= Getting Started: Building for Android =
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Android target is currently only available in [https://trac.pjsip.org/repos/wiki/Getting-Started/Download-Source#GettingfromSubversiontrunk latest source code from repository]. Follow the instructions for the trunk, the development branch has been merged and is not maintained.

== Requirements ==

 * Besides the [http://developer.android.com/sdk/index.html Android SDK], you will also need the [http://developer.android.com/tools/sdk/ndk/index.html Android NDK].
 * Optional if you want to build and and run the sample application PJSUA:
  * [http://www.swig.org/download.html SWIG] (minimum version 2.0.5)
  * Telnet application to interact with PJSUA command line. If you are not familiar with telnet, please find a tutorial suitable for your development platform.

== Build Preparation ==

 1. [wiki:Getting-Started/Download-Source#GettingfromSubversiontrunk Get the source code from repository], if you haven't already. This tutorial applies to PJSIP version 2.2 and above (or the 2.1 from SVN trunk dated 2013/04/24 or later).
 2. Set your [wiki:Getting-Started/Build-Preparation config_site.h] to the following:
  {{{
#define PJ_CONFIG_ANDROID 1
#include <pj/config_site_sample.h>
  }}}
  This will activate Android specific settings in the {{{config_site_sample.h}}}.

== Building PJSIP ==

Just run:
 {{{
$ cd /path/to/your/pjsip/dir
$ export ANDROID_NDK_ROOT=/path_to_android_ndk_dir 
$ ./configure-android
$ make dep && make clean && make
 }}}

Notes:
 * to build for other targets, e.g: x86 or armv7, instead of just '{{{./configure-android}}}', run 
   {{{
   TARGET_ABI=armeabi-v7a ./configure-android --use-ndk-cflags
   }}}
 * for some targets, there may be error like
   {{{
   error: undefined reference to '__stack_chk_fail_local'
   }}}
   this can be fixed by adding {{{-fno-stack-protector}}} into CFLAGS, e.g: via {{{user.mak}}} file.
 * the {{{./configure-android}}} is a wrapper that calls the standard {{{./configure}}} script with settings suitable for Android target.
 * you may pass standard {{{./configure}}} options to this script too.
 * for more info, run {{{./configure-android --help}}}
 * other customizations are similar to what is explained in [wiki:Getting-Started/Autoconf Building with GNU] page.

== Setting up the target device ==

To run or debug application (such as the sample applications below), first we need to setup the target device: 
 - using virtual device: http://developer.android.com/tools/devices/index.html
 - using real device: http://developer.android.com/tools/device.html

== Building and running pjsua sample application == #pjsua

We have pjsua sample application located under {{{pjsip-apps/src/pjsua/android}}}. It is not built by default, and you need [http://www.swig.org/download.html SWIG] to build it.

Follow these steps to build pjsua:
 1. Make sure SWIG is in the build environment PATH.
     - Alternatively, update SWIG path in {{{$PJDIR/pjsip-apps/src/pjsua/android/jni/Android.mk}}} file.
 1. Run {{{ndk-build}}} from directory {{{$PJDIR/pjsip-apps/src/pjsua/android}}} (note that the Android NDK root should be in the PATH), e.g:
     {{{
$ cd /path/to/your/pjsip/dir
$ cd pjsip-apps/src/pjsua/android
$ ndk-build
     }}}
 1. Create Android project from pjsua. In Eclipse:
    a. From menu: '''File''' --> '''New''' --> '''Project'''
    a. Select '''Android Project from Existing Code''', press '''Next'''
    a. In ''Root Directory'', put the location of '''pjsua''' source code (i.e. {{{$PJDIR/pjsip-apps/src/pjsua/android}}}) and press '''Finish'''
 1. You may need to select different Android SDK than what is configured in pjsua. You can do this from the project's '''Properties'''.
 1. Run it.
 1. You will see telnet instructions on the device's screen. Telnet to this address to operate the application. See [wiki:PJSUA-CLI PJSUA CLI Manual] for command reference.


== Building and running pjsua2 sample application == #pjsua2

Another sample application, which is based on [https://trac.pjsip.org/repos/ticket/1519 pjsua2 high-level API] with SWIG binding, is located under {{{pjsip-apps/src/swig/java/android}}}. It is not built by default, and you need [http://www.swig.org/download.html SWIG] to build it.

Follow these steps to build pjsua2 sample application:
 1. Make sure SWIG is in the build environment PATH.
 1. Run {{{make}}} from directory {{{$PJDIR/pjsip-apps/src/swig}}} (note that the Android NDK root should be in the PATH), e.g:
     {{{
$ cd /path/to/your/pjsip/dir
$ cd pjsip-apps/src/swig
$ make
     }}}
 1. Create Android project from pjsua. In Eclipse:
    a. From menu: '''File''' --> '''New''' --> '''Project'''
    a. Select '''Android Project from Existing Code''', press '''Next'''
    a. In ''Root Directory'', put the location of '''pjsua2''' source code (i.e. {{{$PJDIR/pjsip-apps/src/swig/java/android}}}) and press '''Finish'''
 1. You may need to select different Android SDK than what is configured in pjsua2. You can do this from the project's '''Properties'''.
 1. Run it.


== Debugging native code with Eclipse == #debug-native

Here are the steps for debugging PJSIP native code using Eclipse:
 1. Build PJSIP with debugging enabled, e.g: insert {{{CFLAGS += -g}}} into {{{user.mak}}} in PJSIP root directory.
 1. Make sure that the JNI part of the application is built using {{{ndk-build}}}. For reference, check pjsua's {{{Android.mk}}} build config in {{{pjsip-apps/src/pjsua/android/jni}}}, it contains sample of how to import PJSIP build settings (build search paths, build flags, etc) and SWIG invocation.
 1. Enable NDK plugin for Eclipse, check [http://tools.android.com/recent/usingthendkplugin this] and follow the instructions.
     - CDT can also be fetched from [http://www.eclipse.org/cdt/downloads.php CDT download page], normally Eclipse for C/C++ will have CDT installed, just make sure that the CDT version is 7.0.2 or newer.
 1. It is recommended to introduce delay (about 5 seconds) in the application code between loading the native code library and calling any native functions (to be debugged), e.g:
     {{{
try {
	System.loadLibrary("some_native_lib.so");
} catch (UnsatisfiedLinkError e) {
	return -1;
}

// Wait for GDB init
if ((getApplicationInfo().flags & ApplicationInfo.FLAG_DEBUGGABLE) != 0) {
	try {
		Thread.sleep(5000);
        } catch (InterruptedException e) { }
}

// Start calling native functions here
// ...
     }}}
 1. Load the PJSIP project to Eclipse (if not yet), and try put breakpoint anywhere in the PJSIP code before launching the Android application debug configuration in Eclipse.



== Other Android projects ==

Also have a look at the following PJSIP Android project:
 * [http://code.google.com/p/csipsimple/ csipsimple] project, an Android port of pjsip.