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Android Questions & Answers (Compiled from UPSC, SSC ,PSC ,IBPS previous question papers)

  • When is the onStop() method invoked?

  • AA call to onStop method happens when an activity is no longer visible to the user, either because another activity has taken over or if in front of that activity.
  • What is the function of an intent filter?

  • ABecause every component needs to indicate which intents they can respond to, intent filters are used to filter out intents that these components are willing to receive. One or more intent filters are possible, depending on the services and activities that is going to make use of it.
  • What is ANR in android?

  • AANR stands for application is not responding, basically it is a dialog box that appears when the application is not responding.
  • What is ADT in Android?

  • AADT stands for Android Development Tool. It is used to develop the applications and test the applications.
  • What is ADB in android?

  • AIt is acts as bridge between emulator and IDE, it executes remote shell commands to run applications on an emulator
  • What is NDK?

  • ANDK stands for Native Development Kit. By using NDK, you can develop a part of app using native language such as C/C++ to boost the performance.
  • What is ADB?

  • AADB stands for Android Debug Bridge. It is a command line tool that is used to communicate with the emulator instance.
  • What are the notifications available in android?

  • A

    Toast Notification − It will show a pop up message on the surface of the window

    Status Bar Notification − It will show notifications on status bar

    Dialogue Notification − It is an activity related notification.

  • What are the four essential states of an activity?

  • A

    – Active – if the activity is at the foreground
    – Paused – if the activity is at the background and still visible
    – Stopped – if the activity is not visible and therefore is hidden or obscured by another activity
    – Destroyed – when the activity process is killed or completed terminated

     

  • What is fragment?

  • AFragment is a part of Activity. By the help of fragments, we can display multiple screens on one activity.
  • What is a content provider in android?

  • AA content provider component supplies data from one application to others on request. Such requests are handled by the methods of the ContentResolver class. A content provider can use different ways to store its data and the data can be stored in a database, in files, or even over a network.
  • What is the importance of Android in the mobile market?

  • ADevelopers can write and register apps that will specifically run under the Android environment. This means that every mobile device that is Android enabled will be able to support and run these apps. With the growing popularity of Android mobile devices, developers can take advantage of this trend by creating and uploading their apps on the Android Market for distribution to anyone who wants to download it.
  • What is viewGroup in android?

  • AView group is a collection of views and other child views, it is an invisible part and the base class for layouts.
  • What are containers?

  • AContainers, as the name itself implies, holds objects and widgets together, depending on which specific items are needed and in what particular arrangement that is wanted. Containers may hold labels, fields, buttons, or even child containers, as examples.
  • What is service in android?

  • AA service is a component that runs in the background. It is used to play music, handle network transaction etc.