java怎么设置粗体和斜体,使Java中的电子邮件正文文本变为粗体，斜体和更大

I send an E-mail with data retrieved throughout my application like such:

String body = formatEmailBody();

Intent i = new Intent(Intent.ACTION_SEND);

i.setType("message/rfc822");

i.putExtra(Intent.EXTRA_EMAIL , new String[]{"recipient@example.com"}); // Set receipient here

i.putExtra(Intent.EXTRA_SUBJECT, "Subject");

i.putExtra(Intent.EXTRA_TEXT , body);

try {

startActivity(Intent.createChooser(i, "Send mail..."));

} catch (android.content.ActivityNotFoundException ex) {

Toast.makeText(MainActivity.this, "There are no email clients installed.", Toast.LENGTH_SHORT).show();

}

Where formatEmailBody simply creates a String to be send as body of my email.

But a simple string is boring, how may I add bold / italic / bigger text?</