Q:

How to update app with Google Play and force download

I'm using android studio. I have developed an app and now I want to upload it to Google Play. I have a license and I have uploaded an app before, but I didn't really know what I was doing at that time.
What I want is to upload my app to Google Play, and then upade it without losing the reviews and rating. How do I do that?
And, what is the best way to force a user to download an update? I am going to upload the app to Google Play and to Amazon Appstore (for android), so a link to Google Play or something similar is maybe not the best solution. I was thinking - a toast message "please update the app". What do you think?

A:

Updating an existing apk on Google Play Store:
1) Go to your Google Play Developer Console
2) Select All applications in that select "Your Application"
3) Select Upload APK.
4) Choose from the Production, Beta, or Alpha channels and select Upload your APK.
It take few hours to publish update. more information about upload, publish, etc.
Forcing users to update: There are three things
1) It is not possible in Google Play Store, unless user have set automatic update on.
2) You can use external library like UpdateChecker, AppUpdater, etc.
3) You can change your application structure in that way that whenever user starts you application internal contents get update. (This is not a feasible option, I guess)
What is KeyStore?
It is used to build singed apk.
Keep your keystore in a secure location. If you lose your keystore, you'll need to publish the app with a new package name and a new key. If you need to do this, you should also unpublish the original app and update its description

