refactor(android): reuse node JSON param parser (#120456)

apps/android/app/src/main/java/ai/openclaw/app/node/NotificationsHandler.kt

@@ -2,7 +2,6 @@ package ai.openclaw.app.node
 
 import ai.openclaw.app.gateway.GatewaySession
 import android.content.Context
-import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonArray
 import kotlinx.serialization.json.JsonObject
 import kotlinx.serialization.json.JsonPrimitive
@@ -68,7 +67,7 @@ class NotificationsHandler private constructor(
     readSnapshotWithRebind()
 
     val params =
-      parseParamsObject(paramsJson)
+      parseJsonParamsObject(paramsJson)
         ?: return GatewaySession.InvokeResult.error(
           code = "INVALID_REQUEST",
           message = "INVALID_REQUEST: expected JSON object",
@@ -153,15 +152,6 @@ class NotificationsHandler private constructor(
       )
     }.toString()
 
-  private fun parseParamsObject(paramsJson: String?): JsonObject? {
-    if (paramsJson.isNullOrBlank()) return null
-    return try {
-      Json.parseToJsonElement(paramsJson).asObjectOrNull()
-    } catch (_: Throwable) {
-      null
-    }
-  }
-
   private fun readString(
     params: JsonObject,
     key: String,

apps/android/app/src/main/java/ai/openclaw/app/node/SystemHandler.kt

@@ -13,8 +13,6 @@ import android.os.Build
 import androidx.core.app.NotificationCompat
 import androidx.core.app.NotificationManagerCompat
 import androidx.core.content.ContextCompat
-import kotlinx.serialization.json.Json
-import kotlinx.serialization.json.JsonObject
 import kotlinx.serialization.json.JsonPrimitive
 import kotlinx.serialization.json.contentOrNull
 
@@ -163,7 +161,7 @@ class SystemHandler private constructor(
   }
 
   private fun parseNotifyRequest(paramsJson: String?): SystemNotifyRequest? {
-    val params = parseParamsObject(paramsJson) ?: return null
+    val params = parseJsonParamsObject(paramsJson) ?: return null
     // title/body are required by the gateway contract; optional fields only
     // influence Android channel/silence behavior.
     val rawTitle =
@@ -184,15 +182,6 @@ class SystemHandler private constructor(
     )
   }
 
-  private fun parseParamsObject(paramsJson: String?): JsonObject? {
-    if (paramsJson.isNullOrBlank()) return null
-    return try {
-      Json.parseToJsonElement(paramsJson).asObjectOrNull()
-    } catch (_: Throwable) {
-      null
-    }
-  }
-
   companion object {
     /** Creates a handler with a fake poster for parser and authorization tests. */
     internal fun forTesting(poster: SystemNotificationPoster): SystemHandler = SystemHandler(poster)