Highlight Certain Text Background In Text View With Case Insensitive - android

I want to highlight certain text background with some color with case insensitive. I tried the code below but it's not working. It only highlights when the keyword is in lowercase.
private static CharSequence highlightText(String search, String originalText) {
if (search != null && !search.equalsIgnoreCase("")) {
String normalizedText = Normalizer.normalize(originalText, Normalizer.Form.NFD).replaceAll("\\p{InCombiningDiacriticalMarks}+", "").toLowerCase().;
int start = normalizedText.indexOf(search);
if (start < 0) {
return originalText;
} else {
Spannable highlighted = new SpannableString(originalText);
while (start >= 0) {
int spanStart = Math.min(start, originalText.length());
int spanEnd = Math.min(start + search.length(), originalText.length());
highlighted.setSpan(new BackgroundColorSpan(Color.YELLOW), spanStart, spanEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
start = normalizedText.indexOf(search, spanEnd);
}
return highlighted;
}
}
return originalText;
}
For example I have a original text = "I Love Stackoverflow" and the keyword is "i love". How can I highlight the text background of "i love" without changing it to lower case and maintain the case.
Thank you.


I got the answer from here:
Android: Coloring part of a string using TextView.setText()?
String notes = "aaa AAA xAaax abc aaA xxx";
SpannableStringBuilder sb = new SpannableStringBuilder(notes);
Pattern p = Pattern.compile("aaa", Pattern.CASE_INSENSITIVE);
Matcher m = p.matcher(notes);
while (m.find()){
//String word = m.group();
//String word1 = notes.substring(m.start(), m.end());
sb.setSpan(new BackgroundColorSpan(Color.YELLOW), m.start(), m.end(), Spannable.SPAN_INCLUSIVE_INCLUSIVE);
}
editText.setText(sb);


As an update Mei Yi's answer:
If you set a layout attribute on the TextView such as android:textAllCaps="true" it may overwrite the Spannable string used to set the highlight and look like it isn't working. That is easy to work around; just set the layout attributes programmatically.
Ex. textView.setText(text.toUpperCase()) instead of android:textAllCaps="true"


This will solve your issue
String text = "I Love StackOverflow";
String hilyt = "i love";
//to avoid issues ahead make sure your
// to be highlighted exists in de text
if( !(text.toLowerCase().contains(hilyt.toLowerCase())) )
return;
int x = text.toLowerCase().indexOf(hilyt.toLowerCase());
int y = x + hilyt.length();
Spannable span = new SpannableString(text);
span.setSpan(new BackgroundColorSpan(Color.YELLOW), x, y, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
yourTextView.setText(span);
The secret is changing all cases of both strings to lower case while trying to get de position of our text to be highlighted.
I hope it will help someone.

Related

How to give specific colors to words using Spannable?

I have a TextView and contains the below text
The -[[community]]- is here to help you with -[[specific]]- coding, -[[algorithm]]-, or -[[language]]- problems.
I want anything inside -[[]]- take red color, How can I do that using Spannable?
And I don't want to show -[[ and ]]- in TextView

You can use SpannableStringBuilder and append parts of String colorizing them when necessary. For example,
static CharSequence colorize(
String input, String open, String close, #ColorInt int color
) {
SpannableStringBuilder builder = new SpannableStringBuilder();
int openLen = open.length(), closeLen = close.length();
int openAt, contentAt, closeAt, last = 0;
while ((openAt = input.indexOf(open, last)) >= 0 &&
(closeAt = input
.indexOf(close, contentAt = openAt + openLen)) >= 0) {
int start = builder.append(input, last, openAt).length();
int len = builder.append(input, contentAt, closeAt).length();
builder.setSpan(
new ForegroundColorSpan(color),
start, len, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE
);
last = closeAt + closeLen;
}
return builder.append(input, last, input.length());
}

