Q1 What is MVVM in Android?
Model—View—ViewModel (MVVM) is the industry-recognized software Architecture Pattern that overcomes all drawbacks of MVP and MVC design patterns. MVVM suggests separating the data presentation logic(Views or UI) from the core business logic part of the application.
The separate code layers of MVVM are:
- Model: This layer is responsible for the abstraction of the data sources. Model and ViewModel work together to get and save the data.
- View: The purpose of this layer is to inform the ViewModel about the user’s action. This layer observes the ViewModel and does not contain any kind of application logic.
- ViewModel: It exposes those data streams which are relevant to the View. Moreover, it serves as a link between the Model and the View.
The description of Model is as follows:
- MODEL: (Reusable Code – DATA) Business Objects that encapsulate data and behavior of application domain, Simply hold the data.
- VIEW: (Platform Specific Code – USER INTERFACE) What the user sees, The Formatted data.
- VIEWMODEL: (Reusable Code – LOGIC) Link between Model and View OR It Retrieves data from Model and exposes it to the View. This is the model specifically designed for the View.
Get to know more with an Example: How to Build a Simple Note Android App using MVVM and Room Database?
Top 25 Android Interview Questions and Answers For Experienced
The need for new technologies and their developers is increasing as the world is dynamically transforming digitally. Everyone nowadays relies on apps for a variety of functions, including acquiring information and keeping in touch with one another as well as daily activities like shopping, commuting, and bill payment. But have you wondered how much Android Developers are getting paid to do all these things? PayScale estimates that the annual compensation for an Android Software Engineer in India is ₹3,99,594. Here’s why you need to be thorough with the Top 25 Advanced Android Interview Questions to ace interviews in both product and service-based companies.
Likewise, the average income for an experienced Android developer in India is ₹13,16,973/-. When it comes to Android Developer Salaries in the United States and the United Kingdom, the figures are $113,900 and £35,554, respectively.
Many Android Developers are being hired by big giants like Google, Amazon, Facebook, and others as well as growing startups like Zomato, Paytm, and CRED. If you wish to be employed by one of these companies, go through these top 25 Advanced Android Interview Questions and their Answers to ace in interviews: