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Android - Cannot change textcolor from xml

I'm stuck with a very strange issue.
I can't change the TextColor of some TextViews around the app, neither with the android:textColor="" nor by setting a style. It only works if I change it at runtime. This problem appeared without any change related to the activity in question. The most strange thing is that in the Preview the colors are fine, but when I run it, the colors are always the same.
What might be overriding the textColor value set in the XML ?
Thx Anticipately
P.S:
Along all the App I can only change the color of the textHint

I had to remove all the N preview stuff from my sdk to make things normal again. Don't forget the cache too.
sdk/extras/android/m2repository/com/android/support/design|support-v-13|ect./24~

The syntax of xml line you wrote is wrong
instead of
android:setTextColor=""
use
android:textColor=""

You can change the Text Color in layout XML by using android:textColor
example:
android:textColor="#0E0E9A"
it overrides the style.xml
the only way to override your layout.xml is by code
example:
mEditText.setTextColor(Color.DKGRAY);

change the background of actionbar from java code as defined in the style.xml

i have set the theme as:
<application
........
android:theme="#style/Theme.Example" >
.......
.......
</application>
i have several fragment in one activity. in one of my fragment i have change the color of actionbar as:
((MainActivity)getActivity()).getSupportActionBar()
.setBackgroundDrawable(new ColorDrawable(bitmap1.getPixel(0, 0)));
this works fine. now, i want to change the actionbar as it defined in #style/Theme.Example while i am traveling to another fragment.
after googling for several times, i find out only how to change the color or backround drawable of actionbar. not how to get back to the default actionbar style as it is defined in the style.xml
any help or link would be too much helpful :) thank you.
if it is needed, i can provide the style.xml. i have created them from this actionbar style generator tool

oh my god, i have found the answer in 5 min after posting the questions. i have used this:
Drawable d = getResources().getDrawable(R.drawable.ab_background_textured_example);
((MainActivity)getActivity()).getSupportActionBar().setBackgroundDrawable(d);
if you are asking that what the hell is R.drawable.ab_background_textured_example is, then you need to read my question properly and check out the link. on that page i have downloaded the zip file which contains the graphics. in the res/drawable there is a xml which is named ab_background_textured_example. and this is the default background of my actionbar. cheer.
if anyone need know more about it, just comment bellow.

Changing colour for label in android

Can we change the colour of title in an Android application.
I want to change the colour of label which has contents Abc Supply Company.
This label is in Manifest file. Can we change the colour for this label.
Looking forward to your reply.
thanks.

I think you want to change color of Application Label that comes in every screen.If i am right then there is no solution
In this case you have use theme for activity in android manifest file like this to remove that label
android:theme="#android:style/Theme.Black.NoTitleBar.Fullscreen"
Then design you own custom Label in Layout and then you can do whatever you want to do.
Hope this help you :)

Solution for this is known as Custom Title bar in Android, check this article: http://coderzheaven.com/2011/06/custom-title-bar-in-android/

Of course you can do.
You need to get reference of your
Textview yourTextView = ( TextView ) findViewById( R.id.YOUR_TEXT_VIEW );
and then call the function setTextColor( YOUR COLOR );

what style/attr/drawable for inverse background?

I try to make a ExpandableListView where the group headers are drawn inverse. There is no problem with changing the text color, size etc. via XML. I even found out how to use the system defaults like
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
style="#android:style/TextAppearance.Medium.Inverse"
/>
But for the background color?! I don't understand why these styles don't include background color information?!
Of course I could use a direct color, but I look for good default background attributes or styles. Like "style/Background.For.TextAppearance.Medium.Inverse" ;-)
What would be a good solution? So that for the dark themed devices I get white/gray, and for the white themed I get black?
Or should I simply use R.color.background_light?
Greetings, Joerg
PS: First question here ;-) Thanx to all the people answering here the last months and years: You great people made it much more easier for me to find a re-entrance in programming after 12 years break ;-)

As you observe, the styles with "TextAppearance" in their name only affect the foreground text attributes of the view. They are appropriate for the android:textAppearance attribute. The styles with "Widget" in their names define all the UI properties and will work in a style attribute, but Android doesn't define a "Widget.TextView.Inverse" style.
When I wanted to display an console-like log as an inverse text view, I used the following XML:
<TextView
android:textAppearance="#style/TextAppearance.AppCompat.Small.Inverse"
android:background="?android:colorForeground"
... />
It uses the theme's foreground color as the background for the view. With a dark theme it displays dark text on white, and in a light theme it displays light text on black.

how to use image as a theme

I need to use perticular image as the theme for my most of the activities in my application...
please help me how to do this..

Basic idea is to define and apply the custom style of your Activities in Res files. Tutorial here.

if your using XML display there is a field background
#drawable/custom_dialog_background
or
android:background in the XML anchors
setBackgroundResource(int) in your code
http://developer.android.com/reference/android/view/View.html#attr_android:background