Android programming is growing day by day. The questions
asked by interviewers in android is given below. A list of top android
interview questions and answers are given below.
SDK Tools
Android programming is growing day by day. The questions
asked by interviewers in android is given below. A list of top android
interview questions and answers are given below.
1. What is Android?
Android is an open-source, linux-based operating system that
is 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 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.
4. What are the code
names of android?
Aestro
Blender
Cupcake
Donut
Eclair
Froyo
Gingerbread
Honycomb
Ice Cream Sandwitch
Jelly Bean
Kitkat
Lollipop
Marshmallow
5. What are the
advantages of android?
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..
6. Does android support
other language than java?
Yes, 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?
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:
onCreate()
onStart()
onResume()
onPause()
onStop()
onRestart()
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:
Implicit Intent
Explicit Intent
11. What is implicit
intent in android?
Implicit intent is used to invoke the system components.
12. What is explicit
intent in android?
Explicit intent is used to invoke the activity class.
13. How to call
another activity in android?
1. Intent i = new
Intent(getApplicationContext(), ActivityTwo.class);
2.
startActivity(i);
14) What is service
in android?
A service is a component that runs in the background. It is
used to play music, handle network transaction etc.
15. What is the name
of database used in android?
SQLite: An opensource and lightweight relational database
for mobile devices.
16. What is AAPT?
AAPT is an acronym for android asset packaging tool. It
handles the packaging process.
17. What is content
provider?
Content providers are used to share information between
android applications.
18. What is fragment?
Fragment is a part of Activity. By the help of fragments, we
can display multiple screens on one activity.
19. What is ADB?
ADB stands for Android Debug Bridge. It is a command line
tool that is used to communicate with the emulator instance.
20. What is NDK?
NDK 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.
21. What is ANR?
ANR stands for Application Not Responding. It is a dialog
box that appears if the application is no longer responding.
22. What is the
Google Android SDK?
The Google Android SDK is a toolset which is used by developers
to write apps on Android enabled devices. It contains a graphical interface
that emulates an Android driven handheld environment and allow them to test and
debug their codes.
23. What is an APK
format?
APK is a short form stands for Android Packaging Key. It is
a compressed key with classes,UI's, supportive assets and manifest. All files
are compressed to a single file is called APK.
24. Which language
does Android support to develop an application?
Android applications are written by using the java (Android
SDK) and C/C++ (Android NDK).
25. What is ADT in
Android?
ADT stands for Android Development Tool. It is used to
develop the applications and test the applications.
26. What is View
Group in Android?
View Group is a collection of views and other child views.
It is an invisible part and the base class for layouts.
27. What is Adapter
in Android?
An adapter is used to create a child view to present the
parent view items.
28. What is
nine-patch images tool in Android?
We can change bitmap images in nine sections as four
corners, four edges and an axis.
29. Which kernel is
used in Android?
Android is customized Linux 3.6 kernel.
30. What is
application Widgets in Android?
Application widgets are miniature application views that can
be embedded in other applications and receive periodic updates.
31. Which types of
flags are used to run an application on Android?
Following are two types of flags to run an application in
Android:
FLAG_ACTIVITY_NEW_TASK
FLAG_ACTIVITY_CLEAR_TOP
32. What is singleton
class in Android?
A singleton class is a class which can create only an object
that can be shared all other classes.
33. What is sleep
mode in Android?
In sleep mode, CPU is slept and doesn't accept any commands
from android device except Radio interface layer and alarm.
34. What do you mean
by a drawable folder in Android?
In Android, a drawable folder is compiled visual resource
that can use as a backgrounds, banners, icons, splash screen etc.
35. What is DDMS?
DDMS stands for Dalvik Debug Monitor Server. It gives the
wide array of debugging features:
Port forwarding services
Screen capture
Thread and heap information
Network traffic tracking
Location data spoofing
36. Define Android
Architecture?
Android architecture consists of 4 components:
Linux Kernal
Libraries
Android Framework
Android Applications
37. What is a
portable wi-fi hotspot?
The portable wi-fi hotspot is used to share internet
connection to other wireless devices.
38. Name the dialog
box which are supported by android?
Alert Dialog
Progress Dialog
Date Picker Dialog
Time picker Dialog
39. Name some
exceptions in android?
Inflate Exception
Surface.OutOfResourceException
SurfaceHolder.BadSurfaceTypeException
WindowManager.BadTokenException
40. What are the
basic tools used to develop an android app?
JDK
Eclipse+ADT plugin
SDK Tools
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I have a table with 3 columns
Col1 Col2 Col3 lowrange highrange
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BRID C 3 1 5
BRID C 5 1 5
BRID B 1 1 7
BRID B 2 1 7
BRID B 3 1 7
BRID B 5 1 7
BRID B 7 1 7
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Col1 Col2 Col3
BRID A 1
BRID A 2
BRID A 3
BRID C 1
BRID C 2
BRID C 3
BRID C 4
BRID C 5
BRID B 1
BRID B 2
BRID B 3
BRID B 4
BRID B 5
BRID B 6
BRID B 7
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