Update README.md

README.md

@@ -1,19 +1,55 @@
+[![GitHub release](https://img.shields.io/github/release/PurpleI2P/i2pd-android.svg?label=latest%20release)](https://github.com/PurpleI2P/i2pd-android/releases/latest)
+[![License](https://img.shields.io/github/license/PurpleI2P/i2pd-android.svg)](https://github.com/PurpleI2P/i2pd-android/blob/openssl/LICENSE)
+[![Android CI](https://github.com/PurpleI2P/i2pd-android/actions/workflows/android.yml/badge.svg)](https://github.com/PurpleI2P/i2pd-android/actions/workflows/android.yml)
+
 # i2pd android
 
-### Install OpenJDK, gradle 5.1+ (6.8.3 has been tested and is working ok), download Android SDK and NDK r21e
-https://gradle.org/install/
+This repository contains Android application sources of i2pd
+
+## How to build
+
+### Install OpenJDK, g++, rename (used for building modules), gradle 5.1+, download Android SDK
+
+```bash
+sudo apt-get install g++ rename gradle
+```
+
+Android SDK Available here:
 
 https://developer.android.com/studio#downloads
 
-https://developer.android.com/ndk/
+If your system provides gradle with version < 5.1, download it from gradle homepage:
+
+https://gradle.org/install/
+
+### Prepare Android SDK for building
+Download Android SDK, unpack it to any directory (`/opt/anrdoid-sdk` for example) and install required packages
+```bash
+mkdir /opt/android-sdk
+cd /opt/android-sdk
+wget https://dl.google.com/android/repository/commandlinetools-linux-8092744_latest.zip
+unzip commandlinetools-linux-8092744_latest.zip
+# install required tools
+./cmdline-tools/bin/sdkmanager --sdk_root=/opt/android-sdk "build-tools;29.0.3" "cmake;3.10.2.4988404" "ndk;23.1.7779620"
+```
 
 ### Clone repository with submodules
-    git clone --recurse-submodules https://github.com/PurpleI2P/i2pd-android.git
+```bash
+git clone --recurse-submodules https://github.com/PurpleI2P/i2pd-android.git
+```
 
 ### Compile application
-    export ANDROID_SDK_ROOT=/opt/android-sdk
-    export ANDROID_NDK_HOME=/opt/android-ndk-r21e
-    
-    gradle clean assembleDebug
+```bash
+export ANDROID_SDK_ROOT=/opt/android-sdk
+export ANDROID_NDK_HOME=$ANDROID_SDK_ROOT/ndk/23.1.7779620
+
+pushd app/jni
+./build_boost.sh
+./build_openssl.sh
+./build_miniupnpc.sh
+popd
+
+gradle clean assembleDebug
+```
 
 You will find APKs in `app/build/outputs/apk`