One of my clients want me to program an android app which is for
internal use.
But it should be possible to rollout updates as easy as possible and
it should be as save as possible.

1. There is one obvious way:
Setting the "allow manual installation of apk-file"-checkbox. But
setting this checkbox has the downside of opening additional security
holes.
Setting this checkbox with every update (the staff has to do this) and
unsetting it afterwards is too complicated (IMO).

2. Using the Android Market as a delivery platform:
Doing something like a "Torch-App" and putting inside a semi-hidden
way of activating the rest of the application for the actual purpose.
Positive:
delivery of updates is completely free
Negative:
it could be against the license agreement (I wasn't able to find
paragraphs which are prohibiting this).
Other people can download this app.

3. Is it possible to install the APK-File manually(see number 1) and
replacing parts of the installation with an own auto-updater-app?
I already implemented similar things for Windows Mobile and Symbian.
But on this platforms it is possible to sign dlls and exe files one by
one and it is possible to directly replace files in the "application-
home" directory.

4. The most complicated way is to implement an own Appstore.
I read it several times in the past -  it is possible to implement an
own appstore on Android - but I can't find any documentation on this
topic.

Thank you in advance for helping me.

Best regards,
Thomas

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