androidenv: Allow multiple ndkVersions to be specified

Android is deprecating ndk.dir in favor of specifying exact NDK
version in Gradle configuration. Ensure that we can support multiple
NDKs, and link them into the location the Android Gradle Plugin expects.

pkgs/development/mobile/androidenv/compose-android-packages.nix

@@ -3,10 +3,10 @@
 }:
 
 { toolsVersion ? "26.1.1"
-, platformToolsVersion ? "30.0.5"
+, platformToolsVersion ? "31.0.2"
 , buildToolsVersions ? [ "30.0.3" ]
 , includeEmulator ? false
-, emulatorVersion ? "30.3.4"
+, emulatorVersion ? "30.6.3"
 , platformVersions ? []
 , includeSources ? false
 , includeSystemImages ? false
@@ -14,7 +14,8 @@
 , abiVersions ? [ "armeabi-v7a" ]
 , cmakeVersions ? [ ]
 , includeNDK ? false
-, ndkVersion ? "22.0.7026061"
+, ndkVersion ? "22.1.7171670"
+, ndkVersions ? [ndkVersion]
 , useGoogleAPIs ? false
 , useGoogleTVAddOns ? false
 , includeExtras ? []
@@ -175,10 +176,18 @@ rec {
     }
   ) cmakeVersions;
 
-  ndk-bundle = import ./ndk-bundle {
-    inherit deployAndroidPackage os autoPatchelfHook makeWrapper pkgs pkgsHostHost lib platform-tools;
-    package = packages.ndk-bundle.${ndkVersion};
-  };
+  # Creates a NDK bundle.
+  makeNdkBundle = ndkVersion:
+    import ./ndk-bundle {
+      inherit deployAndroidPackage os autoPatchelfHook makeWrapper pkgs pkgsHostHost lib platform-tools;
+      package = packages.ndk-bundle.${ndkVersion};
+    };
+
+  # All NDK bundles.
+  ndk-bundles = if includeNDK then map makeNdkBundle ndkVersions else [];
+
+  # The "default" NDK bundle.
+  ndk-bundle = if includeNDK then lib.findFirst (x: x != null) null ndk-bundles else null;
 
   google-apis = map (version:
     deployAndroidPackage {
@@ -203,6 +212,15 @@ rec {
       '') plugins}
     '';
 
+  # Function that automatically links all NDK plugins.
+  linkNdkPlugins = {name, plugins, rootName ? name}:
+    lib.optionalString (plugins != []) ''
+      mkdir -p ${rootName}
+      ${lib.concatMapStrings (plugin: ''
+        ln -s ${plugin}/libexec/android-sdk/${name} ${rootName}/${plugin.version}
+      '') plugins}
+    '';
+
   # Function that automatically links a plugin for which only one version exists
   linkPlugin = {name, plugin, check ? true}:
     lib.optionalString check ''
@@ -233,13 +251,13 @@ rec {
 
     postInstall = ''
       # Symlink all requested plugins
-
       ${linkPlugin { name = "platform-tools"; plugin = platform-tools; }}
       ${linkPlugins { name = "build-tools"; plugins = build-tools; }}
       ${linkPlugin { name = "emulator"; plugin = emulator; check = includeEmulator; }}
       ${linkPlugins { name = "platforms"; plugins = platforms; }}
       ${linkPlatformPlugins { name = "sources"; plugins = sources; check = includeSources; }}
       ${linkPlugins { name = "cmake"; plugins = cmake; }}
+      ${linkNdkPlugins { name = "ndk-bundle"; rootName = "ndk"; plugins = ndk-bundles; }}
       ${linkPlugin { name = "ndk-bundle"; plugin = ndk-bundle; check = includeNDK; }}
 
       ${lib.optionalString includeSystemImages ''