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The so-called ORM framework, object relational mapping, is used to make a mapping between relational databases and objects. In this way, when we operate the database, we don't need to deal with complex SQL statements, but just operate it as usual. 4, Project case demonstration ================================================================= ...

Task declaration format To declare a task, you only need to add a task before the task name. For example, the following declares a hello task. task hello Usually, we attach some execution actions to the task, which are called actions, such as hello.doFirst{ println "hello first" } hello.doLast{ println "hello last" } You can a ...

Demo display and hardware construction - light This is a demo of operating the LED to make it flash. We will introduce the basic methods of operating the hardware through this demo. Let's see the final effect first: [external chain picture transfer failed. The source station may have anti-theft chain mechanism. It is recommended to save the p ...

jni technology is used to realize the connection between java and c/c + + code, and is widely used in android platform, such as Start the java virtual machine with local code and create the java running environment. For example, create the java virtual machine after the process zygote startsSystem services are mostly implemented in c/c + +, in ...

Problem description The startup time is too slow compared with the reference machine, about 15s slow. Android system 7.0. problem analysis Bootloader -- > kernel -- > zygote -- > PMS -- > AMS -- > launcher involves many levels It can be analyzed with bootchart or directly through log analysis. Unfortunately, the bootchart can ...

if (result == null) throw new IOException("Canceled"); return result; } catch (IOException e) { eventListener.callFailed(this, e); throw e; } finally { client.dispatcher().finished(this); } } We'll use it here `client` Object (actually created above) `RealCall` Passed in when `OkHttpClien ...

Sweet date Programmer Xiao Ming is very happy today, because today is the first anniversary of his love with his girlfriend. As we all know, it is difficult for programmers to find girlfriends. Xiao Ming is currently the only programmer in their office, and has become the envy of many programmers. Xiao Ming's work efficiency is also very high ...

What is Lifecycle? Lifecycle components refer to Android arch. Various classes and interfaces provided under the lifecycle package allow developers to build classes that can sense the lifecycle aware of other components (mainly activities and fragments). Why introduce Lifecycle? As I said earlier, Lifecycle enables developers to build classe ...

Data binding provides two-way binding function, so many frameworks directly inject ViewModel into xml. I personally dislike this practice. It may be that getting up early and Databinding is immature often leads to inexplicable compilation errors XXX Br not found and can't find variable. When using Databinding, I use it more to get the control a ...

prefaceOkHttp can be said to be the most common network request framework in Android development. OkHttp is easy to use, extensible and powerful. OkHttp source code and principle are also frequent visitors in the interview However, OKHttp has a lot of source code content. If you want to learn its source code, you are often confused and can't g ...