Android development

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Developing for Android

Pre-requisites

For Navit

  • Ensure that your system has the correct dependencies installed to build Navit.
  • Checkout the latest copy of Navit from svn. The instructions on this page assume you have checked-out a copy to ~/src/navit-svn/

cd ~/src
svn co  svn://svn.code.sf.net/p/navit/code/trunk/navit navit-svn

For Android

path-to-sdk/tools
path-to-sdk/platform-tools
path-to-ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin
  • On Ubuntu you can accomplish this using the following command (assuming the SDK and NDK have been unzipped to ~/src):

export ANDROID_NDK=~/src/android-ndk-r8
export ANDROID_SDK=~/src/android-sdk-linux
export PATH=$PATH:$ANDROID_NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin:$ANDROID_SDK/tools:$ANDROID_SDK/platform-tools

Double-check the version numbers in the paths and adapt if required. If you are running a 64-bit version of the NDK, replace linux-x86 with linux-x86_64.

  • Prepare Android SDK:
    • run android in command line - this will show a GUI for preparing Android SDK
    • select Android 2.2 (API 8) and click 'Install N packages...' button - this will download SDK packages that support API 8

Compiling

We have recently switched from CMake to gradle for the Android build. CMake is no longer supported for the Android build, see the section on gradle for details.

Assuming you've followed the previous steps, you're probably setup to start compiling. Using CMake is the recommended way of compiling Navit for Android. Ensure that:

  • You have a java-jdk installed on your system. On Ubuntu:
sudo apt-get install openjdk-6-jdk

When multiple version of java are installed

update-java-alternatives -s java-1.6.0-openjdk-i386
  • On Ubuntu, ensure that ant1.8 is installed:
sudo apt-get install ant1.8
  • Make sure that you have saxonb-xslt installed:
sudo apt-get install libsaxonb-java

With cmake

  • Ensure that you have CMake 2.8 installed.
  • Create a build directory - this will be the directory into which the Android version of Navit will be built. Assume we've made one in ~/src as follows:
cd ~/src
mkdir android-build
  • Optional: Add a SOURCE_PATH environment variable to your system, pointing to the directory in which you checked out a copy of Navit. You can leave out this step, but make sure you change $SOURCE_PATH in the next steps to the actual path of the directory.
export SOURCE_PATH=~/src/navit-svn
  • Step into the build directory:
cd ~/src/android-build
  • Run CMake (ensure that you're in the build directory when you do this!):
cmake -DCMAKE_TOOLCHAIN_FILE=$SOURCE_PATH/Toolchain/arm-eabi.cmake -DCACHE_SIZE="(20*1024*1024)" -DAVOID_FLOAT=1 -DANDROID_PERMISSIONS="CAMERA" -DANDROID_API_VERSION=8 -DXSLT_PROCESSOR=/usr/bin/saxonb-xslt $SOURCE_PATH
  • Build the apk package:
make
make apkg
  • The previous commands have now created a package called Navit-debug.apk in the following directory:
~/src/android-build/navit/android/bin
  • Copy the package to your device (i.e. sd-card) and run it from there (through a file-manager, for example), or
  • If debug bridge (adb) is enabled run:
adb install navit/android/bin/Navit-debug.apk
  • Later, to reinstall already installed Navit app run:
adb install -r navit/android/bin/Navit-debug.apk

With cmake on Windows

  • install CMake 2.8 if you haven't already, add folder with exe to PATH
  • install MinGW or use MinGW included in the git windows folder (e.g. C:\msysgit\mingw\), add folder with exe to PATH
  • install saxon .NET version from http://sourceforge.net/projects/saxon/files/Saxon-HE/9.3/SaxonHE9-3-0-4N-setup.exe/download,
  • rename transform.exe to saxon.exe, add folder with exe to PATH
  • create a build dir (i.e. "mkdir android-build")
  • run from build dir ( replace $SOURCE_PATH):
cmake -DCMAKE_TOOLCHAIN_FILE=$SOURCE_PATH/Toolchain/arm-eabi.cmake -DCACHE_SIZE="(20*1024*1024)" -DAVOID_FLOAT=1 -DANDROID_PERMISSIONS="CAMERA" $SOURCE_PATH -G "MinGW Makefiles"
  • run MinGW32-make
  • run MinGW32-make apkg
  • install Navit-debug.apk (in <build path>/navit/android/bin) to your device
    • copy navit/android/bin/Navit-debug.apk to your device (i.e. sd-card) and run it from there or
    • if debug bridge (adb) is enabled run adb install navit/android/bin/Navit-debug.apk

With gradle

Note: this section is still under construction and may not yet be accurate!

These setup instructions are for a machine that does not have Android Studio installed. If you have Android Studio, some of them may not be necessary (or can be accomplished in a different way).

  • Make sure you have the following Android SDK components installed (if not, install them using Android SDK Manager):
    • Android SDK Platform-tools, version 25.0.3 or later
    • Android SDK Build-tools, version 27.0.3
  • Make sure you have the ANDROID_HOME environment variable set and pointing to your Android SDK dir. On Linux, this can be accomplished by adding the following line at the bottom of your .bashrc file in your home dir:
export ANDROID_HOME="$HOME/bin/android-sdk-linux_86" (use the actual path to your SDK install here)
You need to enter the command in your current shell as well in order for it to take effect there as well.
  • On Ubuntu 18.04 or later (or if your default JRE is Java 9 or later), edit $ANDROID_HOME/tools/bin/sdkmanager. Change line #31 to read:
DEFAULT_JVM_OPTS='"-Dcom.android.sdklib.toolsdir=$APP_HOME" -XX:+IgnoreUnrecognizedVMOptions --add-modules java.se.ee'
  • Now run $ANDROID_HOME/tools/bin/sdkmanager "cmake;3.6.4111459" and accept the license agreement. (If the package is not found, run $ANDROID_HOME/tools/bin/sdkmanager --list | grep cmake and install the cmake version reported there.)
  • Make sure you have NDK version 12 or later (if you don’t, install it with $ANDROID_HOME/tools/bin/sdkmanager "ndk-bundle".)
  • If you did not install NDK through sdkmanager, make sure you have the ANDROID_NDK_HOME environment variable set and pointing to your Android NDK dir. (If not, add it as described above.)
  • Change to the Navit source dir and run ./gradlew build.

So far, two issues have been observed with the build:

  • Building vehicle/gpsd and map/garmin fails on Android. As a workaround, edit CMakeLists.txt , inserting the following two lines in the if(ANDROID) block (around line 710):
set_with_reason(vehicle/gpsd "Android detected" FALSE)
set_with_reason(map/garmin "Android detected" FALSE)
  • Bitmap resources are missing from the APK. A workaround is described here—integration of these steps into gradle is being worked on.

Testing an alternative build

If you want to try an alternative build (e.g. Jan's builds with alternative routing) you can do it by :

  • enable unsigned apk installation ( example guide )
  • installing an alternative apk ( e.g. an APK from CircleCI )
  • you will probably need an alternative map to match the application requirements ( such as this one )