It is already December 2020, and in two or three days, we will enter 2021. It's time to make a year-end summary.
This is a collection of the latest Android data in 2020. This data is my selection and integration of the higher-quality Android data on the Internet (thanks to all the big guys, I will not agree on it here).
Introduction
Advantages: complete system, comprehensive coverage of knowledge points, organized and high quality.
Reference source: Yugang said, Guo Lin and Hongyang's blog, Tencent Classroom, CSDN, GeekTime and other blog sites, Niuke.com, Recall, Likou and other recruitment sites, as well as in Ali, Tencent, Byte, etc. Friends who joined the big factory (thanks to all the big guys and friends for sharing).
Suitable for the crowd: 3-5 years of work experience, intermediate and senior engineers who plan to change jobs in the next year and are preparing for interviews.
effect:
- Help everyone save the time to search for information online, but also to select;
- Let everyone search knowledge points more convenient and fast;
- Solve your doubts in time and answer your questions;
- Grasp the knowledge points of the Dachang Frequently Asked and Frequent Exams, conduct efficient review in the shortest time, and focus on review in sufficient time.
Information details
Android basics
1. What is Activity?
2. Please describe the life cycle
of Activity 3. Common activity types include FragmentActivitiy, ListActivity, TabAcitivty, etc. Please describe the activity life cycle
4. How to save the state of the Activity or (how to save the data when Activiy restarts?)
5. Which methods must be executed when jumping between two activities?
6. Is the service executed in the main thread, and can time-consuming operations be performed in the service?
7. How is the activity bound to the service and how to start the corresponding service in the activity?
8. Please describe the life cycle of Service
9. What is IntentService? What are the advantages?
10. Talk about the relationship between Activity, Intent, and Service
11. Please describe
the life cycle of BroadcastReceive 12 and BroadCastReceiver
13. Talk about the relationship between ContentProvider, ContentResolver, and ContentObserver
14. Use contentProvider to get all local audio files (Shanghai) (Update
15. When the ListView data set is changed, how to update the ListView
16. How does the ListView implement page loading?
17. Can the ListView display multiple types of items?
18. When Intent transmits data, what types of data can be transmitted?
19. The difference between Serializable and Parcelable
20. Please describe how Intent and IntentFilter
21, Fragment and Activity are transferred between values
22, describe the life cycle
of Fragment 23, the difference between the replace and add methods of
Fragment 24, how Fragment is implemented Similar to the push and pop effect of the Activity stack?
25. The use of Fragment in your project
26. How to switch Fragment without re-instancing
Regarding the topic of Android basics, I only listed 26 representative ones. The topic is here, and the corresponding answers are also there, but the answers have more than 20 pages (already organized into PDF). There is no article here. All the methods are shown (take a few pictures to see below), what is needed is integrated with the latter, friends who need this "Android Intermediate and Advanced Interview Knowledge PDF" can privately message me [1] , I will give you the download address.
Android Advanced (Performance Optimization + Screen Adaptation + Animation in Android + Thread...)
1. How to analyze the performance of Android applications
2. Under what circumstances will cause memory leaks
3. How to avoid OOM exceptions
4. How to catch uncaught exceptions in Android
5. What is ANR? How to avoid and solve ANR
6. What are the ways of communication between Android threads?
7. The difference between Devik process, linux process and thread
8. What are the screen adaptation methods?
9. What are the processing skills of screen adaptation?
10. dp Relationship with px
11. What is AIDL and how to use
12. What is the full name of AIDL? How does it work? What types of data can be processed?
13. Handler mechanism
14. Event distribution mechanism
15. What are the types of animations in Android? What are their characteristics and differences?
16. Attribute animations, such as a button moving from A to point B. Point B can still respond to click events. What is this principle?
17. How to modify the Activity entry and exit animation
Android advanced development, the questions listed above are about this, the answers are more than 40 pages in PDF, and the length is not good. All the answers are attached, and some of the answers are intercepted to show them. For more complete answers, you can privately trust me [1 】 , I will give you the download address!
Android high-frequency interview questions collection
1. Android event distribution mechanism, please describe the entire process in
detail 2. Android view drawing mechanism and loading process, please elaborate on the entire process 3.
The loading process of the four major components of
android , please describe in detail 4. Activity startup mode
5 .A, B, C, and D are the startup modes of the four activities respectively, then A->B->C->D->A->B->C-
6. Activity cache method
7. Service life cycle, What is the difference between the two startup methods
8. How to ensure that the service is not killed
9. What is the difference between static Broadcast and dynamic
10. What data types can Intent pass
11. What are the advantages and disadvantages of Json, and the principle of analysis
12. A Language compilation process
13. What are the types of animation, what are their characteristics
14. Handler, Looper message queue model, the role of each part
15. How to exit and terminate the App
Android high-frequency interview questions collection
Thoughts on data sorting
The above materials are all high-quality resources, and many of the interview questions are directly collected and sorted out by large companies, and then the answers are found one by one.
The hardships of the sorting process will not be clear one by one. It can only be said that sorting is not easy, just use this information well.
In the process of organizing the information, I found that many knowledge points are frequently asked (such as Handler and Binder), and the interviews of Dachang are not as difficult as imagined. Most of them are basic questions asked, and these The basics are what you must master to learn Android.
Regardless of whether it is basic, intermediate or advanced, each part is very important, and I think it is especially basic. If the foundation is not solid, how to build a building?
And all the basic interview questions, the corresponding questions for intermediate and high-level development, and the knowledge points that senior programmers need to master, all related complete analysis are all sorted out. The basic part has more than 40 pages of questions + answers, and there are more than 40 pages of intermediate development. The content of the advanced part is more (there are 180 pages), all of which are made into PDF files, friends in need can send me a private message [1] I will send you the download address.
If you feel the trouble of private messaging, you can directly get the channel: "Scan the QR code below to get it for free."
At last
My friends told me these days that the epidemic seems to be spreading in some areas. I don’t know how many people are still working in other places without family members. They should take good care of themselves. Don’t panic about finding a job. This is similar to looking for a target. It’s a point that people don’t see you well, and it’s also very important that you don’t see others well. However, the premise is that you have enough strength.
Interview is a process of continuous learning and continuous self-improvement. If you have the opportunity, you should go out to meet at least. It can at least check the leaks and fill in the vacancies. And there are some knowledge points that you may think you know, but let you say, you may not be able to say it. well. Some things are motivated by pressure, and the knowledge points learned are all money (because most of the technicians are graded and paid according to your abilities), and the skills are not overwhelming.