Celexa – Android Interview Questions
Here is the list Android Interview Questions which are recently asked in Celexa company. These questions are included for both Freshers and Experienced professionals.
1. What is the use of LINUX ID in android?
The Android platform takes advantage of the Linux user-based protection to identify and isolate app resources. This isolates apps from each other and protects apps and the system from malicious apps. To do this, Android assigns a unique user ID to each Android application and runs it in its the own process.
2. List the various storages that are provided by Android.
There are 4 type of storage that android provide.- Internal file storage: Store app-private files on the device file system.
- External file storage: Store files on the shared external file system.
- Shared preferences: Store private primitive data in key-value pairs.
- Databases: Store structured data in a private database.
3. How are layouts placed in Android?
Android treats the layout files as resources. Hence the layouts are kept in the folder reslayout. If you are using the eclipse, it creates a default XML layout file (main. xml) in the reslayout folder, which looks like the following XML code.
4. What is the implicit intent in android?
An implicit intent specifies an action that can invoke any app on the device able to perform the action. Using an implicit intent is useful when your app cannot perform the action, but other apps probably can and you would like the user to pick which app to use.
5. How to call another activity in android?
To start an activity, call startActivity() and pass it your Intent . The system receives this call and starts an instance of the Activity specified by the Intent . Now you need to create the DisplayMessageActivity class in the order for this to work.
6. What is service in android?
A Service is an application component that can perform the long-running operations in the background. It does not provide a user interface.For example, a service can handle network transactions, play music, perform file I/O, or interact with a content provider, all from the background.
7. What is the name of the database used in android?
SQLite Database is an open-source database provided in Android which is used to store data inside the user's device in the form of a Text file.
8. What is AAPT?
AAPT is a professional membership association of scientists dedicated to enhancing the understanding and appreciation of physics through teaching.
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9. What is ADB?
Android Debug Bridge is a versatile command-line tool that lets you communicate with a device. The adb command facilitates a variety of device actions, such as installing and debugging apps, and it provides access to a Unix shell that you can use to run a variety of commands on a device.
10. What is the Google Android SDK?
The Android software development kit is a set of development tools used to develop applications for the Android platform that has become Apple's biggest rival in the smartphone space.
11. What is an APK format?
APK files allow you to install apps on your Android phone. They're similar to the APPX files used to install Store apps on Windows 10, as well as corresponding the package files on other platforms.
12. Which language does Android support to develop an application?
Android apps can be written using Kotlin, Java, and C++ languages using the Android software development kit, while using the other languages is also possible.
13. What is DDMS?
A debugging tool from the Android software development kit . Able to monitor operations in the emulator as well as the real devices, DDMS reports the details of each processing thread and time spent whether in the app or Android OS.
14. Define Android Architecture?
Android architecture is a software stack of components to support the mobile device needs. Android software stack contains a Linux Kernel, collection of c/c++ libraries which are exposed through an application framework services, runtime, and application.
15. Name some exceptions in Android?
Exceptions in Android are:- AclNotFoundException.
- AndroidException.
- AppSearchException.
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