Netty 4.0频道本地(Netty 4.0 Channel Local)

 您可以免费获得付费应用 
 
Is there a specific process for accomplishing this?
 
 不，他们没有正式的方法来执行此操作，因为在应用程序中，您必须将Google Play及其节目中的项目添加到他/她为该应用程序内项目支付的每个用户。 
 
 但你可以按自己的方式处理。 
 
 就像用户已经付费一样，你必须隐藏针对该特定用户的应用内（或任何你的应用流），并为他们启用未来。 所以不需要为此付出同样的代价 
 
 在排序中，您可以通过JAVA代码处理（因为您有付费用户列表） 
 
 如果app具有相同的包并且当前版本是新的，则安装然后更新应用程序（确保两个版本都使用相同的证书/密钥库签名） 
 
 重要提示：如果您将应用程序从付费更改为免费并保存更改，则更改是永久性的。 更改为免费后，该应用无法更改回付费应用。 如果您想再次为已更改为免费应用的付费应用付费，则需要创建一个包含新软件包名称的新应用，并为新应用设置价格。 
 
 Android开发人员帮助 

You can make a paid app be free
 
Is there a specific process for accomplishing this?
 
No, their is no official way to do this, Because In-App you have to add items on google play and its show to every user util he/she pay for that In-App Item.
 
but you can handle by your own way.
 
Like if user already pay then you have to hide in-app(or whatever your app flow) for that perticular user and enable that future for them. So no need to pay again for same
 
in sort you can handle by JAVA code(because you have list of paid user)
 
If app have same package and current version is new then installed then its update app(make sure both version are signed with same certificate/keystore)
 
Important: If you change an app from Paid to Free and save the change, the change is permanent. Once changed to free, the app can't be changed back to a paid app. If you want to charge again for a paid app that you’ve changed to a free app, you would need to create a new app with a new package name and set a price for the new app.
 
Android Developer Help