SpannableString for Android development and android Development

SpannableString for Android development and android Development

In the actual application development process, it is often encountered that different text parts display different font style information, such as text font, size, color, style, and hyperlink. In general, the text in TextView is a style. in similar cases, you can use the SpannableString or SpannableStringBuilder object to implement the above settings.

Both SpannableString and SpannableStringBuilder can set a text segment to a Span. In Android, Span represents the effect of a text segment, such as the link format, image, and background text. The difference is that SpannableStringBuilder can modify the text content.

Click it to get familiar with the SpannableString class.

Class Structure:

Extends Object
Implements GetChars Spannable CharSequence

Java. lang. Object
Bytes	Android. text. SpannableString

Class Overview:

The content of such text remains unchanged, but the marking object can be appended and separated. For variable text, seeSpannableStringBuilder.

Constructor:

Public Constructors
	SpannableString (CharSequence source)

 

Common public methods:

Public Methods
Final char	CharAt (int I) Returns the character at the specified index position. The index of the first character is 0.
Boolean	Equals (Object o) Compares this instance with the specified object and indicates if they are equal. Compare this instance with the specified object. If it is equal, true is returned.
Final void	GetChars (int start, int end, char [] dest, int off) Similar to the String. getChars () method: copy characters from the specified character array. Start position, end position, and off offset.
Int	GetSpanEnd (Object what) Obtain the end position of what object in the SpannableString object. If no match exists,-1 is returned.
Int	GetSpanStart (Object what) Obtain the starting position of what object in the SpannableString object. If no match exists,-1 is returned.
Final int	Length () Returns the number of characters in the sequence.
Void	RemoveSpan (Object what) Deletes a specified object from the text range.
Void	SetSpan (Object what, int start, int end, int flags) Sets a Span object. What

Note:

Void setSpan (Object what, int start, int end, int flags)

Sets a Span object. The first parameter "what" indicates the effect of a piece of text. It can accept the following attributes:

Attribute name	Description
BackgroundColorSpan	Background Color
ClickableSpan	Clickable text with click events
ForegroundColorSpan	Text color (foreground color)
MaskFilterSpan	Blur (BlurMaskFilter) embossed (EmbossMaskFilter)
MetricAffectingSpan	Parent class, generally not used
RasterizerSpan	Grating effect
StrikethroughSpan	Strikethrough (hyphen)
SuggestionSpan	Equivalent to a placeholder
UnderlineSpan	Underline
AbsoluteSizeSpan	Absolute size (text font)
DynamicDrawableSpan	Set the image to align based on the text baseline or bottom.
ImageSpan	Image
RelativeSizeSpan	Relative size (text font)
ReplacementSpan	Parent class, generally not used
ScaleXSpan	Zooming based on X axis
StyleSpan	Font Style: bold and italic
SubscriptSpan	Subscript (used in mathematical formulas)
SuperscriptSpan	Superscript (used in mathematical formulas)
TextAppearanceSpan	Text appearance (including font, size, style, and color)
TypefaceSpan	Text font
URLSpan	Text hyperlink

The second and third parameters indicate the start position and end position of a text segment to be set to Span, namely start and end. The last parameter (flags) is a flag. You can also set the following values:

Spanned. SPAN_EXCLUSIVE_INCLUSIVE: The Span effect is not applied to the characters entered before the Span, and the Span effect is applied to the characters entered later.

Spanned. SPAN_INCLUSIVE_EXCLUSIVE: Apply the Span effect to the character entered before the Span, and do not apply the Span effect to the character entered after the Span.

Spanned. SPAN_INCUJSIVE_INCLUSIVE: Apply the Span effect to all the characters entered before and after the Span.

Application instance:

For details about SpannableString, refer to TextView advanced application for Android development.

Android Application Development details: what is written in this book? Which android sdk version is used in the book?

I have read that it is a very easy-to-understand book for beginners. The basic plug-in usage methods and various functions are well described and recommended.

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