如何使用特定文本更改textview上的文本颜色？

TextView textView = findViewById(R.id.textView);

String fullText = "Hello World";
String targetText = "World";
int color = Color.RED;

SpannableString spannableString = new SpannableString(fullText);
ForegroundColorSpan colorSpan = new ForegroundColorSpan(color);
int startIndex = fullText.indexOf(targetText);
int endIndex = startIndex + targetText.length();
spannableString.setSpan(colorSpan, startIndex, endIndex, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

textView.setText(spannableString);