Android 带透明内框的圆形内角

Rounded Inner corners with transparent inside frame

提问by user606669

I am trying to make a frame from code so that I can apply it to make rounded inner corners with a solid fill outside and transparent inside. Just like a solid rectangle with transparent oval inside.picture attached. I have tried few shape combinations all that available online displays the corners outside.

我正在尝试用代码制作一个框架，以便我可以应用它来制作圆形的内角，外面是实心填充，里面是透明的。就像一个实心矩形，里面有透明的椭圆形。附上图片。我尝试了几种形状组合，所有可用的在线显示在外面的角落。

The inside should be transparent not white. The image is taken from this postbut the solution presented here is not what I am looking for I dont want to use a 9 patch drawable but would like to be created in code.

里面应该是透明的而不是白色的。该图像取自这篇文章，但此处提供的解决方案不是我正在寻找的解决方案我不想使用 9 patch drawable 但希望在代码中创建。

Please valid answers only.

请仅提供有效答案。

回答by Nima K

create the following rounded_corner.xml:

创建以下 rounded_corner.xml：

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:bottom="-10dp"
        android:left="-10dp"
        android:right="-10dp"
        android:top="-10dp">
        <shape android:shape="rectangle">
            <stroke
                android:width="10dp"
                android:color="#ffffff" />
            <corners android:radius="20dp" />
        </shape>
    </item>
</layer-list>

add this below your imageView, which you want to apply the frame on it:

将此添加到您要在其上应用框架的 imageView 下方：

<View
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_alignBottom="@+id/my_image_view"
    android:layout_alignLeft="@id/my_image_view"
    android:layout_alignRight="@+id/my_image_view"
    android:layout_alignTop="@id/my_image_view"
    android:background="@drawable/rounded_corner" />

回答by Android Stack

First of all, create 3 xmllayoutin drawable folder:

首先，xmllayout在drawable文件夹中创建3个：

1. First: frame.xml
2. Second: frame_build.xml
3. Third: red.xml

1. 第一个： frame.xml
2. 第二个：frame_build.xml
3. 第三： red.xml

(You can change this name as you wish),

（您可以根据需要更改此名称），

frame.xml:

框架.xml：

<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:bottom="20dp" android:drawable="@drawable/red" android:top="-25dp" />
    <item android:bottom="15dp" android:drawable="@drawable/frame_build" android:top="5dp" android:left="-5dp" android:right="-5dp" />
</layer-list>

frame_build.xml :

frame_build.xml :

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
    <padding android:left="10dp" android:top="10dp" android:right="10dp" android:bottom="10dp" />
    <corners android:radius="40dp" />
</shape>

red.xml

红色文件

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
    <stroke android:width="40dp" android:height="40dp" android:color="#B22222" />
    <padding android:left="8dp" android:top="-1dp" android:right="8dp" android:bottom="9dp" />
    <corners android:radius="-10dp" />
</shape>

Finally refer your view or layout to Frame XML as follow :

最后将您的视图或布局引用到 Frame XML，如下所示：

  android:background="@drawable/frame"

This tested and output as below image:

这经过测试并输出如下图：

Hope this help .

希望这有帮助。

回答by Zain

tweaking @Nima K solution, to avoid using an extra View

调整@Nima K 解决方案，以避免使用额外的视图

create frame.xml @ drawable

创建 frame.xml @ drawable

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

    <item
        android:bottom="-10dp"
        android:left="-10dp"
        android:right="-10dp"
        android:top="-10dp">
        <shape android:shape="rectangle">
            <stroke
                android:width="20dp"
                android:color="@color/frame_color" />
            <corners android:radius="30dp" />
        </shape>
    </item>

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

            <stroke
                android:width="20dp"
                android:color="@color/frame_color" />

            <corners android:radius="40dp" />
        </shape>

    </item>

</layer-list>

Then use it with 'android:background' attribute of your view

然后将它与视图的 'android:background' 属性一起使用

<TextView
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/frame" />

And this is the result

这就是结果