You can use the CodeView library to highlight many patterns with different colors, in your case for example the code will be like this
CodeView codeView = findViewById(R.id.codeview);
codeView.addSyntaxPattern(Pattern.compile("-\\[\\[[a-zA-Z]+]]-"), Color.GREEN);
codeView.setTextHighlighted(text);
And the result will be:
If the highlighted keywords are unique you can highlight them without using -[[]]- just create a pattern that can cover them
You can change the color, add or remove patterns in the runtime
CodeView Repository URL: https://github.com/amrdeveloper/codeview

The value in the variable who named open must be different from the value in the variable who named close, If the value was the same will cause a problem. You need to change variables values only to work well.
String open = "-[[";
String close = "]]-";
int color = Color.RED;
String s1 = "The -[[community]]- is here to help you with -[[specific]]- coding, -[[algorithm]]-, or -[[language]]- problems.";
SpannableStringBuilder spannableStringBuilder = new SpannableStringBuilder(s1);
while (spannableStringBuilder.toString().contains(open) && spannableStringBuilder.toString().contains(close)) {
spannableStringBuilder.setSpan(new ForegroundColorSpan(color), spannableStringBuilder.toString().indexOf(open) + open.length(), spannableStringBuilder.toString().indexOf(close) + close.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
spannableStringBuilder.replace(spannableStringBuilder.toString().indexOf(open), spannableStringBuilder.toString().indexOf(open) + open.length(), "").replace(spannableStringBuilder.toString().indexOf(close), spannableStringBuilder.toString().indexOf(close) + close.length(), "");
}
yourTextView.setText(spannableStringBuilder);

How to remove current typeface for some lines only [duplicate]

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.

Just build your String in HTML and set it:
String sourceString = "<b>" + id + "</b> " + name;
mytextview.setText(Html.fromHtml(sourceString));

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);

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.

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() > 0 && !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 < 0 || endingIndex <0){
return builder.append(text);
}
else if(startingIndex >= 0 && endingIndex >=0){
builder.append(text);
builder.setSpan(new StyleSpan(Typeface.BOLD), startingIndex, endingIndex, 0);
}
}else{
return builder.append(text);
}
return builder;
}

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);

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)
<string name="test">
<![CDATA[
<b>bold!</b> normal
]]>
</string>
layout file
<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">
<TextView
android:id="#+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_gravity="center" />
</FrameLayout>
code
textView.text = HtmlCompat.fromHtml(getString(R.string.test), HtmlCompat.FROM_HTML_MODE_LEGACY)

Its simple just close the specified text like this for example <b>"your text here:"</b>
<string name="headquarters">"<b>"Headquarters:"</b>" Mooresville, North Carolina, U.S.</string>
result:
Headquarters: Mooresville, North Carolina, U.S.

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

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:
<string name="welcome_messages">Hello, %1$s! You have <b>%2$d new messages</b>.</string>
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 >= 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.

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() > 0 && !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 >= 0 && endingIndex >= 0) {
builder.setSpan(new StyleSpan(Typeface.BOLD), startingIndex, endingIndex, 0);
}
}
}
return builder;
}

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 <b>bold</b> and <b>this</b> too";
textView.setText(makeSpannable(myText, "<b>(.+?)</b>", "<b>", "</b>"));
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;
}

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 < 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.

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())
}
}

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.<br> eg. I am BOLD.
* #param targetStringToFormat Target String value to format. <br>eg. BOLD
* #param matchCase Match by target character case or not. If true, BOLD != bold
* #return A string with a portion formatted in BOLD. <br> I am <b>BOLD</b>.
*/
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!

I used this code to bold specific words...
Spanned string = Html.fromHtml("Normal string <b>BOLD STRING</b>");
textView.setText(string);

Isn't this code the easiest solution?
<string name="string">Please provide your <b>Name</b> properly</string>
Just use this string whatever you want :)
The result will like this:
Please provide your Name properly

public static Spanned getBoldString(String textNotBoldFirst, String textToBold, String textNotBoldLast) {
String resultant = null;
resultant = textNotBoldFirst + " " + "<b>" + textToBold + "</b>" + " " + textNotBoldLast;
return Html.fromHtml(resultant);
}
Try this. It can help definitely

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() > 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;
}

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)

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<String, Int>) {
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 >= 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
)
)

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.

