Spanned string loses bold style when adding characters

Question

I set the following text and style in my EditText:

SpannableStringBuilder sb = new SpannableStringBuilder();

sb.append("Hello");
sb.setSpan(new StyleSpan(Typeface.BOLD), 0, 5, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
sb.append("World Test");
et.setText(sb);

The result is this: "HelloWorld Test". This is fine. Now when I position the cursor after the "d" character (i.e. before the space that separates World and Test) and enter a character, the Hello automatically loses its bold style.

Why is that? That is confusing me. It only happens when positioning the cursor directly after the "d" in World and entering a character. For all other cursor positions it works as expected.

Why is that and how to fix it? I want Hello to stay in bold.

Answer 1

may be you should try this

SpannableStringBuilder sb = new SpannableStringBuilder();
int s = sb.length();
sb.append("Hello");
sb.setSpan(new ForegroundColorSpan(0xFFCC5500), s, 
sb.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

sb.setSpan(new StyleSpan(android.graphics.Typeface.BOLD), s, 
sb.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
sb.append("World Test");
et.setText(sb);

or try this after api 21

SpannableStringBuilder sb = new SpannableStringBuilder();
StyleSpan bold = new StyleSpan(android.graphics.Typeface.BOLD);
sb.append("Hello")
          .append("BOLD ", bold, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
          .append("World");

like html style try below

String str = "<b>" + "hello" + "</b> " + "World Test"; 
et.setText(Html.fromHtml(str));