Programming VIP

principle Define grammar rules for the new "language" and define an interpreter to interpret grammar Implementation core Split the operations of different operators into separate operator expression classes to avoid large and complete parsing classes Best Practices 1 Demand background Suppose we define a new "language" ...

public WindowManager.LayoutParams wmParams; public WindowManager getWm() { return wm; } public void setWm(WindowManager wm) { this.wm = wm; } public WindowManager.LayoutParams getWmParams() { return wmParams; } public void setWmParams(WindowManager.LayoutParams wmParams) { this.wmParams = wmParams; this. ...

Preface Tip: Below is the next article to take notes on 23 design modes. For the previous one, go to the home page to view the previous article 17. An overview of behavioral patterns (classification of behavioral patterns) Behavioral patterns are used to describe complex process control when a program is running, that is, how multipl ...

bool JavaVMExt::IsBadJniVersion(int version) { // We don't support JNI_VERSION_1_1. These are the only other valid versions. return version != JNI_VERSION_1_2 && version != JNI_VERSION_1_4 && version != JNI_VERSION_1_6; } JNI_Onload function is a treasure place for dynamic registration. We can register in RegisterNatives. T ...

Singleton mode Singleton Pattern is one of the simplest design patterns in Java. It belongs to creation mode. It is defined as ensuring that a class has only one instance and providing a global access point to access the instance. The singleton pattern is generally reflected in the class declaration. The singleton class is responsible for cre ...

1. Definition of template method pattern An official point: define an algorithm framework in operation, and delay some steps to subclasses, so that subclasses can redefine some specific steps of an algorithm without changing the structure of an algorithm. More popular: it abstracts some common operations (Methods) and encapsulates them in a t ...

Implement singleton mode The purpose of singleton pattern is to make an object of a class the only instance in the system. The class created by the method of singleton mode has only one instance in the current process (if necessary, it may belong to singleton in a thread, for example, only the same instance is used in the thread context) ...

preface Today I reviewed the command mode, which is very interesting. Here I share it with you! 1. Command mode understanding Command mode is to separate the command issuer from the command executor so that they are not directly connected, but record these commands through a third party, and then the third party tells the command exe ...

How to avoid consuming too much traffic? When the program loads a picture from the network for the first time, it caches it on the mobile device, so that when the picture is used again, it does not need to download it from the network again, saving traffic for users. At present, a commonly used cache algorithm is lru (least recently used). It ...

Singleton definition It belongs to the creation mode; Only one object is created globally. Glide usage form Glide.with(context). . . Glide single case writing context check /** * @see #with(android.app.Activity) * @see #with(android.app.Fragment) * @see #with(androidx.fragment.app.Fragment) * @see #with(androidx.fragment.app ...