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)

Your String resource
<resources>
<string name="your_string_resource_name">This is normal text<![CDATA[<b> but this is bold </b>]]> and <![CDATA[<u> but this is underline text</u>]]></string>
</resources>
your java class
yourtextView.setText(getString(R.string.your_string_resource_name));

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() && contentData.length() > 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() && contentData.length() > 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);
}
}

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
<string name="bold_text"><![CDATA[Part of text is <b>bold</b>]]></string>

Simple Example
In you strings.xml
<string name="str_privacy_policy">This is our Privacy Policy.</string>
if you want to make specifically "Privacy Policy" as bold put the string between the bold tags.
Like this
<string name="str_privacy_policy">This is our <b>Privacy Policy.</b></string>
Result would be
This is our Privacy Policy

Here's how I do it using regular expressions and Kotlin
val BOLD_SPAN = StyleSpan(Typeface.BOLD)
fun TextView.boldMatches(regexString: String) {
this.applyStyleSpanToMatches(regexString, BOLD_SPAN)
}
fun TextView.applyStyleSpanToMatches(regexString: String, span: StyleSpan){
this.text = this.text.toString().applyStyleSpanToMatches(regexString, span)
}
fun String.applyStyleSpanToMatches(regexString: String, span: StyleSpan): Spannable {
val result = SpannableString.valueOf(this)
if(regexString.isEmpty()) return result
val pattern = try{
Pattern.compile(regexString)
} catch (e: PatternSyntaxException){
return result
}
val matcher = pattern.matcher(result)
while (matcher.find()) {
val start = matcher.start()
val end = matcher.end()
result.setSpan(span, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
}
return result
}
using the question
it can be applied like this:
txtResult.boldMatches(id)

If you are using Kotlin and string resources, a simple solution is:
Create your string on strings.xml, using <b> </b> to bold the parts you want
<string name="my_message"> This is a very <b>important</b> message! </string>
On Kotlin code you must do like so
textView.setText(R.string.my_message)
And that is it!
Important note!
Using property syntax will not work:
textView.text = resources.getString(R.string.my_message)
Hope it helps!

val phone = "+45xxxxxx"
val phoneText = "<font color=#757B7F><b>${phone}</b></font>"
val wholeString = requireActivity().resources.getString(R.string.loginwith)+" "+phoneText

Just add this in your tag
dangerouslySetInnerHTML={{__html: "<p>Your html text here.<p>"}}

Bold/Normal states for Edittext

For my Edittext, I'm creating the option for the user to be able to set selected text to bold, but the user should also be able to "unbold" the same selected text again.
The functionality for this includes also italic, underline, stroke but will be added on later.
The code that makes the text bold works, but I have no clue about how to unbold the selected text or how to check for if the text is already bold.
CharacterStyle cs;
int start = editText.getSelectionStart();
int end = editText.getSelectionEnd();
SpannableStringBuilder ssb = new SpannableStringBuilder(editText.getText());
switch(item.getItemId()) {
case R.id.bold:
cs = new StyleSpan(Typeface.BOLD);
ssb.setSpan(cs, start, end, 1);
editText.setText(ssb);
return true;

SOLVED with this algorithm found on the web: https://code.google.com/archive/p/droid-writer/
int selectionStart = editText.getSelectionStart();
int selectionEnd = editText.getSelectionEnd();
if (selectionStart > selectionEnd) {
int temp = selectionEnd;
selectionEnd = selectionStart;
selectionStart = temp;
}
if (selectionEnd > selectionStart) {
Spannable str = editText.getText();
boolean exists = false;
StyleSpan[] styleSpans;
switch (item.getItemId()) {
case R.id.bold:
styleSpans = str.getSpans(selectionStart, selectionEnd, StyleSpan.class);
// If the selected text-part already has BOLD style on it, then
// we need to disable it
for (int i = 0; i < styleSpans.length; i++) {
if (styleSpans[i].getStyle() == android.graphics.Typeface.BOLD) {
str.removeSpan(styleSpans[i]);
exists = true;
}
}
// Else we set BOLD style on it
if (!exists) {
str.setSpan(new StyleSpan(android.graphics.Typeface.BOLD), selectionStart, selectionEnd,
Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
}
editText.setSelection(selectionStart, selectionEnd);
break;

