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You can access the head and tail of a given list explicitly by using the List.hd and List.tl functions. Because the head of a list must be an element, calling List.hd on an empty list raises an exception. # List.hd (List.tl example_list);; - : int = 20 # List.hd [];; Exception: Failure "hd". Lists also can be reversed the reversed list is returned from the List.rev function. Although lists cannot be modified, the :: command also can be used to add an element to a list, returning a new list and leaving the old list unchanged. This command is also used in pattern matches to give the head and tail of a list, and this behavior is available only in pattern matches. # # 100 :: example_list;; : int list = [100; 10; 20; 30; 40; 50; 60; 70; 80; 90 ] List.rev example_list;; : int list = [90; 80; 70; 60; 50; 40; 30; 20; 10]

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ContentResolver is responsible for resolving the URI reference to the right provider and then passing on the ContentValues object to that specific provider.

There are three things that are significant in this implementation. The first one is the authority string. This is the same content provider identifying authority that we discussed in 3. This authority string needs to be unique and the same as its definition in the manifest file. (See the manifest file in Listing 14 16.) The code also initializes the parent class by calling the setupSuggestions() method. This method takes two arguments. One is the authority and the second is what is called a database mode. Let us talk about this database mode.

The key functionality of Android-supplied SearchRecentSuggestionsProvider is to store queries in the database so that they are available as future suggestions. A suggestion

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Although you can access specific elements of a list, you should not do it very often. If you need random access to the data in a list, you should probably use an array instead. If you try to access an element that is outside of the list bounds, a Failure exception is raised. val nth : 'a list -> int -> 'a # List.nth example_list 10;; Exception: Failure "nth". # List.nth example_list 5;; - : int = 60

has two text strings with it (see Figure 14 3). Only the first string is mandatory. As you use SearchRecentSuggestionsProvider to save these strings you need to tell it whether you want to store one string or two strings. To accommodate this, there are two modes supported by this base suggestion provider. Both modes use the following prefix:

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Here is an example of populating a single row of notes in ContentValues in preparation for an insert: ContentValues values = new ContentValues(); values.put("title", "New note"); values.put("note","This is a new note"); //values object is now ready to be inserted Although we have hard-coded the column names, you can use constants defined in your Notepad application instead. You can get a reference to ContentResolver by asking the Activity class: ContentResolver contentResolver = activity.getContentResolver(); Now all you need is a URI to tell ContentResolver to insert the row. These URIs are defined in a class corresponding to the Notes table. In the Notepad example, this URI is Notepad.Notes.CONTENT_URI We can take this URI and the ContentValues we have, and make a call to insert the row: Uri uri = contentResolver.insert(Notepad.Notes.CONTENT_URI, values); This call returns a URI pointing to the newly inserted record. This returned URI would match the following structure: Notepad.Notes.CONTENT_URI/new_id

DATABASE_MODE_...

Here are both modes:

Although lists cannot be modified in place, there are functions that will return a new list with added, concatenated, and flattened operations performed. The append function appends one list to the end of the other. The rev_append function appends the list to the reversed list and enjoys a performance advantage over the normal append function. The concat and flatten functions are essentially the same given a list of lists, they return one list with all the elements from the interior lists. Like all lists, all the elements in the lists must be the same type. val val val val append : 'a list -> 'a list -> 'a list rev_append : 'a list -> 'a list -> 'a list concat : 'a list list -> 'a list flatten : 'a list list -> 'a list

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