how do I highlight the searched text in my search filter?

Question

I am trying to do a search such that all the \"visible\" search letters should be highlighted. I tried using spannable but that didn\'t do the trick, maybe I wasnt doing it

Answer 1

In your filter method, store the string used to perform the filter:

// Filter Class
public void filter(String searchString) {
    this.searchString = searchString;
    ...
    // Filtering stuff as normal.
}

You must declare a member string to store it:

public class ListViewAdapter extends BaseAdapter {
    ...    
    String searchString = "";
    ...

And, in getView you highlight the search term:

public View getView(final int position, View view, ViewGroup parent) {
    ...
    // Set the results into TextViews
    WorldPopulation item = worldpopulationlist.get(position);
    holder.rank.setText(item.getRank());
    holder.country.setText(item.getCountry());
    holder.population.setText(item.getPopulation());

    // Find charText in wp
    String country = item.getCountry().toLowerCase(Locale.getDefault());
    if (country.contains(searchString)) {
        Log.e("test", country + " contains: " + searchString);
        int startPos = country.indexOf(searchString);
        int endPos = startPos + searchString.length();

        Spannable spanText = Spannable.Factory.getInstance().newSpannable(holder.country.getText()); // <- EDITED: Use the original string, as `country` has been converted to lowercase.
        spanText.setSpan(new ForegroundColorSpan(Color.RED), startPos, endPos, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

        holder.country.setText(spanText, TextView.BufferType.SPANNABLE);
    }
    ...
}

Hope it helps.