android - Which one is better in _ID and LOOKUP_KEY and the reason -

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i want search contact list particular contact using _id or lookup_key. 1 of these 2 better , reason. helpful if give main differences of both.

android doc says-

  1. _id - row id. consider using lookup_key instead.

  2. lookup_key - opaque value contains hints on how find contact if row id changed result of sync or aggregation.

so when in case contacts rowid change reason lookup_key our way go. check this link on how find not there on docs guess.


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