Android：从我的应用程序发送包含附件的电子邮件时出

My application allows users to create and modify files. I would like them to be able to send a file as an email attachment. So, I need to first create and write to a temporary file, which I then attach to the email. And then I would like to delete the temporary file when the email program finishes. Unfortunately, the gmail app responds with a result code as soon as the user clicks "send"; and if I delete the file as soon as the result code is received, no attachment is sent. My application allows users to create and modif