Android drawables;性能不佳的问题

Question

为了创建阴影斜角效果，我创建了一个可绘制的xml文件，该文件作为前景＆＃39;各种FrameLayouts的属性。

我在屏幕上有三个FrameLayouts，其中有一个可绘制的前景，其中一个包含Google地图，我注意到由drawable引起的性能下降（通过与Google地图交互显而易见） 。评论整个可绘制列表并恢复正常性能。

不可否认的是，绘画很多（七种形状，略有不同的颜色和混合，以创造一个漂亮的阴影斜面，让人联想到80年代的军事界面）。据推测，Android每次绘图操作都会执行整个操作，而不是缓存和重用结果？

有人可以建议如何保留视觉功能，但提高性能吗？

可绘制文件：

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:left="@dimen/BevelInset"
        android:top="@dimen/BevelInset"
        android:bottom="@dimen/BevelInset"
        android:right="@dimen/BevelInset">
        <shape
               android:shape="rectangle">
            <corners
                android:radius="@dimen/BevelRadius" />
            <stroke
                android:width="@dimen/BevelEdge"
                android:color="@color/ViewBevelColour" />
            <solid
                android:color="@color/TransparentColour" />

        </shape>
    </item>
    <item
        android:left="@dimen/BevelInset"
        android:top="0dp"
        android:bottom="0dp"
        android:right="0dp">
        <shape
            android:shape="rectangle">
            <corners
                android:radius="5dp" />
            <stroke
                android:width="5dp"
                android:color="@color/ViewBevelDarkColour" />
            <solid
                android:color="@color/TransparentColour" />

        </shape>
    </item>
    <item
        android:left="0dp"
        android:top="@dimen/BevelInset"
        android:bottom="0dp"
        android:right="0dp">
        <shape
            android:shape="rectangle">
            <corners
                android:radius="@dimen/BevelRadius" />
            <stroke
                android:width="@dimen/BevelEdge"
                android:color="@color/ViewBevelDarkColour" />
            <solid
                android:color="@color/TransparentColour" />

        </shape>
    </item>
    <item
        android:left="0dp"
        android:top="0dp"
        android:bottom="@dimen/BevelInset"
        android:right="0dp">
        <shape
            android:shape="rectangle">
            <corners
                android:radius="@dimen/BevelRadius" />
            <stroke
                android:width="@dimen/BevelEdge"
                android:color="@color/ViewBevelLightColour" />
            <solid
                android:color="@color/TransparentColour" />

        </shape>
    </item>
    <item
        android:left="0dp"
        android:top="0dp"
        android:bottom="0dp"
        android:right="@dimen/BevelInset">
        <shape
            android:shape="rectangle">
            <corners
                android:radius="@dimen/BevelRadius" />
            <stroke
                android:width="@dimen/BevelEdge"
                android:color="@color/ViewBevelLightColour" />
            <solid
                android:color="@color/TransparentColour" />

        </shape>
    </item>
    <item
        android:left="@dimen/BevelBlend"
        android:top="@dimen/BevelBlend"
        android:bottom="@dimen/BevelBlend"
        android:right="@dimen/BevelBlend">
        <shape
            android:shape="rectangle">
            <corners
                android:radius="@dimen/BevelRadius" />
            <stroke
                android:width="@dimen/BevelEdge"
                android:color="@color/ViewBevelBlendColour" />
            <solid
                android:color="@color/TransparentColour" />

        </shape>
    </item>
    <item>
        <shape
               android:shape="rectangle">
            <stroke
                android:width="@dimen/BevelEdge"
                android:color="@color/ViewBevelColour" />
            <solid
                android:color="@color/TransparentColour" />
        </shape>
    </item>
</layer-list>

样式值：

<resources>
    <color name="ViewBevelColour">#ff004f4f</color>
    <color name="ViewBevelDarkColour">#3f000000</color>
    <color name="ViewBevelLightColour">#3fffffff</color>
    <color name="ViewBevelBlendColour">#7f004f4f</color>
    <color name="BackgroundColour">#ff000000</color>
    <color name="TransparentColour">#00ffffff</color>
    <dimen name="BevelInset">3dp</dimen>
    <dimen name="BevelEdge">5dp</dimen>
    <dimen name="BevelRadius">5dp</dimen>
    <dimen name="BevelBlend">1dp</dimen>
    <dimen name="BevelTotal">8dp</dimen>
    <color name="DividerColour">#ff00ff00</color>

    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <item name="android:windowBackground">@color/BackgroundColour</item>
        <item name="android:textColor">#ffff0000</item>
    </style>

</resources>