Android development wants to enter a big factory. If you don't have a good degree, you can black frame! ! !

Judging from the current employment situation, the market development space of learning Android framework is still very considerable. After all, many domestic mobile phone manufacturers, such as Huawei, oppo, vivo, Xiaomi and so on. AF development is needed, and other APP vendors are recruiting, so there is still a prospect of learning the Android framework.

Android system architecture is divided into five layers, from top to bottom, they are system app, Java API framework, system runtime layer (Native), hardware abstraction layer (HAL) and Linux kernel layer. System application and Java API framework are all developed in Java language. First on an Android system structure diagram:

The framework layer provides the API for developers to develop applications. The application of the system and our usual development and application are inseparable from the framework.

The framework is always inserted in the whole development life cycle of the App, whether it is the establishment stage from 0 to 1 or the polishing stage from 1 to n, it is also inseparable from the framework. In development, we will encounter all kinds of very strange problems, some of which are puzzling.

Most of these problems are because we don't understand the internal operation principle of Android, but we have mastered the framework and these problems can be easily solved. Therefore, becoming an Android framework expert is also a very scarce talent in the current recruitment process, which can be your stepping stone.

In the interview process of a big factory, the framework must be asked:

For example, if you know the source code structure of Handler, you can better understand these concepts:

Once you enter a big factory, the more you know about the framework, the more you can do and the more you can produce, so you can continue to do it.

As an experienced person, I find that many learners and practitioners face a lot of troubles on the Android framework.

1. The problems encountered in the work scene can only be covered up by blind guesses and feelings. Temporary remedial measures seem to have solved the problems, but due to the lack of guidance of methodology, thinking and tool support, the same problems will appear next time;

2. In the process of ability training, there is a lack of practical environment for Internet projects, and we can only imagine the framework of theoretical knowledge, but we can't know its true face and practical process in practical work.

3. In the promotion of the workplace, only care about functional development, do not understand the underlying principles, lack of in-depth thinking and summary, can not complete high-level work such as complex system design, it is difficult to make great achievements in the work, and challenging work is often left to those who are prepared.

In short, once a problem is encountered, few people can analyze it from point to surface and finally find the bottleneck and the optimal solution. Framework is the deep water area of Android development, and it is also the standard to measure the ability of an Android programmer.

In order to help you better grasp the knowledge points of the framework, here I share with you a handwritten 1595-page internal training study note of "Android 1 1.0 Latest Framework Analysis" by ByteDance to take you off the framework!

Because there are too many documents, in order to avoid affecting everyone's reading experience, the following only shows part of the content of "Android 1 1.0 latest framework analysis" with screenshots.

Finally, let's talk about the benefits of reading source code. When you study one or two modules, you may have a deeper understanding.

Benefits of reading source code:

Finally, if you plan to start reading the source code, you can look at the following information, which can be obtained for free on my official WeChat account.