Android Interview Questions - Your Cheat Sheet For Android Interview
Tell all the Android application components. - Learn from here
What is the project structure of an Android Application? - Learn from here
What is Context? How is it used? - Learn from here
What is AndroidManifest.xml? - Learn from here
What is Application class?
What is Activity and its lifecycle? - Learn from here
What is the difference between onCreate() and onStart() - Learn from here
When only onDestroy is called for an activity without onPause() and onStop()? - Learn from here
Why do we need to call setContentView() in onCreate() of Activity class? - Learn from here
What is onSavedInstanceState() and onRestoreInstanceState() in activity?
What is Fragment and its lifecycle. - Learn from here
What are "launch modes"? - Learn from here
What is the difference between a Fragment and an Activity? Explain the relationship between the two. - Learn from here
When should you use a Fragment rather than an Activity?
What is the difference between FragmentPagerAdapter vs FragmentStatePagerAdapter?
What is the difference between adding/replacing fragment in backstack? - Learn from here
Why is it recommended to use only the default constructor to create a Fragment? - Learn from here
How would you communicate between two Fragments? - Learn from here
What is retained Fragment?
What is View in Android? - Learn from here
Difference between View.GONE and View.INVISIBLE? - Learn from here
Can you a create custom view? How? - Learn from here
What are ViewGroups and how they are different from the Views?
What is a Canvas? - Learn from here
What is a SurfaceView? - Learn from here
Relative Layout vs Linear Layout. - Learn from here
Tell about Constraint Layout - Learn from here
Do you know what is the view tree? How can you optimize its depth? - Learn from here
How does the Touch Control and Events work in Android? - Learn from here and here
What is the difference between ListView and RecyclerView? - Learn from here
How does RecyclerView work internally? - Learn from here and here
What is the ViewHolder pattern? Why should we use it? - Learn from here
What is SnapHelper? - Learn from here
What is Dialog in Android? - Learn from here
What is Toast in Android? - Learn from here
What the difference between Dialog and Dialog Fragment? - Learn from here
What is Intent? - Learn from here
What is an Implicit Intent? - Learn from here
What is an Explicit Intent? - Learn from here
What is a BroadcastReceiver? - Learn from here
What is a LocalBroadcastManager? - Learn from here
What is the function of an IntentFilter? - Learn from here
What is a Sticky Intent?
Describe how broadcasts and intents work to be able to pass messages around your app? - Learn from here
What is a PendingIntent?
What are the different types of Broadcasts? - Learn from here
What is Serivce? - Learn from here
Service vs IntentService. - Learn from here
What is a JobScheduler? - Learn from here
How can two distinct Android apps interact? - Learn from here
Is it possible to run an Android app in multiple processes? How? - Learn from here
What is AIDL? Enumerate the steps in creating a bounded service through AIDL. - Learn from here
What can you use for background processing in Android? - Learn from here
What is a ContentProvider and what is it typically used for? - Learn from here and here
How to run parallel tasks in Java or Android, and get callback when all complete? - Learn from here
Why should you avoid to run non-ui code on the main thread? - Learn from here
What is ANR? How can the ANR be prevented? - Learn from here
What is an AsyncTask? - Learn from here
What are the problems in AsyncTask? - Learn from here
When would you use java thread instead of an AsyncTask? - Learn from here
What is a Loader? (Deprecated) - Learn from here
What is the relationship between the life cycle of an AsyncTask and an Activity? What problems can this result in? How can these problems be avoided?
An AsyncTask is not tied to the life cycle of the Activity that contains it. So, for example, if you start an AsyncTask inside an Activity and the user rotates the device, the Activity will be destroyed (and a new Activity instance will be created) but the AsyncTask will not die but instead goes on living until it completes.
Then, when the AsyncTask does complete, rather than updating the UI of the new Activity, it updates the former instance of the Activity (i.e., the one in which it was created but that is not displayed anymore!). This can lead to an Exception (of the type java.lang.IllegalArgumentException: View not attached to window manager if you use, for instance, findViewById to retrieve a view inside the Activity).
There’s also the potential for this to result in a memory leak since the AsyncTask maintains a reference to the Activity, which prevents the Activity from being garbage collected as long as the AsyncTask remains alive.
