What is default color for text in textview?

You can save old color and then use it to restore the original value. Here is an example:

ColorStateList oldColors =  textView.getTextColors(); //save original colors
textView.setTextColor(Color.RED);
....
textView.setTextColor(oldColors);//restore original colors

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But in general default TextView text color is determined from current Theme applied to your Activity.

Actually the color TextView is:

android:textColor="@android:color/tab_indicator_text"

or

#808080