diff --git a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/PerAppProxyActivity.kt b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/PerAppProxyActivity.kt
index d6b217e4..4b17e638 100644
--- a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/PerAppProxyActivity.kt
+++ b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/PerAppProxyActivity.kt
@@ -21,7 +21,6 @@ import com.v2ray.ang.extension.v2RayApplication
 import com.v2ray.ang.util.AppManagerUtil
 import com.v2ray.ang.util.Utils
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
 import rx.android.schedulers.AndroidSchedulers
 import rx.schedulers.Schedulers
diff --git a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/RoutingSettingsFragment.kt b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/RoutingSettingsFragment.kt
index f5a8e395..88f65d41 100644
--- a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/RoutingSettingsFragment.kt
+++ b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/RoutingSettingsFragment.kt
@@ -1,7 +1,7 @@
 package com.v2ray.ang.ui
 
 import android.Manifest
-import android.app.Activity.RESULT_OK
+import androidx.appcompat.app.AppCompatActivity.RESULT_OK
 import android.content.Intent
 import android.os.Bundle
 import android.text.TextUtils
@@ -18,7 +18,6 @@ import com.v2ray.ang.extension.toast
 import com.v2ray.ang.extension.v2RayApplication
 import com.v2ray.ang.util.Utils
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
 
 class RoutingSettingsFragment : Fragment() {
diff --git a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/ScannerActivity.kt b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/ScannerActivity.kt
index 086c39f2..6145137b 100644
--- a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/ScannerActivity.kt
+++ b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/ScannerActivity.kt
@@ -1,7 +1,7 @@
 package com.v2ray.ang.ui
 
 import android.Manifest
-import android.app.Activity
+import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
 import android.content.Intent
 import android.graphics.BitmapFactory
@@ -54,7 +54,7 @@ class ScannerActivity : BaseActivity(){
     private fun finished(text: String) {
         val intent = Intent()
         intent.putExtra("SCAN_RESULT", text)
-        setResult(Activity.RESULT_OK, intent)
+        setResult(AppCompatActivity.RESULT_OK, intent)
         finish()
     }
 
diff --git a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/TaskerActivity.kt b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/TaskerActivity.kt
index 13780757..ce38aa2f 100644
--- a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/TaskerActivity.kt
+++ b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/TaskerActivity.kt
@@ -1,6 +1,6 @@
 package com.v2ray.ang.ui
 
-import android.app.Activity
+import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
 import android.view.View
 import android.widget.ArrayAdapter
@@ -90,7 +90,7 @@ class TaskerActivity : BaseActivity() {
 
         intent.putExtra(AppConfig.TASKER_EXTRA_BUNDLE, extraBundle)
         intent.putExtra(AppConfig.TASKER_EXTRA_STRING_BLURB, blurb)
-        setResult(Activity.RESULT_OK, intent)
+        setResult(AppCompatActivity.RESULT_OK, intent)
         finish()
     }
 
diff --git a/V2rayNG/app/src/main/res/layout/item_qrcode.xml b/V2rayNG/app/src/main/res/layout/item_qrcode.xml
index 3c53162a..d5997b3f 100644
--- a/V2rayNG/app/src/main/res/layout/item_qrcode.xml
+++ b/V2rayNG/app/src/main/res/layout/item_qrcode.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:layout_gravity="center"
@@ -11,5 +12,5 @@
         android:layout_width="330dp"
         android:layout_height="330dp"
         android:scaleType="fitXY"
-        android:src="@drawable/ic_fab_check" />
+        app:srcCompat="@drawable/ic_fab_check" />
 </LinearLayout>
diff --git a/V2rayNG/app/src/main/res/layout/item_recycler_bypass_list.xml b/V2rayNG/app/src/main/res/layout/item_recycler_bypass_list.xml
index 6eb0ff19..c0909a63 100644
--- a/V2rayNG/app/src/main/res/layout/item_recycler_bypass_list.xml
+++ b/V2rayNG/app/src/main/res/layout/item_recycler_bypass_list.xml
@@ -4,7 +4,7 @@
     android:layout_height="wrap_content"
     android:gravity="center_vertical"
     android:background="@color/colorPrimary"
-    android:foreground="?android:attr/selectableItemBackground"
+    android:foreground="?attr/selectableItemBackground"
     android:clickable="true"
     android:focusable="true">
 
diff --git a/V2rayNG/app/src/main/res/layout/item_recycler_main.xml b/V2rayNG/app/src/main/res/layout/item_recycler_main.xml
index b2fbd63d..758814f0 100644
--- a/V2rayNG/app/src/main/res/layout/item_recycler_main.xml
+++ b/V2rayNG/app/src/main/res/layout/item_recycler_main.xml
@@ -20,7 +20,7 @@
             android:focusable="true"
             android:nextFocusRight="@+id/layout_share"
             android:background="@color/colorPrimary"
-            android:foreground="?android:attr/selectableItemBackground"
+            android:foreground="?attr/selectableItemBackground"
             android:layout_width="match_parent"
             android:layout_height="@dimen/server_height"
             android:layout_gravity="center"
@@ -116,7 +116,7 @@
                         android:id="@+id/layout_share"
                         android:layout_width="wrap_content"
                         android:layout_height="@dimen/server_height"
-                        android:background="?android:attr/selectableItemBackground"
+                        android:background="?attr/selectableItemBackground"
                         android:clickable="true"
                         android:focusable="true"
                         android:gravity="center"
@@ -127,7 +127,7 @@
                         <ImageView
                             android:layout_width="wrap_content"
                             android:layout_height="@dimen/png_height"
-                            android:src="@drawable/ic_share_24dp"
+                            app:srcCompat="@drawable/ic_share_24dp"
                                 app:tint="?attr/colorMainText" />
 
