Preface
Recently, a friend started to secretly submit resumes. His contract with his old club is about to expire. He wants to know what his burden is, and if he renews the contract, he has a bottom line. By the way, he quietly takes a look at new job opportunities. Although the market environment is not good, we are in an industry where wage increases depend on job-hopping.
Since I have been working for 5 years and have gained experience, my friends have received a lot of interview invitations, but after half a month of interviews, I did not receive a satisfactory offer, saying "I was hurt by the current company ". The following are some interview questions summarized by my friend (simple removed, leaving some intractable diseases):
- How to send delayed messages inside android
- How to reduce the size of the so package
- How to harden an application
- How to find the reason and place of ANR from trace.log
- What is the NDK library?
- How to register native functions in jni, there are several ways to register?
- How does Binder realize inter-process communication
- How to detect memory leaks
- Now the download speed is very slow, try to analyze the reason from the perspective of network protocol and optimize
Do the above questions feel like a super class for you ? Before 2016, the company's requirement for APP development was to be able to use it, which resulted in many mobile developers being unchallenging and repetitive in work, and many companies were unwilling to take the risk of applying some new technologies. Friends said that they were harmed by the company. .
Be prepared for danger in times of peace, friends who often go out for interviews should understand that a competent Android programmer must have at least one top spot in the fields of UI, functions, performance optimization, etc. This is also our core competitiveness. For example, the NDK development (including JNI) mentioned above is also one of the means for employers to distinguish applicants . Companies may not use them, but they can select talents by mastering NDK.
Of course, in addition to responding to interviews, NDK is also a necessary foundation and breakthrough point for advanced/senior development. Black technologies such as audio and video development, image processing, performance optimization, security, componentization, plug-inization, etc. all involve JNI/NDK.
So, how should NDK learning proceed ? Many Android developers often hear what others say about NDK and JNI. Many people actually only have a little understanding of this content. The main reason is that there is less involved in daily work, and the things at the bottom of Android are somewhat daunting.
In fact, this is completely unnecessary, you just need some ideas.
Before, some fans asked me to get the skill knowledge map and went to the blog to learn on their own, but in turn they had to ask me why the knowledge on the blog is only practice, but not why it is done?
Of course, it is feasible to learn from blogs, but the deeper you learn, the less satisfied you will be with blogs, because you still don’t understand the principles, and if you encounter a problem, you know it, but you don’t know why . This is the status quo of a large part of our developers
At this moment, what you need most is someone to take you to learn!
Here I share a collection of Android learning PDF + architecture video + source code notes , as well as advanced architecture technology advanced brain maps, Android development interview special materials, advanced advanced architecture materials to help everyone learn to improve and save You can learn when you search for information on the Internet, or you can share it with friends around you to learn together
Interview questions are not only questions, but also detailed answer analysis; videos are not just scattered knowledge points, they will be explained, expanded, and inferred from the simplest to the deeper.
Believe that this can help the vast number of compatriots in Android development to make rapid progress, get an early promotion and raise their salary!
If you need it, you can like + comment , send me a private message , or follow the WeChat public account "Android technology dry goods sharing" reply [data] free to receive)