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Build Blockstream Green

Build requirements

You need to have the following Android developer tools installed:

  • "Android SDK Platform-tools" version 29.0.3 recommended
  • "Android SDK Tools" version 26.1.1
  • "Android SDK Build-tools" version 29.0.3

The above tools can be installed from the Android SDK manager.

Clone the repo

git clone https://github.com/Blockstream/green_android.git

cd green_android

How to build

Use the released native libraries (recommended):

The pre-built native libraries are the same versions used in the builds published by GreenAddress. Gradle/Android Studio will automatically use the latest.

To download and update manually native libraries to the latest supported run:

cd app && ./fetch_gdk_binaries.sh && cd ..

Cross-compile the native libraries (advanced):

If you wish to make changes to the native libraries or would like to build completely from source, you can compile gdk from its source code yourself.

This requires the "Android NDK" (version r19b recommended) from Android developer tools, as well as SWIG. Most Linux distributions have SWIG available, on debian for example you can install it using:

sudo apt-get install swig

You must set the environment variables ANDROID_NDK and JAVA_HOME correctly, then run:

cd app && ./prepare_gdk_clang.sh && cd ..

If you get errors building please ensure your are using the recommended NDK version.

Build the Android app

Run:

./gradlew build

This will build both release and debug builds.

You can speed up builds by limiting the tasks which run. Use:

./gradlew --tasks

To see a list of available tasks.

Rebuild the checkpoints (optional)

Checkpoint files reduce the amount of data that SPV has to download. The checkpoint data is rebuilt periodically but you may wish to update it if you will be making and testing changes.

To rebuild, start both MAINNET and TESTNET instances of bitcoind on localhost. Make sure they are fully synchronized and have finished booting (verifying blocks, etc).

On MAINNET:

./gradlew --project-dir=bitcoinj/tools buildMainnetCheckpoints && mv bitcoinj/tools/checkpoints app/src/main/assets/production/checkpoints

On TESTNET:

./gradlew --project-dir=bitcoinj/tools buildTestnetCheckpoints && mv bitcoinj/tools/checkpoints-testnet app/src/main/assets/btctestnet/checkpoints

Or to build both at once, run:

./buildCheckpoints.sh

Rebuilding with docker (optional)

If you have docker configured and want to build the app in release mode without having to set up an Android development environment, run:

cd contrib
docker build -t greenbits_docker .
docker run -v $PATH_TO_GREENBITS_REPO:/gb greenbits_docker

If you don't need to build the Docker image, you can instead run:

docker pull greenaddress/android && docker run -v $PATH_TO_GREENBITS_REPO:/gb greenaddress/android