Read Android Contacts and Edit it and export it as vcf in Android using java

Hi I am new in developing java application and I want to make application to edit phone numbers on contacts so I want to access android conta开发者_如何学编程cts and make backup and then edit its phone numbers .

I read some about it but not enough I put permissions in manifest file and

imported android.provider.Contacts

imported android.provider.ContactsContract;

but unfortunately I didn't know howa to read contacts from it as contact to export it as .vcf and edit in it ? So I need Help

Thanks

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Here is the link i was found to solve some of your problems.

Import/Export of Android contacts in vCard format