- https://github.com/IngoZenz/personaldnsfilter/blob/master/app/src/main/java/dnsfilter/android/DNSFilterService.java - https://android.googlesource.com/platform/development/+/master/samples/ToyVpn/src/com/example/android/toyvpn/ToyVpnService.java - https://developer.android.com/guide/components/services#StartingAService - https://developer.android.com/guide/components/services#Foreground - https://stackoverflow.com/questions/600207/how-to-check-if-a-service-is-running-on-android - https://www.vogella.com/tutorials/AndroidServices/article.html#communication-with-services - https://github.com/googlecodelabs/bazel-android-intro/blob/master/sample/mediarecorder/java/com/example/android/mediarecorder/MainActivity.java - https://github.com/schwabe/ics-openvpn >:( - https://github.com/bazelbuild/bazel/pull/12626