For these reasons, using AsyncTasks for long-running background tasks is generally a bad idea . Rather, for long-running background tasks, a different mechanism (such as a service) should be employed.
Note: AsyncTasks by default run on a single thread using a serial executor, meaning it has only 1 thread and each task runs one after the other.
Explain Looper, Handler and HandlerThread. - Learn from here and from video
How does the threading work in Android? - Learn from here
Android Memory Leak and Garbage Collection - Learn from here
How do you handle bitmaps in Android as it takes too much memory? - Learn from here and here
What is the difference between a regular Bitmap and a nine-patch image?
Tell about the Bitmap pool. - Learn from here
How to play sounds in Android? - Learn from here
How image compression is preformed? - Learn from here
How to persist data in an Android app? - Learn from here
What is ORM? How does it work? - Learn from here
How would you preserve Activity state during a screen rotation? - Learn from here
What are different ways to store data in your Android app? - Learn from here
Explain Scoped Storage in Android. - Learn from here
How to encrypt data in Android? - Learn from here
What is commit() and apply() in SharedPreferences?
What is a Spannable? - Learn from here
What is a SpannableString?
What are the best practices for using text in Android? - Learn from here
How to implement Dark mode in any application? - Learn from here
How to generate dynamic colors based in image? - Learn from here
Explain about Density Independence Pixel - Learn from here
What is the onTrimMemory() method? - Learn from here
How does the OutOfMemory happens? - Learn from here
How do you find memory leaks in Android applications? - Learn from here and here
How to reduce battery usage in an android application? - Learn from here
What is Doze? What about App Standby? - Learn from here
What is overdraw? - Learn from here
What is the NDK and why is it useful? - Learn from here and here and here
What is renderscript? - Learn from here
What is the Dalvik Virtual Machine? - Learn from here
What is the difference JVM, DVM and ART? - Learn from here
What are the differences between Dalvik and ART? - Learn from here
What is DEX? - Learn from here
Can you manually call the Garbage collector? - Learn from here
What is Android Jetpack and why to use this? - Learn from here
What are Android Architecture Components? - Learn from here
What is LiveData in Android? - Learn from here
How LiveData is different from ObservableField? - Learn from here
What is the difference between setValue and postValue in LiveData? - Learn from here
How to share ViewModel between Fragments in Android? - Learn from here
Explain Work Manager in Android. - Learn from here
Use-cases of WorkManager in Android. - Learn from here
Why Bundle class is used for data passing and why cannot we use simple Map data structure? - Learn from here
How do you troubleshoot a crashing application? - Learn from here
Explain Android notification system? - Learn from here
What is the difference between Serializable and Parcelable? Which is the best approach in Android? - Learn from here
What is AAPT? - Learn from here
What is the best way to update the screen periodically? - Learn from here
FlatBuffers vs JSON. - Learn from here
HashMap, ArrayMap and SparseArray - Learn from here
What are Annotations? - Learn from here, Link, and from video
How to create custom Annotation? - Learn from here and here
How to handle multi-touch in android? - Learn from here
How to implement XML namespaces? - Learn from here
What is the support library? Why was it introduced? - Learn from here
What is Android Data Binding? - Learn from here
How to check if Software keyboard is visible or not? - Learn from here
How to take screenshot in Android programmatically? - Learn from here
Explain OkHttp Interceptor - Learn from here
OkHttp - HTTP Caching - How caching work in Android - Learn from here
Tell me something about RxJava. - Learn from here
How will you handle error in RxJava? - Learn from here
FlatMap Vs Map Operator - Learn from here
When to use Create operator and when to use fromCallable operator of RxJava? - Learn from here
When to use defer operator of RxJava? - Learn from here
How are Timer, Delay, and Interval operators used in RxJava? - Learn from here
How to make two network calls in parallel using RxJava? - Learn from here
Tell the difference between Concat and Merge. - Learn from here
Explain Subject in RxJava? - Learn from here
What are the types of Observables in RxJava? - Learn from here
How to implement EventBus with RxJava? - Learn from here
How to implement search feature using RxJava in your application? - Learn from here
How The Android Image Loading Library Glide and Fresco Works? - Learn from here
Difference between Schedulers.io() and Schedulers.computation() in RxJava.
