how to make a specific text on TextView BOLD

Question

I don t know how to make a specific text on TextView become BOLD   its like this  txtResult setText id     name     I want the output to be like this      1111 neil   id and name are variables that I have retrieved the value from database  and I want to make the id to bold  but only the id so the name will not affected  I have no idea how to do this

User · Answer

Found a way in case you want to handle localization in multiple languages, it's boring to do but it works, let's suppose we want this:

In English:

There are no payments registered

In Spanish:

No hay pagos registrados

You have to create 3 strings

English:

<string name="start_string">There are no</string>
<string name="middle_string">payments</string>
<string name="end_string">registered.</string>
<string name="string_format" translatable="false">%1$s %2$s %3$s</string>

Spanish:

<string name="start_string">No hay</string>
<string name="middle_string">pagos</string>
<string name="end_string">registrados</string>

Now you can do this:

val startSpanPosition = getString(R.string.start_string).length
val endSpanPosition = startSpanPosition + getString(R.string.middle_string).length
val mySpannableString = SpannableStringBuilder(String.format(getString(R.string.string_format),
        getString(R.string.start_string), getString(R.string.middle_string))), getString(R.string.end_string)))

mySpannableString.setSpan(StyleSpan(Typeface.BOLD), spanStartPosition, endSpanPosition, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)

User · Answer

This is the Kotlin extension function I use for this         Sets the specified Typeface Style on the first instance of the specified substring s      param one or more  Pair  of  String  and  Typeface  style  e g  BOLD  ITALIC  etc       fun TextView setSubstringTypeface vararg textsToStyle  Pair lt String  Int gt         val spannableString   SpannableString this text      for  textToStyle in textsToStyle            val startIndex   this text toString   indexOf textToStyle first          val endIndex   startIndex   textToStyle first length          if  startIndex  gt   0                spannableString setSpan                  StyleSpan textToStyle second                   startIndex                  endIndex                  Spannable SPAN EXCLUSIVE EXCLUSIVE                                   this setText spannableString  TextView BufferType SPANNABLE      Usage   text view text  something bold  text view setSubstringTypeface      Pair           something bold           Typeface BOLD              text view text  something bold something italic  text view setSubstringTypeface      Pair           something bold            Typeface BOLD            Pair           something italic           Typeface ITALIC

User · Answer

I used this code to bold specific words        Spanned string   Html fromHtml  quot Normal string  lt b gt BOLD STRING lt  b gt  quot        textView setText string

User · Answer

Here is better solution if you want to make multiple text to bold  I ve improved Eitan s code  thanks Eitan   public static SpannableStringBuilder makeSectionOfTextBold String text  String    textToBold        SpannableStringBuilder builder   new SpannableStringBuilder text        for  String textItem               textToBold            if  textItem length    gt  0  amp  amp   textItem trim   equals                      for counting start end indexes             String testText   text toLowerCase Locale US               String testTextToBold   textItem toLowerCase Locale US               int startingIndex   testText indexOf testTextToBold               int endingIndex   startingIndex   testTextToBold length                 if  startingIndex  gt   0  amp  amp  endingIndex  gt   0                    builder setSpan new StyleSpan Typeface BOLD   startingIndex  endingIndex  0                                      return builder

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Your String resource   lt resources gt      lt string name  your string resource name  gt This is normal text lt   CDATA  lt b gt  but this is bold  lt  b gt    gt  and  lt   CDATA  lt u gt  but this is underline text lt  u gt    gt  lt  string gt   lt  resources gt     your java class  yourtextView setText getString R string your string resource name

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Just build your String in HTML and set it   String sourceString     lt b gt     id     lt  b gt      name   mytextview setText Html fromHtml sourceString

User · Answer

Its simple just close the specified text like this   for example  lt b gt  your text here   lt  b gt    lt string name  headquarters  gt   lt b gt  Headquarters   lt  b gt   Mooresville  North Carolina  U S  lt  string gt    result  Headquarters  Mooresville  North Carolina  U S

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You can add the two strings separately in the builder  one of them is spannedString  the other is a regular one This way you don t have to calculate the indexes   val instructionPress   resources  getString R string settings press   val okText   resources  getString R string ok  val spannableString   SpannableString okText   val spannableBuilder   SpannableStringBuilder   spannableBuilder append instructionPress  spannableBuilder append spannableString  StyleSpan Typeface BOLD   Spannable SPAN EXCLUSIVE EXCLUSIVE   instructionText setText spannableBuilder TextView BufferType SPANNABLE

