add nix (#1213)

* add flake

* consolidate into flake.nix

* fix build

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -26,3 +26,5 @@ Branch-SDK-TestBed/gradlew
 Branch-SDK-TestBed/gradlew.bat
 
 Branch-SDK-TestBed/gradle/wrapper/gradle-wrapper.properties
+
+.direnv

Branch-SDK/build.gradle.kts

@@ -62,6 +62,7 @@ dependencies {
 }
 
 val VERSION_NAME: String by project
+val ANDROID_BUILD_TOOLS_VERSION: String by project
 val ANDROID_BUILD_SDK_VERSION_COMPILE: String by project
 val ANDROID_BUILD_SDK_VERSION_MINIMUM: String by project
 val VERSION_CODE: String by project
@@ -72,7 +73,7 @@ fun isReleaseBuild(): Boolean {
 
 android {
     compileSdk = ANDROID_BUILD_SDK_VERSION_COMPILE.toInt()
-
+    buildToolsVersion = ANDROID_BUILD_TOOLS_VERSION
     defaultConfig {
         minSdk = ANDROID_BUILD_SDK_VERSION_MINIMUM.toInt()
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"

flake.nix

@@ -0,0 +1,56 @@
+{
+  description = "Branch Android SDK for deep linking and attribution";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs";
+    flake-utils.url = "github:numtide/flake-utils";
+    android.url = "github:tadfisher/android-nixpkgs";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, android }: flake-utils.lib.eachSystem [ "aarch64-darwin" "x86_64-darwin" "x86_64-linux" ] (system:
+    let
+      inherit (nixpkgs) lib;
+      pkgs = import nixpkgs {
+        inherit system;
+        config.allowUnfree = true;
+        overlays = [
+          (final: prev: {
+            android-sdk = android.sdk.${system} (sdkPkgs: with sdkPkgs; [
+              build-tools-34-0-0
+              cmdline-tools-latest
+              emulator
+              platform-tools
+              platforms-android-34
+            ]
+            ++ lib.optionals (system == "aarch64-darwin") [
+              system-images-android-34-google-apis-arm64-v8a
+            ]
+            ++ lib.optionals (system == "x86_64-darwin" || system == "x86_64-linux") [
+              system-images-android-34-google-apis-x86-64
+            ]);
+          })
+        ];
+      };
+    in
+    {
+      formatter = pkgs.nixpkgs-fmt;
+      devShells = {
+        default = pkgs.mkShell {
+          name = "branch-sdk-android";
+          ANDROID_HOME = "${pkgs.android-sdk}/share/android-sdk";
+          ANDROID_SDK_ROOT = "${pkgs.android-sdk}/share/android-sdk";
+          JAVA_HOME = "${pkgs.jdk17.home}";
+          shellHook = ''
+            echo "
+            Entered the Branch SDK Android development environment.
+            ";
+          '';
+          packages = [
+            pkgs.android-sdk
+            pkgs.jdk17 # for android build-tools
+          ];
+        };
+      };
+    }
+  );
+}

gradle.properties

@@ -13,7 +13,7 @@ POM_LICENCE_DIST=repo
 POM_DEVELOPER_ID=branch
 POM_DEVELOPER_NAME=Branch Metrics
 
-ANDROID_BUILD_SDK_VERSION_MINIMUM=21
+ANDROID_BUILD_SDK_VERSION_MINIMUM=23
 ANDROID_BUILD_SDK_VERSION_COMPILE=34
 ANDROID_BUILD_TOOLS_VERSION=34.0.0
 android.useAndroidX=true