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我想创建一个类似 WhatsApp 附件功能的显示效果。在环顾四周以创建自定义内容时，我发现 Android 的android.support.design.circularreveal.cardview.CircularRevealCardView视图已经可用，而无需添加任何外部库。

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，就像常规 CardView 一样，我可以在单击按钮时将其设置为可见/不可见。但是，我在网上找不到任何实现，显示如何在使该视图可见的同时应用显示动画。是否有应用动画的内置功能，还是我必须自己创建一个？

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1 回答 1

0

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();
于 2019-02-13T06:50:11.153 回答