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Top Android Interview Questions and Answers for 2019 – CBitss Technologies

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Top Android Interview Questions and Answers for 2019 – CBitss Technologies

Why you can’t  be able to run standard Java bytecode on Android?

Answer: Android utilizes Dalvik Virtual Machine (DVM) which requires a exceptional bytecode. First of all, we have need to change Java class files into Dalvik Executable files utilizing  an Android tool called “dx”. In ordinary conditions, developers will not be utilizing this tool directly and fabricate tools will care for the generation of DVM compatible files .

Can Android application only be programmed in Java?

Answer: No, it is not required . You can program Android application  can be created utilizing NDK in C/C++. The NDK is a toolset that enables you to execute parts of your application  utilizing native-code languages for example C and C++. Regularly, great utilize cases for the NDK are CPU-intensive application for example game engines, signal processing, and physics simulation.

Distinction between an ordinary .png and a nine-fix picture?

Answer: It is a resizable bitmap asset that can be utilized for backgrounds or other images on the gadget . NinePatch class grants drawing a bitmap in nine segments . The nine patch images have extension as.9.png. It permits extension in 9  different ways, i.e. 4 corners that are unscaled, 4 edges that are scaled in 1 axis, and the center one that can be scaled into both axes .

Top-Android-Interview-Questions-and-Answers-for-2019

What are the distinctive storage methods in Android?

Answer: Android offers several distinct alternatives for data persistence. Shared Preferences – Store private primitive information in key-value sets. This occasionally gets constrained as it offers only key-value sets . You cannot save your individual java types. Internal Storage – Store private information on the device memory .

 

What is an ANR warning in Android?

Answer: ANR is short for application location Not Responding. Android frameworks show this dialog if the application location is performing excessively of task on the fundamental thread and has been unresponsive from quite a while .

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Can you convey executable JARs on Android? Which packaging is supported by Android?

Answer: No, Android stage does not support JAR arrangements . application are packed into Android Package (.apk) utilizing  Android Asset Packaging Tool (AAPT) and afterward conveyed onto Android stage. Google gives Android Development Tools for Eclipse that can be utilized to produce Android Package .

How can ANR be prevented?

Answer: One procedure that keeps the Android framework from finishing up a code that has been responsive for a significant lot of time is to make a child thread. Inside the child thread, most of the actual tasks of the codes can be placed, so that the fundamental thread runs with minimal periods of unresponsive time .

Difference between Mobile application Testing and Mobile Testing?

Answer: Mobile application  testing is the testing of application on a device which mainly focuses on functions and features of the application .

And Mobile Testing is the testing of the actual mobile device and target on the mobile appearance like Call, SMS, Contacts, Media Player, inbuilt browsers etc.

Define and clarify Android Framework.

Answer: Android structure is a arrangement of API’s utilizing  which the Android developers compose code for the mobile application . It contains the strategies and classes to compose the programming code.

Android structure incorporates a alternate arrangement of tools to make image pane, text field, buttons, etc. It also incorporates “Activities” with which the client communicates and “Services”, which are the programs that kept running in the background. It is a package of various components like Intents, Broadcast Receivers, Content Providers, and so on.

 

What is implied by Services?

Answer: Service is an Android part which keeps running in the background and acts independently. It does not provide any user interface.

Though the services are running behind the scene, a clients can proceed their work on various application . More often, the clients don’t know about the services which are running in the background. These services enable the framework to kill the procedure without interrupting the client’s progressing work .

For more Information About Android You Can Join Cbitss Technologies. CBitss Provides Best Android training in chandigarh


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