check it , it may help you a lot.
You received this message because you are subscribed to the Google Groups "Android Security Discussions" group.
To unsubscribe from this group and stop receiving emails from it, send an email to firstname.lastname@example.org.
To post to this group, send email to email@example.com.
Visit this group at http://groups.google.com/group/android-security-discuss.
For more options, visit https://groups.google.com/groups/opt_out.