APPlication that will apply my font style into the message typing of other application such as Viber, What'sup Skype, etc....change fonts + NO ROOTING

Android has only one font style call it font A. If you do not think of a way to install/change fonts without root, please do no bid for this job. user would be able to identify the font style#B without the need of rooting, rebooting or with a launcher. FIND a different solution out-of-the-box if you are capable of finding it. this font style#B will be available in all alphabets. font style#B would be slightly different that the Android font#A in order for user to differentiate between the 2 fonts at a glance of an eye. This APP stays in the background and will override one or multiple other text messaging applications. You need to implement web NGNIX server for supplying data to the app. coder need to know ruby on rails. Because for the internal android security max manufacturers don't allow users to customize the system apps. You need to find an innovative solution that will bypass this hurdle. supports 30+ languages: English, Chinese 2, Russian, Japanese, Korea, French, Spanish, German, Italian, Czech, Hungarian, Ukrainian, Tamil, Catalan, Turkish, Lithuanian, Portuguese...