NetCheck for Android
(c) V. Subhash, 2017.
http://www.vsubhash.com
Released as public-domain source code
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This Android app plays audio ring tones as notifications whenever the Internet connection drops. It detects the connection status by pinging a high-traffic high-availability website at regular intervals.

To build the app, execute the following command to download the source code.

  git clone https://github.com/vsubhash/netcheck-android.git
  
To install the app, either use Android SDK or copy the NetCheck.apk to the memory card or the internal storage of your Android phone and launch the file. You may have to enable installation from "Settings - Apps - Unknown Sources". Remember to disable the setting after installation.