What is the difference between context and getApplicationContext?

What is the difference between context and getApplicationContext?

What is the difference between context and getApplicationContext?

In getApplicationContext(), our Context is tied to Application and its lifecycle. The difference is that Application’s Context is not UI related.

When would you call getApplicationContext () and why?

You only use getApplicationContext() when you know you need a Context for something that may live longer than any other likely Context you have at your disposal. Scenarios include: Use getApplicationContext() if you need something tied to a Context that itself will have global scope.

What does MainActivity this mean?

MainActivity. this refers to the MainActivity context which extends Activity class but the base class ( Activity ) also extends Context class, so it can be used to offer activity context.

What is getBaseContext in Android?

getBaseContext() is the method of ContextWrapper . And ContextWrapper is, “Proxying implementation of Context that simply delegates all of its calls to another Context. Can be subclassed to modify behavior without changing the original Context.” (as per javadocs)..

What is Intent class in Android?

An Intent is a messaging object which provides a facility for performing late runtime binding between the code in different applications in the Android development environment.

What is ContextWrapper?

android.content.ContextWrapper. Known direct subclasses. Application, BackupAgent, ContextThemeWrapper, IsolatedContext, MutableContextWrapper, RenamingDelegatingContext, Service. Application. Base class for maintaining global application state.

What is the 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.

What is the purpose of MainActivity?

The primary role of Activity is to present the user with a user interface. Whether that is “a login option or whatever” is up to you. Or should MainActivity just have instructions to be executed at the apps launch, and then redirect to another java file that will present the user with the first thing s/he sees?

What is the main purpose of MainActivity class?

In Mobile SDK apps, the main activity begins immediately after the user logs in. Once the main activity is running, it can launch other activities, which in turn can launch sub-activities. When the application exits, it does so by terminating the main activity.

What is ContextThemeWrapper class in android?

A context wrapper that allows you to modify or replace the theme of the wrapped context.

What is ContextWrapper android?

When to use application context in Android application?

So always remember, in case of Singleton (lifecycle is attached to the application lifecycle), always use the Application Context. So, now when to use the Activity Context. Whenever you are in Activity, for any UI operations like showing toast, dialogs, and etc, use the Activity Context.

When to use getapplicationcontext in JavaScript?

getApplicationContext () – Return the context of the process of all activity running inside it. If you need a context that bind entire lifecycle of application you can use this.

What is context in getcontext ( ) in Android?

In getContext (), Context is tied to an Activity and its lifecycle. We can imagine Context as layer which stands behind Activity and it will live as long as Activity lives. The moment the Activity dies, Context will too. Activity’s Context has its own functionalities, which we can use for all sort of things Android framework supports.

Do you need to subclass getapplicationcontext in Android?

When looking at the Android code, you see that when attached, an activity receives a base context and an application, and those are different parameters. getApplicationContext () delegates it’s call to baseContext.getApplicationContext (). One more thing : the documentation says that it most cases, you shouldn’t need to subclass Application: