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I use Qt5.2 + QtCreator3.0, and when I build my project, "android-build" directory clearing every time... So, I can't modify the generated Java-code. May be, I need to make some settings for QtCreator?
What you need is to put your java code (with everything else that need to go inside "android-build") into a directory and specify into the .pro:
ANDROID_PACKAGE_SOURCE_DIR = $$PWD/Android_Source