How to build Keepass2Android

Overview

Keepass2Android is a Mono for Android app. This means that you need Xamarin's Mono for Android to build it. However, it also uses several components written in Java, so there are also Android-Studio projects involved. To make things even worse, parts of the keyboard and kdb-library are written in native code. The current build-scripts assume that the native libraries are already built (they are included in the repo).

To build KP2A from scratch, make sure that you have Xamarin's Mono for Android installed and also install Android Studio. Make sure that both point to the same Android SDK location.

Prerequisites

Install Xamarin.Android
Fetch all submodules (git submodule init && git submodule update)

Build

On Windows

cd build-scripts
build-java.bat
build-xamarin.bat

build-java.bat will call gradlew for several Java modules. build-xamarin.bat will first make sure that you have all files at their place. (There is a "secret" file for Dropbox SDK keys which is not in the repo, this is replaced with a dummy file. There are also different Android Manifest files depending on the configuration which is selected by calling the appropriate script.)

Notes:

For building the java parts, it is suggested to keep a short name (e.g. "c:\projects\keepass2android") for the root project directory. Otherwise the Windows path length limit might be hit when building.
Before building the java parts, make sure you have set the ANDROID_HOME variable or create a local.properties file inside the directories with a gradlew file. It is recommended to use the same SDK location as that of the Xamarin build.

On Linux

Install Mono
Install Xamarin.Android
- Option 1: Use the mono-project CI builds
- Option 2: Build it from source
Setup your environment:
- Add xabuild to your path: export PATH=/path/to/xamarin.android-oss/bin/Release/bin/:$PATH
- Setup your ANDROID_HOME if it's not already: export ANDROID_HOME=/path/to/android/
- Alternatively, you can set your ANDROID_SDK_PATH and ANDROID_NDK_PATH.
Build jar2xml and copy jar2xml.jar to /path/to/xamarin.android-oss/bin/Release/lib/xamarin.android/xbuild/Xamarin/Android/
Install libzip for your distribution.
- Note: Xamarin seems to require libzip4, yet most distributions only ships libzip5. As a dirty workaround, it's possible to symlink libzip.so.5 to libzip.so.4. Luckily, it appears to be working.
- sudo ln -s /usr/lib/libzip.so.5 /usr/lib/libzip.so.4
- or sudo ln -s /usr/lib64/libzip.so.5 /usr/lib/libzip.so.4
Install NuGet dependencies:
- cd src/ && nuget restore KeePass.sln
Build:
- Option 1: cd build-scripts && ./build-all.sh
- Option 2:
  - Build the Java parts: cd build-scripts/ && ./build-java.sh
  - Build the Xamarin parts: ./build-xamarin.sh
  - Build the signed APK: ./build-apk.sh
Enjoy:
- adb install ../keepass2android/bin/Debug/keepass2android.keepass2android_debug-Signed.apk

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