안드로이드 html - andeuloideu html

목차 Show

Nested classes
Public methods
Inherited methods
FROM_HTML_MODE_COMPACT
FROM_HTML_MODE_LEGACY
FROM_HTML_OPTION_USE_CSS_COLORS
FROM_HTML_SEPARATOR_LINE_BREAK_BLOCKQUOTE
FROM_HTML_SEPARATOR_LINE_BREAK_DIV
FROM_HTML_SEPARATOR_LINE_BREAK_HEADING
FROM_HTML_SEPARATOR_LINE_BREAK_LIST
FROM_HTML_SEPARATOR_LINE_BREAK_LIST_ITEM
FROM_HTML_SEPARATOR_LINE_BREAK_PARAGRAPH
TO_HTML_PARAGRAPH_LINES_CONSECUTIVE
TO_HTML_PARAGRAPH_LINES_INDIVIDUAL
Public methods

안드로이드 개발 Android WebView 로컬 HTML 파일 표현하는 방법

안드로이드에서 웹 페이지를 불러오고 싶다면 WebView 위젯을 사용해야 합니다. WebView 에 URL 을 넘겨서 해당 사이트를 호출하는 것이죠. 그런데 외부에서 호출한 웹 사이트가 아닌 앱이 가지고 있는 html 파일을 어떻게 하면 WebView 로 불러 올 수 있을까요? 오늘은 앱에 있는 Local html 을 파일을 불러와서 WebView 에 표현하는 방법을 알아 보겠습니다.

▼ 보통 WebView 를 이용해서 외부 사이트를 불러오고 싶다면 다음과 같이 입력합니다. loadUrl() 함수에 사이드 주소를 넘기는 것이죠. 아래 결과 화면에 제 블로그가 나타났네요.

WebView wv = (WebView)findViewById(R.id.wvlocal);
wv.loadUrl("http://mainia.tistory.com");

▼ 이번에는 앱 안에 html 파일을 만들어서 WebView 로 불러 오겠습니다. 보통 자바 소스가 아닌 Resources 파일들은 app/src/main/res 아래 drawable, layout, values 등의 폴더에 저장합니다. 그런데 html 파일을 포함한 그 외의 데이터들은 app/src/main/assets 에 저장하는 것이 관례입니다. html 파일은 assets/www 폴더에 저장합니다. 해당 폴더를 가리키는 소스상 URL 은 file:///android_asset/www입니다. 그러니까 실제 폴더는 assets 지만 소스상에서는 android_asset 가 되는 것이죠. 그럼 assets/www 폴더에 index.html 파일을 만들어서 화면에 표현할 소스를 입력합니다.

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=euc-kr" />
<title>제목</title>
</head>
<body>

<p>Hello World!</p>

</body>
</html>

▼ loadUrl() 함수에 사이트 주소 대신 file:///로 시작하는 문자열을 입력합니다. 앱 내부에 assets 폴더는 android_asset 로 접근할 수 있습니다.

▼ 그림은 위에서 만든 HTML 파일을 WebView 에 표현한 결과 입니다. 이상으로 로컬 html 파일을 WebView 에 표현하는 방법에 대해 알아 보았습니다.

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public class Html
extends Object

This class processes HTML strings into displayable styled text. Not all HTML tags are supported.

Summary

Nested classes
`interface`	`Html.ImageGetter` Retrieves images for HTML <img> tags.
`interface`	`Html.TagHandler` Is notified when HTML tags are encountered that the parser does not know how to interpret.

