android studio circular image button
// drawable xml file
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval" >
<gradient
android:startColor="#FFFF0000"
android:endColor="#80FF00FF"
android:angle="270" />
</shape>
<!-------------------------------------------------->
// call in activity xml file
<ImageButton
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/name_shape_drawable" // drawable shape
/>