Company’s Background : The company is recently funded startup and their main focus is on sustainable energy.
Round 1 : Telephonic Interview (about 30 minutes)
The interview began with a formal greeting and a brief introduction about the company, which as always before any interview you should already have a good idea about (That’s your Homework before you even think about preparing for the interview). I knew about the company but I didn’t interrupt the interviewer as he was really excited in telling me about it.
I was asked in details about the projects I’ve done and also about the experience I have had in this domain.
I described in detail about what I’ve made till then. I recently started development in Android so I didn’t have much in my arsenal. I made a Drink(Water) reminder app, a clock app, an apk converter and a gym fitness app. I told him about every app in detail and he asked me a few questions in between about some functionality of the apps.
Then he said he will be asking some basic Android and Java questions.
Q-1 : How’s the following described layout will be made? A single row with “Name” on the left and “College” on the right and an explicit divider on the bottom.
Ans : A horizontal linear layout nested inside a vertical linear layout.
Q-2 : How can the divider be implemented aside from the default provided by the Recycler and List Views?
- We can use the View view in the XML file.
- We can set the background color as what we want for the divider and then use padding for bottom.
- We can use Images for the divider (vector, so as to preserve quality and avoid pixelation)
Q-3 : Fragment lifecycle methods or what are the methods that fragments have that an activity doesn’t?
Ans : Fragments also have onAttach() and onDetach() methods.
Q-4 : How recycler view works?
Ans : Google’s Documentation
Q-5 : continuing the previous one… What layouts the Adapter offer?
Ans : Linear Layout, Grid Layout and Staggered Layout
Q-6 : What are call back methods?
Ans ; The concept of callbacks is to inform a class synchronous / asynchronous if some work in another class is done. Some call it the Hollywood principle: “Don’t call us we call you. In simple words if a class needs to tell other class then it can be achieved by the callback method.
super method in many default methods are a callback method to the superclass of the aforementioned method.
Q-7 : What’s the difference between defining and declaring a variable?
Ans : Declaring a variable does not allocate the memory to the variable, it just states that the variable exists, whereas defining a variable also allocates the memory to the variable.
Q-8 : How to add and remove data from a List in android?
Ans : For adding elements dynamically, we should use ArrayList. It has pre-defined methods to add and remove data.
And then our interview ended with a Q&A round from my side.
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