Android system APP development

With the promotion and deepening of smart phones, the role of mobile phones is no longer simply to make calls and send text messages. Various APPs for consumption, chatting, social networking, and travel have sprung up in the APP market like mushrooms after a rain. Whether it is on the street or in the shopping mall, the bow-headed people can be seen everywhere, which also confirms the importance of mobile phones to us.

1. Main technology of APP development

Java is a comprehensive object-oriented language with corresponding advantages such as security, robustness, wide distribution, and portability. It is these advantages that make Java widely used in many industrial fields. Corresponding Android software can be found on commercial e-commerce websites. From scientific applications to economic applications, such as electronic trading systems, from electronic games to desktop applications, we can see the shadow of Java at any time. Android is an operating system built according to the free and open source code of Linux. It is mainly used in mobile devices, such as smart phones or tablet computers. It is jointly developed by Google and the leaders of the Open Handset Alliance. The development of smart phones must be accompanied by the evolution of the operating system. Android is one of the mobile operating systems, but it quickly occupies the vast majority of the market share because of its open source nature.

2. Overview of the Android operating system

2.1 The concept of Android system

Android system performance. Today's Android system itself has Bluetooth, wireless network connection performance, photography, camera and other related functions, and has data transmission and download functions, and the corresponding software can directly perform corresponding installation, virtual keyboard conversion and other corresponding functions. , The addition of related advanced technologies such as remote printing and fingerprint payment systems. Android is the most widely used operating system nowadays. It has a certain openness and complete performance characteristics, which makes the current Android system compatible with more and more smartphones. Not only that, it also drives Android The in-depth progress and development of the system itself.

Android system architecture. The Android operating system can be roughly divided into the following five components: the first is the basic application software, which is an important part of the Android system, such as browsers, calculators, address books, maps, alarm clocks, software stores, etc. It laid the foundation for the use of smart phones. The overall framework of the Android system program can provide prerequisites for the application of the application software program. Therefore, such a framework can normally run all the APP programs in it. The third is all the control and connection links of the operator subsystem of the Android system, including the control of the mobile phone interface. The fourth is the operating system of the Android operating system in the process of operation. This architecture is related to the performance functions of the Android system and the status of system abnormality monitoring, system garbage disposal, and management software architecture. Finally, it is about the multi-threaded operating system. Android's multi-threaded operating system can maintain the normal operation of the entire Android system, and make corresponding distinctions among the internal areas of the system for safe driving.

2.2 Android system architecture

Basic architecture: In the Android system, the architecture of the operating system is roughly divided into the following four layers, namely: Linux kernel layer, system operation library layer, software framework layer and its corresponding application layer.

Linux layer: The basic layer of the Android operating system is established according to the Linux Kernel, and its performance is mainly responsible for the performance of the operating system, including many driver software, such as display drivers, infrared drivers, camera drivers, Bluetooth driver, etc., it is the existence of such driver software to operate our corresponding device tools.

System runtime layer: The system runtime layer mainly includes two components: library files and Android operating conditions. The library files here mainly use some C/C++ library files that will be used in the Android system, including: desktop controllers, media libraries, SQLite and other related files. The Android operating environment refers to what we call virtual device technology, which is equivalent to the JDK and JVM in java, and is the core library necessary to run the Android application system.

Application framework layer: The inventory released by Google is mainly used. We learn Android mainly to learn such a layer, and we can operate our software with the help of various frameworks. In the research and development process, it is required to respect the research and development principles of the framework system. The framework mainly includes ActivityManager, window control device, view system, notification management system, and telephone communication controller.

Application layer: The application layer is actually the software layer developed by us. It mainly uses the Java language to carry out corresponding research functions, such as: music player, photo manager, including maps and address books that we must use in our lives and other related software.

2.3 Four major components of Android system

If you want to learn the development of Android, you first need to be familiar with the four major constructions of the Android system. The main four include Activity, Service, Broadcast Receiver and Content Provider.

