使用android.support.design.circularreveal.cardview.CircularRevealCardView显示效果

Question

我想像WhatsApp的附件功能一样创建一个揭示效果。我在环顾四周创建自定义内容时，在没有添加任何外部库的情况下，我发现了Android的android.support.design.circularreveal.cardview.CircularRevealCardView视图。

我这样实现了这个视图： -

<?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>

这在我的应用程序上显示正常，就像普通的CardView一样，我可以在按钮点击时将其设置为可见/不可见。但是我无法在网上找到任何实现如何应用揭示动画同时使该视图可见的实现。是否有内置功能来应用动画或我是否必须自己创建一个？

Answer 1

请试试这个

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();