原來(lái)我是這么寫(xiě)的

<shape xmlns="http://schemas.android.com/apk/res/android"
       shape="rectangle">

    <solid color="@color/black"/>

    <corners radius="10dp"/>

    <stroke
            width="3dp"
            color="#2E3135" />

</shape>

然后發(fā)現(xiàn)要這么寫(xiě)

<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle">

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

    <corners android:radius="10dp"/>

    <stroke
            android:width="3dp"
            android:color="#2E3135" />

</shape>