android button with half circle edges

问题

I am trying to create a shape to be used for my imagebuttons in my Android project that would essentially have half circles for the left and right sides.

I thought I could just use a shape XML with a radius, but that just rounds the corners where I need the whole left and right sides to be half circles like the image below.

My current XML for the shape looks like this:

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

    <corners
       android:radius="60dip"
         />

    <stroke
        android:width="0dp"
        android:color="#000000" />


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

</shape>

but I am trying to get this effect :

回答1:

How tall is your button? The shape drawable with rounded corners should work, you want the radius to be half of the height of the button.

回答2:

You must specify every corner radius like this:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="@color/green" />
    <size android:height="30dp" />
    <corners
        android:bottomRightRadius="15dp"
        android:bottomLeftRadius="15dp"
        android:topRightRadius="15dp"
        android:topLeftRadius="15dp"
        />
</shape>

You should not specify the width, so that it can adjust the width as background drawable.

来源：https://stackoverflow.com/questions/20954590/android-button-with-half-circle-edges