User · Answer

wtsang02 answer is the best way to go about it  since  Html fromHtml     is now deprecated  Here I m just going to enhance it a little bit for whoever is having problem in dynamically making the first word bold  no matter whats the size of the sentence    First lets create a method to get the first word    private String getFirstWord String input        for int i   0  i  lt  input length    i              if input charAt i                        return input substring 0  i                        return input      Now let s say you have a long string like this   String sentence    friendsAwesomeName gmail com want s to be your friend     And you want your sentence to be like yourAwesomeName gmail com want s to be your friend  All you have to do is- get the firstWord and get the lenght of it to make the firstWord bold  something like this   String myFirstWord   getFirstWord sentence   int start   0     bold will start at index 0 int end   myFirstWord length       and will finish at whatever the length of your first word   Now just follow wtsang02  s steps  like this   SpannableStringBuilder fancySentence   new SpannableStringBuilder sentence   fancySentence setSpan new android text style StyleSpan Typeface BOLD   start  end  Spannable SPAN EXCLUSIVE EXCLUSIVE   textView setText fancySentence     And that s it  Now you should be able to bold a word with any size from long short sentence  Hope it will help someone  happy coding

User · Answer

I came here to provide a more up-to-date solution  because I wasn t satisfied with the existing answers  I needed something that would work for translated texts and does not have the performance hit of using Html fromHtml    If you re using Kotlin  here is an extension function which will easily set multiple parts of your text to bold  This works just like Markdown  and could be extended to support other Markdown tags  if need be   val yourString      This   is your   string     makePartialTextsBold   val anotherString   getString R string something  makePartialTextsBold           This function requires that the parts of the string that need    to be bolded are wrapped in    and    tags     fun String makePartialTextsBold    SpannableStringBuilder       var copy   this     return SpannableStringBuilder   apply           var setSpan   true         var next  String         do               setSpan    setSpan             next   if  length    0  copy substringBefore           else copy substringBefore                   val start   length             append next              if  setSpan                    setSpan StyleSpan Typeface BOLD   start  length                          Spannable SPAN EXCLUSIVE EXCLUSIVE                            copy   copy removePrefix next  removePrefix                 while  copy isNotEmpty

User · Answer

Here is my complete solution for dynamic String values with case check          Makes a portion of String formatted in BOLD         param completeString       String from which a portion needs to be extracted and formatted  lt br gt  eg  I am BOLD      param targetStringToFormat Target String value to format   lt br gt eg  BOLD     param matchCase Match by target character case or not  If true  BOLD    bold     return A string with a portion formatted in BOLD   lt br gt  I am  lt b gt BOLD lt  b gt       public static SpannableStringBuilder formatAStringPortionInBold String completeString  String targetStringToFormat  boolean matchCase          Null complete string return empty     if  TextUtils isEmpty completeString             return new SpannableStringBuilder                 SpannableStringBuilder str   new SpannableStringBuilder completeString       int start index   0         if matchCase is true  match exact string     if  matchCase            if  TextUtils isEmpty targetStringToFormat      completeString contains targetStringToFormat                 return str                     start index   str toString   indexOf targetStringToFormat         else             else find in lower cases         if  TextUtils isEmpty targetStringToFormat      completeString toLowerCase   contains targetStringToFormat toLowerCase                   return str                     start index   str toString   toLowerCase   indexOf targetStringToFormat toLowerCase                int end index   start index   targetStringToFormat length        str setSpan new StyleSpan BOLD   start index  end index  Spannable SPAN EXCLUSIVE EXCLUSIVE       return str      Eg  completeString    I am BOLD   CASE I if  targetStringToFormat     bold  and  matchCase    true      returns   I am BOLD   since bold    BOLD    CASE II if  targetStringToFormat     bold  and  matchCase    false     returns   I am BOLD     To Apply   myTextView setText formatAStringPortionInBold  I am BOLD    bold   false     Hope that helps

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In case someone is using Data Binding  We can define binding adapter like this   BindingAdapter  html   fun setHtml view  TextView  html  String        view setText HtmlCompat fromHtml html  HtmlCompat FROM HTML MODE LEGACY       Then we can use it on a TextView  app html     string bold text     where bold text is    lt string name  bold text  gt  lt   CDATA Part of text is  lt b gt bold lt  b gt    gt  lt  string gt

