Intent.EXTRA_TEXT

public static final String EXTRA_TEXT was added in API level 1
A constant CharSequence that is associated with the Intent, used with ACTION_SEND to supply the literal data to be sent. Note that this may be a styled CharSequence, so you must use Bundle.getCharSequence() to retrieve it. Constant Value: "android.intent.extra.TEXT"

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 name of Intent.EXTRA_TEXT and a value of "This is my text to send."

2. Compile and run!

Next Recommended Article: Intent.EXTRA_SUBJECT - Create a Subject Line of a Message

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