refactor(android): share node JSON param parsing helpers

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

@@ -33,10 +33,7 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.suspendCancellableCoroutine
 import kotlinx.coroutines.withTimeout
 import kotlinx.coroutines.withContext
-import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonObject
-import kotlinx.serialization.json.JsonPrimitive
-import kotlinx.serialization.json.contentOrNull
 import java.io.ByteArrayOutputStream
 import java.io.File
 import java.util.concurrent.Executor
@@ -101,7 +98,7 @@ class CameraCaptureManager(private val context: Context) {
     withContext(Dispatchers.Main) {
       ensureCameraPermission()
       val owner = lifecycleOwner ?: throw IllegalStateException("UNAVAILABLE: camera not ready")
-      val params = parseParamsObject(paramsJson)
+      val params = parseJsonParamsObject(paramsJson)
       val facing = parseFacing(params) ?: "front"
       val quality = (parseQuality(params) ?: 0.95).coerceIn(0.1, 1.0)
       val maxWidth = parseMaxWidth(params) ?: 1600
@@ -167,7 +164,7 @@ class CameraCaptureManager(private val context: Context) {
     withContext(Dispatchers.Main) {
       ensureCameraPermission()
       val owner = lifecycleOwner ?: throw IllegalStateException("UNAVAILABLE: camera not ready")
-      val params = parseParamsObject(paramsJson)
+      val params = parseJsonParamsObject(paramsJson)
       val facing = parseFacing(params) ?: "front"
       val durationMs = (parseDurationMs(params) ?: 3_000).coerceIn(200, 60_000)
       val includeAudio = parseIncludeAudio(params) ?: true
@@ -293,20 +290,8 @@ class CameraCaptureManager(private val context: Context) {
     return rotated
   }
 
-  private fun parseParamsObject(paramsJson: String?): JsonObject? {
-    if (paramsJson.isNullOrBlank()) return null
-    return try {
-      Json.parseToJsonElement(paramsJson).asObjectOrNull()
-    } catch (_: Throwable) {
-      null
-    }
-  }
-
-  private fun readPrimitive(params: JsonObject?, key: String): JsonPrimitive? =
-    params?.get(key) as? JsonPrimitive
-
   private fun parseFacing(params: JsonObject?): String? {
-    val value = readPrimitive(params, "facing")?.contentOrNull?.trim()?.lowercase() ?: return null
+    val value = parseJsonString(params, "facing")?.trim()?.lowercase() ?: return null
     return when (value) {
       "front", "back" -> value
       else -> null
@@ -314,31 +299,21 @@ class CameraCaptureManager(private val context: Context) {
   }
 
   private fun parseQuality(params: JsonObject?): Double? =
-    readPrimitive(params, "quality")?.contentOrNull?.toDoubleOrNull()
+    parseJsonDouble(params, "quality")
 
   private fun parseMaxWidth(params: JsonObject?): Int? =
-    readPrimitive(params, "maxWidth")
-      ?.contentOrNull
-      ?.toIntOrNull()
+    parseJsonInt(params, "maxWidth")
       ?.takeIf { it > 0 }
 
   private fun parseDurationMs(params: JsonObject?): Int? =
-    readPrimitive(params, "durationMs")?.contentOrNull?.toIntOrNull()
+    parseJsonInt(params, "durationMs")
 
   private fun parseDeviceId(params: JsonObject?): String? =
-    readPrimitive(params, "deviceId")
-      ?.contentOrNull
+    parseJsonString(params, "deviceId")
       ?.trim()
       ?.takeIf { it.isNotEmpty() }
 
-  private fun parseIncludeAudio(params: JsonObject?): Boolean? {
-    val value = readPrimitive(params, "includeAudio")?.contentOrNull?.trim()?.lowercase()
-    return when (value) {
-      "true" -> true
-      "false" -> false
-      else -> null
-    }
-  }
+  private fun parseIncludeAudio(params: JsonObject?): Boolean? = parseJsonBooleanFlag(params, "includeAudio")
 
   private fun Context.mainExecutor(): Executor = ContextCompat.getMainExecutor(this)
 

