安卓 : Border only on corners

Question

在我的 android 应用程序中，我只需要在四个角上添加边框，如图(白色)所示。

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="0dip"
        android:layout_weight="6">
        <VideoView
            android:id="@+id/video1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_gravity="center" />
        <View
            android:layout_width="150dp"
            android:layout_height="150dp"
            android:layout_centerInParent="true"
            android:background="@drawable/cornerbg" />
    </RelativeLayout>

cornerbg.xml

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

        <item>
            <shape android:shape="rectangle" >
                <solid android:color="@color/transparent" />
                <stroke
                    android:width="1dp"
                    android:color="@color/btn_border"
                    android:dashWidth="50dp" // I tried this but not getting expected 
                    android:dashGap="60dp"/>

            </shape>
        </item>
        </layer-list>

我如何为此编写 xml？

请帮忙，谢谢

Answer 1

下面是不依赖于矩形宽度和高度的可绘制对象，您可以将此可绘制对象用于纵向和横向。请调整边框的宽度和高度:

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:width="8dp"
        android:height="48dp"
        android:gravity="top|left">
        <shape android:shape="rectangle">
            <solid android:color="#FFFFFF" />
        </shape>
    </item>
    <item
        android:width="48dp"
        android:height="8dp"
        android:gravity="top|left">
        <shape android:shape="rectangle">
            <solid android:color="#FFFFFF" />
        </shape>
    </item>
    <item
        android:width="8dp"
        android:height="48dp"
        android:gravity="top|right">
        <shape android:shape="rectangle">
            <solid android:color="#FFFFFF" />
        </shape>
    </item>
    <item
        android:width="48dp"
        android:height="8dp"
        android:gravity="top|right">
        <shape android:shape="rectangle">
            <solid android:color="#FFFFFF" />
        </shape>
    </item>
    <item
        android:width="8dp"
        android:height="48dp"
        android:gravity="bottom|left">
        <shape android:shape="rectangle">
            <solid android:color="#FFFFFF" />
        </shape>
    </item>
    <item
        android:width="48dp"
        android:height="8dp"
        android:gravity="bottom|left">
        <shape android:shape="rectangle">
            <solid android:color="#FFFFFF" />
        </shape>
    </item>
    <item
        android:width="8dp"
        android:height="48dp"
        android:gravity="bottom|right">
        <shape android:shape="rectangle">
            <solid android:color="#FFFFFF" />
        </shape>
    </item>
    <item
        android:width="48dp"
        android:height="8dp"
        android:gravity="bottom|right">
        <shape android:shape="rectangle">
            <solid android:color="#FFFFFF" />
        </shape>
    </item>
</layer-list>