According to the "45th Statistical Report on China's Internet Development Status", an average of 56 APPs are installed on Chinese Internet users' mobile phones.
Many Internet companies now have a variety of apps, such as social networking, shopping, games, photography, etc. The retention and activity of the APP are data that business owners value very much, and the average cost for a business owner to expand a user to download an app is as high as 192 yuan! The company spent nearly 200 yuan, and the user may uninstall it in two minutes. The cost of a long-term stable user is unimaginable.
The competition among Chinese Internet companies is fierce. How can they quickly release new features to seize the market? How to aggregate various functions into one App? There are also 65535, problems such as mutual calls between applications frequently occur... Because of this, the plug-in technology came into being. The Andriod native system does not allow plug-in apps to exist, and plug-in apps cannot be put on Google Play at all. Plug-inization can be said to be a "black technology" against the native system . The plug-in technology has been very perfect in China, and it is also widely used. A variety of plug-in open source frameworks are also emerging in an endless stream. The more famous ones are Ren Yugang's plug-in project dynamic-load-apk, Ctrip's DynamicAPK, Lin Guangliang's Small framework, 360's DroidPlugin, Didi's VisualApk...
However, it is difficult to find complete plug-in technology learning materials on the Internet, because the knowledge involved is very wide, and you need to master reflection, class loading, dynamic proxy, generics, resource loading, hook technology, and the four major component startup processes , AMS, PMS, AAPT, etc., you also need to have an in-depth understanding of the source code , so plug-in is also a tool for interviewers to check applicants’ technical skills. (Nowadays, you are generally not allowed to develop plug-in frameworks, but you often need to maintain the corresponding plug-in frameworks in your work. This requires you to understand the relevant principles.)
According to official data, 85% of people do not understand the class loading process, and 96% do not master the underlying principles of dynamic agents! If you don't understand these, how can you talk about mastering plug-in technology?
To fully understand the plug-in, we need to understand the underlying implementation of the Android system, mainly to solve the following 3 problems:
1. Load the code in the plug-in and call each other with the main project;
2. Loading of resources in the plug-in and mutual access with the main project;
3. Life cycle management of the four major components;
Let's take a look at these real interview questions about plug-in technology from major manufacturers. Will you?
What is the difference between hot repair, plug-in and componentization?
What are the differences between the major plug-in frameworks?
What does the virtual machine do during the loading phase?
Why is the parent of DexClassLoader not passed to BaseDexClassLoader?
In order to help the majority of Android developers deeply understand the plug-in technology, I especially share the " Notes on Core Knowledge Points in Android Development ", which explains the core principles of commonly used Android plug-in solutions, and takes you to learn the difficulties and key points of plug-in technology, and comprehensively sort out the Android knowledge system .
The latest version now includes ten knowledge points:
- Summary of Java knowledge points
- Summary of Android knowledge points
- Android extension knowledge points
- Summary of performance optimization knowledge points
- Android open source library source code analysis
- Summary of Kotlin knowledge points
- Summary of design patterns
- Gradle knowledge points summary
- Computer network foundation
- Summary of common interview algorithm questions
I believe you can benefit from it
And currently it is still using the off-hours to make corrections. If you see something wrong, please tell me in private, and I will make corrections right away~
If you try to write such a note yourself, you will really feel that you have a much clearer grasp of knowledge, and that you have a stronger sense of control over knowledge, and it is very systematic.
If you need it, you can get it here
And I also shared the following Android interview topics and learning PDFs~