Contus – Android Interview Questions
Here is the list Android Interview Questions which are recently asked in Contus company. These questions are included for both Freshers and Experienced professionals.
1. What is Application?
Android apps can be written using Kotlin, Java, and C++ languages. The Android SDK tools compile your code along with any data and resource files into an APK, an Android package, which is an archive file with an .Each process has its own virtual machine , so an app's code runs in isolation from the other apps.
2. What is Context?
Context is defined as: Interface to global information about an application environment. It allows access to application-specific resources and classes, as well as the up-calls for application-level operations such as launching activities, broadcasting and receiving intents, etc.
3. What is Armv7?
ARMv6 and ARMv7 are two different versions of CPU architecture developed by ARM. ARMv6 is older & ARMv7 is newer. ARMv6 was used in the ARM11 & ARM Cortex-M CPU families. ARMv7 is used in ARM Cortex-A, ARM Cortex-M, ARM Cortex-R CPU families.
4. Why bytecode cannot be run in Android?
Android uses Dalvik virtual machine instead of the Java VM. To run a Java Bytecode you need Java Virtual Machine. Java in computers and Android uses a separate environment to run their code.
5. What is a BuildType in Gradle? And what can you use it for?
BuildType class. In the release block on the example, minifyEnabled refers to the automatic removal of unused resources in the packaged app. If true, Gradle also removes resources from the dependent libraries if they are not needed. This only works if the shrinkResources property is also set to true.
6. Explain the build process in Android.
The build process in Android are:- The compilers convert your source code into DEX files, which include the bytecode that runs on Android devices, and everything else into compiled resources.
- The packager combines the DEX files and compiled resources into an APK or AAB, depending on the chosen build target.
7. What is the Android Application Architecture?
Android architecture contains different number of components to support any android device needs. Android software contains an open-source Linux Kernel having collection of the number of C/C++ libraries which are exposed through an application framework services.
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8. What’s the difference between onCreate() and onStart()?
onCreate() is called when the when the activity is first created. onStart() is called when the activity is becoming visible to the user.
9. Difference between AsyncTasks & Threads?
Thread can be triggered from any thread, main or background; but AsyncTask must be triggered from the main thread. Also on lower API of Android, one instance of AsyncTask can be executed only once.
10. What is the AndroidManifest.xml? What is the proper way of setting up an Android-powered device for app development?
The following are steps to be followed prior to the actual application development in an Android-powered device: - Declare your application as “debuggable” in your Android Manifest. - Turn on “USB Debugging” on your device. - Set up your system to detect your device.
11. Enumerate the steps in creating a bounded service through AIDL.
- Create the .aidl file. This file defines the programming interface with method signatures.
- Implement the interface. The Android SDK tools generate an interface in the Java programming language, based on your .
- Expose the interface to clients.
12. What are the core components under the Android application architecture?
The core building blocks or fundamental components of android are activities, views, intents, services, content providers, fragments and AndroidManifest. xml.
13. What composes a typical Android application project?
A project under the android development, upon compilation, becomes an . apk file. xml file, application code, resource files, and other related files.
14. What is portable wi-fi hotspot?
A portable WiFi hotspot is a pocket sized mobile router, which you can take with you setup an internet connection. Most portable hotspots devices use the 3G and 4G signals from the network providers to enable the connection. Mobile WiFi hotspots therefore often need a SIM-card that provides the connectivity.
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