Use accordingly, the codes below are more easier to implement than yours.
textView.setTypeface(null, Typeface.NORMAL);
textView.setTypeface(null, Typeface.BOLD_ITALIC);
textView.setTypeface(null, Typeface.BOLD);
textView.setTypeface(null, Typeface.ITALIC);
For setting specify text to bold, I found out that build your string using Html is much more easier. For example, if you want some text looks like this
1111 neil
You can do this using:
String sourceString = "<b>" + id + "</b> " + name;
mytextview.setText(Html.fromHtml(sourceString));

Set textColorLink on textAllCaps?

I have a textview that should be in all caps and mark any urls found in it with a specific color, so naturaly I've tried textColorLink, with the option textAllCaps="true", however the url is not colored, my guess is that the regex does not match uppercase urls, since the url is colored if the same text is in lowercase.
I've tried solving it with this:
Spannable formatted = new SpannableString(text);
Pattern url = Pattern.compile(
"(https?)://[-a-zA-Z0-9+&##/%?=~_|!:,.;]*[-a-zA-Z0-9+&##/%=~_|]");
Matcher matcher = url.matcher(text.toLowerCase());
while (matcher.find())
{
Log.e("TEST",matcher.group());
int begIndex = matcher.start();
int endIdx = begIndex + matcher.group().length() - 1;
Log.e("Found", String.valueOf(begIndex));
formatted.setSpan(new ForegroundColorSpan(
getResources().getColor(android.R.color.holo_red_light)),
begIndex, endIdx, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
mTextView.setText(formatted);
Apparently it finds the text, however once again it is not colored. I've been at this for hours, how do you solve this?

when you try to upperCase the string lose the color but if you add another SpannableString and pass to this the string.toUpperCase than you can setSpan...
SpannableString formatted = new SpannableString(urlString);
Pattern url = Pattern.compile("(https?)://[-a-zA-Z0-9+&##/%?=~_|!:,.;]*[-a-zA-Z0-9+&##/%=~_|]");
Matcher matcher = url.matcher(urlString.toLowerCase());
//Here you save the string in upper case
SpannableString stringUpperCase = new SpannableString(formatted.toString().toUpperCase());
while (matcher.find()) {
int begIndex = matcher.start();
int endIdx = begIndex + matcher.group().length() - 1;
stringUpperCase.setSpan(new ForegroundColorSpan(R.color.Red),
0, formatted.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
TextView text = (TextView) findViewById(R.id.textView);
text.setText(string);
Should works...
Remove from xml the textAllCaps="true"

how to make a specific text on TextView BOLD

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.

Just build your String in HTML and set it:
String sourceString = "<b>" + id + "</b> " + name;
mytextview.setText(Html.fromHtml(sourceString));

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);

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.

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() > 0 && !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 < 0 || endingIndex <0){
return builder.append(text);
}
else if(startingIndex >= 0 && endingIndex >=0){
builder.append(text);
builder.setSpan(new StyleSpan(Typeface.BOLD), startingIndex, endingIndex, 0);
}
}else{
return builder.append(text);
}
return builder;
}

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);

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)
<string name="test">
<![CDATA[
<b>bold!</b> normal
]]>
</string>
layout file
<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">
<TextView
android:id="#+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_gravity="center" />
</FrameLayout>
code
textView.text = HtmlCompat.fromHtml(getString(R.string.test), HtmlCompat.FROM_HTML_MODE_LEGACY)

Its simple just close the specified text like this for example <b>"your text here:"</b>
<string name="headquarters">"<b>"Headquarters:"</b>" Mooresville, North Carolina, U.S.</string>
result:
Headquarters: Mooresville, North Carolina, U.S.