Why do we use the Dependency Injection Framework like Dagger in Android? - Learn from here
How does the Dagger work? - Learn from here and here
What is Component in Dagger? - Learn from here
What is Module in Dagger? - Learn from here
How does the custom scope work in Dagger?
When to call dispose and clear on CompositeDisposable in RxJava? - Learn from here
What is Multipart Request in Networking? - Learn from here
What is Flow in Kotlin? - Learn from here
Describe the architecture of your last app.
Describe MVP. - Learn from here
Describe MVVM. - Learn from here and here
MVC vs MVP vs MVVM architecture. - Learn from here
What is presenter? - Learn from here
What is model? - Learn from here
Describe MVC. - Learn from here
Describe MVI - Learn from here
Describe the repository pattern - Learn from here
What is controller? - Learn from here
Tell something about clean code - Learn from here
Design Uber App. - Learn from here
Design Facebook App.
Design Facebook Near-By Friends App.
Design WhatsApp.
Design SnapChat.
Design problems based on location based app.
How to build offline-first app? Explain the architecture.
Design LRU Cache.
Design File Downloader - Lear from here
HTTP Request vs HTTP Long-Polling vs WebSockets - Lear from here
What is Espresso? - Learn from here
What is Robolectric? - Learn from here
What are the disadvantages of using Robolectric? - Learn from here
What is UI-Automator? - Learn from here
Explain unit test. - Learn from here
Explain instrumented test. - Learn from here
Have you done unit testing or automatic testing?
Why Mockito is used? - Learn from here
Describe JUnit test. - Learn from here
Describe code coverage. - Learn from here
What is ADB? - Learn from here
What is DDMS and what can you do with it? - Learn from here
What is the StrictMode? - Learn from here
What is Lint? What is it used for? - Learn from here
Git. - Learn from here
Android Development Useful Tools. - Learn from here
Firebase. - Learn from here
How to measure method execution time in Android? - Learn from here
Can you access your database of SQLite Database for debugging? - Learn from here
What are things that we need to take care while using Proguard? - Learn from here
What is Multidex in Android? - Learn from here
How to use Android Studio Memory Profiler? - Learn from here
How to use Firebase realtime database in your app? - Learn from here
What is Gradle? - Learn from here
APK Size Reduction. - Learn from here and here
How can you speed up the Gradle build? - Learn from here
About gradle build system. - Learn from here
About multiple apk for android application. - Learn from here
What is proguard used for? - Learn from here
What is obfuscation? What is it used for? What about minification? - Learn from here
How to change some parameters in an app without app update? - Learn from here
Explain OOP Concepts.
What is the difference between a constructor and a method?
The name of the constructor is same as that of the class name, whereas the name of the method can be anything.
There is no return type of a constructor.
When you make an object of a class, then the constructor of that class will be called automatically. But for methods, we need to call it explicitely.
Constructors can't be inherited but you can call the constructor of the parent class by calling super().
Constructor and a method they both run a block of code but the difference is in calling them.
We can call method directly using their name.
Constructor Syntax -
public class SomeClassName{
SomeClassName(parameter_list){
...
}
...
}Note: In the above syntax, the name of the constructor is the same as that of class and it has no return type.
Method Syntax
public class SomeClassName{
public void someMethodName(parameter_list){
...
}
// call method
someMethodName(parameter_list)
}Differences between abstract classes and interfaces?
What is the difference between iterator and enumeration in java?
Do you agree we use composition over inheritance? Learn from here
Difference between method overloading and overriding.
Static methods can be overloaded which means a class can have more than one static method of same name. Static methods cannot be overridden, even if you declare a same static method in child class it has nothing to do with the same method of parent class as overridden static methods are chosen by the reference class and not by the class of the object.
So, for example:
public class Animal {
public static void testClassMethod() {
System.out.println("The static method in Animal");
}
public void testInstanceMethod() {
System.out.println("The instance method in Animal");
}
}
public class Cat extends Animal {
public static void testClassMethod() {
System.out.println("The static method in Cat");
}
public void testInstanceMethod() {
System.out.println("The instance method in Cat");
}
public static void main(String[] args) {
Cat myCat = new Cat();
myCat.testClassMethod();
Animal myAnimal = myCat;
myAnimal.testClassMethod();
myAnimal.testInstanceMethod();
}
}Will output:
The static method in Cat // testClassMethod() is called from "Cat" reference
The static method in Animal // testClassMethod() is called from "Animal" reference,
// ignoring actual object inside it (Cat)
The instance method in Cat // testInstanceMethod() is called from "Animal" reference,
// but from "Cat" object underneathThe most basic difference is that overloading is being done in the same class while for overriding base and child classes are required. Overriding is all about giving a specific implementation to the inherited method of parent class.
