diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 7c42ed5..1c0de80 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -34,42 +34,50 @@
             android:name=".CreateProfileActivity"
             android:label="@string/clash_new_profile"
             android:exported="false"
-            android:screenOrientation="portrait"/>
+            android:screenOrientation="portrait" />
         <activity
             android:name=".ImportFileActivity"
             android:label="@string/clash_import_from_file"
             android:exported="false"
-            android:screenOrientation="portrait"/>
-        <activity android:name=".ImportUrlActivity"
+            android:screenOrientation="portrait" />
+        <activity
+            android:name=".ImportUrlActivity"
             android:label="@string/clash_import_from_url"
             android:screenOrientation="portrait"
             android:exported="false" />
         <activity
             android:name=".ClashStatusActivity"
             android:exported="false"
-            android:screenOrientation="portrait"/>
-        <activity android:name=".ProxyActivity"
+            android:screenOrientation="portrait" />
+        <activity
+            android:name=".ProxyActivity"
             android:label="@string/clash_proxy_manage"
             android:exported="false"
-            android:screenOrientation="portrait"/>
-        <activity android:name=".SettingMainActivity"
+            android:screenOrientation="portrait" />
+        <activity
+            android:name=".SettingMainActivity"
             android:label="@string/application_setting_title"
             android:exported="false"
-            android:screenOrientation="portrait"/>
-        <activity android:name=".SettingProxyActivity"
+            android:screenOrientation="portrait" />
+        <activity
+            android:name=".SettingProxyActivity"
             android:label="@string/application_setting_proxy"
             android:exported="false"
-            android:screenOrientation="portrait"/>
-        <activity android:name=".SettingAccessActivity"
+            android:screenOrientation="portrait" />
+        <activity
+            android:name=".SettingAccessActivity"
             android:label="@string/proxy_setting_vpn_setting_access_control"
             android:exported="false"
-            android:screenOrientation="portrait"/>
-        <activity android:name=".SettingApplicationActivity"
+            android:screenOrientation="portrait" />
+        <activity
+            android:name=".SettingApplicationActivity"
             android:label="@string/application_setting_application"
             android:exported="false"
             android:screenOrientation="portrait" />
-        <service android:name=".ClashStartService"
-            android:exported="false"/>
+
+        <service
+            android:name=".ClashStartService"
+            android:exported="false" />
         <receiver
             android:name=".BootCompleteReceiver"
             android:exported="true"
diff --git a/app/src/main/java/com/github/kr328/clash/ClashStartService.kt b/app/src/main/java/com/github/kr328/clash/ClashStartService.kt
index f8412b6..ad1d6fb 100644
--- a/app/src/main/java/com/github/kr328/clash/ClashStartService.kt
+++ b/app/src/main/java/com/github/kr328/clash/ClashStartService.kt
@@ -24,9 +24,13 @@ class ClashStartService : Service() {
     override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
         NotificationManagerCompat.from(this).apply {
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-                createNotificationChannel(NotificationChannel(NOTIFICATION_CHANNEL_ID,
-                    getString(R.string.clash_start_service_notification_channel),
-                    NotificationManager.IMPORTANCE_DEFAULT))
+                createNotificationChannel(
+                    NotificationChannel(
+                        NOTIFICATION_CHANNEL_ID,
+                        getString(R.string.clash_start_service_notification_channel),
+                        NotificationManager.IMPORTANCE_DEFAULT
+                    )
+                )
             }
         }
 
diff --git a/app/src/main/java/com/github/kr328/clash/ImportFileActivity.kt b/app/src/main/java/com/github/kr328/clash/ImportFileActivity.kt
index a2bb2eb..3b4563a 100644
--- a/app/src/main/java/com/github/kr328/clash/ImportFileActivity.kt
+++ b/app/src/main/java/com/github/kr328/clash/ImportFileActivity.kt
@@ -18,12 +18,16 @@ import kotlin.concurrent.thread
 
 class ImportFileActivity : BaseActivity() {
     private val elements: List<FormAdapter.Type> = listOf(
-        FormAdapter.TextType(R.drawable.ic_about,
+        FormAdapter.TextType(
+            R.drawable.ic_about,
             R.string.clash_profile_name,
-            R.string.clash_profile_name_hint),
-        FormAdapter.FilePickerType(R.drawable.ic_new_profile_file,
+            R.string.clash_profile_name_hint
+        ),
+        FormAdapter.FilePickerType(
+            R.drawable.ic_new_profile_file,
             R.string.clash_profile_file,
-            R.string.clash_profile_file_hint)
+            R.string.clash_profile_file_hint
+        )
     )
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -48,7 +52,12 @@ class ImportFileActivity : BaseActivity() {
     }
 
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
-        if (data != null && (activity_import_file_form.adapter as FormAdapter).onActivityResult(requestCode, resultCode, data) )
+        if (data != null && (activity_import_file_form.adapter as FormAdapter).onActivityResult(
+                requestCode,
+                resultCode,
+                data
+            )
+        )
             return
 
         super.onActivityResult(requestCode, resultCode, data)
@@ -59,20 +68,28 @@ class ImportFileActivity : BaseActivity() {
             val name = elements[0] as FormAdapter.TextType
             val file = elements[1] as FormAdapter.FilePickerType
 
