Foreword:

Instead of catching fish in troubled waters every day, it's better to learn more and improve your competitiveness.

Android intermediate and advanced knowledge points:

1. Performance optimization

1. APP stability optimization

1. What stability optimizations have you made?
2. How does performance stability do?
3. How to ensure business stability?
4. If there is an abnormality, how to stop the loss quickly?

2. Optimized APP startup speed

1. What is the principle of startup optimization?
2. How is it asynchronous? Have you encountered any problems with asynchrony?
3. What are the easily overlooked aspects of startup optimization?
4. Is there a good solution to the slow startup caused by version iteration?

java aspect

Basic knowledge points The difference between collection classes and applicable scenarios 1 The difference between static internal classes and non-static internal classes in java memory allocation and creation process memory leak problem? How to ensure thread safety? Many times ( must be asked in the interview ) Which types of locking methods (it is better to involve monitor) Optimistic locking and pessimistic locking (applicable scenarios) The concept of applicable scenarios of locks The concept of thread pool constitutes applicable scenarios Why use thread pools (involving thread allocation) The process of resources, and the difference between the process of allocating resources)
Kernel aspect ( must ask in interview ) GC garbage collection mechanism How does n-time GC find objects to be cleared? Java's four references and applicable scenarios What algorithm is used for GC core cleanup? New generation copy cleaning, old generation mark arranging expansion: How to effectively defragment memory in old generation mark arranging? Java memory structure How is the memory of n java distributed? The loading mechanism of java classes The loading mechanism of java objects The generation of constant pool string objects The caching mechanism of Integer

computer network

Network hierarchy and corresponding protocols
TCP TCP three-way handshake (what happens if no response is received for the first and third time?) TCP waved four times. Congestion control has not been tested?
HTTP HTTP message, the difference between HTTP versions, https
IP Why not use mac as ip address ping implementation principle ttl survival field
ARP description process, broadcast unicast

operating system

The difference between thread and process (what is the resource allocation)
Process communication
Memory space allocation
Deadlock The conditions of the deadlock (detailed example) Ways to avoid deadlock

Design Patterns

Generally speaking, you know which modes you know, and you must explain the applicable scenarios
Singleton mode, lazy man, hungry man, thread safety, double lock
Observer mode
Adapter mode
Appearance mode

android aspect (generally asked according to the project)

android process communication
service
handlerThread
Handler operation mechanism 1 time
recyclerView caching mechanism 1 time
view redraw

Project aspect

Interaction between fragment and activity
What is the safety of using webview? And js call each other
How to ensure that there is no conflict when reading and writing files in the process of resumed transfer description
Asynctask memory leak, why is the leak solution and what is the debugging tool?
MFCC process recording session (Quick hands asked a lot of details and asked to write pseudo code)
MVP
The difference between recyclerView and listview caching mechanism will memory leak if too many items

end

Development requires a certain foundation. I started to enter the Android industry in 2008. During this period, I experienced the heyday of Android, and the so-called Android "cold." Of course, there is also an unspeakable sadness in the middle. Looking at my friends and colleagues one by one, I switched to the front end and changed industries. In fact, my heart was hesitant at the time, but I persisted. This epidemic is a good opportunity. The big waves wash away the sand, and the fittest survives. Wait, maybe you will be waiting for the next wave of gold.

This is some of the information I have accumulated over the past 10 years in this industry. If you want to continue in this industry, or if you plan to change jobs now, you can **Private Message [Learning]** I am willing to share the information with everyone for free.
Or directly click the link below to receive
Android learning PDF + architecture video + interview document + source code notes