just try this one,
first create one XML file, inside drawable folder (use new drawable xml) and add this lines
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle"/>
<solid android:color="#000000"/>
<stroke
android:color="#ffffff"
android:width="05dp"/>
<corners android:radius="20dp"/>
then add this line inside Your edittext property
android:background="@drawable/(file_name)"
i don’t know what your expecting, maybe it will help you
solved How to put a border in an EditText? [duplicate]