implement getAllKeys

Author: nkmrh

example/lib/variables.dart

@@ -106,6 +106,22 @@ class _VariablesState extends State<VariablesScreen> {
               Variables.fetch().then((value) async {
                 print("variables fetch completed!");
                 await checkVariables();
+                List allKeys = await Variables.getAllKeys();
+                showDialog(
+                  context: context,
+                  builder: (BuildContext context) {
+                    return AlertDialog(
+                      title: Text("Fetch Succeeded. Keys:"),
+                      content: Text(allKeys.join(',')),
+                      actions: [
+                        TextButton(
+                          onPressed: () => Navigator.pop(context),
+                          child: Text("OK")
+                        ),
+                      ],
+                    );
+                  }
+                );
               });
             },
             child: Text("Fetch Variables"),

karte_variables/android/src/main/java/io/karte/flutter/variables/KarteVariablesPlugin.java

@@ -128,6 +128,9 @@ public void run() {
                 Variables.trackOpen(variables, values);
                 result.success(null);
                 break;
+            case "getAllKeys":
+                result.success(Variables.getAllKeys());
+                break;
             case "clearCache":
                 key = call.argument("key");
                 if (key == null) {

karte_variables/ios/Classes/SwiftKarteVariablesPlugin.swift

@@ -63,6 +63,8 @@ public class SwiftKarteVariablesPlugin: NSObject, FlutterPlugin {
                 let values = convertValues(arguments["values"])
                 Tracker.trackClick(variables: variables, values: values)
                 result(nil)
+            case "getAllKeys":
+                result(Variables.getAllKeys())
             case "clearCache":
                 let key = arguments["key"] as? String ?? ""
                 Variables.clearCache(forKey: key)

karte_variables/lib/karte_variables.dart

@@ -62,6 +62,16 @@ class Variables {
         'Variables_trackClick', {"variableNames": names, "values": normalize(values)});
   }
 
+  /// 全ての設定値のキーの一覧を取得します。
+  /// なお事前に `Variables.fetch()` を呼び出しておく必要があります。
+  static Future<List<String>> getAllKeys() async {
+    final result = await _channel.invokeMethod('Variables_getAllKeys');
+    if (result == null) {
+      return [];
+    }
+    return result.whereType<String>().toList();
+  }
+
   /// 指定した設定値のキーのキャッシュを削除します。
   static void clearCache(String key) async {
     await _channel.invokeMethod('Variables_clearCache', {"key": key});