Border in shape xml

问题

I am trying to make a drawable to use for a button. I would like it to have this coloring, with a 2px border around it.

Everything works just fine except I cannot get the border to show up...

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

    <gradient android:startColor="@color/bar_clicked_dark"
        android:endColor="@color/bar_clicked_light"
        android:angle="90"/>

    <corners android:bottomLeftRadius="0dp"
        android:topLeftRadius="15dp"
        android:bottomRightRadius="15dp"
        android:topRightRadius="0dp" />

    <stroke android:width="2dp" 
        color="#ff00ffff" />

</shape>

回答1:

It looks like you forgot the prefix on the color attribute. Try

 <stroke android:width="2dp" android:color="#ff00ffff"/>

回答2:

If you want make a border in a shape xml. You need to use:

For the external border,you need to use:

<stroke/>

For the internal background,you need to use:

<solid/>

If you want to set corners,you need to use:

<corners/>

If you want a padding betwen border and the internal elements,you need to use:

<padding/>

Here is a shape xml example using the above items. It works for me

<shape xmlns:android="http://schemas.android.com/apk/res/android"> 
  <stroke android:width="2dp" android:color="#D0CFCC" /> 
  <solid android:color="#F8F7F5" /> 
  <corners android:radius="10dp" />
  <padding android:left="2dp" android:top="2dp" android:right="2dp" android:bottom="2dp" />
</shape>

回答3:

We can add drawable .xml like below

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


    <stroke
        android:width="1dp"
        android:color="@color/color_C4CDD5"/>

    <corners android:radius="8dp"/>

    <solid
        android:color="@color/color_white"/>

</shape>

来源：https://stackoverflow.com/questions/6698927/border-in-shape-xml