Html fromHtml deprecated in Android N

Question

I am using Html fromHtml to view html in a TextView   Spanned result   Html fromHtml mNews getTitle             mNewsTitle setText result     But Html fromHtml is now deprecated in Android N   What How do I find the new way of doing this

User · Answer

Here is my solution       if  Build VERSION SDK INT  gt   24            holder notificationTitle setText Html fromHtml notificationSucces getMessage    Html FROM HTML MODE LEGACY          else           holder notificationTitle setText Html fromHtml notificationSucces getMessage

User · Answer

update  as  Andy mentioned below  Google has created HtmlCompat which can be used instead of the method below  Add this dependency implementation  androidx core core 1 0 1  to the build gradle file of your app  Make sure you use the latest version of androidx core core   This allows you to use    HtmlCompat fromHtml html  HtmlCompat FROM HTML MODE LEGACY     You can read more about the different flags on the HtmlCompat-documentation  original answer  In Android N they introduced a new Html fromHtml method  Html fromHtml now requires an additional parameter  named flags  This flag gives you more control about how your HTML gets displayed    On Android N and above you should use this new method  The older method is deprecated and may be removed in the future Android versions    You can create your own Util-method which will use the old method on older versions and the newer method on Android N and above  If you don t add a version check your app will break on lower Android versions  You can use this method in your Util class     SuppressWarnings  deprecation   public static Spanned fromHtml String html       if html    null              return an empty spannable if the html is null         return new SpannableString           else if  Build VERSION SDK INT  gt   Build VERSION CODES N               FROM HTML MODE LEGACY is the behaviour that was used for versions below android N            we are using this flag to give a consistent behaviour         return Html fromHtml html  Html FROM HTML MODE LEGACY         else           return Html fromHtml html             You can convert the HTML FROM HTML MODE LEGACY into an additional parameter if you want  This gives you more control about it which flag to use    You can read more about the different flags on the  Html class documentation

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Compare of the flags of fromHtml      lt p style  color  blue   gt This is a paragraph with a style lt  p gt    lt h4 gt Heading H4 lt  h4 gt    lt ul gt      lt li style  color  yellow   gt         lt font color    FF8000   gt li orange element lt  font gt      lt  li gt      lt li gt li  2 element lt  li gt   lt  ul gt    lt blockquote gt This is a blockquote lt  blockquote gt   Text after blockquote Text before div   lt div gt This is a div lt  div gt   Text after div

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If you are lucky enough to develop on Kotlin   just create an extension function   fun String toSpanned    Spanned       if  Build VERSION SDK INT  gt   Build VERSION CODES N            return Html fromHtml this  Html FROM HTML MODE LEGACY        else            Suppress  DEPRECATION           return Html fromHtml this            And then it s so sweet to use it everywhere      yourTextView text   anyString toSpanned

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just make a function    public Spanned fromHtml String str     return Build VERSION SDK INT  gt   24   Html fromHtml str  Html FROM HTML MODE LEGACY    Html fromHtml str

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fromHtml     This method was deprecated in API level 24    You should use FROM HTML MODE LEGACY     Separate block-level elements with blank lines  two newline   characters  in between  This is the legacy behavior prior to N    Code  if  Build VERSION SDK INT  gt   24                        etOBJ setText Html fromHtml  Intellij  n Amiyo  Html FROM HTML MODE LEGACY                 else                      etOBJ setText Html fromHtml  Intellij  n Amiyo                 For Kotlin  fun setTextHTML html  String   Spanned               val result  Spanned   if  android os Build VERSION SDK INT  gt   android os Build VERSION CODES N                Html fromHtml html  Html FROM HTML MODE LEGACY            else               Html fromHtml html                    return result         Call   txt OBJ text    setTextHTML  IIT Amiyo

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Or you can use androidx core text HtmlCompat   HtmlCompat fromHtml   lt b gt HTML lt  b gt    HtmlCompat FROM HTML MODE LEGACY    HtmlCompat docs

