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This is the second article in the Android biometric authentication series, Last article By comparing the traditional authentication methods of user name and password with biometric authentication methods, and introducing different encryption methods of biometric encryption, this paper shows developers why biometric authentication technology n ...

Objective: to reduce the number of layout layers Effect: reduce the number of nodes in the view tree, speed up the drawing of the view, and improve the UI performance# When to use: The child view does not need to specify any layout properties for the parent viewIf you need to embed a layout (or view) in LinearLayout, and the root node of this ...

Business component instantiation actually has a large number of application scenarios in enterprise applications. In enterprise applications, the overhead on the JVM under the scenario of frequent creation and destruction of object instances can be unimaginable. Instantiation can reduce the burden of JVM memory management and improve applicatio ...

Author: SakuraUnique Disclaimer: This article is only for study and research. It is strictly prohibited to engage in illegal activities. Any consequences shall be borne by the user himself. 0x00 Preface Reflection can be said to be Java It is the most powerful technology in. It can do too many things. Many excellent open source frameworks a ...

3. With local version For information comparison, select whether to display the update pop-up window. We use event\_bus trigger if (localVersion == remoteVersion) return;eventManager.eventBus.fire(new UpdateAppEvent(versionInfo)); 4. When upgrading the version, pay attention to the difference Android And IOS (1) IOS to update app ...

(4)singleInstance: an Activity stack will be created separately; 8. Optimization of program lock Put the variables created every time in the while loop outside the loop and create them only once //Before modification while(flag){ List<RunningTaskInfo> infos = am.getRunningTasks(1000); String packname = infos.get(0).topAct ...

5, ContentProvider related ContentProvider: content provider is responsible for data access. It is often used for APP data sharing, cross process data access, etc... for example, reading photo albums and contacts are implemented by ContentProvider **1. * * we want to access other applications in our own applications, or some data expo ...

gradle packaging script 1. Different closure meanings defaultConfig{} Default configuration, yes ProductFlavor Type. Share it with others ProductFlavor use sourceSets{ } Source file directory settings, yes AndroidSourceSet Type. buildTypes{ } BuildType type signingConfigs{ } Signature configuration, SigningConfig type productFlavors{ } Produc ...

Sometimes we want to store some data in the application. For example, some configuration information. For example, it stores data such as int, float, boolean and string.Writing files can be cumbersome. You need to read and write files and define the data storage structure. For these simple data, we can use shared preferences (hereinafter referr ...

HandlerThread is familiar to everyone. From the name, it is a Thread with Handler message loop mechanism. It has more message loop mechanism than ordinary threads. It can be said that it is a combination of Handler+Thread. From the source code, it is also designed in this way. Generally, if it is necessary to interact between sub threads and ma ...