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Make first char of string spannable while searching for char in list recycler like     ravi and ajay   previously highlighting like this but i wanted to be like below     ravi and ajay  OR  ravi and ajay   for this I searched for word length if it is equal to 1  I separated main string into words and calculated word start position then I searched word starting with char    public static SpannableString colorString int color  String text  String    wordsToColor        SpannableString coloredString   new SpannableString text        for  String word   wordsToColor             Log e  tokentoken    -wrd len-    word length             if  word length     1                int startColorIndex   text toLowerCase   indexOf word toLowerCase                 int endColorIndex   startColorIndex   word length                try                   coloredString setSpan new ForegroundColorSpan color   startColorIndex  endColorIndex                          Spannable SPAN EXCLUSIVE EXCLUSIVE                  catch  Exception e                    e getMessage                            else               int start   0               for  String token   text split    u00A0  n                       if  token length    gt  0                        start   text indexOf token  start                         Log e  tokentoken    -token-    token       --start--    start                       char x   token toLowerCase   charAt 0                       char w   word toLowerCase   charAt 0                         Log e  tokentoken    -w-    w       --x--    x                        if  x    w                               int startColorIndex   text toLowerCase   indexOf word toLowerCase                             int endColorIndex   start   word length                            try                               coloredString setSpan new ForegroundColorSpan color   start  endColorIndex                                      Spannable SPAN EXCLUSIVE EXCLUSIVE                              catch  Exception e                                e getMessage                                                                                                           return coloredString

User · Answer

I have created a static method for setting part of text Bold for TextView and EditText   public static void boldPartOfText View mView  String contentData  int startIndex  int endIndex           if  contentData isEmpty    amp  amp  contentData length    gt  endIndex                final SpannableStringBuilder sb   new SpannableStringBuilder contentData                final StyleSpan bss   new StyleSpan Typeface BOLD      Span to make text bold             final StyleSpan iss   new StyleSpan Typeface NORMAL     Span to make text normal             sb setSpan iss  0  startIndex  Spanned SPAN INCLUSIVE INCLUSIVE               sb setSpan bss  startIndex  endIndex  Spannable SPAN INCLUSIVE INCLUSIVE      make first 4 characters Bold             sb setSpan iss endIndex  contentData length  -1  Spanned SPAN INCLUSIVE INCLUSIVE                if mView instanceof TextView                   TextView  mView  setText sb               else if mView instanceof EditText                   EditText  mView  setText sb                      Another more customized code       typeFaceStyle can be passed as       Typeface NORMAL   0      Typeface BOLD   1      Typeface ITALIC   2      Typeface BOLD ITALIC   3         public static void boldPartOfText View mView  String contentData  int startIndex  int endIndex int typeFaceStyle           if  contentData isEmpty    amp  amp  contentData length    gt  endIndex                final SpannableStringBuilder sb   new SpannableStringBuilder contentData                final StyleSpan bss   new StyleSpan typeFaceStyle      Span to make text bold             final StyleSpan iss   new StyleSpan Typeface NORMAL     Span to make text italic             sb setSpan iss  0  startIndex  Spanned SPAN INCLUSIVE INCLUSIVE               sb setSpan bss  startIndex  endIndex  Spannable SPAN INCLUSIVE INCLUSIVE      make first 4 characters Bold             sb setSpan iss endIndex contentData length  -1 Spanned SPAN INCLUSIVE INCLUSIVE                if mView instanceof TextView                    TextView  mView  setText sb               else if mView instanceof EditText                    EditText  mView  setText sb

User · Answer

If you are using Kotlin  it becomes even easier to do by using core-ktx  as it provides a domain-specific-language  DSL  for doing this   val string  SpannedString   buildSpannedString       bold           append  foo             append  bar            More options provided by it are   append  Hello There   bold       append  bold       italic           append  bold and italic           underline               append  then some text with underline                       At last  you can just to   textView text   string

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In case you want to use the string from XML  you can do something like this   strings xml  the  CDATA  part is important  otherwise it won t work    lt string name  test  gt        lt   CDATA    lt b gt bold  lt  b gt  normal        gt   lt  string gt    layout file   lt FrameLayout     xmlns android  http   schemas android com apk res android  xmlns tools  http   schemas android com tools      android layout width  match parent  android layout height  match parent  tools context   MainActivity  gt        lt TextView         android id    id textView  android layout width  wrap content  android layout height  wrap content          android layout gravity  center    gt    lt  FrameLayout gt    code  textView text   HtmlCompat fromHtml getString R string test   HtmlCompat FROM HTML MODE LEGACY

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I thought that the chosen answer didn t provide a satisfactory result  I have written my own function which takes 2 strings  The full text and the part of the text you want to make bold   It returns a SpannableStringBuilder with the  textToBold  from  text  bolded   I find the ability to make a substring bold without wrapping it in tags useful                  Makes a substring of a string bold          param text          Full text         param textToBold    Text you want to make bold         return              String with bold substring              public static SpannableStringBuilder makeSectionOfTextBold String text  String textToBold            SpannableStringBuilder builder new SpannableStringBuilder             if textToBold length    gt  0  amp  amp   textToBold trim   equals                      for counting start end indexes             String testText   text toLowerCase Locale US               String testTextToBold   textToBold toLowerCase Locale US               int startingIndex   testText indexOf testTextToBold               int endingIndex   startingIndex   testTextToBold length                  for counting start end indexes              if startingIndex  lt  0    endingIndex  lt 0                   return builder append text                             else if startingIndex  gt   0  amp  amp  endingIndex  gt  0                    builder append text                   builder setSpan new StyleSpan Typeface BOLD   startingIndex  endingIndex  0                          else              return builder append text                      return builder

