Website-Icon DED9

Learn Android architecture in simple language

The Android operating system is a stack of software components that is divided into approximately five sections and four main layers, the architecture of which is shown in the figure below.

Linux kernel _ Linux kernel

architecture, In the lower layers of Linux – Linux 3.6 with approximately 115 patches, which creates an abstraction level between the device hardware and all the necessary hardware drivers such as camera, keyboard, screen, etc. It also offers the core of everything that Linux does well, such as networks and a wide range of device drivers, that take the hassle out of connecting to peripheral hardware.

Libraries_Libraries

At the top of the Linux kernel is a collection of libraries including the open source search engine WebKit, the popular libc library, the SQLite database, which is a useful repository for storing and sharing application data, audio and video playback libraries, SSL And libraries are responsible for Internet security and so on.

Android Libraries

This category includes Java-based libraries for Android development. Examples of libraries in this group include application framework libraries, user interface creation, graphic design, and database access. The following is a summary of the major Android libraries available to developers:

With the coverage of major Java-based libraries running Android, now is the time to look at the C / ++ C-based libraries in this layer of the Android software stack.

Android Runtime

This is the third part of the architecture and is located in the second layer from the bottom. This section introduces a key component called the Dalvik Virtual Machine, which is a type of Java virtual machine designed and optimized specifically for Android.

Dalvik VM uses basic Linux features such as memory management and multi-threading, which is inherent in Java. Dalvik VM enables any Android application to run in its own process using the Dalvik virtual machine.

Android runtime provides a set of core libraries that enable Android application developers to write applications using the standard Java programming language.

Application Framework

The Application Framework layer provides many higher-level services to applications in the form of Java classes. Application developers are allowed to use these services in their applications.

Android Framework includes the following key services –

Applications architecture

You will find all Android apps in this layer. The program written on this layer is installed. Examples of such applications are: phonebook, browser, games, etc.

Die mobile Version verlassen