Is there any documentation available for Android os source code - android

I want to understand the complete structure of Android OS source code. I have a copy of source code for Gingerbread and want to go through it fully.
Is there any documentation or help available to understand Android OS source tree structure?

Here is some explanation on the folders in Android Source Code to help you get started.
How to understand the directory structure of android root tree?

Source code is documented a little inside source code in comments. There is no official documentation available.

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How to Import Sample ApiDemos into Android Studio 1.5.1

At the end of http://developer.android.com/guide/components/fragments.html is stated "For more samples using fragments (and complete source files for this example), see the API Demos sample app available in ApiDemos (available for download from the Samples SDK component)."
However, ApiDemos is not listed anywhere among the hundreds of items when I try to Import sample... in AS 1.5.1. ADVANCED ApiDemos is listed, but the description says this is NOT what I seek.
It sure would be nice to accomplish this task in one step as advertised instead of having to download each individual file (and worry if the app will work because of some omission) from https://github.com/googlesamples/android-ads/tree/master/APIDemo.
Is there a way to Import sample... ApiDemos somehow?
You can download an archive of ApiDemos directly from here.
https://android.googlesource.com/platform/development/+/master/samples/ApiDemos
Not sure if there is a direct git link, because as you can see, it is under the sample directory of the platform/development repository.
You are more than welcome to clone the whole 300+ MB of the android-development repository and get access to ApiDemos (and much more) like so
$ git clone https://android.googlesource.com/platform/development android-development
$ cd android-development/samples/ApiDemos
There is no samples folder under android sdk for Android Studio 2.1.2. I ended up getting API folders from the link provided by #cricket_007. Also, don't waste time looking for the Fragment sample code in https://github.com/googlesamples because its not there. It only has the latest sample codes.
A reasonable place to find help with Fragment is on one's own computer:
...\AppData\Local\Android\sdk\samples\android-17\ApiDemos\src\com\example\android\apis\app
A search for ArticleReaderFragment (a Fragment in the tutorial) in the parent folder C:\Users\Dov\AppData\Local\Android\sdk\samples\android-17\ApiDemos turned up nothing, so the sample code in question isn't there, but lots of Fragment*.java files could be profitable in one's self-education on the topic.
While not stored with any app, lots of xml files can be found here:
...\AppData\Local\Android\sdk\samples\android-17\ApiDemos\res
FragmentLayout.java is reasonably close to the app in the tutorial.

Android Source Code (any version) compatible for Xilinx ZC 706

I need android source code compatible for Xilinx ZC706 board. Please give me a link of a repository from where I can download. Any version is okay.
Also any suggestion will be highly appreciated.
Sazal
IVeia has a git repo for android on zynq but it is quiet old : LINK
There are some blogs/wiki that might help you to get started. Most of them are for the zc702 board or zedboard but you might find some usefull information there.
http://svenand.blogdrive.com/archive/200.html
http://elinux.org/Zedboard_Android
http://www.wiki.xilinx.com/Android+On+Zynq+Getting+Started+Guide
http://www.wiki.xilinx.com/Android+4.2.2+On+Zynq+Getting+Started+Guide
https://github.com/cambridgehackers/zynq-android4/wiki

What SWT classes are used in the Android ADT AndroidManifest.xml screen?

I'd like to write an Eclipse plugin that looks like the "AndroidManifest.xml" editor page in Google's Eclipse ADT plugin - specifically, this screen. I'm new to SWT development, though, so I don't have a very good understanding of what SWT components one would use to build a screen like this.
So, specifically, I'm asking:
Is there a particular layout I should use to build a screen like this?
What class gives the collapsible headers, like "Application Attributes", with the color-gradient backgrounds?
Are there any source-code examples available for a screen like this?
Better yet, is the source code of the ADT plugin available anywhere? I haven't found it online.
Thanks for your help!
I've accepted Marc's answer, but I wanted to give a more detailed answer here, for the benefit of anyone who comes along later:
The form in question is an example of a "Managed Form". I should have read this: http://www.eclipse.org/articles/Article-Forms/article.html
For the layout, org.eclipse.swt.layout.GridData and org.eclipse.ui.forms.widgets.ColumnLayout seem to be common choices.
The collapsible headers are a feature of the org.eclipse.ui.forms.widgets.Section class.
Javadoc for the Eclipse Plugin Development Kit, including the classes named here, can be found at http://help.eclipse.org/help33/index.jsp?topic=/org.eclipse.platform.doc.isv/reference/api/overview-summary.html
Answer to this part of your question:
Better yet, is the source code of the
ADT plugin available anywhere? I
haven't found it online.
The ADT source is public. See http://tools.android.com/ for more info. Specifically, this page describes how to get and build the source. You should be able to find what you are looking for somewhere in the source tree.

How to get android's native methods source code

Is it possible to get and watch at Android's program component's native methods code. If anyone knows how to, please let me know.
You can find source code for Android native methods using Google Code Search one of the following services:
AndroidXRef
GitHub (using repo:android/* search term)
The search for "SystemClock || android*SystemClock" in AndroidXref will point you to the android_os_SystemClock.cpp file which in turn forwards many of its methods to SystemClock.cpp
Other Android .cpp or .h files with native methods implementations could be found in a similar way.
If you are looking for android SDK code then you can find it here:
https://android.googlesource.com
https://android.googlesource.com
git clone https://android.googlesource.com/platform/frameworks/base
For Google application look at platform/packages/apps/[APP name]
Beside the Android Open Source Project you can find the code just by using google, e.g. search for:
android SystemClock source code
I got links to grepcode (SystemClock). I find it more compfortable to browse the code here (be careful which version of code you are browsing).

How do I see the core Android classes?

I am trying to look inside a couple of Android core classes to see about overriding some methods. I have looked into getting the Android source code, but the process described on the Android dev site is all about installing and setting up some kind of development environment. This is not necessary to me. I just want to open a class or two in a text editor and look at its contents. Does anyone know if this is possible without going through the multitude of steps described on the Android dev forums?
The easiest way is to use Google Code Search. You just have to try a search like Activity.java android and you can see the source code of that class. It even has an outline inspector:
You can download the entire source with git our just look it up as a reference on the git site. Here is a link to the sdk code:
https://android.googlesource.com/platform/frameworks/base
Another option is to use http://grepcode.com/ and perform a search such as "android ViewGroup". I've really enjoyed the style of using grepcode.

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