Activity: Activity is actually a human-computer interaction system. To put it simply, the content of a screen in a mobile phone belongs to Activity, so the main function of Activity is to store different types of display components. The largest component of this is the most fundamental part of Android. constituent parts. But there is far more than one Activity in an APP.

Service: Service can be understood as an Activity without a screen. For example, there is no corresponding user interface in many programs, and it only exists in the background operation, so it can be defined as a Service. For example, our music background player, Jince system, etc. all operate in such a form.

Broadcast Receiver: The broadcast receiver does not have a fixed user interface. It can feedback the received message by starting an Activity or Service, or notify the user with the help of Notification Manager.

Content Provider: The provision of Content Provider is mainly to deal with the problem of information exchange between application software, to unify the data operation procedures of different application software, and to present the standard to other software so that it can be smoothly In this way, it can reflect its role in data interaction and information resource sharing.

2.4 Build Android development environment

If you want to carry out the corresponding Android research and development work on Windows, you first need to start the corresponding environment construction and structure.

Install the JDK. JDK is actually the core of Java, covering related objects such as Java's own operating conditions and environment, Java tools, and Java class libraries called when developing application software. Therefore, Java-based research and development requires the assembly of corresponding JDK software. You can start the corresponding installation work from the official website according to the differences in the versions you need.

Equipped with variable conditions. In order to equip the system variable environment of JDK, we are required to set three system variables for corresponding research. These three variables are JAVA_HOME, Path and CLASSPATH.

JAVA_HOME: The variable is vertically JDK, and the installation folder or specific location on the calculator is: C:Program FilesJavajdk1.8.0_20. After the creation is complete, JAVA_HOME% is used as a unified reference to the JDK installation directory, and its significance lies in the configuration of subsequent variable values.

PATH: The attribute of PATH has existed for a long time, and the corresponding editing work can be carried out directly. After the original variable, add: %JAVA_HOME% in;%JAVA_HOME%jre in.

CLASSPATH: Set the system variable name: CLASSPATH and its corresponding variable value is: .%JAVA_HOME%libdt.jar;%JA－VA_HOME%lib ools.jar

Install Eclipse. Eclipse is the IDE in the Java application system and its Android development process. It can be downloaded directly on the official website, but the difference from other software is that Eclipse does not need to perform corresponding assembly work. After the direct decompression is completed, it is enough to set the corresponding workspace when it is opened.

Install the Android SDK. In order to be able to deploy and run the corresponding Android software in Windows, it is required that Eclipse configures the Android SDK. Google and Eclipse, which directly provides ADK, can directly use it and configure the corresponding system.

3. Android development environment

The research and development of the Android system is basically realized with the help of the Java language, so it is required to be equipped with the corresponding Java research and development conditions. Before the research and planning, the corresponding Java foundation must be built and the corresponding Java foundation must be assembled. AndroidStudio is a fixed IDE and tool developed by Google Technology Company for Android. Not only that, it can use the previous Eclipse+ADT as the corresponding research and development environment. Android Studio. Its base uses lntellij IDEA as the corresponding R&D equipment, and the R&D speed is relatively fast, and it is the most common R&D tool for APP R&D in the Android system nowadays. The Studio installation package itself carries an AVD, which is in the built Android simulation device, and can carry out corresponding monitoring work.

4. Security environment and precautions for APP development based on Android system

The security challenges brought about by the wireless mobile smart mobile terminal system are more serious than the research on relatively stable networks and desktop devices. The research and development of mobile applications usually requires corresponding high-quality protection, otherwise it will be used by self-employed or enterprise sites. According to the development of Android APP, it is required to consider its corresponding security level for research and development.

