Eclipse Mobile Mousw Bedienungsanleitung PDF herunterladen (Seite 5)

clicking and tapping to operate. Sure, there are menus and buttons to be tapped, but

Android has an innovative design element to its architecture known as an intent.

The intent

An intent is a construct that permits an application to issue a request, which is

somewhat like a help-wanted sign. It might look like this:

"Wanted: An application to help me look up a contact" or "Wanted: An application to

help me display this image" or "Wanted: An application to perform this

geographic-based search."

In a similar and complementary fashion, applications can register themselves as

capable and interested in performing satisfying various requests or intents. To follow

the classified advertising paradigm, these might look like this:

"Available: Application ready and willing to present contact records in clear, concise

manner," or "Available: Application ready and willing to perform a geographic

search."

These are examples of IntentFilters, which are discussed next.

The IntentFilter

Applications announce their availability to perform these types of operations via a

construct known as an IntentFilter. The IntentFilter is either registered at

runtime or is enumerated in the AndroidManifest.xml file. The following snippet

comes from an Android application that responds to incoming SMS (text) messages:

Listing 1. Android application responding to incoming SMS

<intent-filter>

</intent-filter>

</receiver>

After this brief introduction to the intent and IntentFilter, the next section

introduces the four main types of Android applications.

Section 3. Android applications A quick survey

ibm.com/developerWorks developerWorks®

Develop Android applications with Eclipse

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Eclipse Mobile Mousw Bedienungsanleitung Seite 5