Modify background color

V2rayNG/app/src/main/res/layout/activity_main.xml

@@ -48,7 +48,7 @@
                         android:id="@+id/layout_test"
                         android:layout_width="match_parent"
                         android:layout_height="@dimen/connection_test_height"
-                        android:background="?attr/colorPrimary"
+                        android:background="@color/colorMainTestBg"
                         android:gravity="center|start"
                         android:nextFocusRight="@+id/fab"
                         android:clickable="true"

V2rayNG/app/src/main/res/values-night/colors.xml

@@ -11,4 +11,5 @@
     <color name="colorAccent">#FFFFFF</color>
     <color name="colorBg">#000000</color>
     <color name="colorText">#FFFFFF</color>
+    <color name="colorMainTestBg">#222222</color>
 </resources>

V2rayNG/app/src/main/res/values/colors.xml

@@ -15,4 +15,5 @@
     <color name="colorAccent">#000000</color>
     <color name="colorBg">#FFFFFF</color>
     <color name="colorText">#000000</color>
+    <color name="colorMainTestBg">#F0F1F6</color>
 </resources>