Preface
The following questions are often encountered during interviews by ByteDance or other major companies. If you have good questions or good insights, please share them.
Reference analysis : Guo Lin, Hongyang
Content Features : Clearly organized, with graphical representations that are easier to understand.
Content summary : Including Handler, Activity-related, Fragment, service, layout optimization, AsyncTask-related, Android event distribution mechanism, Binder, Android advanced essentials: AMS, WMS, PMS, Glide, Android componentization and plug-in and other interview questions and technologies Stack!
Next, we have a complete interview question for the ByteDance Android Intermediate and Advanced Interview.
1. How does the problem of picture misalignment in ListView arise?
2. Do you know about hybrid development?
3. Know what hybrid development methods are? Tell them their advantages and disadvantages and their respective usage scenarios? (Answer: For example: RN, weex, 4.H5, applet, WPA, etc. It is still very useful to know some front-end js etc. for Android);
5. What are the processing techniques for screen adaptation?
6. Server only Provide data receiving interface, how to ensure the orderly arrival of data under multi-thread or multi-process conditions?
7. Understanding of dynamic layout
8. How to remove duplicate code?
9. Draw the general architecture of Android.
10 The difference between
Recycleview and ListView. 11. The principle and solution of ListView image loading disorder
ListView itemCaching mechanism: In order to make the performance better, the ListViewline item (the View corresponding to a line) will be cached. Get the item of each line ListViewthrough the getViewfunction of the adapter .
During sliding
1) If a line item has been slid out of the screen, if the item is not in the cache, put it into the cache, otherwise update the cache;
2) Before getting the line item that slid into the screen, it will first determine whether there is an item available in the cache, if so ,convertViewPassed toadaptergetView as a parameter .
Problems:
1) The row item picture display is repeated, and the current row item shows the picture of a previous row item.
For example, ListViewsliding to the second line will load a certain picture asynchronously, but the loading is very slow. During the loading process, the picture listViewhas been slid to the 14th line, and the picture is loaded during the sliding process, and the second line is no longer on the screen. According to the cache described above The principle is that the view in the second row may be reused in the 14th row, so what we see is that the 14th row displays the picture that should belong to the second row, causing the display to be duplicated.
2) The line item picture flickers
If the picture on the 14th line is loaded soon, so we see that the picture on the second line is displayed on the 14th line, and the picture of the line item is displayed immediately, which causes the flicker and confusion.
Solution
Through the above analysis, we know that the cause of the confusion is caused by asynchronous loading and object reuse. If you getViewcan give the object an identifier every time , when the asynchronous loading is completed, compare whether the identifier is consistent with the identifier of the current row item. It will be displayed, otherwise it will not be processed.
12. Dynamic permission adaptation scheme, the concept of permission group
13. Why does the Android system design ContentProvider?
14.
Does the pull-down status bar affect the life cycle of the activity? 15. If a network request is made during onStop, how to resume during onResume?
16. What should I pay attention to when using Bitmap?
17.Bitmap's recycler()
18. The main steps of turning on the camera in
Android. 19. ViewPager usage details, how to set it to initialize only the current Fragment each time, and not initialize the others?
20. The click event is intercepted, but I want to pass it to the View below, how to do it?
21. The realization of the main page of
WeChat 22. The principle of the small red dot on
WeChat 23. Introduction to CAS
end
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