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Updated documentation and default build config.

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Armin Novak 2016-02-01 16:01:32 +01:00
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221
docs/README.android
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Overview
========
The FreeRDP Android port consists of two parts: the Android Java GUI (client/Android)
and the JNI bindings (client/Android/jni) which are written in C and wrap FreeRDP to
be used with Java. The JNI is directly integrated within FreeRDPs build system.
For building the GUI part there are three possibilities:
* integrated ant build - have cmake to operate ant and build everything
* manual ant build - build JNI with cmake and invoke ant manually for the GUI
* IDE builds using your favourite IDE - use cmake for building JNI and your IDE for GUI
Manual build and IDE build are mostly used for development.
The FreeRDP Android port consists of three parts:
* Android Java GUI (client/Android/Studio)
* FreeRDP library and its dependencies
* JNI bindings (client/Android/android_freerdp.c
and client/Android/Studio/freeRDPCore/src/main/java/com/freerdp/freerdpcore/services/LibFreeRDP.java)
Build requirements
=================
@ -19,196 +14,64 @@ For the Android port some additional dependencies need to be fulfilled:
* for JNI
- Android NDK (>= r9)
- prebuild static openssl libraries (see below)
- prebuild openssl (optionally libjpeg and openh264)
* for the Java GUI (if build with ant)
- ant
- Android SDK Tools - version >= 21
- Android Support Library (note: make sure ANDROID_APP_TARGET_SDK is set to be at
least the API level required by the support library)
* for the Java GUI
- Android SDK
FreeRDP requires openssl libraries for building but they are not part of the
FreeRDP requires openssl libraries for building but they are not part of the
Android NDK and therefore they need to be prebuild manually.
Multiple source versions and builds of static openssl libraries are floating around.
At the time of writing we have tested and used:
https://github.com/bmiklautz/Android-external-openssl-ndk-static
https://github.com/akallabeth/openssl-android
For jpeg support https://github.com/akallabeth/jpeg8d has been tested and used.
However, any other static builds should work as well.
Build openssl and jpeg
Build native libraries:
======================
Set up ANDROID_NDK and ANDROID_SDK to the absolute paths on your machine.
From the project root folder run './scripts/android_setup_build_env.sh'
This will set up openssl and gprof helper libraries as required for FreeRDP.
From the project root run the build script
./scripts/android-build-freerdp.sh --ndk <ANDROID_NDK> --sdk <ANDROID_SDK>
Set ANDROID_NDK and ANDROID_SDK to the absolute paths on your machine.
This will fetch sources from git and build OpenSSL, OpenH264, libJPEG.
The native FreeRDP libraries will also be build.
Currently the default script builds for:
* armeabi
* armeabi-v7a
* x86
* mips
Building
========
64 bit architectures will be added as soon as the OpenSSL build scripts
support the android build for those.
Integrated build
----------------
When the script is finished the libraries are ready for android studio to
be picked up in client/Android/Studio/freeRDPCore/src/main/jniLibs
Run the following commands in the top level freerdp directory. Don't
forget to set ANDROID_NDK, ANDROID_SDK and FREERDP_EXTERNAL_SSL_PATH
to the absolut paths on your machine:
Building the APK (Android Studio)
================
cmake -DCMAKE_TOOLCHAIN_FILE=cmake/AndroidToolchain.cmake \
-DANDROID_NDK="_your_ndk_path_here_" \
-DFREERDP_EXTERNAL_SSL_PATH="_your_ssl_build_root_path_" \
-DFREERDP_EXTERNAL_JPEG_PATH="_your_jpeg_build_root_path_" \
-DANDROID_SDK="_your_sdk_path_here_" \
-DCMAKE_BUILD_TYPE=Debug
make
* Import the folder client/Android/Studio in Android Studio
* You are ready to go
After that you should have a client/Android/bin/aFreeRDP-debug.apk.
Manual ant builds
-----------------
First run cmake to prepare the build and build JNI.
Don't forget to set ANDROID_NDK, ANDROID_SDK and FREERDP_EXTERNAL_SSL_PATH
to the absolut paths on your machine:
cmake -DCMAKE_TOOLCHAIN_FILE=cmake/AndroidToolchain.cmake \
-DANDROID_NDK="_your_ndk_path_here_" \
-DFREERDP_EXTERNAL_SSL_PATH="_your_ssl_build_root_path_" \
-DFREERDP_EXTERNAL_JPEG_PATH="_your_jpeg_build_root_path_" \
-DANDROID_SDK="_your_sdk_path_here_" -DANDROID_BUILD_JAVA=OFF \
-DCMAKE_BUILD_TYPE=Debug
make
Now you can run your favourite ant command in client/Android like this:
cd client/Android/aFreeRDP
ant debug install
Using an IDE
------------
Here is an example on how to use Eclipse for developing/building the Java GUI.
