How can Android developers improve themselves?
Talk about my two suggestions:
1. Horizontal development: (suitable for people with their own expertise)
While delving into the field of your expertise, besides Hybrid development (Flutter, RN, H5), web development, WeChat applet, etc., you will not have to worry about finding a job in 5 years. However, this is really difficult. The whole stack is easy to develop into a whole dish, that is, you know everything, but you are not refined!
2. Vertical development : (suitable for most people)
If you do application development, you will develop in the direction of application architecture; if you do system-level development, you will delve into the underlying drivers.
You can learn from the following aspects:
Mobile architecture :
Architecture display layer: MVC, MVP, MVVM, Android Architecture Components;
Architecture layer: Modularization->Componentization->Pluginization->Sandbox/Double Open Technology;
Basic advanced:
Such as advanced custom View, Android Framework layer principle, App management mechanism, etc.;
JNI and NDK development are also relatively common. 5G is here, and recruiters are planning small video functions for their companies, but we don’t even understand NDK;
Learning development language:
For example, in Kotlin, it is essential to do low-level C/C++, and there is one of the most overlooked high-level object-oriented ideas of the Java language itself;
Source code:
Understand and be familiar with the source code, familiar with its implementation principles, and strive to be able to package the third party library twice.
Why is NDK more and more important?
One is the rapid development of short video, live broadcast and other industries . Audio and video + social networking has become a new growth point for traffic. In the past two years, short video, live broadcast, online video and other industries have continued to explode. Among them, Douyin has become a leader, with daily activity exceeding 250 million, replacing QQ/WeChat on the 19th Year of the Pig Spring Festival Gala and becoming another national-level APP.
The second is a new round of integration and development of new technologies such as artificial intelligence, 5G, and the Internet of Things . We will continue to find practical locations. In the era when mobile is king, Android with 80% market share is the biggest beneficiary. According to operator news, 5G mobile phones will be launched in China in the second half of 2019 and will be fully commercialized in 2020, when audio and video will usher in another wave of upsurge.
In actual specific applications, in addition to the short video directions mentioned above, there are also major video applications. Image processing, filters, cropping and other operations require professional audio and video development knowledge to make.
So, how to start NDK learning?
We know that the field of NDK is becoming more and more extensive, as machine learning, AI mobile terminal landing requires the use of C and C++ compiled library functions.
To give a simple example, the original loading images generally use Universal-Image-Loader or Picasso, but the performance of the image loading library fresco made by Facebook kills all the image libraries before it can even achieve an order of magnitude performance improvement on some data. How did Facebook do it?
It uses the anonymous shared memory (Ashmem, Anonymous Shared Memory) that the image library has not used before. This part of the memory is not within the scope of Android GC and needs to be managed by itself, but in this way it can break through the heap memory limit allocated by Android. The efficiency is greatly improved. The use of Ashmem is completely realized through C++, not to mention that many core algorithms, multimedia libraries, etc. are all made with NDK.
In fact, it is not only C++, but also requires Framework and architecture refactoring. In the final analysis, I just want to explain one point. If you are just an ordinary Android code farmer, then Java is enough, but if your ideal is bigger than this, C++ is a necessary skill for you to advance.
Of course, our NDK is not easy to learn. When we talk about C++, we think of the wonderful and unforgettable time in university. In 996, an Internet company that has become a common practice, we have no way to spare a lot of time to explore and learn. The cost of trial and error is hard to estimate. At this time, it is understandable to use some successful experience.
Finally, I sent the benefits. Now follow me and join the group chat to get the source code analysis, custom View, animation implementation, architecture sharing, etc.
The content is moderately difficult and concise. It only takes more than ten minutes to read every day.
You can discuss with me, welcome to join the group to discuss, there are flutter-low-level development-performance optimization-mobile architecture-senior UI engineer-NDK related professionals and video teaching materials, and there are more interview questions waiting for you to pick up and
click on GitHub to receive
%96%AA%EF%BC%81.md)**
[External link pictures are being transferred...(img-ZlR18VRp-1611136094408)]