It's easy to add CodeView in your XML layout, notes that CodeView is based on AppCompatMultiAutoCompleteTextView, so you can easily customize it like any AutoCompleteTextView
<com.amrdeveloper.codeview.CodeView
android:id="@+id/codeView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/darkGrey"
android:dropDownWidth="@dimen/dimen150dp"
android:dropDownHorizontalOffset="0dp"
android:dropDownSelector="@color/darkGrey"
android:gravity="top|start" />