For this the "Android development tools for Eclipse" are required (available via
the eclipse marketplace).
cmake -DCMAKE_TOOLCHAIN_FILE=cmake/AndroidToolchain.cmake \
-DANDROID_NDK="_your_ndk_path_here_" \
-DFREERDP_EXTERNAL_SSL_PATH="_your_ssl_build_root_path_" \
-DCMAKE_BUILD_TYPE=Debug -DANDROID_BUILD_JAVA=OFF
make
Open Eclipse and choose:
File -> Import -> General -> Existing Projects into Workspace
Browse to the client/Android directory in your FreeRDP folder and click finish.
If you get something like "Project 'aFreeRDP' is missing required source
folder: 'gen'" just build the project once and you are good to go.
Side note: If you add -G "Eclipse CDT4 - Unix Makefiles" when running cmake
you can also import FreeRDP into Eclipse too. Then you have one Java project and one c/c++
project you can work on. This requires CDT to be installed in Eclipse.
Debugging native code
---------------------
All CMake builds created with -DCMAKE_BUILD_TYPE=Debug will be ready to
debug with ndk-gdb.
Eclipse projects are already configured to allow debugging in either Java
or native code, no extra steps required.
cmake variables
===============
JNI related
-----------
CMAKE_TOOLCHAIN_FILE
* the toolchain file to use must be cmake/AndroidToolchain.cmake
ANDROID_NDK (used from toolchain file)
* absolute path to the NDK
ANDROID_ABI (used from toolchain file)
* Android ABI to build for (default is armeabi-v7a)
FREERDP_EXTERNAL_SSL_PATH (used by FindOpenSSL)
* absolut root path to the prebuild static openssl libraries
FREERDP_EXTERNAL_JPEG_PATH (used by FindJPEG)
* absolute root path to the prebuild static jpeg libraries
WITH_DEBUG_ANDROID_JNI
- enable debugging for JNI
The libraries must be located in obj/local/armeabi/ or obj/local/armeabi-v7a/.
Cmake searches in armeabi first then armeabi-v7a. It is possible to build FreeRDP
for armeabi-v7a and link against armeabi openssl but not the other way around.
Therefore it is suggested to build openssl for armeabi.
Java GUI related
----------------
ANDROID_BUILD_JAVA (used by client/Android/CMakeLists.txt)
* can be ON/OFF (default OFF) whether or not to build the GUI with cmake
ANDROID_SDK (used by client/Android/CMakeLists.txt)
* absolute path to the Android SDK to use
ANDROID_NDK
* absolute path to the Android NDK to use.
WITH_DEBUG_ANDROID_JNI
* enable logcat debug messages for JNI calls.
WITH_ANDROID_DEBUG_MENU
* activate a debug menu in aFreeRDP to enable / disable runtime settings
* not available in release.
WITH_OPENSLES
* Enables / disables sound and microphone support for android using OpenSLES
ANDROID_BUILD_JAVA_DEBUG
* Enable / disable debugging code in the java parts of the application.
ANDROID_APP_VERSION
* The version the aFreeRDP-release.apk / aFreeRDP-debug.apk will have.
ANDROID_APP_TARGET_SDK
* The target SDK version of the project.
ANDROID_APP_MIN_SDK
* The lowest supported SDK version
ANDROID_NATIVE_API_LEVEL
* The native API level to compile the native code against.
* Should be equal to SDK level.
This is used to generate local.properties needed by ant. Needs to be set
if you build manually with ant or do integrated builds.
Building the APK (gradle)
================
* change to directory client/Android/Studio
* run ./gradlew build to build
* run ./gradlew tasks for other gradle options
Development
===========
Updating JNI headers
--------------------
Updating JNI
------------
Whenever the FreeRDP API changes or you need some extra functionality in your Java
GUI the JNI needs to be updated. The JNI headers are generated from the compiled
Java classes:
GUI the JNI needs to be updated.
* edit client/Android/src/com/freerdp/afreerdp/services/LibFreeRDP.Java to
The JNI functions are defined in client/Android/android_freerdp.c
Add the new functions to the methods struct.
* edit client/Android/src/com/freerdp/afreerdp/services/LibFreeRDP.Java to
reflect your changes
* build the Android Java project as described above
* run ./scripts/regenerate_JNI_headers.sh from your FreeRDP checkout top level
directory
* edit client/Android/android_freerdp.c and adjust the methods struct to reflect
the changes made.
After that you need to implement the functionality in client/Android/jni/android_freerdp.c and add
the call to client/Android/jni/generated/android_freerdp_jni.c.
After that FreeRDP and the Android package need to be rebuilt to include the latest libfreerdp-android in the package.
Android CMake related Variables
-------------------------------
ANDROID_APP_TARGET_SDK ... specifies the desired android target SDK, currently 21
ANDROID_APP_MIN_SDK ... specifies the minimum android SDK version supported, currently 14
ANDROID_APP_GOOGLE_TARGET_SDK ... specifies the minimum google SDK requirement, currently 16

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scripts/android-build.conf
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@ -19,4 +19,4 @@ BUILD_SRC=$SRC_DIR/build
CMAKE_BUILD_TYPE=Debug
BUILD_ARCH="armeabi armeabi-v7a x86"
BUILD_ARCH="armeabi armeabi-v7a x86 mips"