| Activity Lifecycle Methods | ||
|---|---|---|
| onCreate() | Called when activity first created | No |
| onRestart() | Called after activity stopped, prior to restarting | No |
| onStart() | Called when activity is becoming visible to user | No |
| onResume() | Called when activity starts interacting with user | No |
What are the life cycle methods of Android activity?
There are seven methods that manage the life cycle of an Android application:
- onCreate()
- onStart()
- onResume()
- onRestart()
- onPause()
- onStop()
- onDestroy()
What is the lifecycle service in Android?
A service is started when an application component, such as an activity, starts it by calling startService(). Once started, a service can run in the background indefinitely, even if the component that started it is destroyed. A service is bound when an application component binds to it by calling bindService().
What is the first Android activity life cycle?
The Activity lifecycle consists of 7 methods: onCreate() : When a user first opens an activity than the first method that gets called is called as onCreate. It acts the same as a constructor of a class, then when an activity is instantiated then onCreate gets called.
What is an android process?
You can also set android:process so that components of different applications run in the same process—provided that the applications share the same Linux user ID and are signed with the same certificates. … A process is started again for those components when there’s again work for them to do.
What is onCreate method in Android?
onCreate is used to start an activity. super is used to call the parent class constructor. setContentView is used to set the xml.
What does finish () do in Android?
When calling finish() on an activity, the method onDestroy() is executed. This method can do things like: Dismiss any dialogs the activity was managing. Close any cursors the activity was managing.
Why service is used in Android?
Android service is a component that is used to perform operations on the background such as playing music, handle network transactions, interacting content providers etc. It doesn’t has any UI (user interface). The service runs in the background indefinitely even if application is destroyed.
Is it possible activity without UI in Android?
The answer is yes it’s possible. Activities don’t have to have a UI. It’s mentioned in the documentation, e.g.: An activity is a single, focused thing that the user can do.
What are the main four pillars of Android application?
Android applications are broken down into four main components: activities, services, content providers, and broadcast receivers.
What are the main two types of thread in Android?
Android has four basic types of threads. You’ll see other documentation talk about even more, but we’re going to focus on Thread , Handler , AsyncTask , and something called HandlerThread . You may have heard HandlerThread just called the “Handler/Looper combo”.
What is the use of application class in Android?
The Application class in Android is the base class within an Android app that contains all other components such as activities and services. The Application class, or any subclass of the Application class, is instantiated before any other class when the process for your application/package is created.