How to execute select query in sqlite by android

I have write this code for select filtered data from sqlite db through android. But it says there are some error. Can you help me to correct my code please.

    category = data[0];
    district = data[1];

    SQLiteDatabase db = openOrCreateDatabase("dbumbers", 1, null);      

    Cursor c = db.rawQuery("SELECT * FROM numbers where [category = '"+category+"'] and [district = '"+district+"']", null);