Static binding is being used for overloaded methods and dynamic binding is being used for overridden/overriding methods. Performance: Overloading gives better performance compared to overriding. The reason is that the binding of overridden methods is being done at runtime.
Private and final methods can be overloaded but they cannot be overridden. It means a class can have more than one private/final methods of same name but a child class cannot override the private/final methods of their base class.
Return type of method does not matter in case of method overloading, it can be same or different. However in case of method overriding the overriding method can have more specific return type (meaning if, for example, base method returns an instance of Number class, all overriding methods can return any class that is extended from Number, but not a class that is higher in the hierarchy, like, for example, Object is in this particular case).
Argument list should be different while doing method overloading. Argument list should be same in method Overriding.
It is also a good practice to annotate overridden methods with @Override to make the compiler be able to notify you if child is, indeed, overriding parent's class method during compile-time.
What are the access modifiers you know? What does each one do?
private variables, methods, constructors or inner classes are only visible to its' containing class and its' methods. This modifier is most commonly used, for example, to allow variable access only through getters and setters or to hide underlying implementation of classes that should not be used by user and therefore maintain encapsulation. Singleton constructor is also marked private to avoid unwanted instantiation from outside.Default (no keyword is used) this modifier can be applied to classes, variables, constructors and methods and allows access from classes and methods inside the same package.protected can be used on variables, methods and constructors therefore allowing access only to subclasses and classes that are inside the same package as protected members' class.public modifier is widely-used on classes, variables, constructors and methods to grant access from any class and method anywhere. It should not be used everywhere as it implies that data marked with public is not sensitive and can not be used to harm the program.Can an Interface implement another Interface?
extends, rather than implements keyword. And while you can not remove methods from parent interface, you can add new ones freely to your sub-interface.What is Polymorphism? What about Inheritance?
An important example of polymorphism is how a parent class refers to a child class object. In fact, any object that satisfies more than one IS-A relationship is polymorphic in nature.
For instance, let’s consider a class Animal and let Cat be a subclass of Animal. So, any cat IS animal. Here, Cat satisfies the IS-A relationship for its own type as well as its super class Animal.
The class which inherits the properties of other is known as subclass (derived class, child class) and the class whose properties are inherited is known as superclass (base class, parent class).
Inheritance uses the keyword extends to inherit the properties of a class. Following is the syntax of extends keyword.
class Super {
.....
.....
}
class Sub extends Super {
.....
.....
}Multiple inheritance in Classes and Interfaces in java Learn from here
What are the design patterns? Learn from here
Arrays Vs ArrayLists - Learn from here and here
HashSet Vs TreeSet - Learn from here
HashMap Vs Set - Learn from here
Stack Vs Queue - Learn from here
Explain Generics in Java?
Generics were included in Java language to provide stronger type checks, by allowing the programmer to define, which classes can be used with other classes
In a nutshell, generics enable types (classes and interfaces) to be parameters when defining classes, interfaces and methods. Much like the more familiar formal parameters used in method declarations, type parameters provide a way for you to re-use the same code with different inputs. The difference is that the inputs to formal parameters are values, while the inputs to type parameters are types. (Official Java Documentation)
This means that, for example, you can define:
List<Integer> list = new ArrayList<>();And let the compiler take care of noticing, if you put some object, of type other than Integer into this list and warn you.
It should be noted that standard class hierarchy does not apply to generic types. It means that Integer in List<Integer> is not inherited from <Number> - it is actually inherited directly from <Object>. You can still put some constraints on what classes can be passed as a parameter into a generic by using wildcards like <?>, <? extends MyCustomClass> or <? super Number>.
While generics are very useful, late inclusion into Java language has put some restraints on their implementation - backward compatibility required them to remain just "syntactic sugar" - they are erased (type erasure) during compile-time and replaced with object class.
What is Java PriorityQueue?
How is String class implemented? Why was it made immutable?
