How to search for a word in a string and highlight word in a text view in android?

Question

in my android application i have a string that contains a specific word so i want to display whole string in text view and the specific word should be highlighted.Hope follo

Answer 1

for each word, you can use:

TextView textView = (TextView)findViewById(R.id.mytextview01);
//use a loop to change text color
Spannable WordtoSpan = new SpannableString("partial colored text");        
WordtoSpan.setSpan(new ForegroundColorSpan(Color.BLUE), 2, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(WordtoSpan);

Answer 2

If I can understand you have the list of words and you want to find this words in text and highlight them so in this answer you have three input parameter:

1. full text.
2. yourList

3. yourTextview to show the result text

   String text = "full of your text";
   Spannable textSpannable = new SpannableString(text);
   
   for (int j =0 ; j<yourList.size() ; j++) {
       //word of your list
       String word = String.valueOf(yourList.get(j));
       //find index of words
       for (int i = -1; (i = text.indexOf(word, i + 1)) != -1; i++) {
           //find the length of word for set color
           int last = i + word.length();
           //set text color with spannable
           textSpannable.setSpan(new BackgroundColorSpan(Color.parseColor("#0cab8f")),
                   i, last, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
       }
   }
   yourTextView.setText(textSpannable);
   

Answer 3

Just to make it simple, here I post my methode

. . . . . . . .

First getting ready to use the methode

    ArrayList<String> searchWords = new ArrayList<String>(Arrays.asList("Second", "Scottish", "forces", "England"));

    String text = "1333 – Second War of Scottish Independence: The Scottish-held town of Berwick-upon-Tweed surrendered to English forces, ending a siege led by Edward III of England (depicted).";


    TextView sampleTextView = new TextView(currentContext); // currentContext = getContext();

    if (searchWords != null) {
        Spannable newText = setSpanHighlight(text, searchWords);
        sampleTextView.setText(newText, TextView.BufferType.SPANNABLE);
    }
    else{
        sampleTextView.setText(text);
    }

The methode

    private Spannable setSpanHighlight(String text, @NonNull ArrayList<String> searchWord) {
    Spannable newText = new SpannableString(text);

    if (searchWord.size() != 0) {
        for (String word : searchWord){
            if (text.contains(word)){
                int beginIndex = text.indexOf(String.valueOf(word)); //Unnecessary 'String.valueOf()' call => if you have something else than String
                int endIndex = beginIndex + word.length();

                newText.setSpan(
                        new ForegroundColorSpan(Color.BLUE),
                        beginIndex,
                        endIndex,
                        Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
            }
        }
    }
    return newText;
}