Border color on Android button
Use the <stroke> element. Add this xml file in res/drawable folder as button_border.xml:
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <gradient android:startColor="#FFFFFF" android:endColor="#00FF00" android:angle="270" /> <corners android:radius="3dp" /> <stroke android:width="5px" android:color="#ffffff" /> </shape>then call this by
<Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="10dp" android:background="@drawable/button_border" android:text="Button" />