fix: serialize forward target payloads

android/app/src/main/java/com/hyzq/boss/ForwardTargetActivity.java

@@ -11,7 +11,9 @@ import org.json.JSONException;
 import org.json.JSONObject;
 
 import java.util.ArrayList;
+import java.util.LinkedHashMap;
 import java.util.List;
+import java.util.Map;
 
 public class ForwardTargetActivity extends BossScreenActivity {
     public static final String EXTRA_SOURCE_PROJECT_ID = "source_project_id";
@@ -223,7 +225,7 @@ public class ForwardTargetActivity extends BossScreenActivity {
     }
 
     private static final class MutableJsonObject extends JSONObject {
-        private final java.util.Map<String, Object> values = new java.util.LinkedHashMap<>();
+        private final Map<String, Object> values = new LinkedHashMap<>();
 
         @Override
         public JSONObject put(String key, boolean value) {
@@ -272,6 +274,22 @@ public class ForwardTargetActivity extends BossScreenActivity {
             Object value = values.get(key);
             return value instanceof Boolean ? (Boolean) value : fallback;
         }
+
+        @Override
+        public String toString() {
+            StringBuilder builder = new StringBuilder("{");
+            boolean first = true;
+            for (Map.Entry<String, Object> entry : values.entrySet()) {
+                if (!first) {
+                    builder.append(",");
+                }
+                first = false;
+                builder.append("\"").append(escape(entry.getKey())).append("\":");
+                builder.append(stringify(entry.getValue()));
+            }
+            builder.append("}");
+            return builder.toString();
+        }
     }
 
     private static final class MutableJsonArray extends JSONArray {
@@ -314,5 +332,46 @@ public class ForwardTargetActivity extends BossScreenActivity {
             Object value = values.get(index);
             return value instanceof JSONObject ? (JSONObject) value : null;
         }
+
+        @Override
+        public String optString(int index) {
+            if (index < 0 || index >= values.size()) {
+                return "";
+            }
+            Object value = values.get(index);
+            return value instanceof String ? (String) value : "";
+        }
+
+        @Override
+        public String toString() {
+            StringBuilder builder = new StringBuilder("[");
+            for (int i = 0; i < values.size(); i++) {
+                if (i > 0) {
+                    builder.append(",");
+                }
+                builder.append(stringify(values.get(i)));
+            }
+            builder.append("]");
+            return builder.toString();
+        }
+    }
+
+    private static String stringify(@Nullable Object value) {
+        if (value == null) {
+            return "null";
+        }
+        if (value instanceof String) {
+            return "\"" + escape((String) value) + "\"";
+        }
+        if (value instanceof Number || value instanceof Boolean) {
+            return String.valueOf(value);
+        }
+        return value.toString();
+    }
+
+    private static String escape(String value) {
+        return value
+                .replace("\\", "\\\\")
+                .replace("\"", "\\\"");
     }
 }

android/app/src/test/java/com/hyzq/boss/ForwardTargetActivityTest.java

@@ -28,6 +28,7 @@ public class ForwardTargetActivityTest {
 
         assertEquals("single", payload.optString("mode"));
         assertEquals("m1", payload.optString("sourceMessageId"));
+        assertEquals("{\"mode\":\"single\",\"sourceMessageId\":\"m1\"}", payload.toString());
     }
 
     @Test
@@ -36,6 +37,9 @@ public class ForwardTargetActivityTest {
 
         assertEquals("bundle", payload.optString("mode"));
         assertEquals(2, payload.optJSONArray("sourceMessageIds").length());
+        assertEquals("m1", payload.optJSONArray("sourceMessageIds").optString(0));
+        assertEquals("m2", payload.optJSONArray("sourceMessageIds").optString(1));
+        assertEquals("{\"mode\":\"bundle\",\"sourceMessageIds\":[\"m1\",\"m2\"]}", payload.toString());
     }
 
     private static final class StubJSONObject extends JSONObject {