Essential performance optimization topics in the interview~

The mobile application market is highly competitive , The performance of an application has become an important standard for evaluating an application , Therefore, now the market has higher and higher requirements for developers . Will the app performance tuning , It has also become an important assessment standard for enterprises to recruit excellent programmers .Android In the interview of development 95% Will ask questions about performance optimization （ The rest 5% I'm a junior intern ）

Performance tuning is Android The importance of interview is self-evident ., Now let's show you about Android performance optimization , What questions do interviewers like to ask ！

One 、 Memory optimization

Memory optimization is one of the most important optimization points in performance optimization , so to speak , If you don't master the memory optimization scheme of the system , You can't say you're right Android There is too much research and Exploration on the performance optimization of .

About memory , What do interviewers like to ask most ？ Let's test ourselves

1、 Why is it official advice not to onDraw Create objects ？
2、 Why does memory jitter cause program jams and OOM？
3、 Causes of memory leakage and troubleshooting plan ？
4、GC How to recycle objects ？ How to determine whether an object can be recycled ？

Two 、OOM Problems and LeakCanary principle

** Stability is App The most basic and critical link in the quality construction system ,** If our App unstable , And often can't provide services normally , Such as a crash , Then the user will probably uninstall it .

About OOM problem , What do interviewers like to ask most ？ We also test ourselves

1、OOM How did it happen ？
2、 How to quickly solve OOM problem ？
3、leakCanary How to discover OOM Of ？
4、LeakCanary principle ？
5、 In common Crash On the problem list ,OOM Why is it among the best and enduring ？

3、 ... and 、UI Sliding Caton problem

UI Fluency is also APP An important part of performance , Imagine you with OCD , Can stand you 5000 Does the mobile phone you bought for yuan draw card by card ？

About UI Caton's optimization problem , What do interviewers like to ask most ？ Let's test ourselves again

1、UI What are the reasons for carton ？
2、UI In structure fragment Caching principle ？
3、MeasureSpec Principle ？
4、 Customize View Of measure What is the timing , Why is it that the parameter value is 0, Sometimes right ？

The knowledge points of performance optimization will not be so rigid in the actual interview , There will be many changes , The above content I just give you chestnuts , I really want to understand the content of this piece , There is still a lot to know , Here's a whole for you Android performance optimization Learning mind map , You can study it well .

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For each knowledge point, a set of very systematic learning notes has been sorted out PDF, Modular learning resources , According to each module in the roadmap , I have sorted out the corresponding learning documents , Very comprehensive and meticulous ！《 Big factory APP Performance analysis and optimization of actual combat scheme 》（ Startup optimization 、UI Rendering optimization 、 Crash optimization 、 Memory optimization 、 Carton optimization 、 Storage optimization 、 network optimization 、 Power consumption optimization 、 Multithreading concurrent optimization 、 Installation package optimization, etc ） If you need a partner, you can Click here to view the acquisition method The portal goes straight to ！！！