Dia dhuibh,
you can how get predictive texting for Android Phones in Gaeilge, Gàidhlig and Gaelg. You need to go to the Google Play store and download “adaptxt”. Once the app is installed, you can choose which languages you are using.
After choosing and installing your language packs, you need to hit the back button and then follow the installation procedure.
If your phone insists on using the old screen keyboard (input method), you can long-click on any text input field and choose.
Interview (as Gaeilge) with Dr. Kevin Scannell:
http://otv.gaelsceal.ie/display/449
Screenshots of the installation procedure (Explanations are in Scottish Gaelic, but you might still find them useful): http://www.foramnagaidhlig.net/foram/viewtopic.php?f=28&t=2437