android-dev-env-cli.nix

{ pkgs ? import <nixpkgs> {} }:

with pkgs;

let
  # Define the required packages
  androidSdk = androidsdk;
  androidNdk = androidndk;
  openjdk = adoptopenjdk11;
  buildToolsVersion = "30.0.3";

  # Define the environment variables required by the Android SDK and NDK
  androidSdkEnv = {
    ANDROID_HOME = "${androidSdk}/share/android-sdk";
    ANDROID_NDK_HOME = "${androidNdk}/share/android-ndk";
  };
in

mkShell {
  # Specify the required inputs
  buildInputs = [
    androidSdk
    androidNdk
    openjdk
    git
    wget
    unzip
    zipalign
    apksigner
  ];

  # Set the required environment variables and accept the Android SDK licenses
  shellHook = ''
    export ${androidSdkEnv.ANDROID_HOME}
    export ${androidSdkEnv.ANDROID_NDK_HOME}
    yes | ${androidSdk}/bin/sdkmanager --licenses
  '';

  # Define a function to build the APK from source
  buildApk = packageName: {
    # Clone the project from Git
    git clone https://github.com/user/project.git
    cd project

    # Download and extract the required dependencies
    wget https://downloads.gradle-dn.com/distributions/gradle-7.2-bin.zip
    unzip gradle-7.2-bin.zip

    # Build the APK
    ${androidSdk}/bin/sdkmanager --update
    ${androidSdk}/bin/sdkmanager "platform-tools" "build-tools;${buildToolsVersion}"
    ${androidSdk}/bin/sdkmanager "platforms;android-30"
    export PATH=$PWD/gradle-7.2/bin:$PATH
    ./gradlew assembleRelease

    # Sign the APK
    apksigner sign --ks /path/to/keystore --ks-key-alias mykey --out app-release-signed.apk app-release-unsigned.apk

    # Align the APK
    zipalign -v 4 app-release-signed.apk app-release-aligned.apk

    # Clean up
    rm app-release-unsigned.apk
    rm app-release-signed.apk
  };

  # Build the APK for the specified package name
  buildApk "com.example.app";
}