Constants
`int`	`FROM_HTML_MODE_COMPACT` Flags for `fromHtml(java.lang.String, int, android.text.Html.ImageGetter, android.text.Html.TagHandler)`: Separate block-level elements with line breaks (single newline character) in between.
`int`	`FROM_HTML_MODE_LEGACY` Flags for `fromHtml(java.lang.String, int, android.text.Html.ImageGetter, android.text.Html.TagHandler)`: Separate block-level elements with blank lines (two newline characters) in between.
`int`	`FROM_HTML_OPTION_USE_CSS_COLORS` Flag indicating that CSS color values should be used instead of those defined in `Color`.
`int`	`FROM_HTML_SEPARATOR_LINE_BREAK_BLOCKQUOTE` Flag indicating that texts inside <blockquote> elements will be separated from other texts with one newline character by default.
`int`	`FROM_HTML_SEPARATOR_LINE_BREAK_DIV` Flag indicating that texts inside <div> elements will be separated from other texts with one newline character by default.
`int`	`FROM_HTML_SEPARATOR_LINE_BREAK_HEADING` Flag indicating that texts inside <h2>~<h6> elements will be separated from other texts with one newline character by default.
`int`	`FROM_HTML_SEPARATOR_LINE_BREAK_LIST` Flag indicating that texts inside <ul> elements will be separated from other texts with one newline character by default.
`int`	`FROM_HTML_SEPARATOR_LINE_BREAK_LIST_ITEM` Flag indicating that texts inside <li> elements will be separated from other texts with one newline character by default.
`int`	`FROM_HTML_SEPARATOR_LINE_BREAK_PARAGRAPH` Flag indicating that texts inside <p> elements will be separated from other texts with one newline character by default.
`int`	`TO_HTML_PARAGRAPH_LINES_CONSECUTIVE` Option for `toHtml(android.text.Spanned, int)`: Wrap consecutive lines of text delimited by '\n' inside <p> elements.
`int`	`TO_HTML_PARAGRAPH_LINES_INDIVIDUAL` Option for `toHtml(android.text.Spanned, int)`: Wrap each line of text delimited by '\n' inside a <p> or a <li> element.

Public methods
`static String`	`escapeHtml(CharSequence text)` Returns an HTML escaped representation of the given plain text.
`static Spanned`	`fromHtml(String source, int flags)` Returns displayable styled text from the provided HTML string.
`static Spanned`	`fromHtml(String source, Html.ImageGetter imageGetter, Html.TagHandler tagHandler)` This method was deprecated in API level 24. use `fromHtml(java.lang.String, int, android.text.Html.ImageGetter, android.text.Html.TagHandler)` instead.
`static Spanned`	`fromHtml(String source, int flags, Html.ImageGetter imageGetter, Html.TagHandler tagHandler)` Returns displayable styled text from the provided HTML string.
`static Spanned`	`fromHtml(String source)` This method was deprecated in API level 24. use `fromHtml(java.lang.String, int)` instead.
`static String`	`toHtml(Spanned text, int option)` Returns an HTML representation of the provided Spanned text.
`static String`	`toHtml(Spanned text)` This method was deprecated in API level 24. use `toHtml(android.text.Spanned, int)` instead.

Inherited methods

From class java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

Constants

FROM_HTML_MODE_COMPACT

Added in API level 24

public static final int FROM_HTML_MODE_COMPACT

Flags for fromHtml(java.lang.String, int, android.text.Html.ImageGetter, android.text.Html.TagHandler): Separate block-level elements with line breaks (single newline character) in between. This inverts the Spanned to HTML string conversion done with the option TO_HTML_PARAGRAPH_LINES_INDIVIDUAL.

Constant Value: 63 (0x0000003f)

FROM_HTML_MODE_LEGACY

Added in API level 24

public static final int FROM_HTML_MODE_LEGACY

Flags for fromHtml(java.lang.String, int, android.text.Html.ImageGetter, android.text.Html.TagHandler): Separate block-level elements with blank lines (two newline characters) in between. This is the legacy behavior prior to N.

Constant Value: 0 (0x00000000)

FROM_HTML_OPTION_USE_CSS_COLORS

Added in API level 24

public static final int FROM_HTML_OPTION_USE_CSS_COLORS

Flag indicating that CSS color values should be used instead of those defined in Color.

Constant Value: 256 (0x00000100)

FROM_HTML_SEPARATOR_LINE_BREAK_BLOCKQUOTE

Added in API level 24

public static final int FROM_HTML_SEPARATOR_LINE_BREAK_BLOCKQUOTE

Flag indicating that texts inside <blockquote> elements will be separated from other texts with one newline character by default.

Constant Value: 32 (0x00000020)

FROM_HTML_SEPARATOR_LINE_BREAK_DIV

Added in API level 24

public static final int FROM_HTML_SEPARATOR_LINE_BREAK_DIV

Flag indicating that texts inside <div> elements will be separated from other texts with one newline character by default.

Constant Value: 16 (0x00000010)

FROM_HTML_SEPARATOR_LINE_BREAK_HEADING

Added in API level 24

public static final int FROM_HTML_SEPARATOR_LINE_BREAK_HEADING

Flag indicating that texts inside <h2>~<h6> elements will be separated from other texts with one newline character by default.

Constant Value: 2 (0x00000002)

FROM_HTML_SEPARATOR_LINE_BREAK_LIST

Added in API level 24

public static final int FROM_HTML_SEPARATOR_LINE_BREAK_LIST

Flag indicating that texts inside <ul> elements will be separated from other texts with one newline character by default.

