Delta Chat Android Client

This is the android client for Delta Chat. For the core library and other common information, please refer to Delta Chat Core Library.

Get it on F-Droid


When checking out deltachat-android-ii, make sure also to check out the
subproject deltachat-core:

  • When using Git, you can do this initially by
    $ git clone --recursive
    or later by git submodule update --init --recursive. If you do this in your
    home directory, this results in the folder ~/deltachat-android-ii which is just fine.

  • Alternatively, you can download the deltachat-android zip-file; in this case, also download the deltachat-core zip-file and place its contents to jni/messenger-backend

Then, call ndk-build in the root directory to build the C-part;
this also builds deltachat-core. Afterwards run the project in Android Studio.
The project requires API 25.

With chance, that's it :) - if not, read on how to setup a proper development

Install Development Environment

  1. Some libs required by Android Studio may be missing on 64 bit Linux machines
    [Source], so for Ubuntu execute
    $ sudo apt-get install libc6:i386 libncurses5:i386 libstdc++6:i386 lib32z1 libbz2-1.0:i386
    and for Fedora execute
    $ sudo yum install zlib.i686 ncurses-libs.i686 bzip2-libs.i686

  2. Download Android Studio from (
    and unpack the archive which contains a single folder called android-studio;
    move this folder eg. to ~/android-studio

  3. To launch Android Studio for the first time, open a terminal, navigate to
    ~/android-studio/bin, execute ./ and use all standard values
    from the wizard.

  4. Android Studio now ask you if you want to download an existing project;
    choose ~/deltachat-android as created in the "Build" chapter (Android Studio starts to
    build the project, however, there are some steps missing before this will

  5. As Delta Chat uses API 25 for some reasons, click on the corresponding error
    message and install "Nougat 7.1.1 (API 25)" and the "Build-Tools" (you should
    also find the option at "Tools / Android / SDK Manager / SDK Platforms").
    Now the build should succeed - but the app still misses the native part.

  6. Download Android NDK Revision 14b from
    NDK Archives
    (Newer releases shall not be used currently, they are not compatible,
    see issues #197, #220, #248) and unzip the archive which contains a single folder
    called android-ndk-r...; move this folder eg. to ~/android-ndk-r...

  7. Export the folder path to your environment as ANDROID_NDK and add it to PATH.
    You can archive this eg. by adding the following lines to .bashrc
    export ANDROID_NDK=/home/bpetersen/android-ndk-r...

The last two steps may be omitted by using the new Android Studio NDK options,
however, thus far, we have not found the time to do so.