String class in Java language - all strings are just wrappers around underlying array of characters, which is declared final. This means that, once a String object is instantiated, it cannot be changed through normal tools of the language (Reflection still can mess things up horribly, because in Java no object is truly immutable). This is why String variables in classes are the first candidates to be used, when you want to override hashCode() and equals() of your class - you can be sure, that all their required contracts will be satisfied.
Note: The String class is immutable, so that once it is created a String object cannot be changed. The String class has a number of methods, some of which will be discussed below, that appear to modify strings. Since strings are immutable, what these methods really do is create and return a new string that contains the result of the operation. (Official Java Documentation)
This class is also unique in a sense, that, when you create an instance like this:
String helloWorld = "Hello, World!";"Hello, World!" is called a literal and compiler creates a String object with its' value. So
String capital = "Hello, World!".toUpperCase();is a valid statement, that, firstly, will create an object with literal value "Hello, World!" and then will create and return another object with value "HELLO, WORLD!"
String was made immutable to prevent malicious manipulation of data, when, for example, user login or other sensitive data is being send to a server.What does it means to say that a String is immutable?
String object's char[] (its' containing value) is declared final and, therefore, it can not be changed during runtime.What is String.intern()? When and why should it be used?
String.intern() is used to mange memory in Java code. It is used when we have duplicates value in different strings. When you call the String.intern(), then if in the String pool that string is present then the equals() method will return true and it will return that string only.Can you list 8 primitive types in java?
byteshortintlongfloatdoublecharStringbooleanWhat is the difference between an Integer and int?
int is a primitive data type (with boolean, byte, char, short, long, float and double), while Integer (with Boolean, Byte, Character, Short,Long, Float and Double) is a wrapper class that encapsulates primitive data type, while providing useful methods to perform different tasks with it.What is Autoboxing and Unboxing?
int and Integer can (almost always) be used interchangeably in Java language, meaning a method void giveMeInt(int i) { ... } can take int as well as Integer as a parameter.Typecast in Java
long i = 10l;
int j = (int) i;
long k = j;Here we see, that, while narrowing (long i -> int j) requires an explicit cast to make sure the programmer realizes, that there may be some data or precision loss, widening (int j -> long k) does not require an explicit cast, because there can be no data loss (long can take larger numbers than int allows).
Do objects get passed by reference or value in Java? Elaborate on that.
In Java all primitives and objects are passed by value, meaning that their copy will be manipulated in the receiving method. But there is a caveat - when you pass an object reference into a method, a copy of this reference is made, so it still points to the same object. This means, that any changes that you make to the insides of this object are retained, when the method exits.
public class Pointer {
int innerField;
public Pointer(int a) {
this.innerField = a;
}
}public class ValueAndReference {
public static void main(String[] args) {
Pointer a = new Pointer(0);
int b = 1;
print("Before:");
print("b = " + b);
print("a.innerField = " + a.innerField);
exampleMethod(a, b);
print("After:");
print("b = " + b);
print("a.innerField = " + a.innerField);
}
static void exampleMethod(Pointer a, int b) {
a.innerField = 2;
b = 10;
}
static void print(String text) {
System.out.println(text);
}
}Will output:
Before:
b = 1
a.innerField = 0
After:
b = 1 // a new local int variable was created and operated on, so "b" didn't change
a.innerField = 2 // Pointer a got its' innerField variable changed
// from 0 to 2, because method was operating on
// the same reference to an instanceWhat is the difference between instantiation and initialization of an object? - Learn from here
What the difference between local, instance and class variables?
static - because they only exist during enclosing method's execution and those modifiers just do not make sense, since no other outside method can get them anyway.static keyword in their class' body. They can only have one value across all instances of that class (changing it in one place will change it in their class and, therefore, in all instances) and can even be retrieved without that class' instance (if their access modifier allows it).What is garbage collector? How does it work?
What is Java Memory Model? What contracts does it guarantee? How are its' Heap and Stack organized? - Learn from here
What is memory leak and how does Java handle it? - Learn from here
What are strong, soft, weak and phantom references in Java? - Learn from here
What does the keyword synchronized mean? Learn from here
What is a ThreadPoolExecutor? Learn from here
What is volatile modifier? Learn from here
The classes in the atomic package expose a common set of methods: get, set,, lazyset, compareAndSet, and weakCompareAndSet. Please describe them.
