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Android Developer Interview Questions
8,366 android developer interview questions shared by candidates
what's difference betweeen Rx-java and Coroutines
Questions were mostly regarding the architecture. Advantage of MVVM over MVP How to make the app secure in terms of server communication and decompile of apk
1- we are given two strings S and T consisting of N and M characters , respectively, and you would like to check whether they might have been obtained as OCR scans of the same text. for example, both strings "A2Le" and "2pl1" could have been obtained as scans of the word "Apple" (but also as scans of the word "Ample"). Both strings "a10" and "10a" could have been obtained as scans of the word "abbbbbbbbba" (but also from many other strings of length 11, starting and ending with "a") . on the other hand, string "ba1" and "1Ad" could not have been obtained from the same text since the second letter of each text is different. so for "A2Le" and "2pL1" we return true. for "a10" and "10a" we return true. for "ba1" and "1Ad" we return false. for "3x2x" and "8" we return false. 2- we have a function like this in java : public String solution(String S) { } String S is consisting of letters A, B, C, D. the string can be transformed either by removing a letter A together with an adjacent letter B , or by removing letter C together with an adjacent letter D . the function should return any string that can be obtained from S by repeatedly applying the described transformation to the point that cannot be further transformed. example 1 : given "CBACD" the function may return "C" . because one of the possible sequence would be : "CBACD" -> "CBA" -> "C" example 2: given "CABABD" the function may return an empty string because one of the possible sequence would be : "CABABD" -> "CABD" -> "CD" -> "" example 3 : "ACBDACBD" the function returns "ACBDACBD" because no operation can be applied to string S . the length of string is within the range of [0 .. 250000] 3- we have a function like this in kotlin : fun solution(A: IntArray, B: IntArray, X: Int, Y: Int): Int { } A and B are intArrays contain values within 1 to 100. values of A and B are coordinations like this (x,y) and they have the same length. the X and Y make one coordination like (X,Y). now if (X,Y) are in the range of +20 or -20 of any of the values in A and B return the index of that pair. example 1 : A = [100, 200, 100] , B = [50,100,100] , X=100 , Y = 70 the answer is 0 . example 2: A = [100,200,100] , B = [50,100,100] , X=100 , Y = 100 the answer is 2 .
MVVM Architecture , Kotlin, Compose and Android latest features
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Explain MVC with example. Why Recycler view? How IOT work ? IOT protocols and AWS configuration. Singleton pattern and how to make it thread safe. In which process service runs?
Arrays and follow up questions.
Mainly general android questions, but you need to be ready to show that you understand the topic and not just learnt "top 100 questions" from youtube. Plus in soft part need to handle well the conversation so you and the interviewers feel comfortable while talking about their experience/culture and telling about your experience, weak/good sides of you etc.
Few Questions on Java were asked which are as below- 1. Oops Concepts. 2. Print Prime Number 3. Array with vowels. 4. Fibo Program 5. Reverse a String Few Questions on Android were asked which are as below- 1.Activity and lifecycle of activity. 2.Fragment and lifecycle of Fragment. 3. Difference between two of them. 4. SharedPreferences. 5. Web Services (REST Api,SOAP).
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