[Android] Send/Receive Email In Code

1, Send Email
1.1, Send Text
    String[] mailto = { emailTo.getText().toString() };
    // Create a new Intent to send messages
    Intent sendIntent = new Intent(Intent.ACTION_SEND);
    // Add attributes to the intent
    sendIntent.putExtra(Intent.EXTRA_EMAIL, "Fill in target email address here!!!,eg:[e-mail]");
    sendIntent.putExtra(Intent.EXTRA_SUBJECT, "Fill in email subject here!!!");
    sendIntent.putExtra(Intent.EXTRA_TEXT, "Fill in email body here!!!");
    sendIntent.setType("text/plain");
    startActivity(Intent.createChooser(sendIntent, "MySendMail"))

1.2 Send Attachment
    Intent sendIntent = new Intent(Intent.ACTION_SEND);
    sendIntent.setType("audio/mp3");
    sendIntent.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/mysong.mp3");
    sendIntent.putExtra(Intent.EXTRA_SUBJECT, "Subject");
    startActivity(Intent.createChooser(sendIntent, "Title:"));