How does the try{}, catch{}, finally works? - Learn from here
What is the difference between a Checked Exception and an Un-Checked Exception? - Learn from here
What is serialization? How do you implement it?
To use Serializable all you have to do is implement the interface:
/**
* Implementing the Serializable interface is all that is required
*/
public class User implements Serializable {
private String name;
private String email;
public User() {
}
public String getName() {
return name;
}
public void setName(final String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(final String email) {
this.email = email;
}
}Parcelable requires a bit more work:
public class User implements Parcelable {
private String name;
private String email;
/**
* Interface that must be implemented and provided as a public CREATOR field
* that generates instances of your Parcelable class from a Parcel.
*/
public static final Creator<User> CREATOR = new Creator<User>() {
/**
* Creates a new USer object from the Parcel. This is the reason why
* the constructor that takes a Parcel is needed.
*/
@Override
public User createFromParcel(Parcel in) {
return new User(in);
}
/**
* Create a new array of the Parcelable class.
* @return an array of the Parcelable class,
* with every entry initialized to null.
*/
@Override
public User[] newArray(int size) {
return new User[size];
}
};
public User() {
}
/**
* Parcel overloaded constructor required for
* Parcelable implementation used in the CREATOR
*/
private User(Parcel in) {
name = in.readString();
email = in.readString();
}
public String getName() {
return name;
}
public void setName(final String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(final String email) {
this.email = email;
}
@Override
public int describeContents() {
return 0;
}
/**
* This is where the parcel is performed.
*/
@Override
public void writeToParcel(final Parcel parcel, final int i) {
parcel.writeString(name);
parcel.writeString(email);
}
}Note: For a full explanation of the describeContents() method see StackOverflow. In Android Studio, you can have all of the parcelable code auto generated for you, but like with everything else, it is always a good thing to try and understand everything that is happening.
What is transient modifier? Learn from here
What are anonymous classes? Learn from here
What is the difference between using == and .equals on an object? - Learn from here
What is the hashCode() and equals() used for? - Learn from here
Why would you not call abstract method in constructor? - Learn from here
When would you make an object value final?
What are these final, finally and finalize keywords?
final is a keyword in the java language. It is used to apply restrictions on class, method and variable. Final class can't be inherited, final method can't be overridden and final variable value can't be changed.
class FinalExample {
public static void main(String[] args) {
final int x=100;
x=200;//Compile Time Error because x is final
}
}finally is a code block and is used to place important code, it will be executed whether exception is handled or not.
class FinallyExample {
public static void main(String[] args) {
try {
int x=300;
}catch(Exception e) {
System.out.println(e.getMessage()); }
finally {
System.out.println("finally block is executed");
}
}
}Finalize is a method used to perform clean up processing just before object is garbage collected.
class FinalizeExample {
public void finalize() {
System.out.println("finalize called");
}
public static void main(String[] args) {
FinalizeExample f1=new FinalizeExample();
FinalizeExample f2=new FinalizeExample();
f1=null;
f2=null;
System.gc();
}
}What is the difference between "throw" and "throws" keyword in Java?
throws is just used to indicated which exception is to be thrown. But the throw keyword is used to throw some exception from any static block or any method.What does the static word mean in Java?
static variable it means that this variable (its' value or the object it references) spans across all instances of enclosing class (changing it in one instance affects all others), while in case of static methods it means that these methods can be invoked without an instance of their enclosing class. It is useful, for example, when you create util classes that need not be instantiated every time you want to use them.Can a static method be overridden in Java?
When is a static block run?
What is reflection?
What is Dependency Injection? Learn from here
How is a StringBuilder implemented to avoid the immutable string allocation problem? - Learn from here
Difference between StringBuffer and StringBuilder? - Learn from here
What is the difference between fail-fast and fail-safe iterators in Java?
