android studio - proguard.cfg file is missing

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http://stackoverflow.com – I want to minimize the size of .apk file, so I follow the Android Developer guide (http://developer.android.com/tools/help/proguard.html), but there are some problems I encountered as follows: I create a new project via Android Studio, but it doesn't generate a proguard.cfg file. And there exists a local. Properties file rather than project. Properties file. How can I figure out this issue? Thanks in advanced! (HowTos)