RelativeLayout
            style="@style/style_ww"
            android:layout_marginStart="@dimen/dimen_30dp"
            android:layout_marginTop="@dimen/dimen_margin_16dp"
            android:layout_marginEnd="@dimen/dimen_30dp"
            android:layout_marginBottom="@dimen/dimen_margin_16dp">

            <android.support.design.widget.FloatingActionButton
                android:id="@+id/fab_add_gallery_image1"
                style="@style/style_ww"
                android:layout_alignParentStart="true"
                android:src="@drawable/ic_gallery_image"/>

            <android.support.design.widget.FloatingActionButton
                android:id="@+id/fab_add_camera_image1"
                style="@style/style_ww"
                android:layout_centerHorizontal="true"
                android:src="@drawable/ic_camera"/>
        </RelativeLayout>
    </android.support.v7.widget.LinearLayoutCompat>
</android.support.design.circularreveal.cardview.CircularRevealCardView>

This displays fine on my app like a regular CardView and I can set it visibile/invisible on a button click. But however I cannot find any implementations online showing how to apply the reveal animation while making this view visible. Is there an in built feature to apply the animation or do I have to create one myself?

Answer 1

Please try this

int x = layoutContent.getRight();
int y = layoutContent.getBottom();

int startRadius = 0;
int endRadius = (int) Math.hypot(layoutMain.getWidth(), layoutMain.getHeight());

Animator anim = ViewAnimationUtils.createCircularReveal(layoutButtons, x, y, startRadius, endRadius);

layoutButtons.setVisibility(View.VISIBLE);
anim.start();