Android - Change Actionbar Title Text Color

You could find how to customize ActionBar here. I recommend to use ToolBar and Theme.AppCompat instead - example.

Using SpannableString we can set Text Color of Actionbar title

SpannableString s = new SpannableString(title);
s.setSpan(new ForegroundColorSpan(Color.GREEN), 0, title.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
getSupportActionBar().setTitle(s);

<style name="AppTheme" parent="android:style/Theme.Holo.Light">

<style name="AppTheme.TextView" parent="android:Widget.TextView">

You missed a symbol "@" here?

<style name="MyTheme" parent="@android:style/Theme.Holo.Light">

also

<style name="AppTheme.TextView" parent="@android:Widget.TextView">