Gold in March and silver in April, coming back from the New Year is the peak period for job-hopping. The restless editor also voted for a few companies, wanting to change jobs and environment. In the past two weeks, I have interviewed four companies, and now I will organize the interview content and share it with you.
A well-known online education company
- Comparison of several mainstream players such as VideoView, ExoPlayer, IjkPlayer and Vitamio;
- Garbage collection mechanism, JVM memory allocation, how to determine object recyclable;
- Algorithm: find the largest 10 numbers among n (very large) unordered numbers;
- Talk about memory optimization;
- How to decompile and reversely analyze the code;
- Customize the View process, the main methods and their respective functions;
- How to prevent overdrawing;
- LruCache principle;
- Event distribution and examples;
- Which frameworks have been used for hybrid development, and how did they handle and encapsulate them;
- Introduce an open source framework and principles you know;
- Talk about your understanding of http caching.
A well-known online question and answer community
- The reason why the number of methods in Android cannot exceed 64k, and how to deal with it;
- Is there a size limit for the value of Intent, why, and how to deal with it;
- How to implement a circular ImageView;
- Talk about the role of dynamic proxy;
- annotation;
- perform or calculate numbers;
- Detailed introduction and use of the onMesurse method in View;
- How to implement the side sliding deletion of RecyclerView by yourself;
- How to make the current label always in the middle of the screen in TabLayout;
- garbage collection mechanism;
- Life cycle problems when Activity jumps;
- Principles of LruCache and DisLruCache;
- EventBus principle;
- The parameters and working principle of the thread pool;
- How to use js intermodulation and what optimization has been done;
- Algorithm: Merge Sort
A well-known live broadcast platform
- Handwritten code: traverse the file directory;
- Algorithm analysis of elevator operation;
- Talk about the structure of your own project and how to optimize it;
- Algorithm: handwritten bubble sort;
- ijkPlayer player source code;
- How to handle the gesture control of the video player;
- The difference between ArrayList, Vector, and LinkedList;
- What problems have you encountered with Fragment?
- Image processing and optimization;
- Several ways for Android to implement asynchronous;
- JVM garbage collection mechanism;
- How to perform performance analysis on Android applications;
- Introduce an app or open source framework that you appreciate.
A well-known video playback company
- Customize the View process;
- The advantages and exact points of MVP;
- Parent delegation of ClassLoader;
- Handwritten implementation of get operation of singly linked list;
- What plug-in solutions have been used?
- Image processing and caching;
- Producer and consumer model;
- How to optimize the performance of the application;
- The reasons for the occurrence of 64k and how to solve them;
- Awareness of ART;
- The role of dynamic agents;
- Source code analysis of Retrofit and EventBus;
- How EventBus is sent sticky;
- TextView calls the internal execution process of the setText method;
- Knowledge of the thread pool and its several subclasses;
Luckily, the editor got two offers from them (I won't disclose it specifically).
From the interview experience in the past few days, I have a few impressions:
Interviews with large factories generally do not ask how a specific function is implemented;
The big factory pays more attention to the foundation;
Data structures and algorithms are really very important and are the basis of daily work and interviews;
We should look at the source code more and understand the internal process, not just stay in the know-how;
I would like to share with you the contents and impressions of the interview in the past two weeks, hoping to be helpful to you.
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