It’s very easy to send email via an Android intent. Here’s an example where we already have the subject and body prepared but want to let the user decide on the recipient:
final Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
emailIntent.setType("text/plain");
emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, subject);
emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, body);
startActivity(Intent.createChooser(emailIntent, "Email:"));
(It’s important to note that this should be attempted on a real device.)