-            if ( name.content.isEmpty() ) {
+            if (name.content.isEmpty()) {
                 runOnUiThread {
                     activity_import_file_save.visibility = View.VISIBLE
                     activity_import_file_saving.visibility = View.GONE
-                    Snackbar.make(activity_import_file_root, R.string.clash_import_file_empty_name, Snackbar.LENGTH_LONG).show()
+                    Snackbar.make(
+                        activity_import_file_root,
+                        R.string.clash_import_file_empty_name,
+                        Snackbar.LENGTH_LONG
+                    ).show()
                 }
                 return
             }
 
-            if ( file.content == null || file.content == Uri.EMPTY ) {
+            if (file.content == null || file.content == Uri.EMPTY) {
                 runOnUiThread {
                     activity_import_file_save.visibility = View.VISIBLE
                     activity_import_file_saving.visibility = View.GONE
-                    Snackbar.make(activity_import_file_root, R.string.clash_import_file_empty_path, Snackbar.LENGTH_LONG).show()
+                    Snackbar.make(
+                        activity_import_file_root,
+                        R.string.clash_import_file_empty_path,
+                        Snackbar.LENGTH_LONG
+                    ).show()
                 }
                 return
             }
diff --git a/app/src/main/java/com/github/kr328/clash/ImportUrlActivity.kt b/app/src/main/java/com/github/kr328/clash/ImportUrlActivity.kt
index 75ef8dd..07e8d00 100644
--- a/app/src/main/java/com/github/kr328/clash/ImportUrlActivity.kt
+++ b/app/src/main/java/com/github/kr328/clash/ImportUrlActivity.kt
@@ -11,7 +11,8 @@ class ImportUrlActivity : BaseActivity() {
         FormAdapter.TextType(
             R.drawable.ic_about,
             R.string.clash_profile_name,
-            R.string.clash_profile_name_hint),
+            R.string.clash_profile_name_hint
+        ),
         FormAdapter.TextType(
             R.drawable.ic_link,
             R.string.clash_profile_url,
@@ -33,7 +34,8 @@ class ImportUrlActivity : BaseActivity() {
 
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
         if (data != null && (activity_import_url_form.adapter as FormAdapter)
-                .onActivityResult(requestCode, resultCode, data))
+                .onActivityResult(requestCode, resultCode, data)
+        )
             return
 
         super.onActivityResult(requestCode, resultCode, data)
diff --git a/app/src/main/java/com/github/kr328/clash/adapter/FormAdapter.kt b/app/src/main/java/com/github/kr328/clash/adapter/FormAdapter.kt
index d0891d5..73f7288 100644
--- a/app/src/main/java/com/github/kr328/clash/adapter/FormAdapter.kt
+++ b/app/src/main/java/com/github/kr328/clash/adapter/FormAdapter.kt
@@ -7,7 +7,6 @@ import android.net.Uri
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.webkit.MimeTypeMap
 import android.widget.EditText
 import android.widget.ImageView
 import android.widget.TextView
diff --git a/app/src/main/java/com/github/kr328/clash/utils/FileUtils.kt b/app/src/main/java/com/github/kr328/clash/utils/FileUtils.kt
index 70caeff..3585b11 100644
--- a/app/src/main/java/com/github/kr328/clash/utils/FileUtils.kt
+++ b/app/src/main/java/com/github/kr328/clash/utils/FileUtils.kt
@@ -2,6 +2,7 @@ package com.github.kr328.clash.utils
 
 import java.io.File
 import java.security.SecureRandom
+import kotlin.math.absoluteValue
 
 object FileUtils {
     private val random = SecureRandom()
@@ -12,7 +13,7 @@ object FileUtils {
         var file: File
 
         do {
-            file = dir.resolve(random.nextLong().toString() + suffix)
+            file = dir.resolve(random.nextLong().absoluteValue.toString() + suffix)
         } while (file.exists())
 
         return file
diff --git a/app/src/main/res/drawable/ic_link.xml b/app/src/main/res/drawable/ic_link.xml
index 538c5bd..c9698ed 100644
--- a/app/src/main/res/drawable/ic_link.xml
+++ b/app/src/main/res/drawable/ic_link.xml
@@ -1,9 +1,9 @@
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
-        android:width="24dp"
-        android:height="24dp"
-        android:viewportWidth="24.0"
-        android:viewportHeight="24.0">
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24.0"
+    android:viewportHeight="24.0">
     <path
         android:fillColor="#FF000000"
-        android:pathData="M3.9,12c0,-1.71 1.39,-3.1 3.1,-3.1h4L11,7L7,7c-2.76,0 -5,2.24 -5,5s2.24,5 5,5h4v-1.9L7,15.1c-1.71,0 -3.1,-1.39 -3.1,-3.1zM8,13h8v-2L8,11v2zM17,7h-4v1.9h4c1.71,0 3.1,1.39 3.1,3.1s-1.39,3.1 -3.1,3.1h-4L13,17h4c2.76,0 5,-2.24 5,-5s-2.24,-5 -5,-5z"/>
+        android:pathData="M3.9,12c0,-1.71 1.39,-3.1 3.1,-3.1h4L11,7L7,7c-2.76,0 -5,2.24 -5,5s2.24,5 5,5h4v-1.9L7,15.1c-1.71,0 -3.1,-1.39 -3.1,-3.1zM8,13h8v-2L8,11v2zM17,7h-4v1.9h4c1.71,0 3.1,1.39 3.1,3.1s-1.39,3.1 -3.1,3.1h-4L13,17h4c2.76,0 5,-2.24 5,-5s-2.24,-5 -5,-5z" />
 </vector>