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This article mainly introduces "how does Android find the responder of Intent". In the daily operation, I believe that many people have doubts about how to find the responder of Android. The editor consulted all kinds of materials and sorted out a simple and easy-to-use method of operation. I hope it will be helpful to answer the question of "how does Android find the responder of Intent"! Next, please follow the editor to study!

Android as a mobile operating system, most people regard it as object-oriented support, that it is a substitute for Symbian, an extension, but in fact, Android code and Symbian is a completely different operating system.

Although Intent Receiver uses NotificationManager to notify users when events of interest occur, it does not generate a UI. Ntent Receiver is registered in AndroidManifest.xml, but it can also be registered using Context.registerReceiver () in Android code.

When an intent receiver is triggered, your application does not have to call intent receiver on the request, the system will launch your application when needed. Various applications can also broadcast their own intent receiver to other applications by using Context.broadcastIntent ().

A Service is a long-life program without a user interface. A good example is a media player that is playing songs from a playlist. In a media player application, there should be multiple activity that allow users to select and play songs. However, there is no corresponding activity for music playback.

Because users will of course think that the music should still be playing when navigating to other screens. In this example, the media player the activity uses Context.startService () to launch a service. So that you can keep the music playing in the background. At the same time, the system will keep the service running until the service is finished. In addition, we can also use the Context.bindService () method.

Connect to a service (start the service if it is not already running). After connecting to a service, we can also communicate with it through the interface provided by service. Take the media player as an example, we can also pause, replay and other operations.

Applications can save their data to files, SQL databases, or even any valid device. When you want to share your application data with other applications. Content Provider will be very useful. A Content Provider class implements a set of standard methods that allow other applications to save or read the various data types processed by this Content Provider.

In an Android application, it is mainly composed of some components, (Activity,Service,ContentProvider,etc.) Intent assists in the communication between these components. As some people parse on the Internet, Intent is responsible for describing the action, action involving data and additional data of an operation in the application, while Android is based on the description of this Intent.

Responsible for finding the corresponding component, passing the Intent to the calling component, and completing the component call. Intent plays the role of decoupling between the caller and the callee here. During Intent delivery, there are two ways to find the target consumer (another Activity,IntentReceiver or Service), that is, the responder of Intent, to match:

Public TestB extents Activity {. }; public class Test extends Activity {. Public void switchActivity () {Intent I = new Intent (Test.this, TestB.class); this.startActivity (I);}}

The Android code is simple and straightforward, and once the switchActivity () function is executed, it immediately jumps to the Activity named TestB.

At this point, the study on "how Android can find the responder of Intent" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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