带阴影的弯曲Android工具栏

Question

我需要为工具栏或CardView提供弯曲的底视图。

我尝试过的事情：

bg_toolbar.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle" />
    </item>
    <item
            android:bottom="0dp"
            android:left="-100dp"
            android:right="-100dp"
            android:top="-80dp">
        <shape android:shape="oval">
            <solid android:color="@color/colorAccent" />
        </shape>
    </item>
</layer-list>

将此设置为工具栏的背景将使应用栏高程（阴影）无效。同样，如果将此背景应用于CardView，则设置了背景，但阴影与背景的形状不符。

见下图，我希望阴影围绕曲线。

Answer 1

我已经使用arcView完成了

依赖实现'com.github.florent37：shapeofview：1.3.2'

<com.github.florent37.shapeofview.shapes.ArcView
        android:layout_width="match_parent"
        android:layout_height="155dp"
        android:elevation="5.0dp"
        app:shape_arc_cropDirection="outside"
        app:shape_arc_height="35dp"
        app:shape_arc_position="bottom">

        <android.support.v7.widget.Toolbar
            android:layout_width="match_parent"
            android:layout_height="155dp"
            android:background="@color/colorPrimary"
            android:elevation="5dp" />

    </com.github.florent37.shapeofview.shapes.ArcView>

查看附件图片

Answer 2

  

尝试以下布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        app:elevation="0dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="@drawable/test1"
        android:gravity="center"
        android:padding="@dimen/_10sdp"
        android:text="My Title"
        android:textSize="@dimen/_20ssp"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/toolbar" />

</android.support.constraint.ConstraintLayout>

test1.xml

    <?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle" />
    </item>
    <item
        android:bottom="0dp"
        android:left="-100dp"
        android:right="-100dp"
        android:top="-80dp">
        <shape android:shape="oval">
            <solid android:color="#50CCCCCC" />
        </shape>
    </item>
    <item
        android:bottom="10dp"
        android:left="-100dp"
        android:right="-100dp"
        android:top="-80dp">
        <shape android:shape="oval">
            <solid android:color="@color/colorAccent"/>//Background Color
        </shape>
    </item>
</layer-list>

输出：