From basic to advanced architecture, including Tencent, Baidu, Xiaomi, Alibaba, LeTV, Meituan, 58, Cheetah, 360, Sina, Sohu and other first-line Internet companies interview questions asked, covering junior high school advanced Android technology points.
The main part listed in the article is the outline part, and the details can be obtained by yourself at the end of the article!
If you are proficient in the knowledge points listed in this article, I believe it will greatly increase your chances of passing the first two rounds of technical interviews! These contents are for your reference and learn from each other.
Interview summary
You must be fully prepared for interviews with big companies. Going to the interview without preparation is completely a cannon fodder, and you are not responsible for yourself. Then the foundation is really important. Basics, foundations, foundations, and important things are said three times.
Let me share with you some of the interview questions and analysis that I reviewed before the interview with Meituan, mainly the interview questions frequently asked by big companies such as Bytedance, Ali, Tencent, Meituan, and Pinduoduo. You can check this to fill in the gaps. Of course, the list here is definitely not able to cover all, but I also hope to help friends who are about to find a job!
One, Handler related knowledge
1. What is the relationship between Handler Looper Message?
2. What is the data structure of Messagequeue? Why use this data structure?
3. How to create Handler in the child thread?
4. Principle of Handler post method?
5. Principle and source code analysis
of Android message mechanism 6. Android message mechanism
...
Two, Activity related
1. Common usage scenarios of the four activation modes of Activity
2. onNewIntent() and onConfigurationChanged()
3. onSaveInstanceState() and onRestoreInstanceState ()
4. How does Activity start?
5. What is zygote? what's the effect?
6. What is SystemServer? what's the effect? What is its relationship with zygote?
7. What is ActivityManagerService? When was it initialized? what's the effect?
…
### Due to the length of the article, it is impossible to display all the interview questions in text form. Some interview questions are selected for everyone in the article. Friends in need can get them directly at the end of the article.
Three, Fragment
1. Comparison of Fragment and Life Cycle and Activity
2. How to communicate between Fragment
3. StartActivityForResult
of Fragment 4. Fragment overlap problem
5. Fragment rollback stack management
6. Fragment and Activity communication
7. Fragment and ActionBar and MenuItem
8. Fragment without layout—save a lot of data
9. Use of DialogFragment
10. StartActivityForResult of Fragment
...
Four, Service related
1. Process keep alive
2. Service running thread (all life cycle methods are in the main thread)
3. Service startup method and how to stop
4. On which thread does the callback method in ServiceConnection run?
…
###Five, Android layout optimization ViewStub, include, merge
1. Under what circumstances should I use ViewStub, include, merge?
2. What is their principle?
3. Layout optimization artifacts include, merge, and ViewStub tags in detail
…
Six, Kotlin related
1. Analyze Kotlin's delayed initialization from the principle: lateinit var and by lazy
2. From Java To Kotlin
3. How to use Kotlin to improve productivity: Kotlin Tips
4. Use Kotlin Reified to make generics simpler and safer
5. Extension Functions in Kotlin Implementation principle analysis
6. Top-level functions and attributes of the Kotlin series
7. The biggest "pit" that Kotlin is compatible with Java
8. Kotlin's coroutine
9. The essence of Kotlin's coroutine "hanging"
...
###Due to the limitation of article length , It is impossible to display all the interview questions in text form. Some interview questions are selected for everyone in the article. Friends in need can get them directly at the end of the article.
Seven, Flutter related
1. What does the "..." in Dart mean?
2. The scope
of Dart 3. Is Dart a single-threaded model? How does it work
4. How does Dart implement multitasking in parallel?
5. What about the Future keyword in Dart asynchronous programming?
6. Talk about the Stream data flow in Dart asynchronous programming?
7. What are the two subscription modes for Stream? How are they called?
8. How to use await for?
9. Tell me about the mixin mechanism?
10. Please briefly introduce the Flutter framework and its advantages and disadvantages?
11. Introduce the conceptual architecture of Flutter.
12. Introduce the FrameWork layer and Engine layer of FFlutter, and their roles.
13. Introduce the concepts of Widget, State and Context.
14. Briefly describe the StatelessWidget and StatefulWidget of Widget.
…
8. Java related
1. HashMap
2. ArrayList
3. LinkedList
4. Hashset source code analysis
5. Memory model
6. Garbage collection algorithm (JVM)
7. The difference between garbage collection mechanism and calling System.gc()?
8. Class loading process
9, reflection
10, multi-threading and thread pool
11, HTTP, HTTPS, TCP/IP, Socket communication, three-way handshake and four waved hands
12. Design patterns (six basic principles, commonly used design patterns in projects , Handwritten singleton, etc.)
13, breakpoint resuming
14, Java four major references
15, Java generic
16, final, finally, finalize difference
17, interface, abstract class difference...
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In 2013, the author switched to Java for Android development. He has been in a small factory, and has also been to a large factory such as Huawei and OPPO. In April 18th, he joined Ali until now.
I have been interviewed and interviewed many people. I know that most junior and intermediate Android engineers want to improve their skills. They often grow up on their own. The unsystematic learning effect is inefficient and long, and it is easy to encounter the ceiling technology stagnation!
We have compiled a complete set of learning materials for Alibaba P7-level Android architects, which are especially suitable for in-depth learning and improvement for small partners with more than 3-5 years of experience.
Mainly include Tencent, and Bytedance, Ali, Huawei, Xiaomi, and other mainstream Internet companies such as mainstream architecture technologies. If you need it, just take it away.
If you feel that your learning efficiency is low and you lack correct guidance, you can click to join the technical circle with rich resources and strong learning atmosphere to learn and communicate together !
There are many first-line technical experts in the group, as well as code farmers who are working in small factories or outsourcing companies. We are committed to creating an equal and high-quality Android communication circle. It may not be possible to make everyone’s technology advance by leaps and bounds in the short term. In the long run, vision, pattern, and long-term development direction are the most important.
The 35-year-old middle-aged crisis is mostly caused by being led by short-term interests and squeezing out value prematurely. If you can establish a correct long-term career plan from the beginning. After 35, you will only be more valuable than the people around you.
The large number of Android communication circles may not make everyone's technology advance by leaps and bounds in the short term, but in the long run, the vision, the pattern, and the long-term development direction are the most important.
The 35-year-old middle-aged crisis is mostly caused by being led by short-term interests and squeezing out value prematurely. If you can establish a correct long-term career plan from the beginning. After 35, you will only be more valuable than the people around you.