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Journal for KPI teachers

Build Status

Prerequisites

  • sbt 0.13.0 or above
  • Android SDK

Build

You can build this project using sbt:

$ sbt android:package

This will compile the project and generate an APK.

Before building you'd probably need to setup your $ANDROID_HOME environment variables.

On UNIX-like OSes you can do that by adding export ANDROID_HOME="path/to/sdk/" in ~/.bashrc

If this fails try to remove ~/.sbt and ~/.ivy2 directories

$ rm -rf ~/.sbt
$ rm -rf ~/.ivy2

For more command, refer to android-sdk-plugin for sbt.

Tips for faster development iteration

In sbt, ~ is a prefix that repeatedly runs the command when the source code is modified.

~ android:run

This sbt command schedules to execute compile-package-deploy-run process after you save the edited source code. Compiling and packaging runs incrementally, so this iteration takes about only few seconds.

If you use default AVD, try genymotion or other faster virtual device. Deploying apk to the device becomes much faster!

Using IntelliJ IDEA

$ sbt gen-idea

Three more steps are needed for IDEA:

  • Install Scala and sbt (optionally) plugins (if not yet)
  • Project Structure -> Project -> in Project SDK section, select proper Android SDK
  • Project Structure -> Modules -> add Android facet to your project module

We do not recommend to use IDEA's own Android build system, because proguard settings are complicated and not fast. Use commands from android-sdk-plugin for sbt. It runs simple and fast.

Troubleshooting

Runtime error: java.lang.NoSuchMethodError, java.lang.ClassDefNotFoundError

The most likely cause of this error is the problem with proguard-cache. You can try:

  • remove target directory (and optionally bin, gen, project/target, project/project) directories
  • OR / AND
  • remove or comment out the ProguardCache settings from build.sbt

Then, rebuild the project, and the problem should be gone

Build error Android SDK build-tools not available

The most likely cause of this error is that your SDK build-tools are old. Update the Android SDK and retry.

Further Reading