[android-developers] Does the apk compiled in the old version of android src run on the newer version?

Hi Everyone,

Does the apk compiled in the old version of android src run on the
newer version?

Does google keep the api interface all the time during the update
process of android src?

I hear that a APK should be signed and then can be installed on the
specific device, is it?  Any article that introduce that?


Thanks
Max
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