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

  • What is the importance of XML-based layouts?

  • AThe use of XML-based layouts provides a consistent and somewhat standard means of setting GUI definition format. In common practice, layout details are placed in XML files while other items are placed in source files.
  • What do ADT stands for?

  • AADT stands for Android development tool,This is useful to develop the applications and test the applications.
  • What is activity?

  • AActivity is like a frame or window in java that represents GUI. It represents one screen of android.
  • Differentiate Activities from Services.

  • AActivities can be closed, or terminated anytime the user wishes. On the other hand, services are designed to run behind the scenes, and can act independently. Most services run continuously, regardless of whether there are certain or no activities being executed.
  • What is An android manifest file?

  • AEvery application must have an AndroidManifest.xml file (with precisely that name) in its root directory. The manifest file presents essential information about your app to the Android system, information the system must have before it can run any of the app's code.
  • Describe Activities.

  • AActivities are what you refer to as the window to a user interface. Just as you create windows in order to display output or to ask for an input in the form of dialog boxes, activities play the same role, though it may not always be in the form of a user interface.
  • What is an implicit Intent?

  • AImplicit Intent doesn't specifiy the component. In such case, intent provides information of available components provided by the system that is to be invoked.
  • What is adb?

  • AAdb simply stands for Android Debug Bridge. It presents developers with the power to perform shell commands that are remote. Its major work is to permit and direct communication towards and from the emulator port.
  • What is the use of an activityCreator?

  • AAn activityCreator is the first step towards the creation of a new Android project. It is made up of a shell script that will be used to create new file system structure necessary for writing codes within the Android IDE.
  • What are the advantages of android?

  • A

    Open-source: It means no licence, distribution and development fee.

    Platform-independent: It supports windows, mac and linux platforms.

    Supports various technologies: It supports camera, bluetooth, wifi, speech, EDGE etc. technologies.

    Highly optimized Virtual Machine: Android uses highly optimized virtual machine for mobile devices, called DVM (Dalvik Virtual Machine).

  • What is an explicit Intent?

  • AAndroid Explicit intent specifies the component to be invoked from activity. In other words, we can call another activity in android by explicit intent.
  • What is Orientation?

  • AOrientation dictates whether the LinearLayout is represented as a column or a roll, when it is set using setOrientationa(). The values are set as VERTICAL or as HORIZONTAL.
  • What is the APK format?

  • AThe Android packaging key is compressed with classes,UI's, supportive assets and manifest.All files are compressed to a single file is called APK.
  • What is ANR?

  • AANR is the acronym for Application Not Responding. When an application is unresponsive for a long time, the dialogue shows up to let the user know about the situation.
  • What are intents?

  • AIntents display messages of notification from within the Android enabled device to the user. Intents are used to notify the user when a particular state occurs, and users have the opportunity to respond to the notification.
  • What is AAPT?

  • AAAPT is short for Android Asset Packaging Tool. This tool provides developers with the ability to deal with zip-compatible archives, which includes creating, extracting as well as viewing its contents.
  • Explain the Android application Architecture.

  • A

    Following is a list of components of Android application architecture:

    • Services: Used to perform background functionalities.
    • Intent: Used to perform the inter connection between activities and the data passing mechanism.
    • Resource Externalization: strings and graphics.
    • Notification: light, sound, icon, notification, dialog box and toast.
    • Content Providers: It will share the data between applications.
  • What is An Activity?

  • AActivity performs actions on the screen.If you want to do any operations, we can do with activity
  • What Is the Google Android SDK?

  • AThe Google Android SDK is a toolset that developers need in order to write apps on Android enabled devices. It contains a graphical interface that emulates an Android driven handheld environment, allowing them to test and debug their codes.
  • What is Android?

  • AAndroid is a stack of software for mobile devices which includes an Operating System, middleware and some key applications. The application executes within its own process and its own instance of Dalvik Virtual Machine.c