Spannable WordToSpan = new SpannableString("Your message");      

WordToSpan.setSpan(new ForegroundColorSpan(Color.BLUE), 0, WordToSpan.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

Spannable WordToSpan1 = new SpannableString("Your new message");      

WordToSpan1.setSpan(new ForegroundColorSpan(Color.RED), 0, WordToSpan1.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);


//text.setText(tmp);
text.setText(WordToSpan);
text.append(WordToSpan1);