Develop Reference

android youtube player OpenYouTubeActivity fullscreen is not working on Android 4.3 and later

m using the android youtube player OpenYouTubeActivity, i'm using the svn source code, not the jar file provided in the project. But it seems that this activity is not working after the 4.3 android releases. the video is shown half of the full screen, but everything else works fine. THis issue is already logged on the issues list on the project site.
Anybody has any clue, whats happening? Any solution is greatly appreciated.

Its always best to use the jars, because you get the latest compiled code and its easy for the maintainers to maintain versions. But I think on the code branch the fix here is to decompile the jar using an open source decompiler like http://jd.benow.ca/ and then copy the code as is.
Then you can see where the changes have been made.
DISCLAIMER
Please follow the licensing as the original wants it. I think its as per Apache, so make sure to include appropriate licensing information and credits and follow licensing laws.

Which is the latest source code?

This is my first post to this group. I am looking at the screenrecord.cpp source code from android.googlesource.com. I found the following source links for the screenrecord.cpp file.
https://android.googlesource.com/platform/frameworks/av/+/android-4.4.2_r1/cmds/screenrecord/screenrecord.cpp
https://android.googlesource.com/platform/frameworks/av/+/aaa3f358410701710e31f31de62f0b4521989661/cmds/screenrecord/screenrecord.cpp
I think, #2 link is the latest source code for screenrecord.cpp. However, how can I know which source code is the latest one?
Any idea would greatly help me.

The answer depends on what you mean by "latest".
The currently-shipping version of Android, "KitKat" 4.4.2, comes with version 1.0 of screenrecord. That's what your first link points to.
The "master" branch of the AOSP source tree has the sources for screenrecord v1.1, which adds some new features. That's your second link. The newer version can be built and run on Android 4.4, but it's not checked into the 4.4 branch, so no devices I'm aware of currently ship with it.
Details about v1.1 are available here.

To see the latest in any git tree, you click on the link higher up the tree.
So for both the link you provided, click on higher up link and you will notice ending up here:
https://android.googlesource.com/platform/frameworks/av/+/master
Within the page is also indicated the latest commit number, and that is the latest as of anytime you are reading this article.
And then travelling down the link to reach the screenrecord.cpp again:
https://android.googlesource.com/platform/frameworks/av/+/master/cmds/screenrecord/screenrecord.cpp
now you notice that this link does not have any version anymore, but is tagged with a commit number - not at the link itself, but the first few lines of the page. That page is also the latest in development right now.

Is there any documentation available for Android os source code

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.

How does android source code work?

I have download a set of android source code, which has folders such as "bionic, bootable, build, dalvik, development, frameworks, hadware, packages, prebuilt" and so on. When I browse the whole code, wonder how "import android.preference.PreferenceActivity;" works in Settings.java(D:\android-srce\Google-source\packages\apps\Settings\src\com\android\settings\Settings.java). I guess there is a android.jar file somewhere after compilation. But how does Settings.java import PreferenceActivity correctly?? I'm a beginner in Android, please help me.

Sounds like you have downloaded the source code to the Android OS. If you want to build your own ROMS then you need to study about building the OS for a particular hardware platform. This is not trivial.
If you want to build an Android app that runs on an Android device then you want to download the SDK instead - start at Android SDK and follow your nose, buy a book, read the sample code.

There is not a lot of information how to change parts of Android. However, you can read information that is connected with the aosp tag. The first cite is source.android.com After the installation of android build system you can see video from marakana group. You'll find a lot of valuable information there.

How to use Tesseract-android-Tools

I am having the tesseract-android-tools 1.00, please help me to use the interface TessBaseAPI.
I juss want to pass one .jpg image to an android application which is having some text as a part of image. then through this tesseract engine i want to extract those text into editable format..
please help to create this application in android...

Did you ever search in the internet for a manual? There are a lot of hints. Recently someone wrote a small tutorial.
Even it is for Ubuntu, but I think it gives you a clue how to proceed.
If not, your operating system is needed.
I tried compiling the tesseract-android-tools (tat) with Windows and Cygwin and failed. Some other succeeded. Then after I compiled the tat with the MAC OS and Terminal and succeeded, by using the NDK 5b.
So first have a closer look in the internet and then specify your question, so appropriate help can be posted.
Best wishes,
Volker

I recently used tess-two, which is a fork of tesseract android tools. Step-by-step tutorial on how to setup your development environment, and how to use the library with android, is provided at the readme section here - https://github.com/gorjanz/com-vodi-smetka.android