Question

Here is the context. I want to have a free version and a premium version of the same application. When people buy the application, I want them to be able to "upgrade" without losing their data, i.e. the premium version should install over the free version. I want to use the same code base and just switch a setting to build the premium version. Andoid Market does not let me convert a free app to a paid app, so the trivial option is not available.

如果有人成功尝试,我就感到奇怪。安第斯市场如何确定一项申请——它是否认为溢价是一种不同的工具,只是同时安装?

Answer 1

答案是:这不能与安伯市场相隔,因为市场不允许上载两只带有相同名称的仪器。不能将安乐器trick成在免费版本上安装溢价,并将其作为升级处理。

良好的新闻:增加数据库备份/备用功能(将数据库复制到SD卡,并反馈到复印机)只需要几条代码。我的用户必须同时安装两种版本,从免费版本中支持数据库,并将数据库恢复至溢价版。

Answer 2

数据库不支持SD卡(根据@cdonner的建议),后者需要<代码>。 EPAITE_EXTERNAL_STORAGE granted, the free app can exposure a ContentProvider, which the paid app can use to transfer data.

保证,以确保其内容。

Answer 3

我的想法如下:

Paid version s android:versionCode should be free s android:versionCode +1
Both should have the same package.

When paid version is installed, it will replace the free one. Actually it will update it, since it has a higher android:versionCode.

由于两者都有相同的一揽子计划,它们将放在同一个文件夹上(/data/your. Pack<>/code>),因此,有价的电器将能够免费查阅。

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