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We have already indicated how suggestion providers are used to allow applications to participate in global search Now we will demonstrate it We will start by explaining how a simple suggestion provider application is expected to work We will give you the list of files that are used in the implementation, which should give you a general idea of the application and what is involved in implementing it When you are writing a suggestion provider there are two main components One is a suggestion provider that is responsible for returning suggestions to Android search The second is a search activity that takes a query or a suggestion and turns it into search resultsWe will describe the responsibilities of each of these components and show how they are implemented through source code.

s Caution Lines of code that can be entered into the OCaml toplevel have a pound sign (#) prompt at the beginning of the line and continue until two semicolons (;;) mark the closure. Otherwise, the information shown are responses from the toplevel or signature information describing functions and values.

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We will also show you how you can create a simple suggestion provider using only a few lines by deriving from a prefabricated provider called SearchRecentSuggestionsProvider, which is available in the Android SDK We will then show you how our simple suggestion provider is defined in the manifest file Finally, we will show you what methods of the SearchRecentSuggestionsProvider are used We will give you the full source code for the search activity and show how it is defined in the manifest file We will also show you how this search activity stores recent suggestions so that they are available to the simple suggestion provider We will also talk about the search metadata that ties the search activity and the suggestion provider together, and we ll include in the application a simple search invoker activity that facilitates a local mechanism to invoke the search.

where clause. To explore this, let s take another look at the managedQuery method of the Activity class that we used in Listing 3-23. Here s its signature: public final Cursor managedQuery(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) Notice the argument named selection, which is of type String. This selection string represents a filter (where clause, essentially) declaring which rows to return, formatted as a SQL WHERE clause (excluding the WHERE itself). Passing null will return all rows for the given URI. In the selection string you can include s, which will be replaced by the values from selectionArgs in the order that they appear in the selection. The values will be bound as Strings. Because you have two ways of specifying a where clause, you might find it difficult to determine how a provider has used these where clauses and which where clause takes precedence if both where clauses are utilized. For example, you can query for a note whose ID is 23 using either of these two methods: //URI method managedQuery("content://com.google.provider.NotePad/notes/23" ,null ,null ,null ,null); or //explicit where clause managedQuery("content://com.google.provider.NotePad/notes" ,null ,"_id= " ,new String[] {23} ,null); The convention is to use where clauses through URIs where applicable and use the explicit option as a special case.

We will conclude this discussion with a tour of the application This will prepare us for next section, in which we will implement a custom suggestions provider that does not use the SearchRecentSuggestionsProvider, from scratch But first, let us first plan our simple suggestions provider application..

Because we are planning on inheriting from the SearchRecentSuggestionsProvider, the functionality of the resulting suggestion provider is pretty fixed. The SearchRecentSuggestionsProvider allows you to save the queries as they are presented to the search activity from the QSB. Once they are saved, they will be prompted back to the QSB through the suggestion provider. In the derived suggestion provider we simply initialize the base provider. There is nothing else we need to do there. We will also go with a minimal search activity that is just a text view, to show that the search activity has been invoked. Inside the search activity we will show you the methods that are used to save the queries.

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