Editable	This is the interface for text whose content and markup can be changed (as opposed to immutable text like Strings).
GetChars	Please implement this interface if your CharSequence has a getChars() method like the one in String that is faster than calling charAt() multiple times.
InputFilter	InputFilters can be attached to `Editable`s to constrain the changes that can be made to them.
InputType	Bit definitions for an integer defining the basic content type of text held in an `Editable` object.
NoCopySpan	This interface should be added to a span object that should not be copied into a new Spenned when performing a slice or copy operation on the original Spanned it was placed in.
Spannable	This is the interface for text to which markup objects can be attached and detached.
Spanned	This is the interface for text that has markup objects attached to ranges of it.
SpanWatcher	When an object of this type is attached to a Spannable, its methods will be called to notify it that other markup objects have been added, changed, or removed.
TextUtils.StringSplitter	An interface for splitting strings according to rules that are opaque to the user of this interface.
TextWatcher	When an object of a type is attached to an Editable, its methods will be called when the text is changed.

Editable.Factory	Factory used by TextView to create new Editables.
InputFilter.AllCaps	This filter will capitalize all the lower case letters that are added through edits.
InputFilter.LengthFilter	This filter will constrain edits not to make the length of the text greater than the specified length.
NoCopySpan.Concrete	Convenience equivalent for when you would just want a new Object() for a span but want it to be no-copy.
Selection	Utility class for manipulating cursors and selections in CharSequences.
Spannable.Factory	Factory used by TextView to create new Spannables.
SpannableString	This is the class for text whose content is immutable but to which markup objects can be attached and detached.
SpannableStringBuilder	This is the class for text whose content and markup can both be changed.
SpannedString	This is the class for text whose content and markup are immutable.
TextUtils
TextUtils.SimpleStringSplitter	A simple string splitter.

android.text