I dare say that the vast majority of Android developers still don't know why performance optimization is needed!
This is definitely not an alarmist, I wonder if you have encountered such a situation in your usual development work:
I can't find the reason why these buttons work so slowly!
After many people happily wrote the function, they ran the test on the device and found that there was no problem, but the button " flyed slowly ", and the jump between the interfaces was not smooth enough , but the code looked and looked at the past. Didn't see anything wrong.
The performance optimization of Android development has always been forgotten by some people. Many startups basically do not conduct performance testing. They will pay more attention to functional testing and stability testing. However, in some small and medium-sized companies, some testers are more than enough. And lack of power. Performance optimization has always been one of the most frequently asked questions in interviews with large factories. If you want to enter a large factory, performance optimization is one of your essential skills.
Why do big manufacturers value performance optimization ?
There are many developers who have worked for a year or two and are still asking, is performance optimization really useful ? Some friends who work in small factories said that they have never done performance tuning, and they went online directly after testing, and there were no problems. So why do you need performance optimization?
As an Android development engineer, you need to solve various technical problems every day. Among them, performance optimization is one of the most technical tasks in Android development work, and it is also an essential skill for Android development engineers . Although performance optimization is easy to learn and easy to use, the vast majority of business development only stays at the stage of "heard of" or "simple use of tools" for performance optimization. If you want to understand performance optimization, it is not enough to use tools. You must have a thorough understanding of the underlying principles, such as: App startup speed optimization, memory optimization , UI fluency optimization, apk slimming, battery optimization, etc. The vast majority of them that are directly related to performance optimization are memory issues .
What is memory optimization?
What problems can occur if memory is not optimized? Take a look at the picture below
Memory churn occurs when a large number of objects are created and released immediately in a short period of time. A large number of objects generated in an instant will occupy a large amount of memory area. When the threshold is reached and the remaining space is not enough, the GC will be triggered, causing the newly generated objects to be recycled quickly.
Even though the objects allocated each time only take up a small amount of memory, they add up to increase the pressure on the Heap, causing other types of GCs to be triggered . At this time, the frame rate may be affected, so that the user perceives performance problems and brings a bad user experience.
Here is a list of some common memory problems in interviews:
- Difference between memory leak and memory overflow?
- How to avoid memory thrashing?
- Why does memory thrashing cause OOM?
- What are the reasons for OOM?
- The dangers of memory thrashing
- How to solve memory jitter?
Android memory optimization is a more important part of our performance optimization work, and it is also one of the most frequently asked questions in Android high-opening interviews. If you don’t understand memory optimization thoroughly, you will suffer technically, but you want to know more about performance optimization. Not so easy.
In order to help you better master performance optimization skills, here I share with you a " Android Performance Optimization - Full Analysis of Actual Combat " that took three months to sort out, from ANR, memory optimization, power consumption optimization, network optimization and other sections , to bring you a comprehensive analysis!
If you need to refer to the full version, please go to my GitHub for access .
GitHub地址：
https://github.com/733gh/Android-T3
In addition, this learning document basically includes all the relevant content of performance optimization, you can take a look through the catalog
It's superficial on paper, and I absolutely know that this matter needs to be implemented. I hope everyone can strengthen their performance optimization skills as soon as possible. This **"Android Performance Optimization - Full Analysis of Actual Combat"** will definitely help everyone, so that everyone can get started as soon as possible. Become a real advanced Android developer!