hightlighting a couple of words in textview

Question

I have a TextView with text and a Button that when i press highlight the word hello if it finds it in the text . working on a project in the android studio and I'm totally novice so if u can help point me in the right direction thx in advanced. for now, my app only highlight the word - hello

example : String textToHighlight = "hello";

How can I make it highlight the list of words from a file or database or just a simple line of code example : in the TextView there words " hello people i love u all " and I want to highlight hello and love

Android allows to display HTML in TextView, so maybe you can construct dynamic HTML and set it on your TextView. This is one link for your reference. https://stackoverflow.com/questions/2116162/how-to-display-html-in-textview — Alok Gupta, Feb 16 '19 at 09:55
Possible duplicate of [How to display HTML in TextView?](https://stackoverflow.com/questions/2116162/how-to-display-html-in-textview) — Reaz Murshed, Feb 16 '19 at 09:58

score 1 · Answer 1 · answered Feb 16 '19 at 10:06

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You probably want to use a SpannableString for this, which allows individual parts of a string to be rendered differently in a TextView.

Like so:

SpannableString str = new SpannableString("Highlighted. Not highlighted.");
str.setSpan(new BackgroundColorSpan(Color.YELLOW), 0, 11, 0);
textView.setText(str);

answered Feb 16 '19 at 10:06

Akash Pal

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Q : Using span is by numbers like from 0 to 5 to highlight a word – yan Feb 16 '19 at 11:40
yeah basically you put the color first then the start and end index which need to be hilighted – Akash Pal Feb 16 '19 at 11:42
yeah although you would have to do bit of calculation before using it as you need to find out which are the index that needed to be hilighted – Akash Pal Feb 16 '19 at 11:43
For now it's recognize the word hello by the word hello , there isn't other methods beside span – yan Feb 16 '19 at 12:12
yeah there is as you know textview can show the html tagged text so you could try and use that – Akash Pal Feb 16 '19 at 12:15
https://stackoverflow.com/questions/2116162/how-to-display-html-in-textview – Akash Pal Feb 16 '19 at 12:17

score 0 · Answer 2 · answered Feb 16 '19 at 11:19

0

you can work with Span's Span in android is the way to giving color-font-background-etc to the pic's of the text inside the textview family here is great article about Spans

https://blog.stylingandroid.com/introduction-to-spans/

answered Feb 16 '19 at 11:19

Amir Hossein Mirzaei

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I know it took long time for me but I am using span like u said , thx for that . – yan Mar 09 '19 at 14:15
Another Q , I have like 100 words to find in the textview What is faster to work with SQL or 100 lines of code for each word ? – yan Mar 10 '19 at 05:18
@yan in my opinion using sql database just for handling this operation is bad you can use Regex to search through your text – Amir Hossein Mirzaei Mar 10 '19 at 06:52
now i am using ssBuilder.setSpan( new ForegroundColorSpan(Color.RED), text.indexOf("hello"), text.indexOf("hello") + String.valueOf("hello").length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE ); and i have like 100 diffrenet words to find , how Regex can help – yan Mar 10 '19 at 18:13

hightlighting a couple of words in textview

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