Am using Qt to build app on android, Qt Quick mainly its really nice, but my main problem is the start up size is around 27 MB which is huge for initial size.. is there a way to reduce this size ?
If you you don't want to use Ministro Service, you should include only the necessary Qt modules. Omitting the unnecessary modules will reduce the APK size significantly. This is a quote from BogDan Vatra the man who ported Qt to Android :
Qt files can go slightly over 40Mb/platform if you are going to use all of Qt modules. Of course your application doesnt need all the modules, so, if your application uses only Qt Quick Controls + Qt SVG + Qt Multimedia + Qt Sensors + Qt XML modules, Qt files (libs + plugins + additional files) are ~20Mb/platform and your APK will be ~10Mb.
You can see Choosing the right deploying system