where is the component tree in android studio 2.2.3

Such requests are handled by the methods of the Content Resolver class. Content ProvidersĪ content provider component supplies data from one application to others on request. A broadcast receiver is implemented as a subclass of BroadcastReceiver class and each message is broadcasted as an Intent object. For example, applications can also initiate broadcasts to let other applications know that some data has been downloaded to the device and is available for them to use, so this is broadcast receiver who will intercept this communication and will initiate appropriate action.

Broadcast Receiversīroadcast Receivers simply respond to broadcast messages from other applications or from the system. For example, a service might play music in the background while the user is in a different application, or it might fetch data over the network without blocking user interaction with an activity.

A service could for instance check a remote server for updates, or backup data every hour etc. The Android app starts by showing the main activity, and from there the app may make it possible to open additional activities ServicesĪndroid services are background processes that can be executed on an Android device, even if no application is visible. An Android app may contain one or more activities, meaning one or more screens. In that way an Android activity is very similar to windows in a desktop application. An Android activity is one screen of the Android app’s user interface. ActivitiesĪn activity represents a single screen with a user interface. The APK file contains the compiled Java code and other resources like texts and images for the Android application. An app is packaged in an APK file (Android application package). They handle data and database management issues.Īn Android app is an Android application. They handle communication between Android OS and applications. They handle background processing associated with an application. They dictate the UI and handle the user interaction to the smart phone screen

These components are loosely coupled by the application manifest file Android Manifest.xml that describes each component of the application and how they interact. Elements of the AndroidManifest.xml fileĪpplication components are the essential building blocks of an Android application.

Where is the component tree in android studio 2.2.3