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Interview :: Android

Android - General Questions
1) What is Android?

Android is an open-source, Linux-based operating system used in mobiles, tablets, televisions, etc.

2) Who is the founder of Android?

Andy Rubin.

3) Explain the Android application Architecture.

Following is a list of components of Android application architecture:

  • Services: Used to perform background functionalities.
  • Intent: Used to perform the interconnection 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.
4) What are the code names of android?
  1. Aestro
  2. Blender
  3. Cupcake
  4. Donut
  5. Eclair
  6. Froyo
  7. Gingerbread
  8. Honeycomb
  9. Ice Cream Sandwich
  10. Jelly Bean
  11. KitKat
  12. Lollipop
  13. Marshmallow
5) What are the advantages of Android?

Open-source: It means no license, 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 a highly optimized virtual machine for mobile devices, called DVM (Dalvik Virtual Machine).

6) Does android support other languages than java?

Yes, an android app can be developed in C/C++ also using android NDK (Native Development Kit). It makes the performance faster. It should be used with Android SDK.

7) What are the core building blocks of android?

The core building blocks of Android are:

  • Activity
  • View
  • Intent
  • Service
  • Content Provider
  • Fragment etc.
8) What is activity in Android?

Activity is like a frame or window in java that represents GUI. It represents one screen of android.

9) What are the life cycle methods of android activity?

There are 7 life-cycle methods of activity. They are as follows:

  1. onCreate()
  2. onStart()
  3. onResume()
  4. onPause()
  5. onStop()
  6. onRestart()
  7. onDestroy()

10) What is intent?

It is a kind of message or information that is passed to the components. It is used to launch an activity, display a web page, send SMS, send email, etc. There are two types of intents in android:

  1. Implicit Intent
  2. Explicit Intent
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