Android : How to add a line at the bottom of spinner as like edittext in android

Hello I am making demo application in which i am using EditText in which a line appears at the bottom that is ok but it is not in case of spinner.

How this is possible to do ?

layout.xml

<EditText
    android:id="@+id/twitterEditText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="15dp"
    android:hint="@string/twitter_account"
    android:inputType="textWebEmailAddress" />


<Spinner
    android:id="@+id/countrySpinner"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="15dp"
    android:hint="@string/country" />

<Spinner
    android:id="@+id/stateSpinner"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="15dp"
    android:hint="@string/state" />

<Spinner
    android:id="@+id/citySpinner"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="15dp"
    android:hint="@string/city" />