<layer-list>后台禁用android:填充设置

Question

我有一个带有自定义项布局和自定义背景的ListView。问题是，在我将背景绘图从android:padding切换到<layer-list>之后，似乎忽略了<layer-list>值。

layout/list_item.xml

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout_list_item_bill"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="12dp">

    . . .
</LinearLayout>

drawable/list_item_background.xml

<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
        <solid android:color="@color/white" />
        <corners android:radius="@dimen/corner_radius" />
        <stroke android:width="1dp" android:color="@color/blue" />
</shape>

上述工作如预期的那样。当我将drawable/list_item_background.xml更改为

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item>
        <shape>
            <solid android:color="@color/white"/>
        </shape>
    </item>

    <item>
        <shape android:shape="rectangle">
            <solid android:color="@color/white" />
            <corners android:radius="@dimen/corner_radius" />
            <stroke android:width="1dp" android:color="@color/blue" />
        </shape>
    </item>

</layer-list>

我遗漏了什么？

Answer 1

将<layer-list>封装在<selector>中解决了这个问题：

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <layer-list>
            <item>
                <shape>
                    <solid android:color="@color/white"/>
                </shape>
            </item>
            <item>
                <shape android:shape="rectangle">
                    <solid android:color="@color/white" />
                    <corners android:radius="@dimen/corner_radius" />
                    <stroke android:width="1dp" android:color="@color/blue" />
                </shape>
            </item>
        </layer-list>
    </item>
</selector>