Intent.EXTRA_SUBJECT - Create a Subject Line of a Message

public static final String EXTRA_SUBJECT was added in API level 1
A constant string holding the desired subject line of a message. Constant Value: "android.intent.extra.SUBJECT"

1. Send Extended Data to an Intent to an intent named mySendIntent, with an activity action of ACTION_SEND, and a MIME type of "text/plain", with a putExtra name of Intent.EXTRA_SUBJECT and a value of "This is my subject."

2. Compile and run!

Previous Recommended Article: Intent.EXTRA_TEXT

Resources:
http://developer.android.com/reference/android/content/Intent.html#EXTRA_SUBJECT