Android设备如何检测已安装应用程序？

Question

I would like to install multiple versions of the same app that I am developing on my phone. However, each time a different version of the app is installed on my device (even though they have different app_names), the previously installed on is deleted.

How does my device know that the new version and the old version of the app are the same?

Answer 1

From http://developer.android.com/guide/topics/manifest/manifest-intro.html

The package name serves as a unique identifier for the application.

And later

The package name defines your application's identity, so if you change it, then it is considered to be a different application and users of the previous version cannot update to the new version.

Answer 2

它通过包名称检测更新，它搜索并获取相同的包名称并进行更新！