Using external libraries

Often it is useful to include external libraries in your module, this can be done on both Android and iOS.

Important: Class names must be unique across all modules and the core Forge app: this means multiple modules cannot include the same libraries. In the future we will be supporting dependencies between modules to allow shared libaries; until then if multiple modules include the same libraries only one of them can be enabled for any individual app.


To include libraries copy them into the module/android/libs folder in your module. Once in place update your inspector project through the Toolkit and the libraries will be included in the inspector project as they would be in a Forge build.

Both Java and native libraries are supported: native libraries should be placed in a sub-folder to indicate the architecture they're built for - see Structure of a module.

If the library you want to include is distributed as unbuilt Java files, you can include that code in your own module source tree and export it as part of the JAR file from Eclipse.


On iOS, there are two two types of external libraries: system frameworks made available by Apple, and 3rd party frameworks.

System frameworks

To include Apple frameworks an add_ios_system_framework build step must be added to link with the framework at build time.

Once added the inspector project should be updated to apply this change while you develop your module.

3rd party libraries/frameworks

There are a number of different formats used to distribute 3rd party libraries for iOS: not all of them are directly compatible with Forge, but with some minor changes they can all be included in a module:

  • If the library is a .a file, simply include it in the ForgeModule project and add it to the ForgeModule target. If the library includes separate header files you can also add these to the ForgeModule project.
  • If the library is a framework you will need to browse the contents of the framework and add the main framework file (which will be the name of the framework with no file extension) and any headers to the ForgeModule manually.
  • If the framework contains any .bundle files you will need to include them in the module (see Including resources).