I have updated my question to make it more understandable and provided more info.
The image below is my current GUI which is an second an activity and I'm trying to edit the text color and the arrow icon color to black.
The actionbar in the GUI is generated by editing the AndroidManifest.xml and using the java method, onNavigationItemSelected(MenuItem item), which will bring me back to the parent activity when I click on the arrow icon
Inside the AndroidManifest.xml I have define the title, "Trip" and its parent activity name.
So is there a way to change the text and icon color?
Current GUI
XML for the GUI
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.android.iplanner.Trip.ActivityTrip">
<android.support.design.widget.FloatingActionButton
android:id="@+id/fabAddTrip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentEnd="true"
app:backgroundTint="@color/colorPrimary"
android:clickable="true"
app:srcCompat="@drawable/ic_add_black_24px" />
</RelativeLayout>
styles.xml
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
<style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>
<style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
<style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
</resources>
AndroidManifest.xml
<activity
android:name=".Trip.ActivityTrip"
android:label="Trip"
android:parentActivityName=".ActivityMain" />

This is a function which i used for setting toolbar