diff --git a/build.sbt b/build.sbt
index 0bb7fbf5..aae17695 100644
--- a/build.sbt
+++ b/build.sbt
@@ -20,10 +20,10 @@ proguardVersion := "5.3.1"
 proguardCache := Seq()
 proguardOptions ++=
   "-keep class com.github.shadowsocks.System { *; }" ::
-    "-dontwarn com.google.android.gms.internal.**" ::
-    "-dontwarn com.j256.ormlite.**" ::
-    "-dontwarn org.xbill.**" ::
-    Nil
+  "-dontwarn com.google.android.gms.internal.**" ::
+  "-dontwarn com.j256.ormlite.**" ::
+  "-dontwarn org.xbill.**" ::
+  Nil
 
 shrinkResources := true
 typedResources := false
diff --git a/lint.xml b/lint.xml
new file mode 100644
index 00000000..cb6d4839
--- /dev/null
+++ b/lint.xml
@@ -0,0 +1,3 @@
+<issue id="NewApi">
+  <ignore path="src/main/res/drawable"/>
+</issue>
diff --git a/src/main/res/drawable/ic_arrow_drop_down.xml b/src/main/res/drawable/ic_arrow_drop_down.xml
index 10c32e72..f93ac49f 100644
--- a/src/main/res/drawable/ic_arrow_drop_down.xml
+++ b/src/main/res/drawable/ic_arrow_drop_down.xml
@@ -1,4 +1,3 @@
-<!--suppress NewApi -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="24dp"
     android:height="24dp"
diff --git a/src/main/res/drawable/ic_content_add.xml b/src/main/res/drawable/ic_content_add.xml
index dd8a0dd0..b9b8eca8 100644
--- a/src/main/res/drawable/ic_content_add.xml
+++ b/src/main/res/drawable/ic_content_add.xml
@@ -1,4 +1,3 @@
-<!--suppress NewApi -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
         android:width="24dp"
         android:height="24dp"
diff --git a/src/main/res/drawable/ic_content_copy.xml b/src/main/res/drawable/ic_content_copy.xml
index ae1540bb..e50927b2 100644
--- a/src/main/res/drawable/ic_content_copy.xml
+++ b/src/main/res/drawable/ic_content_copy.xml
@@ -1,4 +1,3 @@
-<!--suppress NewApi -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
         android:width="24dp"
         android:height="24dp"
diff --git a/src/main/res/drawable/ic_content_create.xml b/src/main/res/drawable/ic_content_create.xml
index 72237acb..35a774a5 100644
--- a/src/main/res/drawable/ic_content_create.xml
+++ b/src/main/res/drawable/ic_content_create.xml
@@ -1,4 +1,3 @@
-<!--suppress NewApi -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
         android:width="24dp"
         android:height="24dp"
diff --git a/src/main/res/drawable/ic_content_paste.xml b/src/main/res/drawable/ic_content_paste.xml
index d7ee9633..7d2f624c 100644
--- a/src/main/res/drawable/ic_content_paste.xml
+++ b/src/main/res/drawable/ic_content_paste.xml
@@ -1,4 +1,3 @@
-<!--suppress NewApi -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
         android:width="24dp"
         android:height="24dp"
diff --git a/src/main/res/drawable/ic_device_nfc.xml b/src/main/res/drawable/ic_device_nfc.xml
index b702301d..1dccf932 100644
--- a/src/main/res/drawable/ic_device_nfc.xml
+++ b/src/main/res/drawable/ic_device_nfc.xml
@@ -1,4 +1,3 @@
-<!--suppress NewApi -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
         android:width="24dp"
         android:height="24dp"
diff --git a/src/main/res/drawable/ic_image_camera_alt.xml b/src/main/res/drawable/ic_image_camera_alt.xml
index 59012e9f..4fa7158a 100644
--- a/src/main/res/drawable/ic_image_camera_alt.xml
+++ b/src/main/res/drawable/ic_image_camera_alt.xml
@@ -1,4 +1,3 @@
-<!--suppress NewApi -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
         android:width="24dp"
         android:height="24dp"
diff --git a/src/main/res/drawable/ic_social_share.xml b/src/main/res/drawable/ic_social_share.xml
index f9d9c5bb..e3fe874d 100644
--- a/src/main/res/drawable/ic_social_share.xml
+++ b/src/main/res/drawable/ic_social_share.xml
@@ -1,4 +1,3 @@
-<!--suppress NewApi -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
         android:width="24dp"
         android:height="24dp"
diff --git a/src/main/res/drawable/ic_start_busy.xml b/src/main/res/drawable/ic_start_busy.xml
index 89504f7b..f0154c37 100755
--- a/src/main/res/drawable/ic_start_busy.xml
+++ b/src/main/res/drawable/ic_start_busy.xml
@@ -1,5 +1,3 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--suppress NewApi -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="24dp"
     android:height="24dp"
diff --git a/src/main/res/drawable/ic_start_connected.xml b/src/main/res/drawable/ic_start_connected.xml
index a1c86a1a..bc8c3664 100755
--- a/src/main/res/drawable/ic_start_connected.xml
+++ b/src/main/res/drawable/ic_start_connected.xml
@@ -1,5 +1,3 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--suppress NewApi -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="24dp"
     android:height="24dp"
diff --git a/src/main/res/drawable/ic_start_idle.xml b/src/main/res/drawable/ic_start_idle.xml
index 0f430236..ef9b99d3 100755
--- a/src/main/res/drawable/ic_start_idle.xml
+++ b/src/main/res/drawable/ic_start_idle.xml
@@ -1,5 +1,3 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--suppress NewApi -->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="24dp"
     android:height="24dp"