Personalized Spinner on android

I have a drop-down in my application with a style. A part within a relative layout I put a EditText so that an arrow appears as if it were a drop-down, oriented to the right and that occupies the height of the drop-down presses the drop-down. Visually it looks good, the problem is that when you click on the arrow ( editText ) it does not unfold. I do not know if you can put some transparency at editText to detect what is below. or maybe an onClick in the Editext that deploys it.

Attached layout code.

<RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="59dp"
        android:layout_marginBottom="10dp">

        <Spinner
            android:id="@+id/spinnerMatricula"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:layout_marginLeft="20dp"
            android:layout_marginRight="20dp"
            android:layout_marginTop="10dp"
            android:background="@drawable/badge_circle_gris"
            android:elevation="2dp" />

        <TextView
            android:id="@+id/EtV"
            android:layout_width="34dp"
            android:layout_height="34dp"
            android:layout_alignEnd="@+id/spinnerMatricula"
            android:layout_alignRight="@+id/spinnerMatricula"
            android:layout_alignTop="@+id/spinnerMatricula"
            android:layout_marginBottom="10dp"
            android:background="@drawable/badge_circleflecha"
            android:backgroundTint="@color/fondos"
            android:elevation="3dp"
            android:gravity="center_vertical|fill_vertical|center_horizontal"
            android:inputType="textPersonName"
            android:paddingTop="0dp"
            android:text=" v "
            android:textColor="@color/blanco"
            android:textSize="15dp" />

    </RelativeLayout>

If you press in the middle it works perfectly.

Thank you.