I have created a Trip Planner app for Android phones. This was based on an open source OTP project that I was able to modify and customized to run against my trip planner. Â It costs nothing and has no ads. Please give it a try an let me know if you like it! It is available in the Google Play store under the name BJCTA Trip Planner.
You can learn more about it from the link below.
https://play.google.com/store/apps/details?id=net.line72.bjcta.opentripplanner.android
You can also grab the source code and submit patches from my github site: