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So far, we have discussed a number of aspects about intents. To recap, we talked about actions, data URIs, extra data, and finally categories. Given these aspects, Android uses the following algorithm to resolve the intents to activities. At the top of the hierarchy, with an air of exclusivity, is the component name attached to an intent. If this is set, then every other aspect or attribute of the intent is ignored and that component is chosen for execution. Android then looks at the action attribute of the intent. If the intent indicates an action, then the target activity must list that action as part of its intent-filter. If no other attributes are specified, then Android invokes this activity. If there are multiple activities, Android will present the activity chooser. Android then looks at the data portion of the intent. If the intent specifies a data URI, the type is retrieved from this URI via ContentProvider.getType() if it is not already supplied in the intent. The target activity must indicate through an intent-filter that it can handle data of this type. If the data URI is not a content URI or the data type is not specified, then the URI scheme is taken into account. The target activity then should indicate that it could handle the URIs of this type of scheme. Android then looks at the category. Android will only pick activities matching that category. As a result, if the intent category is specified, then the target activity should declare this category in its intent-filter.

There are more functions available, but this gives you the idea. The functoral interface to sets enables sets to operate on any type. If you are familiar with generics from languages such as C++ and C#, you might notice that functors share some of the same concepts. Functors are not generics, but they do solve some of the same problems (for example, allowing collections to contain various types).

This example demonstrates the ACTION_SEARCH vs. the ACTION_VIEW. Once you have used this suggestion provider a few times, Android will present the suggestions as part of the main choice and not more . Figure 14 33 shows an example in which we have typed chiaroscuro.m in the global QSB.

Notice how the suggestions are directly presented without a further more prompt. Now if you click on the free dictionary suggestion you will see the invoked browser as in Figure 14 34.

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So far we have exercised intents or actions that mainly invoke another activity without expecting any results back. Now let s look at an action that is a bit more involved in that it returns a value after being invoked. ACTION_PICK is one such generic action. The idea of ACTION_PICK is to start an activity that displays a list of items. The activity then should allow a user to pick one item from that list. Once the user picks the item, the activity should return the URI of the picked item to the caller. This allows reuse of the UI s functionality to select items of a certain type. You should indicate the collection of items to choose from using a MIME type that points to an Android content cursor. The actual MIME type of this URI should look similar to the following: vnd.android.cursor.dir/vnd.google.note It is the responsibility of the activity to retrieve the data from the content provider based on the URI. This is also the reason that data should be encapsulated into content providers where possible. For all actions that return data like this, we cannot use startActivity() because startActivity() does not return any result. startActivity() cannot return a result because it opens the new activity as a modal dialog in a separate thread and leaves the main thread for attending events. In other words, startActivity() is an asynchronous call with no callbacks to indicate what happened in the invoked activity. But if you want to return data, you can use a variation on startActivity() called startActivityForResult(), which comes with a callback.

Notice how the suggestion provider hasn t provided anything back. This concludes our discussion of building a functional custom suggestions provider from scratch. Although we ve covered any aspects of search, there are still a couple of topics that we haven t talked about. These are action keys and Application-Specific search data. We will cover these next.

A map is essentially a mapping between an element of one type to another element Maps are also ordered, which is one of the things that distinguishes them from hashtables Maps are much less complicated than sets and have fewer operations Maps are not as fast as hashtables, but they offer a purely functional data structure that can be operated on without side effects Maps also allow for finer control over how the internals are ordered because you must pass a function that defines the internal ordering Keep in mind that the word map is used by many modules and functions In fact, there is a map function in the Map module # module MyMap = MapMake(String);; module MyMap : sig type key = Stringt type 'a t = 'a MapMake(String).

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