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Download the latest build for Android from 2016. Or build mailcore on Android:

Build for Android

The below instruction allows to build mailcore with its needed dependencies on macOS (when followed exactly in this order).

Compile libetpan

  • Download https://github.com/dinhvh/libetpan/releases/tag/1.9.4 in version 1.9.4 (which fixes exception in QUOTA operation): Make sure in this libetpan path are not spaces, this causes random compile errors
  • Download Android NDK 17
  • Download Android SDK 16 and SDK 21
  • Set ENV-vars to your NDK/SDK root folder
  • Set ENV-vars to your NDK/SDK root folder
export ANDROID_NDK=/Users/xxx/Library/Android/sdk/ndk/17.2.4988734
export ANDROID_SDK=/Users/xxx/Library/Android/sdk
  1. Compile openssl:
  • cd build-android/dependencies/openssl
  • build.sh: Change version in line 4 to most recent 1.0.2xxx, see https://ftp.openssl.org/source/old/1.0.2/. e.g. "1.0.2u"
  • ./build.sh (Ignore that we get several errors regarding "cryptlib.h:62:21: fatal error: stdlib.h: No such file or directory" / "cp: libcrypto.a: No such file or directory" / "cp: libssl.a: No such file or directory". If the generated openssl-android-3.zip has e.g. 408KB and contains some h-files (but no so files), we are fine.)
  1. Compile iconv (probably not needed when removing "-DHAVE_ICONV=1" later)
  • cd build-android/dependencies/iconv
  • ./build.sh
  1. Compile cyrus-sasl
  • cd build-mac/dependencies
  • prepare-cyrus-sasl.sh: Change version in line 5 to version=2.1.26 (to match version with build-android/dependencies/cyrus-sasl/build.sh)
  • ./prepare-cyrus-sasl.sh (can be quitted after "building tools" is printed)
  • cd build-android/dependencies/cyrus-sasl
  • ./build.sh
  1. Compile libetpan
  • ./autogen && make to generate libetpan-config.h (Ignore that we error at make, we just need the libetpan-config.h file)
  • cd build-android
  • jni/Android.mk: Remove "-DHAVE_ICONV=1" in LOCAL_CFLAGS (line 131) (don't set it to 0 but remove it altogether) to build without iconv
  • ./build.sh

Compile libmailcore

  • Download https://github.com/MailCore/mailcore2 (commit fad23d736ed5a63cf8321469d3a98a583f55df97 works definitely with this instruction): Make sure in this mailcore2 path are not spaces, this causes random compile errors
  • cd build-android
  • build.sh: Change libetpan version to 7
  • build.sh: Change -source 1.6 -target 1.6 to -source 1.8 -target 1.8
  • mkdir third-party
  • Copy libetpan-android-7.zip (from step "Compile libetpan") to third-party folder and extract it
  • ./build.sh

Shrink mailcore (by removing unnecessary files to reduce 50% of file size)

  • cd to the directory where mailcore2-android-4.aar is located
  • Execute
unzip mailcore2-android-4.aar -d mailcore-unzipped
rm mailcore2-android-4.aar
cd mailcore-unzipped
unzip classes.jar -d classes-unzipped
rm -rf classes-unzipped/jni
rm classes.jar
jar cvf classes.jar -C classes-unzipped/ .
rm -rf classes-unzipped
cd ..
jar cvf mailcore2-android-4.aar -C mailcore-unzipped/ .
rm -rf mailcore-unzipped
  • Copy shrinked mailcore2-android-4.aar to android project and test it on real devices

Troubleshooting

  • Openssl can't be downloaded: adapt letter in version based on latest release in https://ftp.openssl.org/source/ or https://ftp.openssl.org/source/old/1.0.2/
  • Compile openssl 1.0.2u with NDK 17 and libsasl 2.1.26
  • Compile openssl 1.1.1k with NDK 20 and libsasl 2.1.27
  • openssl compile error "aarch64-linux-android-gcc: No such file or directory": Make sure to use correct NDK
  • Android Looper/Handler or android.os package not found: Make sure to install all needed Android SDK versions in Android Studio
  • "Missing archive cyrus-sasl-2.1.26": Make sure to run prepare-cyrus-sasl.sh first
  • Build scripts don't always exit on errors: Manually search for "error:" or other errors
  • Missing gnustl_shared: Install & use Android NDK 17 (version 18 removed some GCC stuff)
  • https://stackoverflow.com/a/31534327/3997741 (but with "include" instead of "includes") (and in build-android in libetpan: cp find . -name '*.h' ../../mailcore2-master/build-android/include/MailCore
  • 'libetpan-config.h' file not found: Run ./autogen.sh && make first
  • sasl/sasl.h not found: cd build-mac/dependencies && ./prepare-cyrus-sasl.sh
  • "Configuring OpenSSL version" missing: make sure to use current 1.1.1xxx/1.0.2xxx openssl version
  • "no sysroot" while building openssl: use Android NDK 20 instead of 17
  • error: variable has incomplete type 'HMAC_CTX' (aka 'struct hmac_ctx_st'): use sasl 2.1.27 instead of 2.1.26 in build-mac/dependencies/prepare-cyrus-sasl.sh and build-android/dependencies/cyrus-sasl/build.sh
  • Buildscripts can't run: Call them with bash build.sh (even when starting with "#! /bin/sh")
  • iconv stuff not found when linking: you missed the step to remove "-DHAVE_ICONV=1"

Running example

Copy the binary result of the build (mailcore2-android-version.aar) to mailcore2/example/android/AndroidExample/app/libs.

  • Open the example in Android Studio
  • Tweaks the login and password in the class MessagesSyncManager
  • Then, run it.