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Application developers are responsible for generating and altering the source code of programs that run on computers. Developers of applications are also referred to as software developers or software architects. Find the most commonly asked interviews with mobile developers and the answers that you might encounter during your next interview with a mobile developer. Following are some Common Interview Questions For App Development.
List of Common Interview Questions for App Development
Q. Are all smartphones compatible with the latest Android operating systems?
Answer – Some Android phones permit you to upgrade to a higher version of the Android operating system. Not all upgrades will allow you to upgrade to the latest version. It all depends on your phone’s capabilities and specs to determine if it is capable of supporting the latest Android versions.
Q. What is an action?
Answer – In Android development, an Action is an action the intended sender would like to take or expects to receive as a reply. The intended action is the basis of most application functionality.
Q. Can you explain why and what sort of programming language is supported by Android for application development?
Answer – This question is majorly ask in interview questions for app development. The Java programming language is the primary language supported. We all know that Java programming language is the most used language for app development. This makes it easy for even new Android developers to create and deploy apps in the Android environment quickly.
Q. Can you tell me what are the core components under the Android app architecture?
Answer – There are five key components under the Android application architecture that includes Services, Intent, Resource Externalization, Notifications, and Content Providers.
Q. Can you tell me in app development when is the onStop() method invoked?
Answer- Yes, a call to onStop() triggers when the activity is not seeable to the user. This could be because another activity has taken control or if it is in front.
Q. Explain the importance of Default Resources.
Answer – If default resources (which contain default strings or files) are missing, the app will fail to run. Resources are placed in subdirectories named specifically under the project/res/ directory.
Q. What is a Fragment?
Answer – A fragment is a piece or part of an activity. You can combine it with other fragments to make it modular. You can also reuse fragments.
Q. What are APIs used for?
Answer – An API (Application Programming Interface) is a set function that allows applications to access data, interact with operating systems or microservices, and also allows them to access external software components.
Q. What are the four types of API?
Answer – Four types of APIs are commonly used in web-based apps. They are public, private, composite, and partner. The API “type” is used to indicate the intended use.
Q. According to you what steps you should take to prevent your created application from crashing?
Answer – Crashing or problems with the application were common in early application development. The application was released by programmers and then let users test it in production. This allowed them to identify any bugs or errors that could be fixed. This was inefficient and not productive as modern code is tested and validated before it is released. Although updates may be provided by application developers, they generally address user needs, performance improvements, or known bugs.
Q. What is hybrid app development?
Answer – Hybrid apps use web technologies such as HTML, CSS, and Javascript and are then wrapped in native applications using platforms like Cordova. Apps are displayed in their own embedded browser, such as UIWebView for iOS or WebView for Android (not Safari and Chrome). This allows you to use any web-native framework to develop mobile apps.
Q. Tell me some of the plus points of hybrid apps over native apps?
Answer – The significant advantage of hybrid apps is it works across numerous platforms. It also provides unified development, it is best with faster build and takes the lower cost of development and it is easier to make updates and changes.
Q. Do you know anything about Android Data Binding?
Answer – Data Binding Library allows you to bind UI elements in your layouts to data sources. The library binds them within your app using a declarative format rather than programmatically. Many layouts can be defined using code that calls the UI framework method. The following code uses findViewById(), to find a TextView widget. It then binds it to the userName variable of the viewModel variable.
TextView textView = findViewById(R.id.sample_text);
textView.setText(viewModel.getUserName());
Q. What is Android?
Answer – Android is an open-source operating system. It is primarily used on mobile devices like tablets and cell phones. It’s a Linux-based operating system with rich components. This allows developers to create apps that perform basic as well as advanced functions.
Q. Please tell me something about Google Android SDK?
Answer – The Google Android SDK provides developers with the toolset they need to create apps for Android-enabled devices. It offers a graphical interface for emulating an Android-driven handheld environment that allows developers to debug and test their code.
Q. What is the Android Architecture?
Answer – Android Architecture is composed of four key components that include, Linux Kernel, Libraries, Android Framework, and Android Applications.
Q. Do you know what the significance of XML-based layouts is?
Answer – XML-based layouts provide a consistent and relatively standard way to set GUI definition format. As a general rule, layout details are stored in XML files and other items in source files.
Q. What are containers?
Answer – Containers hold objects and widgets together. It all depends on what items are needed and how they are arranged. Containers can have labels, buttons, fields, buttons, or child containers.
Q. What is Orientation?
Answer – Orientation can be set with setOrientation(). It determines whether the LinearLayout should be represented as a column or a row where in; you can set the Horizontal and Vertical values.
Q. Explain what the four essential states of activity are?
Answer – The four fundamental states of activity are;
The Active State is the first and is used when activity is in the foreground.
Second is the Paused State, which is used to suspend activity while it is still visible.
The third is a Stopped state when an activity isn’t visitor covered up by another activity.
The state Forth is the Destroyed one that is created when an activity is stopped or terminated.
Last Words
The application development developer interview is more about technical. In simple words employer may tell you to crate something or implement any code or ask you find errors from the code. So be prepare for the technical interview questions for app development and do get the understanding of above common questions for application development interviews.
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