Programmer Help

Problem backgroundMultithreaded tasks to be executed: Task 1 and task 2 are executed in parallel; When all execution is completed, execute task 3.// Each task takes time to simulate through sleep val task1: () -> String = { sleep(2000) "Hello".also { println("task1 finished: $it") } } val task2: () -> String = { sleep(2000) ...

Scope function selection At present, there are let, run, with and apply   and   also five scope functions. The official document has a table to illustrate the differences between them: To sum up, there are several differences: 1. apply and also return context objects. 2,let,run   And with return lambda results. 3. The ref ...

  Problem background Multithreaded tasks to be executed: Task 1 and task 2 are executed in parallel; When all execution is completed, execute task 3. // Each task takes time to simulate through sleep val task1: () -> String = { sleep(2000) "Hello".also { println("task1 finished: $it") } } val task2: () -> String = { sleep(2 ...

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1, Introduction 1. What is Room The room framework is one of many component libraries of Android Jetpack. The emergence of Jetpack unifies the Android development ecology, various tripartite libraries are gradually replaced by official components, and room gradually replaces competitive products as the most mainstream database ORM framewo ...

Recommended by Haowen: Author: IAn2018 With the blessing of Kotlin, the composition recently implemented by Android makes it easier and faster to write UI. There is no need to worry about layout nesting or declarative UI. So there are so many advantages of composition. Is there a "way out" for native writing? Today, I'd like to sh ...

1, LiveData overview LiveData is an observable data holder class. LiveData is located under the android.lifecycle package and has the ability to sense the life cycle, such as the life cycle of Activity, Fragment, Service, etc. This perception means that there is no need to manually handle the life cycle when using, so as to avoid problems such ...

1, Introduction ORM(Object Relational Mapping) relational mapping library provides a layer of encapsulation on Sqlite to optimize the convenience of database operation. The architecture diagram of Room is as follows: Entity: an entity corresponds to a table in the database. Entity class is the mapping of Sqlite table structure to Java ...

Use of hexadecimal In the development process, it is common to write files. If the content is text, you can open it with a notepad software to check whether the content is correct. If you write an audio file, you should use the audio software to check. If it is a video file, you should use the video software to check... The corresponding files ...

Article structure: Branch statement (if, when)Circular statements (for, while)Jump statements (break, continue, return, label, throw) Branch statement (if, when) if expression In kotlin, if is an expression that returns a value The if branch can be a code block, and the last expression is the value of the block (the return value of the la ...