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

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:
<string name="welcome_messages">Hello, %1$s! You have <b>%2$d new messages</b>.</string>
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 >= 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.

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() > 0 && !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 >= 0 && endingIndex >= 0) {
builder.setSpan(new StyleSpan(Typeface.BOLD), startingIndex, endingIndex, 0);
}
}
}
return builder;
}

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 <b>bold</b> and <b>this</b> too";
textView.setText(makeSpannable(myText, "<b>(.+?)</b>", "<b>", "</b>"));
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;
}

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 < 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.

Isn't this code the easiest solution?
<string name="string">Please provide your <b>Name</b> properly</string>
Just use this string whatever you want :)
The result will like this:
Please provide your Name properly

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())
}
}

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.<br> eg. I am BOLD.
* #param targetStringToFormat Target String value to format. <br>eg. BOLD
* #param matchCase Match by target character case or not. If true, BOLD != bold
* #return A string with a portion formatted in BOLD. <br> I am <b>BOLD</b>.
*/
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!

I used this code to bold specific words...
Spanned string = Html.fromHtml("Normal string <b>BOLD STRING</b>");
textView.setText(string);

public static Spanned getBoldString(String textNotBoldFirst, String textToBold, String textNotBoldLast) {
String resultant = null;
resultant = textNotBoldFirst + " " + "<b>" + textToBold + "</b>" + " " + textNotBoldLast;
return Html.fromHtml(resultant);
}
Try this. It can help definitely

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() > 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;
}

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)

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<String, Int>) {
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 >= 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
)
)

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.

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)

Your String resource
<resources>
<string name="your_string_resource_name">This is normal text<![CDATA[<b> but this is bold </b>]]> and <![CDATA[<u> but this is underline text</u>]]></string>
</resources>
your java class
yourtextView.setText(getString(R.string.your_string_resource_name));

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() && contentData.length() > 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() && contentData.length() > 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);
}
}

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
<string name="bold_text"><![CDATA[Part of text is <b>bold</b>]]></string>

Simple Example
In you strings.xml
<string name="str_privacy_policy">This is our Privacy Policy.</string>
if you want to make specifically "Privacy Policy" as bold put the string between the bold tags.
Like this
<string name="str_privacy_policy">This is our <b>Privacy Policy.</b></string>
Result would be
This is our Privacy Policy

Here's how I do it using regular expressions and Kotlin
val BOLD_SPAN = StyleSpan(Typeface.BOLD)
fun TextView.boldMatches(regexString: String) {
this.applyStyleSpanToMatches(regexString, BOLD_SPAN)
}
fun TextView.applyStyleSpanToMatches(regexString: String, span: StyleSpan){
this.text = this.text.toString().applyStyleSpanToMatches(regexString, span)
}
fun String.applyStyleSpanToMatches(regexString: String, span: StyleSpan): Spannable {
val result = SpannableString.valueOf(this)
if(regexString.isEmpty()) return result
val pattern = try{
Pattern.compile(regexString)
} catch (e: PatternSyntaxException){
return result
}
val matcher = pattern.matcher(result)
while (matcher.find()) {
val start = matcher.start()
val end = matcher.end()
result.setSpan(span, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
}
return result
}
using the question
it can be applied like this:
txtResult.boldMatches(id)

If you are using Kotlin and string resources, a simple solution is:
Create your string on strings.xml, using <b> </b> to bold the parts you want
<string name="my_message"> This is a very <b>important</b> message! </string>
On Kotlin code you must do like so
textView.setText(R.string.my_message)
And that is it!
Important note!
Using property syntax will not work:
textView.text = resources.getString(R.string.my_message)
Hope it helps!

val phone = "+45xxxxxx"
val phoneText = "<font color=#757B7F><b>${phone}</b></font>"
val wholeString = requireActivity().resources.getString(R.string.loginwith)+" "+phoneText

Just add this in your tag
dangerouslySetInnerHTML={{__html: "<p>Your html text here.<p>"}}

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