Shulou(Shulou.com)06/02 Report--

This article will explain in detail what the design goal of Android SDK is, and the content of the article is of high quality, so the editor will share it for you as a reference. I hope you will have some understanding of the relevant knowledge after reading this article.

Generally, it is a collection of development tools used by software engineers to build applications for specific software packages, software frameworks, hardware platforms, operating systems, and so on. This kind of Android SDK security helps to reduce the possibility of malicious applications damaging devices.

As mentioned earlier, Android runs on the Linux kernel. Android applications are written in the Java programming language and run in a virtual machine (VM). It is important to note that this VM is not the JVM you think it is, but Dalvik Virtual Machine, which is an open source technology. Each Android application runs in an instance of Dalvik VM that resides in a process managed by the Linux kernel, as shown in the following figure:

An Android application consists of one or more components:

Applications with visual UI are implemented with activities. When the user selects an application from the home screen or the application launcher, an action is started. The service should be used for any application that needs to last for a long time, such as a network monitor or update-checking application. Content providers can think of content providers as database servers.

The task of the content provider is to manage access to persistent data, such as SQLite databases. If the application is very simple, you may not need to create a content provider. If you are building a larger application, or if you are building an application that needs to provide data for multiple activities or applications, you can use a content provider for data access.

The broadcast receiver Android application can be used to process a data element or to respond to an event, such as receiving a text message. The Android application is deployed to the device along with an AndroidManifest.xml file. AndroidManifest.xml contains the necessary configuration information.

So that it can be properly installed on the device. It includes the required class names and the types of events that the application can handle, as well as the permissions required to run the application. For example, if the application needs to access the network-for example, to download a file-then the license must be explicitly listed in the manifest file. Many applications may have this specific license enabled. This declarative security helps reduce the possibility that malicious applications will damage the device.

The next section discusses the development environment required to build Android applications. The tools you need can develop Android applications without Eclipse and Android Developer Tools plug-ins, but you need to be familiar with Android SDK.

Android SDK is released as a ZIP file, which you can extract to a directory on your hard drive. Since there are multiple SDK updates, it is recommended that you consciously organize your development environment so that you can easily switch between different SDK installations. SDK includes: the Java archive, which contains all the Android SDK classes needed to build the application. Documention.html and docs directories SDK documents available locally and online.

The main form of these documents is JavaDocs so that you can navigate a large number of packages in SDK. The document also includes a high-level development guide and links to the Android community. The samples subdirectory contains source code for various applications, including ApiDemo, which demonstrates a lot of API. This sample application can be a good starting point for Android application development.

Contains all the command-line tools for building Android applications. The most commonly used and useful tool is the adb utility (Android Debug Bridge). This directory contains the drivers required to connect the development environment to Android-enabled devices, such as G1 or Android Dev 1, to unlock the development phone. Only developers of the Windows platform need these files.

About what the design goal of Android SDK is to share here, I hope the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.