创建使用图层列表渐变笔触 [英] creating gradient stroke using layer-list

问题描述

我试图使用层列表来创建渐变中风（即外围/边框）作为我的观点的背景。但它不工作。

I am trying to use layer-list to create a gradient stroke (i.e. perimeter/border) as the background of my view. But it's not working.

下面是我的code

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <item>
        <shape android:shape="rectangle" >
            <gradient
                android:angle="270"
                android:centerColor="#FFFFFFFF"
                android:endColor="#FFCCCCCC"
                android:startColor="#FFCCCCCC"
                android:type="linear" />
        </shape>
    </item>
    <item>
        <shape android:shape="rectangle" >
            <solid android:color="#F0F1F3" />

            <margin
                android:bottom="4dp"
                android:left="4dp"
                android:right="4dp"
                android:top="4dp" />
        </shape>
    </item>

</layer-list>

中的第一项是不可见的。只有第二项充满屏幕。关于如何解决这一问题有什么想法？

The first item is not visible at all. only the second item fills the screen. Any thoughts on how to fix this?

推荐答案

这也许可以使用，它创造了一些阴影效果

Maybe this can be of use, it create some shadow effect

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <!-- Drop Shadow Stack -->
    <item>
        <shape>
            <corners android:radius="12dp" />

            <padding
                android:bottom="1dp"
                android:left="1dp"
                android:right="1dp"
                android:top="1dp" />

            <solid android:color="#00CCCCCC" />
        </shape>
    </item>
    <item>
        <shape>
            <corners android:radius="12dp" />

            <padding
                android:bottom="1dp"
                android:left="1dp"
                android:right="1dp"
                android:top="1dp" />

            <solid android:color="#10CCCCCC" />
        </shape>
    </item>
    <item>
        <shape>
            <corners android:radius="12dp" />

            <padding
                android:bottom="1dp"
                android:left="1dp"
                android:right="1dp"
                android:top="1dp" />

            <solid android:color="#20CCCCCC" />
        </shape>
    </item>
    <item>
        <shape>
            <corners android:radius="12dp" />

            <padding
                android:bottom="1dp"
                android:left="1dp"
                android:right="1dp"
                android:top="1dp" />

            <solid android:color="#30CCCCCC" />
        </shape>
    </item>
    <item>
        <shape>
            <corners android:radius="12dp" />

            <padding
                android:bottom="1dp"
                android:left="1dp"
                android:right="1dp"
                android:top="1dp" />

            <solid android:color="#50CCCCCC" />
        </shape>
    </item>

    <!-- Background -->
    <item>
        <shape>
            <solid android:color="@android:color/black" />

            <corners android:radius="12dp" />
        </shape>
    </item>

</layer-list>

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