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Kivy GUI

The Kivy GUI is used with Electrum on Android devices. To generate an APK file, follow these instructions.

Android binary with Docker

✓ These binaries should be reproducible, meaning you should be able to generate binaries that match the official releases.

This assumes an Ubuntu (x86_64) host, but it should not be too hard to adapt to another similar system. The docker commands should be executed in the project's root folder.

Install Docker

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
$ sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
$ sudo apt-get update
$ sudo apt-get install -y docker-ce

Build image

$ ./contrib/android/build_docker_image.sh

Build binaries

It's recommended to build from a fresh clone (but you can skip this if reproducibility is not necessary).

$ FRESH_CLONE=contrib/android/fresh_clone && \
    sudo rm -rf $FRESH_CLONE && \
    umask 0022 && \
    mkdir -p $FRESH_CLONE && \
    cd $FRESH_CLONE  && \
    git clone https://github.com/spesmilo/electrum.git && \
    cd electrum

And then build from this directory:

$ git checkout $REV
$ mkdir --parents $PWD/.buildozer/.gradle
$ sudo docker run -it --rm \
    --name electrum-android-builder-cont \
    -v $PWD:/home/user/wspace/electrum \
    -v $PWD/.buildozer/.gradle:/home/user/.gradle \
    -v ~/.keystore:/home/user/.keystore \
    --workdir /home/user/wspace/electrum \
    electrum-android-builder-img \
    ./contrib/android/make_apk

This mounts the project dir inside the container, and so the modifications will affect it, e.g. .buildozer folder will be created.

The generated binary is in ./bin.

FAQ

I changed something but I don't see any differences on the phone. What did I do wrong?

You probably need to clear the cache: rm -rf .buildozer/android/platform/build-*/{build,dists}

How do I deploy on connected phone for quick testing?

Assuming adb is installed:

$ adb -d install -r bin/Electrum-*-arm64-v8a-debug.apk
$ adb shell monkey -p org.electrum.electrum 1

How do I get an interactive shell inside docker?

$ sudo docker run -it --rm \
    -v $PWD:/home/user/wspace/electrum \
    -v $PWD/.buildozer/.gradle:/home/user/.gradle \
    --workdir /home/user/wspace/electrum \
    electrum-android-builder-img

How do I get more verbose logs for the build?

See log_level in buildozer.spec

How can I see logs at runtime?

This should work OK for most scenarios:

adb logcat | grep python

Better grep but fragile because of cut:

adb logcat | grep -F "`adb shell ps | grep org.electrum.electrum | cut -c14-19`"

Kivy can be run directly on Linux Desktop. How?

Install Kivy.

Build atlas: (cd contrib/android/; make theming)

Run electrum with the -g switch: electrum -g kivy

debug vs release build

If you just follow the instructions above, you will build the apk in debug mode. The most notable difference is that the apk will be signed using a debug keystore. If you are planning to upload what you build to e.g. the Play Store, you should create your own keystore, back it up safely, and run ./contrib/make_apk release.

See e.g. kivy wiki and android dev docs.

Access datadir on Android from desktop (e.g. to copy wallet file)

Note that this only works for debug builds! Otherwise the security model of Android does not let you access the internal storage of an app without root. (See this)

$ adb shell
$ run-as org.electrum.electrum ls /data/data/org.electrum.electrum/files/data
$ run-as org.electrum.electrum cp /data/data/org.electrum.electrum/files/data/wallets/my_wallet /sdcard/some_path/my_wallet

How to investigate diff between binaries if reproducibility fails?

cd bin/
unzip Electrum-*.apk1 -d apk1
mkdir apk1/assets/private_mp3/
tar -xzvf apk1/assets/private.mp3 --directory apk1/assets/private_mp3/

unzip Electrum-*.apk2 -d apk2
mkdir apk2/assets/private_mp3/
tar -xzvf apk2/assets/private.mp3 --directory apk2/assets/private_mp3/

sudo chown --recursive "$(id -u -n)" apk1/ apk2/
chmod -R +Xr  apk1/ apk2/
$(cd apk1; find -type f -exec sha256sum '{}' \; > ./../sha256sum1)
$(cd apk2; find -type f -exec sha256sum '{}' \; > ./../sha256sum2)
diff sha256sum1 sha256sum2 > d
cat d

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