                     </LinearLayout>
@@ -136,7 +136,7 @@
                         android:id="@+id/layout_edit"
                         android:layout_width="wrap_content"
                         android:layout_height="@dimen/server_height"
-                        android:background="?android:attr/selectableItemBackground"
+                        android:background="?attr/selectableItemBackground"
                         android:clickable="true"
                         android:focusable="true"
                         android:gravity="center"
@@ -146,7 +146,7 @@
                         <ImageView
                             android:layout_width="@dimen/png_height"
                             android:layout_height="@dimen/png_height"
-                            android:src="@drawable/ic_edit_24dp"
+                            app:srcCompat="@drawable/ic_edit_24dp"
                                 app:tint="?attr/colorMainText" />
 
                     </LinearLayout>
@@ -155,7 +155,7 @@
                         android:id="@+id/layout_remove"
                         android:layout_width="wrap_content"
                         android:layout_height="@dimen/server_height"
-                        android:background="?android:attr/selectableItemBackground"
+                        android:background="?attr/selectableItemBackground"
                         android:clickable="true"
                         android:focusable="true"
                         android:gravity="center"
@@ -165,7 +165,7 @@
                         <ImageView
                             android:layout_width="@dimen/png_height"
                             android:layout_height="@dimen/png_height"
-                            android:src="@drawable/ic_delete_24dp"
+                            app:srcCompat="@drawable/ic_delete_24dp"
                                 app:tint="?attr/colorMainText" />
 
                     </LinearLayout>
diff --git a/V2rayNG/app/src/main/res/layout/item_recycler_sub_setting.xml b/V2rayNG/app/src/main/res/layout/item_recycler_sub_setting.xml
index d51f47db..89577e33 100644
--- a/V2rayNG/app/src/main/res/layout/item_recycler_sub_setting.xml
+++ b/V2rayNG/app/src/main/res/layout/item_recycler_sub_setting.xml
@@ -19,7 +19,7 @@
             android:clickable="true"
             android:focusable="true"
             android:background="@color/colorPrimary"
-            android:foreground="?android:attr/selectableItemBackground"
+            android:foreground="?attr/selectableItemBackground"
             android:nextFocusRight="@+id/layout_edit"
             android:layout_width="match_parent"
             android:layout_height="@dimen/server_height"
@@ -68,7 +68,7 @@
                     android:id="@+id/layout_share"
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
-                    android:background="?android:attr/selectableItemBackground"
+                    android:background="?attr/selectableItemBackground"
                     android:clickable="true"
                     android:focusable="true"
                     android:gravity="center"
@@ -79,7 +79,7 @@
                     <ImageView
                         android:layout_width="@dimen/png_height"
                         android:layout_height="@dimen/png_height"
-                        android:src="@drawable/ic_share_24dp"
+                        app:srcCompat="@drawable/ic_share_24dp"
                         app:tint="?attr/colorMainText"/>
 
                 </LinearLayout>
@@ -88,7 +88,7 @@
                     android:id="@+id/layout_edit"
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
-                    android:background="?android:attr/selectableItemBackground"
+                    android:background="?attr/selectableItemBackground"
                     android:clickable="true"
                     android:focusable="true"
                     android:gravity="center"
@@ -99,7 +99,7 @@
                     <ImageView
                         android:layout_width="@dimen/png_height"
                         android:layout_height="@dimen/png_height"
-                        android:src="@drawable/ic_edit_24dp"
+                        app:srcCompat="@drawable/ic_edit_24dp"
                         app:tint="?attr/colorMainText" />
 
                 </LinearLayout>
diff --git a/V2rayNG/app/src/main/res/layout/item_recycler_user_asset.xml b/V2rayNG/app/src/main/res/layout/item_recycler_user_asset.xml
index 7121c5fe..7ae97912 100644
--- a/V2rayNG/app/src/main/res/layout/item_recycler_user_asset.xml
+++ b/V2rayNG/app/src/main/res/layout/item_recycler_user_asset.xml
@@ -17,7 +17,7 @@
                 android:orientation="horizontal"
                 android:gravity="center"
                 android:background="@color/colorPrimary"
-                android:foreground="?android:attr/selectableItemBackground"
+                android:foreground="?attr/selectableItemBackground"
                 android:padding="@dimen/nav_header_vertical_spacing">
 
             <LinearLayout
@@ -46,7 +46,7 @@
                     android:id="@+id/layout_remove"
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
-                    android:background="?android:attr/selectableItemBackground"
+                    android:background="?attr/selectableItemBackground"
                     android:clickable="true"
                     android:focusable="true"
                     android:padding="@dimen/nav_header_vertical_spacing">
@@ -54,7 +54,7 @@
                 <ImageView
                         android:layout_width="@dimen/png_height"
                         android:layout_height="@dimen/png_height"
-                        android:src="@drawable/ic_delete_24dp"
+                        app:srcCompat="@drawable/ic_delete_24dp"
                         app:tint="?attr/colorMainText" />
             </LinearLayout>
         </LinearLayout>
diff --git a/V2rayNG/app/src/main/res/layout/widget_switch.xml b/V2rayNG/app/src/main/res/layout/widget_switch.xml
index 84d65952..4d44882e 100644
--- a/V2rayNG/app/src/main/res/layout/widget_switch.xml
+++ b/V2rayNG/app/src/main/res/layout/widget_switch.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-        android:id="@+id/layout_switch"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/layout_switch"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_gravity="center"
@@ -12,5 +13,5 @@
             android:layout_width="40dp"
             android:layout_height="40dp"
             android:padding="10dp"
-            android:src="@drawable/ic_stat_name" />
+            app:srcCompat="@drawable/ic_stat_name" />
 </LinearLayout>