Terms in this set (10) Q 1 – Is it possible to have an activity without UI to perform action/actions? Generally, every activity is having its UI(Layout). But if a developer wants to create an activity without UI, he can do it.
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 is an activity in Android Mcq?
A) An activity is a window that contains the user interface of your application. … An application can have zero or more activities. C) An application can have only one activity. D) Option A and B are correct.
Is it mandatory to call onCreate () and onStart () in Android Mcq?
Q 9 – Is it mandatory to call onCreate() and onStart() in android? It is not mandatory, the program will work perfectly without fail, but the programmer has to implement the life cycle of activity.
What are return types of Startactivityforresult () in Android Mcq?
Options 1) RESULT_OK 2) RESULT_CANCEL 3) RESULT_CRASH 4) A & B.
How do you kill an activity?
Launch your application, open some new Activity, do some work. Hit the Home button (application will be in the background, in stopped state). Kill the Application — easiest way is to just click the red “stop” button in Android Studio. Return back to your application (launch from Recent apps).
What are interfaces in Android?
Interfaces are a collection of constants, methods(abstract, static, and default), and nested types. All the methods of the interface need to be defined in the class. … So basically in android, there are two types of interfaces we can create and we use frequently.
What are the main components in Android?
Introduction. There are four main Android app components: activities , services , content providers , and broadcast receivers . Whenever you create or use any of them, you must include elements in the project manifest.
What are the main two types of thread in Android?
Threading in Android
- AsyncTask. AsyncTask is the most basic Android component for threading. …
- Loaders. Loaders are the solution for the problem mentioned above. …
- Service. …
- IntentService. …
- Option 1: AsyncTask or loaders. …
- Option 2: Service. …
- Option 3: IntentService. …
- Option 1: Service or IntentService.
What is the package name of HTTP client in Android?
Android includes two HTTP clients: HttpURLConnection and Apache HTTP Client. Both support HTTPS, streaming uploads and downloads, configurable timeouts, IPv6 and connection pooling.
What is the life cycle of service Mcq?
Explanation. Service life cycle is as onCreate()−>onStartCommand()−>onDestory(). Q 19 – On which thread services work in android?
What is singleton class in Android Mcq?
Answer. Explanation: A singleton is a design pattern that restricts the instantiation of a class to only one instance. Notable uses include controlling concurrency and creating a central point of access for an application to access its data store.
What is Android ViewGroup?
A ViewGroup is a special view that can contain other views (called children.) The view group is the base class for layouts and views containers. This class also defines the ViewGroup. Android contains the following commonly used ViewGroup subclasses: LinearLayout.
What is the package name of JSON?
All npm packages contain a file, usually in the project root, called package. json – this file holds various metadata relevant to the project. This file is used to give information to npm that allows it to identify the project as well as handle the project’s dependencies.
What is startActivityForResult in Android?
By the help of android startActivityForResult() method, we can send information from one activity to another and vice-versa. The android startActivityForResult method, requires a result from the second activity (activity to be invoked).
What is a sandbox in Android?
The Android Application Sandbox, which isolates your app data and code execution from other apps. … An encrypted file system that can be enabled to protect data on lost or stolen devices. User-granted permissions to restrict access to system features and user data.