Building on Android

There are two versions: with QT and without QT.

Pre-requisites

You need to install Android SDK and NDK. For QT version, you also need QT with android support.

SDK (choose command line tools only, and make sure you installed "Android SDK Build-Tools")
NDK
QT(for QT only). Choose one for your platform for android. For example QT 5.6 under Linux would be this file

You also need Java JDK (prefer Oracle Java 8), Ant and latest Gradle (min version 3.4).

QT-Creator (for QT only)

Open QT-creator that should be installed with QT. Go to Settings/Android and specify correct paths to SDK and NDK. If everything is correct you will see two set available: Android for armeabi-v7a (gcc, qt) and Android for x86 (gcc, qt).

Dependencies

Take following pre-compiled binaries from PurpleI2P's repositories.

git clone https://github.com/PurpleI2P/Boost-for-Android-Prebuilt.git -b boost-1_72_0
git clone https://github.com/PurpleI2P/OpenSSL-for-Android-Prebuilt.git
git clone https://github.com/PurpleI2P/MiniUPnP-for-Android-Prebuilt.git
git clone https://github.com/PurpleI2P/android-ifaddrs.git

Prepare Android SDK and install required packages

mkdir android-sdk
cd android-sdk
wget -t0 <link to latest SDK from Android site>
unzip commandlinetools-XXXXXX-XXXXXX.zip -d cmdline-tools
./cmdline-tools/tools/bin/sdkmanager "build-tools;25.0.3" "platforms;android-14" "platforms;android-25" "platform-tools"

Building the app with QT

Open qt/i2pd_qt/i2pd_qt.pro in the QT-creator
Change line MAIN_PATH = /path/to/libraries to an actual path where you put the dependencies to
Select appropriate project (usually armeabi-v7a) and build
You will find an .apk file in android-build/bin folder

Building the app without QT

Change line I2PD_LIBS_PATH in android/jni/Application.mk to an actual path where you put the dependencies to
Create or edit file 'local.properties'. Place 'sdk.dir=<path to SDK>' and 'ndk.dir=<path to NDK>'
Run gradle clean cleanBuildCache assembleDebug from android folder
You will find an .apk file in android/build/outputs/apk folder

Creating release .apk

In order to create release .apk you must obtain a Java keystore file(.jks). Either you have in already, or you can generate it yourself using keytool, or from one of you existing well-known certificates. For example, i2pd release are signed with this certificate.

Change file 'build.gradle':

--- a/android/build.gradle
+++ b/android/build.gradle
@@ -46,11 +46,17 @@ android {
             keyAlias "i2pdapk"
             keyPassword "android"
         }
+        release {
+            storeFile file("path to .jks")
+            storePassword "Store Password"
+            keyAlias "alias"
+            keyPassword "Key Passwordq"
+        }
     }
     buildTypes {
         release {
             minifyEnabled true
-            signingConfig signingConfigs.orignal
+            signingConfig signingConfigs.release

Run gradle clean cleanBuildCache assembleRelease

Building executable android binary

Change line I2PD_LIBS_PATH in android_binary_only/jni/Application.mk to an actual path where you put the dependencies to
Run ndk-build -j <threads> from android_binary_only folder
You will find an i2pd executable in android_binary_only/libs/armeabi-v7a folder

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