简单记一下，以前没怎么用过。

EditText View的getText直接返回的就是 Editable

而 TextView则是getEditableText才返回 Editable。

还有就是注释所说,

* Replaces the specified range (<code>st&hellip;en</code>) of text in this
* Editable with a copy of the slice <code>start&hellip;end</code> from
* <code>source</code>. The destination slice may be empty, in which case
* the operation is an insertion, or the source slice may be empty,
* in which case the operation is a deletion.

replace 在 没有选中内容时 表现为 insert操作,

replace/insert 的String 参数 不能为空.

android.text
接口 Editable

所有超级接口：

Appendable, CharSequence, GetChars, Spannable, Spanned

所有已知实现类：

SpannableStringBuilder

public interface Editable                
                    extends CharSequence, GetChars, Spannable, Appendable                

This is the interface for text whose content and markup can be changed (as opposed to immutable text like Strings). If you make a DynamicLayout of an Editable, the layout will be reflowed as the text is changed.

嵌套类摘要
staticclass	Editable.Factory Factory used by TextView to create new Editables.

字段摘要

从接口 android.text.Spanned 继承的字段
SPAN_COMPOSING, SPAN_EXCLUSIVE_EXCLUSIVE, SPAN_EXCLUSIVE_INCLUSIVE, SPAN_INCLUSIVE_EXCLUSIVE, SPAN_INCLUSIVE_INCLUSIVE, SPAN_INTERMEDIATE, SPAN_MARK_MARK, SPAN_MARK_POINT, SPAN_PARAGRAPH, SPAN_POINT_MARK, SPAN_POINT_MARK_MASK, SPAN_POINT_POINT, SPAN_PRIORITY, SPAN_PRIORITY_SHIFT, SPAN_USER, SPAN_USER_SHIFT

方法摘要
Editable	append(chartext) Convenience for append(String.valueOf(text)).
Editable	append(CharSequencetext) Convenience for replace(length(), length(), text, 0, text.length())
Editable	append(CharSequencetext, intstart, intend) Convenience for replace(length(), length(), text, start, end)
void	clear() Convenience for replace(0, length(), "", 0, 0)
void	clearSpans() Removes all spans from the Editable, as if by calling Spannable.removeSpan(java.lang.Object) on each of them.
Editable	delete(intst, inten) Convenience for replace(st, en, "", 0, 0)
InputFilter[]	getFilters() Returns the array of input filters that are currently applied to changes to this Editable.
Editable	insert(intwhere, CharSequencetext) Convenience for replace(where, where, text, 0, text.length());
Editable	insert(intwhere, CharSequencetext, intstart, intend) Convenience for replace(where, where, text, start, end)
Editable	replace(intst, inten, CharSequencetext) Convenience for replace(st, en, text, 0, text.length())
Editable	replace(intst, inten, CharSequencesource, intstart, intend) Replaces the specified range (st…en) of text in this Editable with a copy of the slice start…end from source.
void	setFilters(InputFilter[]filters) Sets the series of filters that will be called in succession whenever the text of this Editable is changed, each of which has the opportunity to limit or transform the text that is being inserted.

从接口 android.text.GetChars 继承的方法
getChars

从接口 android.text.Spannable 继承的方法
removeSpan, setSpan

从接口 android.text.Spanned 继承的方法
getSpanEnd, getSpanFlags, getSpans, getSpanStart, nextSpanTransition

从接口 java.lang.CharSequence 继承的方法
charAt, length, subSequence, toString

方法详细信息

replace

Editable replace(intst,                 inten,                 CharSequencesource,                 intstart,                 intend)

Replaces the specified range ( st…en) of text in this Editable with a copy of the slice start…end from source. The destination slice may be empty, in which case the operation is an insertion, or the source slice may be empty, in which case the operation is a deletion.

Before the change is committed, each filter that was set with setFilters(android.text.InputFilter[]) is given the opportunity to modify the source text.

If source is Spanned, the spans from it are preserved into the Editable. Existing spans within the Editable that entirely cover the replaced range are retained, but any that were strictly within the range that was replaced are removed. As a special case, the cursor position is preserved even when the entire range where it is located is replaced.

返回：

a reference to this object.

replace

Editable replace(intst,                 inten,                 CharSequencetext)

Convenience for replace(st, en, text, 0, text.length())

另请参见：

replace(int, int, CharSequence, int, int)

insert

Editable insert(intwhere,                CharSequencetext,                intstart,                intend)

Convenience for replace(where, where, text, start, end)

另请参见：

replace(int, int, CharSequence, int, int)

insert

Editable insert(intwhere,                CharSequencetext)

Convenience for replace(where, where, text, 0, text.length());

另请参见：

replace(int, int, CharSequence, int, int)

delete

Editable delete(intst,                inten)

Convenience for replace(st, en, "", 0, 0)

另请参见：

replace(int, int, CharSequence, int, int)

append

Editable append(CharSequencetext)

Convenience for replace(length(), length(), text, 0, text.length())

指定者：

接口 Appendable 中的 append

参数：

text - the character sequence to append.

返回：

this Appendable.

另请参见：

replace(int, int, CharSequence, int, int)

append

Editable append(CharSequencetext,                intstart,                intend)

Convenience for replace(length(), length(), text, start, end)

指定者：

接口 Appendable 中的 append

参数：

text - the character sequence to append.

start - the first index of the subsequence of csq that is appended.

end - the last index of the subsequence of csq that is appended.

返回：

this Appendable.

另请参见：

replace(int, int, CharSequence, int, int)

append

Editable append(chartext)

Convenience for append(String.valueOf(text)).

指定者：

接口 Appendable 中的 append

参数：

text - the character to append.

返回：

this Appendable.

另请参见：

replace(int, int, CharSequence, int, int)

clear

void clear()

Convenience for replace(0, length(), "", 0, 0)

另请参见：

Note that this clears the text, not the spans; use {@link #clearSpans} if you need that.

clearSpans

void clearSpans()

Removes all spans from the Editable, as if by calling Spannable.removeSpan(java.lang.Object) on each of them.

setFilters

void setFilters(InputFilter[]filters)

Sets the series of filters that will be called in succession whenever the text of this Editable is changed, each of which has the opportunity to limit or transform the text that is being inserted.

getFilters

InputFilter[] getFilters()

Returns the array of input filters that are currently appliedto changes to this Editable.

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