Android source code structure

Introduction
using the Andriod SDK for application evolution, we need to debug the source code, may need to work to a alley within the Android API functions debugging. However, if the target is not associated with the corresponding version of the SDK version of the source code, it would hint you to find the source code.
Figure: can not find the source Android Tips

We always kas long asAndroid system namely one open source project, the Internet tin download the source code. General search ashore the Internet, download the source code ambition detect a variety of ways, such as the use Git and Repo, android source code download site is http://android.git.kernel.org/. Android above the use Git to download the source code of the means, I ambition no reiterate them, for the Internet in many ways, here is a reference to the interlock beneath the Windows platform, Android source code download.
If you're a apprentice like me, I believe that perusing the above article, you will know how to use Git to download the android source code. However, looking by http://android.git.kernel.org/ site under a variety of directories and files, I believe you will favor me dumbfounded, not knowing that the directory under the file corresponds to what code, to find the things they need are more tough. So here to acquaint you about the android source code, structure, and if base to have bad with the article, but amuse drop tiles, pat shoes!
Figure: http://android.git.kernel.org/ the file under the complicated

Android source code architecture
understand before you come to re-familiarize yourself with the system architecture of Android it,Mens Gucci Sneakers! Android system architecture is divided into four layers, from bottom to altitude are: Linux operating system and driver class, the local framework and the Java runtime environment, Java framework, Java application floor. Detailed specification of each layer in this for a little before.
Figure: Android System Architecture

Android source code structure
know
Android code project is divided into 3 parts, after opening the http://android.git.kernel.org/ look namely the android source code root directory. (Suggestion: open this site in the control learn and emulating)
Core (Core Project): establishing the root because Android system, each file in the root directory folder. Extension (External Project): stretched use of the function of additional open source projects, in the external folder. Package (Package): obtainable Android applications and services in the package folder.
1, Android's gist projects
Android's core projects include the basic operation of the support Android system, and the Android system, build system, the project follows the table:
Android's core engineering project name
Project Description bionic
[Build System] C run-time support: libc, libm, libdl,Gucci Trainers, the dynamic linker bootloader / legacy
Bootloader reference code (the kernel loader, run before the kernel is running) construct
[Build system] Build system dalvik
Dalvik virtual machine delelopment
High-level development and debugging tools framework / base
Android core framework library framework / policies / base
Framework of the allocation strategy hardware / libhardware
Hardware Abstraction Layer library hardware / ril
Radio Interface Layer (Radio Interface Layer) kernel
Linux kernel prebuilt
[Pre-compiled kernel] on Linux and Mac OS compiled bin advocate system / core
Can be refreshed to minimize environmental system / accessories
Low-level debugging and inspection tools


increase to projects listed in the chart, there are other projects, yet the Android system are the first two levels of source code.
2, Android expansion
Android expansion projects included in the outer folder, behind some revisions to accustom the system's open source Android goes. Some projects escape on the host, and some run on the target machine. Since the expansion to comprise more, do not catalogue them, are interested in their children's shoes can study about some of the message collected.

3, Android's Java package
Android Java packages in the system structure is the Android Layer 4 content, including the applying (Application) and the content provider (Content Providers) 2 parts, and a directory inputmethods is the input chapter.
application (Application) in the package / apps directory,Womens Gucci Flats, including: AlarmClock, Browser, Calculator, Calendar,Cheap Gucci Trainers, Camera, Contacts, E-mail, GoogleSearch, HTML Viewer, IM, Launcher, Mms, Music, PackageInstaller, Phone , Settings, SoundRecorder, Stk, Sync, Updater, VoiceDialer.

content providers (Content Providers) in the package / providers directory, including: CalendarProvider, ContactsProvider, DownloadProvider, DrmProvider, GoogleContactsProvider, GoogleSubsribedFeedsProvider, ImProvider, MediaProvider, SettingsProvider, SubscribedFeedsProvider, TelephonyProvider.

demand download
If you merely need 1 of these alternatively several files, you can use the following git commands:
git clone git: / / android.git.kernel.org / project code route
(example: git clone git: / / android.git.kernel.org / platform / archives / providers / DrmProvider.git)
download destination residence, is the present git bid line where the current directory.
download various versions of the Android SDK source code
for everyone to download a another version of the Windows SDK source code,Gucci Shoes 2010, methods, I too looked for other ways online, but are out of Copy & Paste.
or reference to dissimilar blog post: Use git tool to download android.jar Source Code
1, download Git, and installed;
2, a fashionable document frameworks, is used to cache this folder you will absence to download the Android SDK for the source code
3, start the Git bash command line, enter the command git clone git: / / android.git.kernel.org / platform / frameworks / base.git frameworks, will be the android.git.kernel.org site the base folder of all files and folders to download local frameworks folder;
4, the Git command-line context, using the cd command,Cheap Gucci Shoes, and gradually into the frameworks / base folder;
5, use the

6, you need to find the appoint of the source code and version, using the command
7, the frameworks / base / core / java copy all the files under your SDK directory
Note: Each switch simulator edition, git will automatically be downloaded from the website version of the source code corresponding to the frameworks / found / folder, and then the folder under the files are copied to the corresponding version of the SDK catalogue can be.