Explanation: There are four main components that can be used within an Android application : Activities, Services, Broadcast Receivers and Content Providers. 2.
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 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.
What are the layouts available in Android Mcq?
Explanation. Android is having Linear Layout(Horizontal and Vertical), Frame Layout, Table Layout, and Relative Layout.
Which among the following are part of application layer of Android architecture Mcq?
Answer. Browser : Safari and Google Chrome are pre-installed as default web browsers on most mobile devices. Phone : Phone application are pre-installed as default calling application on all the mobile devices.
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.
How many types of layouts are there in Android?
Android Layout Types
| Sr.No | Layout & Description |
|---|---|
| 1 | Linear Layout LinearLayout is a view group that aligns all children in a single direction, vertically or horizontally. |
| 2 | Relative Layout RelativeLayout is a view group that displays child views in relative positions. |
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).
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 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 ANR Android?
When the UI thread of an Android app is blocked for too long, an “Application Not Responding” (ANR) error is triggered. If the app is in the foreground, the system displays a dialog to the user, as shown in figure 1. The ANR dialog gives the user the opportunity to force quit the app.
What is an interface in Android?
The user interface (UI) for an Android app is built as a hierarchy of layouts and widgets. The layouts are ViewGroup objects, containers that control how their child views are positioned on the screen. Widgets are View objects, UI components such as buttons and text boxes.
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.
How many layers are in Android Architecture?
Android operating system is a stack of software components which is roughly divided into five sections and four main layers as shown below in the architecture diagram.
What type of software is Android?
Android is a mobile operating system based on a modified version of the Linux kernel and other open source software, designed primarily for touchscreen mobile devices such as smartphones and tablets.
Which company owns the android?
The Android operating system was developed by Google (GOOGL) for use in all of its touchscreen devices, tablets, and cell phones. This operating system was first developed by Android, Inc., a software company located in Silicon Valley before it was acquired by Google in 2005.