Android: problem sending email with attachment from my application

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 s开发者_开发百科oon as the user clicks "send"; and if I delete the file as soon as the result code is received, no attachment is sent.

Its possible that something else is going wrong and the attachment is not sent for a different reason, but I'm pretty sure my assessment is correct because the below code works properly if I comment out the mEmailTmpFile.delete() call. It also works fine if I do something very undesirable like Thread.sleep(4000) immediately prior to mEmailTmpFile.delete().

Is there anyway to be notified when the email is done sending? Or any other suggestions for how I should work around this?

//send an email...

File externalStorage = Environment.getExternalStorageDirectory();
String sdcardPath = externalStorage.getAbsolutePath();
mEmailTmpFile = new File(sdcardPath + "/" +  name );

//do some other to ensure unqiueness and then write to the file...

//all done writing, send email

Intent sendIntent = new Intent(Intent.ACTION_SEND);
sendIntent.setType("application/zip");
sendIntent.putExtra(Intent.EXTRA_SUBJECT, name);
sendIntent.putExtra(Intent.EXTRA_TEXT, "File attached.");
sendIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse("file://"+ mEmailTmpFile.getPath()));
startActivityForResult(Intent.createChooser(sendIntent, "Email"), REQUESTCODE_EMAIL);

public synchronized void onActivityResult(int reqCode, int resultCode, Intent data)
{
   if (reqCode == REQUESTCODE_EMAIL)
   {
    mEmailTmpFile.delete();
    }
}

In my apps, I don't delete the temporary file. Android will take care of it by deleting the file if it needs space. I would ensure that you don't create the tmp file in the SDCard root directory since that can look messy but other than that there shouldn't be a problem.