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So we ve discussed how to interact with a content provider for our data needs, but haven t yet discussed how to write a content provider. To write a content provider, you have to extend android.content.ContentProvider and implement the following key methods: query insert update delete getType However, to make these methods work, you ll have to set up a number of things before implementing them. We will illustrate all the details of a content-provider implementation by describing the steps you ll need to take: 1. Plan your database, URIs, column names, and so on, and create a metadata class that defines constants for all of these metadata elements. 2. Extend the abstract class ContentProvider. 3. Implement these methods: query, insert, update, delete, and getType. 4. Register the provider in the manifest file.

As we have already pointed out, the implementation of a suggestion provider has two parts: the suggestion provider itself and a search activity that can respond to the suggestions produced by a suggestion provider. We have already described the suggestion provider implementation. We will cover the corresponding Search activity next. We will follow a track similar to the previous section. We will start by discussing the general responsibilities of a search activity. We will then present the complete source code to give you a bird s-eye view of how those responsibilities are fulfilled.

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# List.iter print_int example_list;; 102030405060708090- : unit = () # List.map string_of_int example_list;; - : string list = ["10"; "20"; "30"; "40"; "50"; "60"; "70"; "80"; "90"] # List.rev_map string_of_int example_list;; - : string list = ["90"; "80"; "70"; "60"; "50"; "40"; "30"; "20"; "10"] # List.fold_left (+) 0 example_list;; - : int = 450 # List.fold_right (+) example_list 0;; - : int = 450 The next two functions are interesting. The for_all function returns true if the given function evaluates as true for every element in the given list; otherwise, it is false. The exists function evaluates as true if one of the elements results in true in the given list. val for_all : ('a -> bool) -> 'a list -> bool val exists : ('a -> bool) -> 'a list -> bool # # List.for_all (fun x -> x > 0) example_list;; : bool = true List.exists (fun x -> x < 0) example_list;; : bool = false

A search activity is invoked by Android search with a query string. A search activity in turn needs to read this query string from the intent and do what is necessary. Because a search activity is an activity, it is possible that it can be invoked by other intents and other actions. For this reason, it is a good practice to check the intent action that invoked it. In our case, when the Android search invokes this activity this action is ACTION_SEARCH. Under some circumstances a search activity can invoke itself. When this is likely to happen, you should define the search activity launch mode as a singleTop. The activity will also need to deal with firing of onNewIntent(). We will cover this as well in the section Understanding onCreate and onNewIntent. When it comes to doing something with the query string, we will just log it. Once the query is logged we will need to save it in the SearchRecentSuggestionsProvider so that it is available as a suggestion for future searches. Now let us look at the source code of the search activity class.

To explore this topic, we ll create a database that contains a collection of books. The book database contains only one table called books, and its columns are name, isbn, and author. You ll define this sort of relevant metadata in a Java class. This metadata-bearing Java class BookProviderMetaData is shown in Listing 3-24. Some key elements of this metadata class are highlighted. Listing 3-24. Defining Metadata for Your Database: The BookProviderMetaData Class public class BookProviderMetaData { public static final String AUTHORITY = "com.androidbook.provider.BookProvider"; public static final String DATABASE_NAME = "book.db"; public static final int DATABASE_VERSION = 1; public static final String BOOKS_TABLE_NAME = "books"; private BookProviderMetaData() {}

Listing 14 17. SimpleSuggestionProvider Search Activity //filename: SearchActivity.java public class SearchActivity extends Activity { private final static String tag ="SearchActivity"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);

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