Programmer Group

brief introduction The class of a singleton object can only allow one instance to exist. Many times, the whole system only needs to have a global object, which is conducive to coordinating the overall behavior of the system. For example, in a server program, the configuration information of the server is stored in a file. These configurat ...

Through system call, user space can access kernel space. How does it access kernel space? The dynamic loadable kernel module mechanism of Linux solves this problem. The module is a program with independent functions. It can be compiled separately, but it can not run independently. In this way, the Android system can complete the communication b ...

When isModuleRun is false, both Application and AndroidManifest participate in the compilation as Libraries, which do not require Activation to be started and custom Applications to be inverted. isModuleRun=false Unordered modification <application android:allowBackup="true" android:supportsRtl="true" android:theme="@style/App ...

0 design mode If you don't know about design patterns, you can first understand what design patterns are through this article https://blog.csdn.net/qq_42874315/article/details/120006447?spm=1001.2014.3001.5502 1 factory mode The creative design mode is mainly used to create objects. It replaces us to complete the operation of new object ...

if (retryAndFollowUpInterceptor.isCanceled()) { signalledCallback = true; responseCallback.onFailure(RealCall.this, new IOException("Canceled")); } else { signalledCallback = true; responseCallback.onResponse(RealCall.this, response); } } catch (IOException e) { if (signalledCallback) { // Do not ...

catalogue 1: Demeter principle 1. Basic introduction 2: Application examples 3: Application example improvement 4: Precautions and details of Dimitri's law 1: Demeter principle (according to Demeter's law, we should avoid the coupling of indirect friends in classes, so as to reduce the coupling between classes) 1. Basic introduc ...