Highlight search results in ListView
This what I use :
- Every occurence is replaced (not only prefix)
- Case and accent are ignored while searching but retained in the result.
- It uses directly
SpannableString
, which you can use insetText()
. I believe it's more efficient than using an intermediate html step.
.
public static CharSequence highlight(String search, String originalText) {
// ignore case and accents
// the same thing should have been done for the search text
String normalizedText = Normalizer.normalize(originalText, Normalizer.Form.NFD).replaceAll("\\p{InCombiningDiacriticalMarks}+", "").toLowerCase();
int start = normalizedText.indexOf(search);
if (start < 0) {
// not found, nothing to to
return originalText;
} else {
// highlight each appearance in the original text
// while searching in normalized text
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(<background_color>), spanStart, spanEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
start = normalizedText.indexOf(search, spanEnd);
}
return highlighted;
}
}
The accepted answer is nice. But you can do it by a single line of code. What I've done in my case to avoid the case sensitive issue is:
Spannable sb = new SpannableString(originalText);
sb.setSpan(new StyleSpan(android.graphics.Typeface.BOLD), originalText.toLowerCase().indexOf(query.toLowerCase()),
originalText.toLowerCase().indexOf(query.toLowerCase()) + query.length(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
result.setText(sb);
Hope it might help! Note: Here 'query' is the part of the string that you want to highlight.
Simple & Advanced Search Highlighting Example [Case Insensitive Order]
1. Simple Search (Html):
public static void setSearchTextHighlightSimpleHtml(TextView textView, String fullText, String searchText) {
try {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
fullText = fullText.replaceAll("(?i)(" + searchText + ")", "<span style=\"background-color:#FCFF48;\"><b><big><font color='#a10901'>$1</font></big></b></span>");
textView.setText(Html.fromHtml(fullText, Html.FROM_HTML_MODE_LEGACY), TextView.BufferType.SPANNABLE);
} else {
fullText = fullText.replaceAll("(?i)(" + searchText + ")", "<b><big><font color='red'>$1</font></big></b>");
textView.setText(Html.fromHtml(fullText), TextView.BufferType.SPANNABLE);
}
} catch (Exception e) {
textView.setText(fullText);
}
}
2. Simple Search (Spannable):
public static void setSearchTextHighlightSimpleSpannable(TextView textView, String fullText, String searchText) {
// highlight search text
if (null != searchText && !searchText.isEmpty()) {
SpannableStringBuilder wordSpan = new SpannableStringBuilder(fullText);
Pattern p = Pattern.compile(searchText, Pattern.CASE_INSENSITIVE);
Matcher m = p.matcher(fullText);
while (m.find()) {
int wordStart = m.start();
int wordEnd = m.end();
// Now highlight based on the word boundaries
ColorStateList redColor = new ColorStateList(new int[][]{new int[]{}}, new int[]{0xffa10901});
TextAppearanceSpan highlightSpan = new TextAppearanceSpan(null, Typeface.BOLD, -1, redColor, null);
wordSpan.setSpan(highlightSpan, wordStart, wordEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
wordSpan.setSpan(new BackgroundColorSpan(0xFFFCFF48), wordStart, wordEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
wordSpan.setSpan(new RelativeSizeSpan(1.25f), wordStart, wordEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
textView.setText(wordSpan, TextView.BufferType.SPANNABLE);
} else {
textView.setText(fullText);
}
}
3. Advanced Search (Spannable):
public static void setAdvancedSearch(TextView textView, String fullText, String searchText) {
if (searchText.length() == 0) {
textView.setText(fullText);
return;
}
final String searchBoundary = " \n()।.,;?-+!";
char[] boundaries = searchBoundary.toCharArray();
// highlight search text
if (isNotEquals(searchText, boundaries)) {
SpannableStringBuilder wordSpan = new SpannableStringBuilder(fullText);
Pattern p = Pattern.compile(searchText, Pattern.CASE_INSENSITIVE);
Matcher m = p.matcher(fullText);
while (m.find()) {
int wordStart = m.start();
while (wordStart >= 0 && isNotEquals(fullText.charAt(wordStart), boundaries)) {
--wordStart;
}
wordStart = wordStart + 1;
int wordEnd = m.end();
while (wordEnd < fullText.length() && isNotEquals(fullText.charAt(wordEnd), boundaries)) {
++wordEnd;
}
setWordSpan(wordSpan, wordStart, wordEnd);
}
textView.setText(wordSpan, TextView.BufferType.SPANNABLE);
} else {
textView.setText(fullText);
}
}
private static boolean isNotEquals(char charAt, char[] boundaries) {
return isNotEquals(String.valueOf(charAt), boundaries);
}
private static boolean isNotEquals(String searchText, char[] boundaries) {
for (char boundary : boundaries) {
boolean equals = searchText.equals(String.valueOf(boundary));
if (equals) return false;
}
return true;
}
private static void setWordSpan(SpannableStringBuilder wordSpan, int wordStart, int wordEnd) {
// Now highlight based on the word boundaries
ColorStateList redColor = new ColorStateList(new int[][]{new int[]{}}, new int[]{0xffa10901});
TextAppearanceSpan highlightSpan = new TextAppearanceSpan(null, Typeface.BOLD, -1, redColor, null);
wordSpan.setSpan(highlightSpan, wordStart, wordEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
wordSpan.setSpan(new BackgroundColorSpan(0xFFFCFF48), wordStart, wordEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
wordSpan.setSpan(new RelativeSizeSpan(1.25f), wordStart, wordEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}