User · Answer

Based on  mladj0ni s answer  I got the code below to work  The problem was that if you use String format  it strips out the html markup  so you have to escape the bracket symbols in strings xml   strings xml    lt string name  welcome messages  gt Hello   1 s  You have  amp lt b gt  2 d new messages amp lt  b gt   lt  string gt   code java   String unspanned   String format Locale US    s s   getResources   getString R string  welcome messages   99    Spanned spanned  if  android os Build VERSION SDK INT  gt   android os Build VERSION CODES N        spanned   Html fromHtml unspanned  Html FROM HTML MODE LEGACY     else       spanned   Html fromHtml unspanned      textView setText spanned     It s simpler than SpannableStringBuilder  As for performance  if you re displaying just one string  then the user won t notice the extra millisecond to parse it   See the documentation here

User · Answer

if the position of bold text is fixed ex  if is at start of the textView   then use two different textView with same background  Then you can make the other textView s textStyle as bold   This will require twice the memory compared to a single textView but speed will increase

User · Answer

While you can use Html fromHtml   you can use a more native approach which is SpannableStringBuilder   this post may be helful   SpannableStringBuilder str   new SpannableStringBuilder  Your awesome text    str setSpan new android text style StyleSpan android graphics Typeface BOLD   INT START  INT END  Spannable SPAN EXCLUSIVE EXCLUSIVE   TextView tv new TextView context   tv setText str

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public static Spanned getBoldString String textNotBoldFirst  String textToBold  String textNotBoldLast        String resultant   null       resultant   textNotBoldFirst           lt b gt     textToBold     lt  b gt           textNotBoldLast       return Html fromHtml resultant        Try this  It can help definitely

User · Answer

First  You don t need to worry about using the slow performance code from the Raghav Sood s answer    Second  You don t need to write an extension function provided by w3bshark s answer when using Kotlin   Finnaly  All you need to do is to use the Kotlin android-ktx library from Google  refer here to find more information and how to include it on your project       Suppose id   1111 and name   neil  just what you want    val s   SpannableStringBuilder              bold   append id                append name  txtResult setText s        Produces  1111 neil     UPDATE   Because I think it can help someone else as well as to demonstrate how far you can go here are more use cases    When you need to display a text with some parts in blue and italic   val myCustomizedString   SpannableStringBuilder        color blueColor    append  A blue text            append  showing that         italic  append  it is painless      When you need to display a text in both bold and italic       bold   italic   append  Bold and italic          In short  bold  append  color and italic are extension functions to SpannableStringBuilder  You can see another extension functions in the official documentation  from where you can think for other possibilities

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Simple Example In you strings xml  lt string name  quot str privacy policy quot  gt This is our Privacy Policy  lt  string gt   if you want to make specifically  quot Privacy Policy quot  as bold put the string between the bold tags  Like this  lt string name  quot str privacy policy quot  gt This is our  lt b gt Privacy Policy  lt  b gt  lt  string gt   Result would be This is our Privacy Policy

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You can use this code to set part of your text to bold  For whatever is in between the bold html tags  it will make it bold   String myText    make this  lt b gt bold lt  b gt  and  lt b gt this lt  b gt  too   textView setText makeSpannable myText    lt b gt       lt  b gt      lt b gt      lt  b gt       public SpannableStringBuilder makeSpannable String text  String regex  String startTag  String endTag                 StringBuffer sb   new StringBuffer                SpannableStringBuilder spannable   new SpannableStringBuilder                 Pattern pattern   Pattern compile regex               Matcher matcher   pattern matcher text               while  matcher find                      sb setLength 0                   String group   matcher group                    String spanText   group substring startTag length    group length   - endTag length                     matcher appendReplacement sb  spanText                    spannable append sb toString                     int start   spannable length   - spanText length                     spannable setSpan new android text style StyleSpan android graphics Typeface BOLD   start  spannable length    Spannable SPAN EXCLUSIVE EXCLUSIVE                             sb setLength 0               matcher appendTail sb               spannable append sb toString                 return spannable

User · Answer

As wtsang02 said  using HTML is an expensive overhead  Just use the native solution  If you don t have to modify the string  just use SpannableString  not SpannableStringBuilder   String boldText    id   String normalText    name   SpannableString str   new SpannableString boldText   normalText   str setSpan new StyleSpan Typeface BOLD   0  boldText length    Spannable SPAN EXCLUSIVE EXCLUSIVE   textView setText str

[android] how to make a specific text on TextView BOLD

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