🎧 Initial version of Android Studio project generation

build/android/BUILD.gn

Index: build/android/BUILD.gn
diff --git a/build/android/BUILD.gn b/build/android/BUILD.gn
index 066dd19479453f8259a07384ffbe10c365d50965..e1d4e9b02bb40fd9f911c90bf410829f5f4c026f 100644
--- a/build/android/BUILD.gn
+++ b/build/android/BUILD.gn
@@ -41,6 +41,19 @@ if (enable_java_templates) {
     input_jar = android_sdk_jar
     output_jar = "$root_out_dir/lib.java/android.interface.jar"
   }
+
+  _rebased_android_sdk_root = rebase_path(android_sdk_root, root_build_dir)
+
+  # Record GN vars that are needed by generate_gradle.py.
+  # One statement per-line to make GN's formatter leave it alone.
+  CR = "$0x0A"
+  _json = "{$CR"
+  _json += "  \"android_sdk_root\": \"$_rebased_android_sdk_root\",$CR"
+  _json += "  \"android_sdk_root\": \"$_rebased_android_sdk_root\",$CR"
+  _json += "  \"compile_sdk_version\": \"$android_sdk_version\",$CR"
+  _json += "  \"build_tools_version\": \"$android_sdk_build_tools_version\"$CR"
+  _json += "}$CR"
+  write_file("$root_build_dir/gradle/config.json", _json)
 }
 
 # Copy to the lib.unstripped directory so that gdb can easily find it.