As for its code security, corresponding considerations are required from the following levels. First, it is required to use corresponding security requirements to compile corresponding codes to improve the security nature of the software itself; second, it is required to use code obfuscation to maintain its corresponding Code, in order to prevent malicious attackers from performing corresponding decompilation. As far as the relatively open Android system is concerned, code security in the APP development process is a very critical quality control link in the development process, and its protective system should be strengthened. 1. After the program is compiled, the corresponding safety inspection and other related operating procedures are required to be compiled in accordance with the corresponding specifications. As far as rights management is concerned, considering the process of system design with the help of the early operating system security issues, the compilation and assignment of corresponding rights are standardized. Developers can use Androidmanifest.xml and other configuration files and internal rights The control system is used to compile the corresponding permissions. If the application requires access to the mobile or the corresponding LAN, it is required to add the ACCESS NET-WORK STATE for running access to the file. The Android system also requires monitoring after the installation is complete. In order to inform users to avoid corresponding risks. In consideration of the security of the framework layer, it is required to use Android digital certification to complete it. Digital certificates are mainly used to manage application updates and permissions for communication between social applications. Not only that, the security database service is an important form of framework security services. SQLite itself has a certain degree of risk factors in the Android system. Developers need to understand their own system and carry out corresponding protection programming to improve their application software. Encryption plan for data access.

The software library and runtime security and the Android operating system kernel security are also the end-point concerns of developers. The security requirements of the software library and its operating library are to carry out the corresponding hierarchical work according to the corresponding TCP/IP. As far as the Android system kernel complies with relevant standards and requirements, the Linux kernel and virtual machine provide comprehensive security support. Each customer requires a corresponding virtual machine, and there is no mutual influence between them. However, the Android system is open to all internal source codes, and security is under the supervision of customers and their developers. Security vulnerability repair is of vital significance and value to strengthen the overall security. Developers are required to pay attention to the system security repair process.

5.Multi-threaded programming

(1) The concept of multi-threading and multi-threading belong to the same operating system, which is built in the state that each program is compatible with each other and operates together. Multi-threading can run several unrelated operating commands at the same time. This command can have its own transmission and output space, and the corresponding configuration is mainly prepared by the operating system. From this point of view, multi-threading is a corresponding feedback system that can be carried out in accordance with multiple operating commands at the same time. When the user of this system issues commands to the operating system with the help of a smartphone, the high-speed operation of the CPU makes each of the different processes respond. Commands can work together and get their corresponding command benefits.

(2) Realization of multithreading. Multi-threading can be used to bring: run () into the software, which is like carrying out the corresponding code instructions. Its execution forms can be roughly divided into two types: thread Thread and thread Runnable. Once the corresponding command is received, the work of the next command cannot be carried out until the command is completed. The second type requires the form of run() to be configured on the corresponding interface when the actual operation is carried out, and the execution code is put into it. In this system, corresponding practical operations can be carried out.

6. Development of app based on Android system

The Android system is an environment created for app development. Nowadays, after the corresponding research and development of the mobile app, it is required to have a corresponding user group to use it. The more people using a mobile app, the more money its software developers will earn. The smartphone itself has corresponding characteristics such as portable nature, smart nature, and more performance. The Android system carries out corresponding configurations according to our usage habits and functions that are often used in daily life, and the vast majority of mobile phone manufacturers and the Android system There is a close cooperation between them, which allows the mobile app to have a large number of potential customers directly when the Android phone is sold. In addition, with the continuous enhancement of the performance of the Android system, the attractiveness of people to buy Android mobile phones is also increasing, which makes the market for apps developed based on the Android operating system IQ continue to expand, which is conducive to the development of mobile apps. process and development.

Summarize

With the deepening and development of the times, science and technology have brought great changes to our lives. Under the background of the information age, smart phones have been deeply used in various industries. They have relatively many functions and relatively strong characteristics of receiving information in an instant form, and are deeply loved by mobile phone customers. Based on such a foundation, the Android system is used as the carrier to carry out corresponding research and development of mobile apps, and continuously enrich the performance of its system and its technical framework, making the development and application of mobile apps a step further. In the link of app development , The sound of the Android operating system has a vital role and value. Carry out corresponding research on app development based on the Android system, hoping to help the app better correspond to the Android system.

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