Constant Value: 8 (0x00000008)

FROM_HTML_SEPARATOR_LINE_BREAK_LIST_ITEM

Added in API level 24

public static final int FROM_HTML_SEPARATOR_LINE_BREAK_LIST_ITEM

Flag indicating that texts inside <li> elements will be separated from other texts with one newline character by default.

Constant Value: 4 (0x00000004)

FROM_HTML_SEPARATOR_LINE_BREAK_PARAGRAPH

Added in API level 24

public static final int FROM_HTML_SEPARATOR_LINE_BREAK_PARAGRAPH

Flag indicating that texts inside <p> elements will be separated from other texts with one newline character by default.

Constant Value: 1 (0x00000001)

TO_HTML_PARAGRAPH_LINES_CONSECUTIVE

Added in API level 24

public static final int TO_HTML_PARAGRAPH_LINES_CONSECUTIVE

Option for toHtml(android.text.Spanned, int): Wrap consecutive lines of text delimited by '\n' inside <p> elements. BulletSpans are ignored.

Constant Value: 0 (0x00000000)

TO_HTML_PARAGRAPH_LINES_INDIVIDUAL

Added in API level 24

public static final int TO_HTML_PARAGRAPH_LINES_INDIVIDUAL

Option for toHtml(android.text.Spanned, int): Wrap each line of text delimited by '\n' inside a <p> or a <li> element. This allows ParagraphStyles attached to be encoded as CSS styles within the corresponding <p> or <li> element.

Constant Value: 1 (0x00000001)

Public methods

escapeHtml

Added in API level 16

public static String escapeHtml (CharSequence text)

Returns an HTML escaped representation of the given plain text.

Parameters
`text`	`CharSequence`

Returns
`String`

fromHtml

Added in API level 24

public static Spanned fromHtml (String source, 
                int flags)

Returns displayable styled text from the provided HTML string. Any <img> tags in the HTML will display as a generic replacement image which your program can then go through and replace with real images.

This uses TagSoup to handle real HTML, including all of the brokenness found in the wild.

Parameters
`source`	`String`
`flags`	`int`

Returns
`Spanned`

fromHtml

Added in API level 1
Deprecated in API level 24

public static Spanned fromHtml (String source, 
                Html.ImageGetter imageGetter, 
                Html.TagHandler tagHandler)

This method was deprecated in API level 24.
use fromHtml(java.lang.String, int, android.text.Html.ImageGetter, android.text.Html.TagHandler) instead.

Returns displayable styled text from the provided HTML string with the legacy flags FROM_HTML_MODE_LEGACY.

Parameters
`source`	`String`
`imageGetter`	`Html.ImageGetter`
`tagHandler`	`Html.TagHandler`

Returns
`Spanned`

fromHtml

Added in API level 24

public static Spanned fromHtml (String source, 
                int flags, 
                Html.ImageGetter imageGetter, 
                Html.TagHandler tagHandler)

Returns displayable styled text from the provided HTML string. Any <img> tags in the HTML will use the specified ImageGetter to request a representation of the image (use null if you don't want this) and the specified TagHandler to handle unknown tags (specify null if you don't want this).

This uses TagSoup to handle real HTML, including all of the brokenness found in the wild.

Parameters
`source`	`String`
`flags`	`int`
`imageGetter`	`Html.ImageGetter`
`tagHandler`	`Html.TagHandler`

Returns
`Spanned`

fromHtml

Added in API level 1
Deprecated in API level 24

public static Spanned fromHtml (String source)

This method was deprecated in API level 24.
use fromHtml(java.lang.String, int) instead.

Returns displayable styled text from the provided HTML string with the legacy flags FROM_HTML_MODE_LEGACY.

Parameters
`source`	`String`

Returns
`Spanned`

toHtml

Added in API level 24

public static String toHtml (Spanned text, 
                int option)

Returns an HTML representation of the provided Spanned text. A best effort is made to add HTML tags corresponding to spans. Also note that HTML metacharacters (such as "<" and "&") within the input text are escaped.

Parameters
`text`	`Spanned`: input text to convert
`option`	`int`: one of `TO_HTML_PARAGRAPH_LINES_CONSECUTIVE` or `TO_HTML_PARAGRAPH_LINES_INDIVIDUAL`

Returns
`String`	string containing input converted to HTML

toHtml

Added in API level 1
Deprecated in API level 24

public static String toHtml (Spanned text)

This method was deprecated in API level 24.
use toHtml(android.text.Spanned, int) instead.

Parameters
`text`	`Spanned`

Returns
`String`

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Last updated 2022-02-10 UTC.

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