Material Desing Textfield Dropdown How To Implement

I need to implement this component in my app: Just to reinforce that, what I need is a drop down in the text field, not a drop down in action bar. In the material design component

Solution 1:

I think this is what you are looking for.

<Spinner
                android:id="@+id/spPaymentType"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                style="@style/Widget.AppCompat.Spinner.Underlined"/>