Context is an “interface” to the global information about an application environment. It allows access to application-specific resources and classes, as well as up-calls for application-level operations, such as launching activities, broadcasting and receiving intents, etc.
A Context is a handle to the system; it provides services like resolving resources, obtaining access to databases and preferences, and so on. An Android app has activities. Context is like a handle to the environment your application is currently running in. The activity object inherits the Context object.
Secondly, what is context in web application? The context root of a web application determines which URLs Tomcat will delegate to your web application. When a web application is deployed inside an EAR file, the context root is specified in the application. xml file of the EAR, using a context-root element inside of a web module.
Secondly, what is the difference between activity context and application context?
They are both instances of Context, but the application instance is tied to the lifecycle of the application, while the Activity instance is tied to the lifecycle of an Activity. The Activity context presumably has some information about the current activity that is necessary to complete those calls.
What are the different kinds of context in Android?
Mainly two types of context:
- Application Context: It is the application and we are present in Application. For example – MyApplication(which extends Application class). It is an instance of MyApplication only.
- Activity Context: It is the activity and we are present in Activity. For example – MainActivity.
What is an application context?
ApplicationContext is an interface for providing configuration information to an application. There are multiple classes provided by springframework that implements this interface and helps us use configuration information in applications. ApplicationContext provides standard bean factory lifecycle capabilities.
What is context how is it used?
In practice, Context is actually an abstract class, whose implementation is provided by the Android system. It allows access to application-specific resources and classes, as well as up-calls for application-level operations, such as launching activities, broadcasting and receiving intents, etc.
What is service context?
The ServiceContext class holds contextual information for a service. It aggregates information necessary for features used throughout Liferay’s portlets, such as permissions, tagging, categorization, and more.
How can I get current activity?
Android called “CurrentActivity”. Then if you want to access the current activity anywhere in your Android application, library, or plugin simply call: CrossCurrentActivity. Current. Activity and you will have the current activity.
What is context in C?
Context refers to the execution context, which is the symbols reachable from a given point in the code, and the value of those symbols in that particular execution.
What is content provider in Android?
A content provider manages access to a central repository of data. A provider is part of an Android application, which often provides its own UI for working with the data. However, content providers are primarily intended to be used by other applications, which access the provider using a provider client object.
What is an activity in Android?
An Android activity is one screen of the Android app’s user interface. In that way an Android activity is very similar to windows in a desktop application. An Android app may contain one or more activities, meaning one or more screens.
What is a context in Java?
A Context represents your environment. It represents the state surrounding where you are in your system. For example, in web programming in Java, you have a Request, and a Response. These are passed to the service method of a Servlet. A property of the Servlet is the ServletConfig, and within that is a ServletContext.
What is getApplicationContext in Android Studio?
getApplicationContext() : Returns the context for the entire application (the process all the Activities are running inside of). Use this instead of the current Activity context if you need a context tied to the lifecycle of the entire application, not just the current Activity.
What is toast in Android?
An Android Toast is a small message displayed on the screen, similar to a tool tip or other similar popup notification. A Toast is displayed on top of the main content of an activity, and only remains visible for a short time period.
What is the use of intent in android?
An intent is to perform an action on the screen. It is mostly used to start activity, send broadcast receiver,start services and send message between two activities. There are two intents available in android as Implicit Intents and Explicit Intents. Here is a sample example to start new activity with old activity.
What is context path in Web application?
The context path of a web application defines the URL that end users will access the application from. A simple context path like myapp means the web app can be accessed from a URL like http://localhost:8080/myapp.
What is the context path?
The context path is the prefix of a URL path that is used to select the context(s) to which an incoming request is passed. Typically a URL in a Java servlet server is of the format http://hostname.com/contextPath/servletPath/pathInfo, where each of the path elements can be zero or more / separated elements.
How do you initialize Spring application context in web application?
Spring can be easily integrated into any Java-based web framework. All you need to do is to declare the ContextLoaderListener in your web. xml and use a contextConfigLocation to set which context files to load. You can then use the WebApplicationContext to get a handle on your beans.
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