Try to add the next code inside your EditText
style="@style/Widget.AppCompat.EditText"
Check in real device.
In my EditText works, this is my EditText:
<EditText
    android:id="@+id/editTextFacebookID"
    style="@style/Widget.AppCompat.EditText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_centerVertical="true"
    android:layout_marginLeft="64dp"
    android:layout_marginRight="8dp"
    android:gravity="center_vertical"
    android:hint="Facebook ID"
    android:textColor="@color/md_text"                
    android:textColorHint="@color/md_disabled_hint_text" />
You can check md_text and md_disabled_hint_text colors here: Google Colors
And this is a v19 style of my app:
<style name="AppTheme" parent="Theme.AppCompat.NoActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/md_red_500</item>
    <item name="colorPrimaryDark">@color/md_red_700</item>
    <item name="colorAccent">@color/md_blue_A200</item>
    <item name="colorControlHighlight">@color/md_black_1000_25</item>
    <item name="colorControlNormal">@color/md_black_1000_50</item>
    <item name="colorSwitchThumbNormal">@color/md_grey_200</item>
    <item name="android:colorForeground">@color/md_black_1000_75</item>
    <item name="android:windowTranslucentNavigation">@bool/translucentNavigationBar</item>
    <item name="android:windowTranslucentStatus">@bool/translucentStatusBar</item>
    <!-- Navigation Drawer Arrow Style. -->
    <item name="drawerArrowStyle">@style/DrawerArrowStyle</item>
    <!-- Overflow Button Style. -->
    <item name="actionOverflowButtonStyle">@style/OverflowStyle</item>
</style>
My EditText is gray when is unfocused, and blue focused, it takes the color from colorAccent.
It changes color when I change the AppTheme.