How to delete all android contacts that start with a specific name? -

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i want delete contacts android phone starts "aaa" or contains "aaa" . here's tried:

private void deletecontact(string name) {          contentresolver cr = getcontentresolver();         string = contactscontract.data.display_name + " = ? ";         string[] params = new string[] {"aaaa"};          arraylist<contentprovideroperation> ops = new arraylist<contentprovideroperation>();         ops.add(contentprovideroperation.newdelete(contactscontract.rawcontacts.content_uri)                 .withselection(where, params)                 .build());         log.e(",,,,",string.valueof(ops.get(0)));         try {               cr.applybatch(contactscontract.authority, ops);         } catch (remoteexception e) {             // todo auto-generated catch block             e.printstacktrace();         } catch (operationapplicationexception e) {             // todo auto-generated catch block             e.printstacktrace();         }          toast.maketext(nativecontentprovider.this, "deleted contact name '" + name +"'", toast.length_short).show();      }

but failed. please give me idea can proceed further in project.

maybe on right track:

contentresolver mcontentresolver = getcontentresolver();     private int deletecontactslike(string name) {     return mcontentresolver.delete(             contactscontract.rawcontacts.content_uri,             contactscontract.contacts.display_name             + " ?",             new string[] { name + '%'});

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