diff --git a/.gitignore b/.gitignore
index 11eb07f4..aca820c2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -38,3 +38,4 @@
 /*.txt
 /pic/Troubleshooting_Process.vsdx
 /pic/working_principle_en.drawio
+/app/src/test
diff --git a/app/build.gradle b/app/build.gradle
index 3b1a38f0..7e0aceea 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -39,6 +39,10 @@ android {
     buildToolsVersion build_versions.build_tools
     compileSdkVersion build_versions.target_sdk
 
+    testOptions {
+        unitTests.returnDefaultValues = true
+    }
+
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
diff --git a/app/src/main/java/com/idormy/sms/forwarder/utils/Log.kt b/app/src/main/java/com/idormy/sms/forwarder/utils/Log.kt
index b2daa222..1ad81246 100644
--- a/app/src/main/java/com/idormy/sms/forwarder/utils/Log.kt
+++ b/app/src/main/java/com/idormy/sms/forwarder/utils/Log.kt
@@ -1,6 +1,7 @@
 package com.idormy.sms.forwarder.utils
 
 import android.content.Context
+import android.os.Build
 import com.idormy.sms.forwarder.App
 import java.io.File
 import java.io.FileWriter
@@ -40,6 +41,8 @@ object Log {
     }
 
     fun logToFile(level: String, tag: String, message: String) {
+        if (Build.DEVICE == null) return
+        
         if (!::appContext.isInitialized) {
             throw IllegalStateException("Log not initialized. Call init(context) first.")
         }
diff --git a/gradle.properties b/gradle.properties
index 5b64db16..3a27ffdd 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -13,6 +13,7 @@ org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
 # org.gradle.parallel=true
 # 是否打包APK，打正式包时请设置为true,使用正式的签名
 isNeedPackage=true
+isNeedClean=false
 # 是否排除Frpc动态库，打正式包时请设置为true
 excludeFrpclib=true
 # 是否使用leakcanary检测内存泄漏，打正式包时请设置为false