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The iter function calls a function on each element of a given list The result of that function must be the unit type, which means that you cannot get information returned to you via iteration If you want information returned, you must use the map function, which maps a function onto each element in the list and returns a list of the results of each function call Almost all the OCaml collections have iter and map functions iter and map are also common expressions in functional programming languages The same is true of the fold functions, which for lists come in right-handed and lefthanded versions If this is the first time you ve seen fold operations, ensure that you understand them because they can be very powerful and confusing The fold_left function applies the given function to each element of the given list and to an initial argument.

So far we have talked about queries and inserts; updates and deletes are fairly straightforward. Performing an update is similar to performing an insert, in which changed column values are passed through a ContentValues object. Here is the signature of an update method on the ContentResolver object: int numberOfRowsUpdated = activity.getContentResolver().update( Uri uri, ContentValues values, String whereClause, String[] selectionArgs ) The whereClause argument will constrain the update to the pertinent rows. Similarly, the signature for the delete method is int numberOfRowsDeleted = activity.getContentResolver().update( Uri uri, String whereClause, String[] selectionArgs ) Clearly a delete method will not require the ContentValues argument because you will not need to specify the columns you want when you are deleting a record.

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TIP: You can learn more about this prefabricated suggestions provider at http://developer.android.com/reference/android/provider/SearchRecentSugg estions.html. Now that we have the source code for our simple suggestions provider let us see how we register this provider in the manifest file.

Because our SimpleSuggestionProvider is essentially a content provider it is registered in the manifest file like any other content provider. Listing 14 16 below shows the manifest file. Note that key sections of this file are highlighted.

The result and the initial argument must be the same type Consider the following code: # let add x y = x + y;; val add : int -> int -> int = <fun> # let a = [10;20;30];; val a : int list = [10; 20; 30] # add 10 (add 20 (add 30 0));; - : int = 60 #.

Listing 14 16. SimpleSuggestionProvider Manifest File //filename: manifest.xml < xml version="1.0" encoding="utf-8" > <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.ai.android.search.simplesp" android:versionCode="1" android:versionName="1.0.0"> <application android:icon="@drawable/icon" android:label="Simple Search Suggestion Provider:SSSP"> <activity android:name=".SimpleMainActivity" android:label="SSSP:Simple Main Activity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <!-**************************************************************** * Search related code: search activity **************************************************************** --> <activity android:name=".SearchActivity" android:label="SSSP: Search Activity" android:launchMode="singleTop"> <intent-filter> <action android:name="android.intent.action.SEARCH" /> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> <meta-data android:name="android.app.searchable" android:resource="@xml/searchable" /> </activity> <meta-data android:name="android.app.default_searchable" android:value=".SearchActivity" /> <provider android:name=".SimpleSuggestionProvider" android:authorities ="com.ai.android.search.simplesp.SimpleSuggestionProvider" /> </application> <uses-sdk android:minSdkVersion="4" /> </manifest>

Almost all the calls from managedQuery and ContentResolver are directed eventually to the provider class. Knowing how a provider implements each of these methods gives us enough clues as to how those methods are used by a client. In the next section, we ll cover the implementation from scratch of an example content provider called BookProvider.

Notice how the authority of the simple suggestions provider matches in the source code (Listing 14 15) and the manifest files (Listing 14 16). In both cases the value of this authority is

In the example, the zero added to 30 is the first argument. Each add call takes two arguments: one is a number, and the other is the result of another call to the add function. The left-handed version of the fold command processes the list elements from left to right, whereas the right-handed version does the opposite. These two functions are very powerful. The folding examples provided use the addition function to create a sum of the elements in the list. val val val val val iter : ('a -> unit) -> 'a list -> unit map : ('a -> 'b) -> 'a list -> 'b list rev_map : ('a -> 'b) -> 'a list -> 'b list fold_left : ('a -> 'b -> 'a) -> 'a -> 'b list -> 'a fold_right : ('a -> 'b -> 'b) -> 'a list -> 'b -> 'b

We will talk about the other sections of this manifest file when we cover the other aspects of this Simple Suggestions Provider.

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