db.execSQL("delete from "+ TABLE_NAME);
db.delete("tablename","id=? and name=?",new String[]{"1","jack"});
/*Put this in your DAO or in your activity*/
public void delete(int yourvariable){ /*<-----Note: I used Int but you can use what variable you want*/
db.delete("yourtablename","yourcolumntodothewhere=" + yourvariable ,null);
}