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My apk file size is 2MB. First time installing the apk file in the device there is no problem.
Suppose some changes in the application after that generated the new apk file. I am try to install the new apk file in the same device then it shows some message first uninstall the previous one(i.e. , same application) in the device. But small apk files, I am not facing this problem.
Is it possible to install the new apk file without uninstall the old one?
It is not connected with apk size but with the fact that the old apk was signed with different key than the new one. So you must uninstall it before installing new application but you will have to do it only once.