问题
I have integrated Fabric in my app. When I open the project.properties file now, it says - This file is now handled by Fabric. Now I cannot see the following line anywhere in the project.properties file
proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
I am using in app billing in my app and for that I need to add
-keep class com.android.vending.billing
in the proguard-project.txt
Now I am confused as - project.properties has no line mentioning the proguard-project.txt. So will it ever be used ? If not how and where should I add the line - -keep class com.android.vending.billing
来源：https://stackoverflow.com/questions/31687308/fabric-edits-the-project-properties