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

@@ -1,10 +1,12 @@
 package ai.openclaw.android.node
 
 import ai.openclaw.android.gateway.parseInvokeErrorFromThrowable
+import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonElement
 import kotlinx.serialization.json.JsonNull
 import kotlinx.serialization.json.JsonObject
 import kotlinx.serialization.json.JsonPrimitive
+import kotlinx.serialization.json.contentOrNull
 
 const val DEFAULT_SEAM_COLOR_ARGB: Long = 0xFF4F7A9A
 
@@ -21,6 +23,35 @@ fun String.toJsonString(): String {
 
 fun JsonElement?.asObjectOrNull(): JsonObject? = this as? JsonObject
 
+fun parseJsonParamsObject(paramsJson: String?): JsonObject? {
+  if (paramsJson.isNullOrBlank()) return null
+  return try {
+    Json.parseToJsonElement(paramsJson).asObjectOrNull()
+  } catch (_: Throwable) {
+    null
+  }
+}
+
+fun readJsonPrimitive(params: JsonObject?, key: String): JsonPrimitive? = params?.get(key) as? JsonPrimitive
+
+fun parseJsonInt(params: JsonObject?, key: String): Int? =
+  readJsonPrimitive(params, key)?.contentOrNull?.toIntOrNull()
+
+fun parseJsonDouble(params: JsonObject?, key: String): Double? =
+  readJsonPrimitive(params, key)?.contentOrNull?.toDoubleOrNull()
+
+fun parseJsonString(params: JsonObject?, key: String): String? =
+  readJsonPrimitive(params, key)?.contentOrNull
+
+fun parseJsonBooleanFlag(params: JsonObject?, key: String): Boolean? {
+  val value = readJsonPrimitive(params, key)?.contentOrNull?.trim()?.lowercase() ?: return null
+  return when (value) {
+    "true" -> true
+    "false" -> false
+    else -> null
+  }
+}
+
 fun JsonElement?.asStringOrNull(): String? =
   when (this) {
     is JsonNull -> null

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

@@ -10,10 +10,7 @@ import ai.openclaw.android.ScreenCaptureRequester
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.withContext
-import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonObject
-import kotlinx.serialization.json.JsonPrimitive
-import kotlinx.serialization.json.contentOrNull
 import java.io.File
 import kotlin.math.roundToInt
 
@@ -39,7 +36,7 @@ class ScreenRecordManager(private val context: Context) {
             "SCREEN_PERMISSION_REQUIRED: grant Screen Recording permission",
           )
 
-      val params = parseParamsObject(paramsJson)
+      val params = parseJsonParamsObject(paramsJson)
       val durationMs = (parseDurationMs(params) ?: 10_000).coerceIn(250, 60_000)
       val fps = (parseFps(params) ?: 10.0).coerceIn(1.0, 60.0)
       val fpsInt = fps.roundToInt().coerceIn(1, 60)
@@ -146,38 +143,19 @@ class ScreenRecordManager(private val context: Context) {
     }
   }
 
-  private fun parseParamsObject(paramsJson: String?): JsonObject? {
-    if (paramsJson.isNullOrBlank()) return null
-    return try {
-      Json.parseToJsonElement(paramsJson).asObjectOrNull()
-    } catch (_: Throwable) {
-      null
-    }
-  }
-
-  private fun readPrimitive(params: JsonObject?, key: String): JsonPrimitive? =
-    params?.get(key) as? JsonPrimitive
-
   private fun parseDurationMs(params: JsonObject?): Int? =
-    readPrimitive(params, "durationMs")?.contentOrNull?.toIntOrNull()
+    parseJsonInt(params, "durationMs")
 
   private fun parseFps(params: JsonObject?): Double? =
-    readPrimitive(params, "fps")?.contentOrNull?.toDoubleOrNull()
+    parseJsonDouble(params, "fps")
 
   private fun parseScreenIndex(params: JsonObject?): Int? =
-    readPrimitive(params, "screenIndex")?.contentOrNull?.toIntOrNull()
+    parseJsonInt(params, "screenIndex")
 
-  private fun parseIncludeAudio(params: JsonObject?): Boolean? {
-    val value = readPrimitive(params, "includeAudio")?.contentOrNull?.trim()?.lowercase()
-    return when (value) {
-      "true" -> true
-      "false" -> false
-      else -> null
-    }
-  }
+  private fun parseIncludeAudio(params: JsonObject?): Boolean? = parseJsonBooleanFlag(params, "includeAudio")
 
   private fun parseString(params: JsonObject?, key: String): String? =
-    readPrimitive(params, key)?.contentOrNull
+    parseJsonString(params, key)
 
   private fun estimateBitrate(width: Int, height: Int, fps: Int): Int {
     val pixels = width.toLong() * height.toLong()