Do not make the same two app package name
The same two app package name
android system to distinguish between the same app package name is based on the program, if two app's built the same package name, the system will think it's the same app, if installed in the same package name again under the existing equipment in the app will think is an updated version, will be reinstalled (of course, must be consistent with requirements of the signature, otherwise it will prompt signature collision), the android promote the use of the company's domain name as a prefix to the name of the package, because the domain name is the only identification app is avoided conflict, so if you are referring to the same app package name is the same, then it can not be installed at the same time, there would be no use to say this.
2, package names are different, but the same function.
This situation is possible, you can put the same app decompile, modify the package name, and then recompile, you can achieve the installation starts, it means deceiving android system itself. Or you can make a program (also online), in fact the same principle, but is automatically modified application package name only, when an existing app installed again modify the internal package name in code.
Scenario 1: You have released the application A, package named "A", published successfully,
To apply the update, just a package named "A", you can replace the original App, achieved with the new.
Scenario 2: You have released the application A, package named "A", published successfully,
It has released an identical application A, package named "B", found in the phone, I X, 2 applications A, (the user will certainly have to call you).
Note: When there when the business needs to modify the package name, this name have to be changed (package = "com.example.cancelwang").
