Android : How to build latest WebRTC revision for Android (on Linux) and run on device

WebRTC is a free, open project that enables web browsers with Real-Time Communications (RTC) capabilities via simple Javascript APIs. It also has a android ndk project WebRTCDemo which can be used as application (.apk) on android device. But one thing I should mention that this demo client does not support peer-connection feature. So it can not connect with http://apprtc.appspot.com. If you need 
an android client that can connect http://apprtc.appspot.com then you need to check out 
libjingle project. I am going to post on this issue in near future.

The WebRTCDemo can be built on ubuntu if you go through the following steps (use terminal to execute command):

• Download the latest Android SDK and NDK. edit ~/.bashrc to add the paths accordingly. 

export ANDROID_SDK="<path to your Android SDK directory>"
export ANDROID_NDK="<path to your Android NDK directory>"
export PATH="$PATH:$ANDROID_SDK/tools:$ANDROID_SDK/platform-tools:$ANDROID_NDK"

• Download depottools and edit ~/.bashrc to add path.
• source ~/.bashrc
• install (sudo apt-get install...):
    g++ (>= 4.2)
    python (>= 2.4)
    libasound2-dev
    libpulse-dev
    libjpeg62-dev
    libxv-dev
    libgtk2.0-dev
    libexpat1-dev
  
  
  For 32-bit builds on a 64-bit system:
    lib32asound2-dev
    ia32-libs
• create a folder where you can download source code from trunk and go to the folder from terminal.
• gclient config https://webrtc.googlecode.com/svn/trunk
• vim .gclient 
• add this line ";target_os = ["android", "unix"]" to .gclient file.
• gclient sync
• cd trunk
• source ./build/android/envsetup.sh
• gclient runhooks 
• sudo ./build/install-build-deps-android.sh
• vim ./webrtc/video_engine/test/android/build_demo.py
• [replace return 'source %s && %s' % (_ANDROID_ENV_SCRIPT, cmd) with return '/bin/bash -c "source %s" && %s' % (_ANDROID_ENV_SCRIPT, cmd)]
• ninja -C out/Debug
• You will find your build file (.apk file) in ./webrtc/video_engine/test/android/bin folder.

Here are the steps to run the application on android device:

• run apk on both android devices.
• configure remote ip address in settings tab on both android devices.(Note: as it does not support peer-connection so these devices need to know each other directly without any server interaction. So devices need to be in same network)
• press StartCall button in Main tab on both android devices.