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From official doc       fromHtml String  method was deprecated in API level 24  use fromHtml String  int    instead          TO HTML PARAGRAPH LINES CONSECUTIVE Option for toHtml Spanned  int   Wrap consecutive lines of text delimited by   n  inside  lt p gt    elements    TO HTML PARAGRAPH LINES INDIVIDUAL Option for toHtml Spanned  int   Wrap each line of text delimited by   n  inside a  lt p gt  or a  lt li gt    element       https   developer android com reference android text Html html

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Try the following to support basic html tags including ul ol li tags  Create a Tag handler as shown below  import org xml sax XMLReader   import android app Activity  import android os Bundle  import android text Editable  import android text Html  import android text Html TagHandler  import android util Log   public class MyTagHandler implements TagHandler       boolean first  true      String parent null      int index 1       Override     public void handleTag boolean opening  String tag  Editable output                            XMLReader xmlReader             if tag equals  ul    parent  ul           else if tag equals  ol    parent  ol           if tag equals  li                 if parent equals  ul                     if first                       output append   n t                           first  false                   else                      first   true                                              else                  if first                       output append   n t  index                            first  false                      index                     else                      first   true                                                      Set the text on Activity as shown below   SuppressWarnings  deprecation       public void init            try               TextView help    TextView  findViewById R id help               if  android os Build VERSION SDK INT  gt   android os Build VERSION CODES N                    help setText Html fromHtml getString R string help html  Html FROM HTML MODE LEGACY  null  new MyTagHandler                    else                   help setText Html fromHtml getString R string help html   null  new MyTagHandler                              catch  Exception e                e printStackTrace                       And html text on resource string files as     lt   CDATA     raw html data        gt

User · Answer

I had a lot of these warnings and I always use FROM HTML MODE LEGACY so I made a helper class called HtmlCompat containing the following       SuppressWarnings  deprecation      public static Spanned fromHtml String source            if  Build VERSION SDK INT  gt   Build VERSION CODES N                return Html fromHtml source  Html FROM HTML MODE LEGACY             else               return Html fromHtml source

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You can use     noinspection deprecation return Html fromHtml source     to suppress inspection just for single statement but not the whole method

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If you re using Kotlin  I achieved this by using a Kotlin extension   fun TextView htmlText text  String       if  Build VERSION SDK INT  gt   Build VERSION CODES N            setText Html fromHtml text  Html FROM HTML MODE LEGACY         else           setText Html fromHtml text             Then call it like   textView htmlText yourHtmlText

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The framework class has been modified to require a flag to inform fromHtml   how to process line breaks  This was added in Nougat  and only touches on the challenge of incompatibilities of this class across versions of Android   I ve published a compatibility library to standardize and backport the class and include more callbacks for elements and styling      https   github com Pixplicity HtmlCompat   While it is similar to the framework s Html class  some signature changes were required to allow more callbacks  Here s the sample from the GitHub page   Spanned fromHtml   HtmlCompat fromHtml context  source  0      You may want to provide an ImageGetter  TagHandler and SpanCallback    Spanned fromHtml   HtmlCompat fromHtml context  source  0            imageGetter  tagHandler  spanCallback   textView setMovementMethod LinkMovementMethod getInstance     textView setText fromHtml

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Just to extend the answer from  Rockney and  k2col the improved code can look like    NonNull public static Spanned fromHtml  NonNull String html        if  CompatUtils isApiNonLowerThan VERSION CODES N             return Html fromHtml html  Html FROM HTML MODE LEGACY         else             noinspection deprecation         return Html fromHtml html             Where the CompatUtils isApiNonLowerThan   public static boolean isApiNonLowerThan int versionCode        return Build VERSION SDK INT  gt   versionCode      The difference is that there are no extra local variable and the deprecation is only in else branch  So this will not suppress all method but single branch   It can help when the Google will decide in some future versions of Android to deprecate even the fromHtml String source  int flags  method

[android] Html.fromHtml deprecated in Android N

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