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README.Android.md

Building and Running FLTK with Android Studio 3

WARNING: FLTK FOR ANDROID IS WORK IN PROGRESS IN A PRETTY EARLY STAGE.

Contents

  1. Building FLTK with Android Studio 3
  2. Extensions and limitation of FLTK on Android
  3. Document History

Building FLTK with Android Studio 3

There is no need to ever write a single line of Java.

Download and install AndroidStudio on your developer machine. If you use AndroidStudio for the first time, use the IDE to download and build the "Native Plasm" sample app. In the process, all resources required to build FLTK will be installed. Once Native Plasm runs on your emulator or physical device, you are ready to install FLTK.

Build FLTK for your native platform first using CMake. AndroidStudio will need a native version of the user interface design tool Fluid.

The following example is for the Xcode IDE on macOS. The same should work for other IDEs and Makefiles on other platforms that run AndroidStudio.

git clone https://github.com/fltk/fltk.git fltk-1.4.git
cd fltk-1.4.git
mkdir build
cd build
mkdir Xcode
cd Xcode
cmake -G "Unix Makefiles" \
  -D OPTION_USE_SYSTEM_LIBJPEG=Off \
  -D OPTION_USE_SYSTEM_ZLIB=Off \
  -D OPTION_USE_SYSTEM_LIBPNG=Off \
  -D OPTION_CREATE_ANDROID_STUDIO_IDE=On \
  ../..

Note the last option, -D OPTION_CREATE_ANDROID_STUDIO_IDE=On. This option will create the file needed to create an FLTK demo project in fltk-1.4.git/build/Xcode/AndroidStudio.

  • open the build/Xcode/AndroidStudio/ directory as a project in AndroidStudio3

  • click "run"; the project should compile and run out of the box

Extensions and limitation of FLTK on Android

Android support for FLTK is in an early stage. As of January 2019, most rendering works, fonts work, bitmaps and pixmaps work, clipping works, window layering works, and mouse clicks and keyboard events are handled

When loading fonts:

  • font names starting with a $ will have the system font path inserted
  • font names starting with an @ will be loaded via the Asset Manager
  • all other names will be used verbatim

Limitations:

  • the screen size is currently fixed to 600x800 and is scaled up
  • many many big and little functions are not yet implemented

Document History

Jan 15 2019 - matt: rewrote document to explain the new CMake process Mar 29 2018 - matt: many graphics functions have been implemented, keyboard Mar 17 2018 - matt: added Android extensions for fonts Mar 12 2018 - matt: started list of limitation that serevs as information to the user as much as a todo list for core developers Mar 6 2018 - matt: moved project to ide/AndroidStudio3/ Mar 2 2018 - matt: rewriting Android port and documentation from scratch Feb 9 2016 - matt: recreated document with more warnings and active support