diff --git a/app/src/main/java/com/casic/app/safetreecontroller/extensions/ByteArray.kt b/app/src/main/java/com/casic/app/safetreecontroller/extensions/ByteArray.kt
index cd72aed..b1cf8ae 100644
--- a/app/src/main/java/com/casic/app/safetreecontroller/extensions/ByteArray.kt
+++ b/app/src/main/java/com/casic/app/safetreecontroller/extensions/ByteArray.kt
@@ -27,36 +27,20 @@
     return builder.toString()
 }
 
-fun ByteArray.handleGasConcentration(): Long {
+fun ByteArray.handleGasConcentration(): Int {
     /**
      * [1, 0, 0, 0, 13, 14]
      * */
     //负值需要计算补码
-    val x = if (this[1] < 0) {
-        this[1].toInt() and 0xFF
-    } else {
-        this[1].toInt()
-    }
-    val y = if (this[2] < 0) {
-        this[2].toInt() and 0xFF
-    } else {
-        this[2].toInt()
-    }
-    val z = if (this[3] < 0) {
-        this[3].toInt() and 0xFF
-    } else {
-        this[3].toInt()
-    }
-    return (x * 65536 + y * 256 + z).toLong()
+    val x = this[1] and 0xFF.toByte()
+    val y = this[2] and 0xFF.toByte()
+    val z = this[3] and 0xFF.toByte()
+    return (x * 65536 + y * 256 + z)
 }
 
 fun ByteArray.handleCpuTemperature(): Float {
     //[1, -128, 24]
     val x = this[0] and 0xFF.toByte()
-    val y = if (this[1] < 0) {
-        this[1].toInt() and 0xFF
-    } else {
-        this[1].toInt()
-    }
+    val y = this[1] and 0xFF.toByte()
     return (x * 256 + y) / 10f
 }
\ No newline at end of file

diff --git a/app/src/main/java/com/casic/app/safetreecontroller/extensions/ByteArray.kt b/app/src/main/java/com/casic/app/safetreecontroller/extensions/ByteArray.kt
index cd72aed..b1cf8ae 100644
--- a/app/src/main/java/com/casic/app/safetreecontroller/extensions/ByteArray.kt
+++ b/app/src/main/java/com/casic/app/safetreecontroller/extensions/ByteArray.kt
@@ -27,36 +27,20 @@
     return builder.toString()
 }
 
-fun ByteArray.handleGasConcentration(): Long {
+fun ByteArray.handleGasConcentration(): Int {
     /**
      * [1, 0, 0, 0, 13, 14]
      * */
     //负值需要计算补码
-    val x = if (this[1] < 0) {
-        this[1].toInt() and 0xFF
-    } else {
-        this[1].toInt()
-    }
-    val y = if (this[2] < 0) {
-        this[2].toInt() and 0xFF
-    } else {
-        this[2].toInt()
-    }
-    val z = if (this[3] < 0) {
-        this[3].toInt() and 0xFF
-    } else {
-        this[3].toInt()
-    }
-    return (x * 65536 + y * 256 + z).toLong()
+    val x = this[1] and 0xFF.toByte()
+    val y = this[2] and 0xFF.toByte()
+    val z = this[3] and 0xFF.toByte()
+    return (x * 65536 + y * 256 + z)
 }
 
 fun ByteArray.handleCpuTemperature(): Float {
     //[1, -128, 24]
     val x = this[0] and 0xFF.toByte()
-    val y = if (this[1] < 0) {
-        this[1].toInt() and 0xFF
-    } else {
-        this[1].toInt()
-    }
+    val y = this[1] and 0xFF.toByte()
     return (x * 256 + y) / 10f
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/casic/app/safetreecontroller/fragments/MethaneMonitorFragment.kt b/app/src/main/java/com/casic/app/safetreecontroller/fragments/MethaneMonitorFragment.kt
index 3c0fb7f..f88cda7 100644
--- a/app/src/main/java/com/casic/app/safetreecontroller/fragments/MethaneMonitorFragment.kt
+++ b/app/src/main/java/com/casic/app/safetreecontroller/fragments/MethaneMonitorFragment.kt
@@ -155,7 +155,7 @@
 
             LocaleConstant.QUERY_METHANE_THRESHOLD_RESPONSE_CODE -> {
                 isGetThreshold = true
-                val ppm = msg.obj as Long
+                val ppm = msg.obj as Int
                 val threshold = "%.2f".format(ppm / 10000f)
                 SaveKeyValues.putValue(
                     LocaleConstant.METHANE_DEFAULT_VALUE_KEY, threshold.toFloat()
@@ -189,7 +189,7 @@
             }
 
             LocaleConstant.QUERY_METHANE_RESPONSE_CODE -> {
-                val ppm = msg.obj as Long
+                val ppm = msg.obj as Int
                 //通常，对于气体在空气中的浓度，我们可以认为100000ppm大约等于200%LEL
                 val formatValue = "%.2f".format(ppm / 500f)
                 binding.currentGasValueView.text = "当前燃气浓度：${formatValue}%LEL"