android - No such acos function exists

Question

I've a problem. I want to get the nearest points on google map in android app. Different points/coordinates are stored in sqlite database. And I have to get the nearest 5 from them. The Query I'm using is:

SELECT id, ( 3959 * acos( cos( radians(37) ) * cos( radians( lat ) ) * cos( radians( lng ) - radians(-122) ) + sin( radians(37) ) * sin( radians( lat ) ) ) ) AS distance FROM markers HAVING distance < 25 ORDER BY distance LIMIT 0 , 5;

But I'm getting an error i.e. "no such function: acos exists". What will be its proper solution

Answer 1

SQLite doesn't support any trigonometric functions by default, so you can't use them in SQL queries.

You can either fetch the list of coordinates and process it in application code, or you can try and expose Java's trigonometric functions in SQLite with user defined functions (see How can I create a user-defined function in SQLite?).