What is Java NIO? - Learn from here
Monitor and Synchronization - Learn from here
Tell some advantages of Kotlin. - Learn from here
What is the difference between val and var? - Learn from here
What is the difference between const and val? - Learn from here
How to ensure null safety in Kotlin? - Learn from here
When to use lateint keyword used in Kotlin? - Learn from here
How to check if a lateinit variable has been initialized? - Learn from here
How to do lazy initialization of variables in Kotlin? - Learn from here and here
What are companion objects in Kotlin? - Learn from here
What are the visibility modifiers in Kotlin? - Learn from here
What is the equivalent of Java static methods in Kotlin? - Learn from here
What is a data class in Kotlin? - Learn from here
How to create a Singleton class in Kotlin? - Learn from here
What is the difference between open and public in Kotlin? - Learn from here
Explain the use-case of let, run, with, also, apply in Kotlin. - Learn from here and here
Difference between List and Array types in Kotlin - Learn from here
What are Labels in Kotlin? - Learn from here
What is an Init block in Kotlin? - Learn from here
Explain pair and triple in Kotlin. - Learn from here
How to choose between apply and with? - Learn from here
How to choose between switch with when? - Learn from here
What are Coroutines in Kotlin? - Learn from here
What is Coroutine Scope? - Learn from here
What is Coroutine Context? - Learn from here
Launch vs Async in Kotlin Coroutines - Learn from here
What is inline function in Kotlin? - Learn from here
When to use Kotlin sealed classes? - Learn from here
Explain function literals with receiver in Kotlin? - Learn from here
Tell about Kotlin DSL. - Learn from here
What are higher-order functions in Kotlin? - Learn from here
What are Lambdas in Kotlin - Learn from here
Tell about the Collections in Kotlin - Learn from here
The level of questions asked on the topic of Data Structures And Algorithms totally depends on the company for which you are applying.
Complexity Analysis - Learn from here
Iteration and Two Pointer Approach - Learn from here
Recursion and Divide & Conquer Approach - Learn from here
Arrays and Linked List - Learn from here
Stack and Queue - Learn from here
Sorting Algorithms - Wikipedia
| Time Complexity | Space Complexity | ||
|---|---|---|---|
| Best | Average | Worst | Worst |
| Ω(n) | Θ(n^2) | O(n^2) | O(1) |
| Time Complexity | Space Complexity | ||
|---|---|---|---|
| Best | Average | Worst | Worst |
| Ω(n^2) | Θ(n^2) | O(n^2) | O(1) |
| Time Complexity | Space Complexity | ||
|---|---|---|---|
| Best | Average | Worst | Worst |
| Ω(n) | Θ(n^2) | O(n^2) | O(1) |
| Time Complexity | Space Complexity | ||
|---|---|---|---|
| Best | Average | Worst | Worst |
| Ω(n log(n)) | Θ(n log(n)) | O(n log(n)) | O(n) |
| Time Complexity | Space Complexity | ||
|---|---|---|---|
| Best | Average | Worst | Worst |
| Ω(n log(n)) | Θ(n log(n)) | O(n^2) | O(n) |
Binary Tree - Learn from here
Binary Search Tree - Learn from here
Heap and Priority Queue - Learn from here
Hash Table - Learn from here
Dynamic Programming - Learn from here
Greedy Algorithms - Learn from here
Backtracking - Learn from here
Graph - Learn from here
Describe how REST APIs work. What is REST? - Learn from here and here
Describe SQLite. - Learn from here and here
Describe database. - Learn from here
How do you control the application version update to specific number of users?
Can we identify users who have uninstalled our application?
Android Development Best Practices. - Learn from here
Android Code Style And Guidelines. - Learn from here
Have you tried Kotlin? - Learn from here
What are the metrics that you should measure continuously while android application development? - Learn from here
What is Chrome Custom Tabs? How to display web content in your app? - Learn from here
How to avoid API keys from check-in into VCS? - Learn from here
How does the Kotlin Multiplatform work? - Learn from here
How to use Memory Heap Dumps data? - Learn from here
How to implement Dark Theme in your app? - Learn from here
Have you tried Jetpack compose? - Learn from here
How to secure the API keys used in an app? - Learn from here
How to convert check Java equivalent code of Kotlin? - Learn from here
Tell something about memory usage in Android. - Learn from here
What is Benchmarking? - Learn from here
Can you create transparent activity in Android? - Learn from here
How to use Android Sensors? - Learn from here
Explain Annotation processing. - Learn from here
How to increase the Notification delivery rate? Learn from here
How does the notification system work? Learn from here
How to show local Notification at an exact time? Learn from here
Check out MindOrks awesome open source projects here
Copyright (C) 2020 MINDORKS NEXTGEN PRIVATE LIMITED
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.Just make pull request. You are in!