fix(android): normalize Chaquopy Java list inputs for proxy config

android/app/src/main/python/android_proxy_bridge.py

@@ -18,7 +18,24 @@ def _remember_error(message: str) -> None:
 
 
 def _normalize_dc_ip_list(dc_ip_list: Iterable[object]) -> list[str]:
-    return [str(item).strip() for item in dc_ip_list if str(item).strip()]
+    if dc_ip_list is None:
+        return []
+
+    values: list[object]
+    try:
+        values = list(dc_ip_list)
+    except TypeError:
+        # Chaquopy may expose Kotlin's List<String> as java.util.ArrayList,
+        # which isn't always directly iterable from Python.
+        if hasattr(dc_ip_list, "toArray"):
+            values = list(dc_ip_list.toArray())
+        elif hasattr(dc_ip_list, "size") and hasattr(dc_ip_list, "get"):
+            size = int(dc_ip_list.size())
+            values = [dc_ip_list.get(i) for i in range(size)]
+        else:
+            values = [dc_ip_list]
+
+    return [str(item).strip() for item in values if str(item).strip()]
 
 
 def start_proxy(app_dir: str, host: str, port: int,

tests/test_android_proxy_bridge.py

@@ -0,0 +1,50 @@
+import sys
+import unittest
+from pathlib import Path
+
+
+sys.path.insert(0, str(
+    Path(__file__).resolve().parents[1] / "android" / "app" / "src" / "main" / "python"
+))
+
+import android_proxy_bridge  # noqa: E402
+
+
+class FakeJavaArrayList:
+    def __init__(self, items):
+        self._items = list(items)
+
+    def size(self):
+        return len(self._items)
+
+    def get(self, index):
+        return self._items[index]
+
+
+class AndroidProxyBridgeTests(unittest.TestCase):
+    def test_normalize_dc_ip_list_with_python_iterable(self):
+        result = android_proxy_bridge._normalize_dc_ip_list([
+            "2:149.154.167.220",
+            "  ",
+            "4:149.154.167.220 ",
+        ])
+
+        self.assertEqual(result, [
+            "2:149.154.167.220",
+            "4:149.154.167.220",
+        ])
+
+    def test_normalize_dc_ip_list_with_java_array_list_shape(self):
+        result = android_proxy_bridge._normalize_dc_ip_list(FakeJavaArrayList([
+            "2:149.154.167.220",
+            "4:149.154.167.220",
+        ]))
+
+        self.assertEqual(result, [
+            "2:149.154.167.220",
+            "4:149.154.167.220",
+        ])
+
+
+if __name__ == "__main__":
+    unittest.main()